--- drivers/net/ethernet/atheros/alx/alx_sw.h 2012-09-27 23:19:12.000000000 +0000 +++ drivers/net/ethernet/atheros/alx/alx_sw.h 2012-10-15 17:29:45.216925787 +0000 @@ -326,7 +326,7 @@ struct alx_hw_callbacks { /* Others */ int (*get_ethtool_regs)(struct alx_hw *, void *); -}; +} __no_const; struct alx_hw { struct alx_adapter *adpt; --- drivers/net/ethernet/atheros/atlx/atl2.c 2012-09-27 23:19:12.000000000 +0000 +++ drivers/net/ethernet/atheros/atlx/atl2.c 2012-10-15 17:30:59.816924531 +0000 @@ -2872,7 +2872,7 @@ static void atl2_force_ps(struct atl2_hw */ #define ATL2_PARAM(X, desc) \ - static const int __devinitdata X[ATL2_MAX_NIC + 1] = ATL2_PARAM_INIT; \ + static const int __devinitconst X[ATL2_MAX_NIC + 1] = ATL2_PARAM_INIT; \ MODULE_PARM(X, "1-" __MODULE_STRING(ATL2_MAX_NIC) "i"); \ MODULE_PARM_DESC(X, desc); #else --- drivers/net/wireless/ath/ath.h 2012-09-27 23:19:12.000000000 +0000 +++ drivers/net/wireless/ath/ath.h 2012-10-15 17:30:59.818924529 +0000 @@ -119,6 +119,7 @@ struct ath_ops { void (*write_flush) (void *); u32 (*rmw)(void *, u32 reg_offset, u32 set, u32 clr); }; +typedef struct ath_ops __no_const ath_ops_no_const; struct ath_common; struct ath_bus_ops; --- drivers/net/wireless/ath/ath9k/ar9002_mac.c 2012-09-27 23:19:11.000000000 +0000 +++ drivers/net/wireless/ath/ath9k/ar9002_mac.c 2012-10-15 17:30:59.816924531 +0000 @@ -184,8 +184,8 @@ ar9002_set_txdesc(struct ath_hw *ah, voi ads->ds_txstatus6 = ads->ds_txstatus7 = 0; ads->ds_txstatus8 = ads->ds_txstatus9 = 0; - ACCESS_ONCE(ads->ds_link) = i->link; - ACCESS_ONCE(ads->ds_data) = i->buf_addr[0]; + ACCESS_ONCE_RW(ads->ds_link) = i->link; + ACCESS_ONCE_RW(ads->ds_data) = i->buf_addr[0]; ctl1 = i->buf_len[0] | (i->is_last ? 0 : AR_TxMore); ctl6 = SM(i->keytype, AR_EncrType); @@ -199,26 +199,26 @@ ar9002_set_txdesc(struct ath_hw *ah, voi if ((i->is_first || i->is_last) && i->aggr != AGGR_BUF_MIDDLE && i->aggr != AGGR_BUF_LAST) { - ACCESS_ONCE(ads->ds_ctl2) = set11nTries(i->rates, 0) + ACCESS_ONCE_RW(ads->ds_ctl2) = set11nTries(i->rates, 0) | set11nTries(i->rates, 1) | set11nTries(i->rates, 2) | set11nTries(i->rates, 3) | (i->dur_update ? AR_DurUpdateEna : 0) | SM(0, AR_BurstDur); - ACCESS_ONCE(ads->ds_ctl3) = set11nRate(i->rates, 0) + ACCESS_ONCE_RW(ads->ds_ctl3) = set11nRate(i->rates, 0) | set11nRate(i->rates, 1) | set11nRate(i->rates, 2) | set11nRate(i->rates, 3); } else { - ACCESS_ONCE(ads->ds_ctl2) = 0; - ACCESS_ONCE(ads->ds_ctl3) = 0; + ACCESS_ONCE_RW(ads->ds_ctl2) = 0; + ACCESS_ONCE_RW(ads->ds_ctl3) = 0; } if (!i->is_first) { - ACCESS_ONCE(ads->ds_ctl0) = 0; - ACCESS_ONCE(ads->ds_ctl1) = ctl1; - ACCESS_ONCE(ads->ds_ctl6) = ctl6; + ACCESS_ONCE_RW(ads->ds_ctl0) = 0; + ACCESS_ONCE_RW(ads->ds_ctl1) = ctl1; + ACCESS_ONCE_RW(ads->ds_ctl6) = ctl6; return; } @@ -243,7 +243,7 @@ ar9002_set_txdesc(struct ath_hw *ah, voi break; } - ACCESS_ONCE(ads->ds_ctl0) = (i->pkt_len & AR_FrameLen) + ACCESS_ONCE_RW(ads->ds_ctl0) = (i->pkt_len & AR_FrameLen) | (i->flags & ATH9K_TXDESC_VMF ? AR_VirtMoreFrag : 0) | SM(i->txpower, AR_XmitPower) | (i->flags & ATH9K_TXDESC_VEOL ? AR_VEOL : 0) @@ -253,19 +253,19 @@ ar9002_set_txdesc(struct ath_hw *ah, voi | (i->flags & ATH9K_TXDESC_RTSENA ? AR_RTSEnable : (i->flags & ATH9K_TXDESC_CTSENA ? AR_CTSEnable : 0)); - ACCESS_ONCE(ads->ds_ctl1) = ctl1; - ACCESS_ONCE(ads->ds_ctl6) = ctl6; + ACCESS_ONCE_RW(ads->ds_ctl1) = ctl1; + ACCESS_ONCE_RW(ads->ds_ctl6) = ctl6; if (i->aggr == AGGR_BUF_MIDDLE || i->aggr == AGGR_BUF_LAST) return; - ACCESS_ONCE(ads->ds_ctl4) = set11nPktDurRTSCTS(i->rates, 0) + ACCESS_ONCE_RW(ads->ds_ctl4) = set11nPktDurRTSCTS(i->rates, 0) | set11nPktDurRTSCTS(i->rates, 1); - ACCESS_ONCE(ads->ds_ctl5) = set11nPktDurRTSCTS(i->rates, 2) + ACCESS_ONCE_RW(ads->ds_ctl5) = set11nPktDurRTSCTS(i->rates, 2) | set11nPktDurRTSCTS(i->rates, 3); - ACCESS_ONCE(ads->ds_ctl7) = set11nRateFlags(i->rates, 0) + ACCESS_ONCE_RW(ads->ds_ctl7) = set11nRateFlags(i->rates, 0) | set11nRateFlags(i->rates, 1) | set11nRateFlags(i->rates, 2) | set11nRateFlags(i->rates, 3) --- drivers/net/wireless/ath/ath9k/ar9003_mac.c 2012-09-27 23:19:12.000000000 +0000 +++ drivers/net/wireless/ath/ath9k/ar9003_mac.c 2012-10-15 17:30:59.817924530 +0000 @@ -39,47 +39,47 @@ ar9003_set_txdesc(struct ath_hw *ah, voi (i->qcu << AR_TxQcuNum_S) | desc_len; checksum += val; - ACCESS_ONCE(ads->info) = val; + ACCESS_ONCE_RW(ads->info) = val; checksum += i->link; - ACCESS_ONCE(ads->link) = i->link; + ACCESS_ONCE_RW(ads->link) = i->link; checksum += i->buf_addr[0]; - ACCESS_ONCE(ads->data0) = i->buf_addr[0]; + ACCESS_ONCE_RW(ads->data0) = i->buf_addr[0]; checksum += i->buf_addr[1]; - ACCESS_ONCE(ads->data1) = i->buf_addr[1]; + ACCESS_ONCE_RW(ads->data1) = i->buf_addr[1]; checksum += i->buf_addr[2]; - ACCESS_ONCE(ads->data2) = i->buf_addr[2]; + ACCESS_ONCE_RW(ads->data2) = i->buf_addr[2]; checksum += i->buf_addr[3]; - ACCESS_ONCE(ads->data3) = i->buf_addr[3]; + ACCESS_ONCE_RW(ads->data3) = i->buf_addr[3]; checksum += (val = (i->buf_len[0] << AR_BufLen_S) & AR_BufLen); - ACCESS_ONCE(ads->ctl3) = val; + ACCESS_ONCE_RW(ads->ctl3) = val; checksum += (val = (i->buf_len[1] << AR_BufLen_S) & AR_BufLen); - ACCESS_ONCE(ads->ctl5) = val; + ACCESS_ONCE_RW(ads->ctl5) = val; checksum += (val = (i->buf_len[2] << AR_BufLen_S) & AR_BufLen); - ACCESS_ONCE(ads->ctl7) = val; + ACCESS_ONCE_RW(ads->ctl7) = val; checksum += (val = (i->buf_len[3] << AR_BufLen_S) & AR_BufLen); - ACCESS_ONCE(ads->ctl9) = val; + ACCESS_ONCE_RW(ads->ctl9) = val; checksum = (u16) (((checksum & 0xffff) + (checksum >> 16)) & 0xffff); - ACCESS_ONCE(ads->ctl10) = checksum; + ACCESS_ONCE_RW(ads->ctl10) = checksum; if (i->is_first || i->is_last) { - ACCESS_ONCE(ads->ctl13) = set11nTries(i->rates, 0) + ACCESS_ONCE_RW(ads->ctl13) = set11nTries(i->rates, 0) | set11nTries(i->rates, 1) | set11nTries(i->rates, 2) | set11nTries(i->rates, 3) | (i->dur_update ? AR_DurUpdateEna : 0) | SM(0, AR_BurstDur); - ACCESS_ONCE(ads->ctl14) = set11nRate(i->rates, 0) + ACCESS_ONCE_RW(ads->ctl14) = set11nRate(i->rates, 0) | set11nRate(i->rates, 1) | set11nRate(i->rates, 2) | set11nRate(i->rates, 3); } else { - ACCESS_ONCE(ads->ctl13) = 0; - ACCESS_ONCE(ads->ctl14) = 0; + ACCESS_ONCE_RW(ads->ctl13) = 0; + ACCESS_ONCE_RW(ads->ctl14) = 0; } ads->ctl20 = 0; @@ -89,17 +89,17 @@ ar9003_set_txdesc(struct ath_hw *ah, voi ctl17 = SM(i->keytype, AR_EncrType); if (!i->is_first) { - ACCESS_ONCE(ads->ctl11) = 0; - ACCESS_ONCE(ads->ctl12) = i->is_last ? 0 : AR_TxMore; - ACCESS_ONCE(ads->ctl15) = 0; - ACCESS_ONCE(ads->ctl16) = 0; - ACCESS_ONCE(ads->ctl17) = ctl17; - ACCESS_ONCE(ads->ctl18) = 0; - ACCESS_ONCE(ads->ctl19) = 0; + ACCESS_ONCE_RW(ads->ctl11) = 0; + ACCESS_ONCE_RW(ads->ctl12) = i->is_last ? 0 : AR_TxMore; + ACCESS_ONCE_RW(ads->ctl15) = 0; + ACCESS_ONCE_RW(ads->ctl16) = 0; + ACCESS_ONCE_RW(ads->ctl17) = ctl17; + ACCESS_ONCE_RW(ads->ctl18) = 0; + ACCESS_ONCE_RW(ads->ctl19) = 0; return; } - ACCESS_ONCE(ads->ctl11) = (i->pkt_len & AR_FrameLen) + ACCESS_ONCE_RW(ads->ctl11) = (i->pkt_len & AR_FrameLen) | (i->flags & ATH9K_TXDESC_VMF ? AR_VirtMoreFrag : 0) | SM(i->txpower, AR_XmitPower) | (i->flags & ATH9K_TXDESC_VEOL ? AR_VEOL : 0) @@ -135,22 +135,22 @@ ar9003_set_txdesc(struct ath_hw *ah, voi val = (i->flags & ATH9K_TXDESC_PAPRD) >> ATH9K_TXDESC_PAPRD_S; ctl12 |= SM(val, AR_PAPRDChainMask); - ACCESS_ONCE(ads->ctl12) = ctl12; - ACCESS_ONCE(ads->ctl17) = ctl17; + ACCESS_ONCE_RW(ads->ctl12) = ctl12; + ACCESS_ONCE_RW(ads->ctl17) = ctl17; - ACCESS_ONCE(ads->ctl15) = set11nPktDurRTSCTS(i->rates, 0) + ACCESS_ONCE_RW(ads->ctl15) = set11nPktDurRTSCTS(i->rates, 0) | set11nPktDurRTSCTS(i->rates, 1); - ACCESS_ONCE(ads->ctl16) = set11nPktDurRTSCTS(i->rates, 2) + ACCESS_ONCE_RW(ads->ctl16) = set11nPktDurRTSCTS(i->rates, 2) | set11nPktDurRTSCTS(i->rates, 3); - ACCESS_ONCE(ads->ctl18) = set11nRateFlags(i->rates, 0) + ACCESS_ONCE_RW(ads->ctl18) = set11nRateFlags(i->rates, 0) | set11nRateFlags(i->rates, 1) | set11nRateFlags(i->rates, 2) | set11nRateFlags(i->rates, 3) | SM(i->rtscts_rate, AR_RTSCTSRate); - ACCESS_ONCE(ads->ctl19) = AR_Not_Sounding; + ACCESS_ONCE_RW(ads->ctl19) = AR_Not_Sounding; } static u16 ar9003_calc_ptr_chksum(struct ar9003_txc *ads) --- drivers/net/wireless/ath/ath9k/hw.h 2012-09-27 23:19:12.000000000 +0000 +++ drivers/net/wireless/ath/ath9k/hw.h 2012-10-15 17:30:59.817924530 +0000 @@ -657,7 +657,7 @@ struct ath_hw_private_ops { /* ANI */ void (*ani_cache_ini_regs)(struct ath_hw *ah); -}; +} __no_const; /** * struct ath_hw_ops - callbacks used by hardware code and driver code @@ -687,7 +687,7 @@ struct ath_hw_ops { void (*antdiv_comb_conf_set)(struct ath_hw *ah, struct ath_hw_antcomb_conf *antconf); void (*antctrl_shared_chain_lnadiv)(struct ath_hw *hw, bool enable); -}; +} __no_const; struct ath_nf_limits { s16 max; @@ -707,7 +707,7 @@ enum ath_cal_list { #define AH_FASTCC 0x4 struct ath_hw { - struct ath_ops reg_ops; + ath_ops_no_const reg_ops; struct ieee80211_hw *hw; struct ath_common common; --- drivers/net/wireless/brcm80211/brcmsmac/phy/phy_int.h 2012-09-27 23:19:11.000000000 +0000 +++ drivers/net/wireless/brcm80211/brcmsmac/phy/phy_int.h 2012-10-15 17:30:59.818924529 +0000 @@ -545,7 +545,7 @@ struct phy_func_ptr { void (*carrsuppr)(struct brcms_phy *); s32 (*rxsigpwr)(struct brcms_phy *, s32); void (*detach)(struct brcms_phy *); -}; +} __no_const; struct brcms_phy { struct brcms_phy_pub pubpi_ro; --- drivers/net/wireless/iwlegacy/3945-mac.c 2012-09-27 23:19:12.000000000 +0000 +++ drivers/net/wireless/iwlegacy/3945-mac.c 2012-10-15 17:30:59.819924529 +0000 @@ -3613,7 +3613,9 @@ il3945_pci_probe(struct pci_dev *pdev, c */ if (il3945_mod_params.disable_hw_scan) { D_INFO("Disabling hw_scan\n"); - il3945_mac_ops.hw_scan = NULL; + pax_open_kernel(); + *(void **)&il3945_mac_ops.hw_scan = NULL; + pax_close_kernel(); } D_INFO("*** LOAD DRIVER ***\n"); --- drivers/net/wireless/iwlwifi/dvm/debugfs.c 2012-09-27 23:19:11.000000000 +0000 +++ drivers/net/wireless/iwlwifi/dvm/debugfs.c 2012-10-15 17:30:59.819924529 +0000 @@ -203,7 +203,7 @@ static ssize_t iwl_dbgfs_sram_write(stru { struct iwl_priv *priv = file->private_data; char buf[64]; - int buf_size; + size_t buf_size; u32 offset, len; memset(buf, 0, sizeof(buf)); @@ -473,7 +473,7 @@ static ssize_t iwl_dbgfs_rx_handlers_wri struct iwl_priv *priv = file->private_data; char buf[8]; - int buf_size; + size_t buf_size; u32 reset_flag; memset(buf, 0, sizeof(buf)); @@ -554,7 +554,7 @@ static ssize_t iwl_dbgfs_disable_ht40_wr { struct iwl_priv *priv = file->private_data; char buf[8]; - int buf_size; + size_t buf_size; int ht40; memset(buf, 0, sizeof(buf)); @@ -606,7 +606,7 @@ static ssize_t iwl_dbgfs_sleep_level_ove { struct iwl_priv *priv = file->private_data; char buf[8]; - int buf_size; + size_t buf_size; int value; memset(buf, 0, sizeof(buf)); @@ -1871,7 +1871,7 @@ static ssize_t iwl_dbgfs_clear_ucode_sta { struct iwl_priv *priv = file->private_data; char buf[8]; - int buf_size; + size_t buf_size; int clear; memset(buf, 0, sizeof(buf)); @@ -1916,7 +1916,7 @@ static ssize_t iwl_dbgfs_ucode_tracing_w { struct iwl_priv *priv = file->private_data; char buf[8]; - int buf_size; + size_t buf_size; int trace; memset(buf, 0, sizeof(buf)); @@ -1987,7 +1987,7 @@ static ssize_t iwl_dbgfs_missed_beacon_w { struct iwl_priv *priv = file->private_data; char buf[8]; - int buf_size; + size_t buf_size; int missed; memset(buf, 0, sizeof(buf)); @@ -2028,7 +2028,7 @@ static ssize_t iwl_dbgfs_plcp_delta_writ struct iwl_priv *priv = file->private_data; char buf[8]; - int buf_size; + size_t buf_size; int plcp; memset(buf, 0, sizeof(buf)); @@ -2088,7 +2088,7 @@ static ssize_t iwl_dbgfs_txfifo_flush_wr struct iwl_priv *priv = file->private_data; char buf[8]; - int buf_size; + size_t buf_size; int flush; memset(buf, 0, sizeof(buf)); @@ -2178,7 +2178,7 @@ static ssize_t iwl_dbgfs_protection_mode struct iwl_priv *priv = file->private_data; char buf[8]; - int buf_size; + size_t buf_size; int rts; if (!priv->cfg->ht_params) @@ -2220,7 +2220,7 @@ static ssize_t iwl_dbgfs_echo_test_write { struct iwl_priv *priv = file->private_data; char buf[8]; - int buf_size; + size_t buf_size; memset(buf, 0, sizeof(buf)); buf_size = min(count, sizeof(buf) - 1); @@ -2256,7 +2256,7 @@ static ssize_t iwl_dbgfs_log_event_write struct iwl_priv *priv = file->private_data; u32 event_log_flag; char buf[8]; - int buf_size; + size_t buf_size; /* check that the interface is up */ if (!iwl_is_ready(priv)) @@ -2310,7 +2310,7 @@ static ssize_t iwl_dbgfs_calib_disabled_ struct iwl_priv *priv = file->private_data; char buf[8]; u32 calib_disabled; - int buf_size; + size_t buf_size; memset(buf, 0, sizeof(buf)); buf_size = min(count, sizeof(buf) - 1); --- drivers/net/wireless/iwlwifi/pcie/trans.c 2012-09-27 23:19:12.000000000 +0000 +++ drivers/net/wireless/iwlwifi/pcie/trans.c 2012-10-15 17:30:59.820924530 +0000 @@ -1944,7 +1944,7 @@ static ssize_t iwl_dbgfs_interrupt_write struct isr_statistics *isr_stats = &trans_pcie->isr_stats; char buf[8]; - int buf_size; + size_t buf_size; u32 reset_flag; memset(buf, 0, sizeof(buf)); @@ -1965,7 +1965,7 @@ static ssize_t iwl_dbgfs_csr_write(struc { struct iwl_trans *trans = file->private_data; char buf[8]; - int buf_size; + size_t buf_size; int csr; memset(buf, 0, sizeof(buf)); --- drivers/net/wireless/mac80211_hwsim.c 2012-09-27 23:19:12.000000000 +0000 +++ drivers/net/wireless/mac80211_hwsim.c 2012-10-15 17:30:59.820924530 +0000 @@ -1748,9 +1748,11 @@ static int __init init_mac80211_hwsim(vo return -EINVAL; if (fake_hw_scan) { - mac80211_hwsim_ops.hw_scan = mac80211_hwsim_hw_scan; - mac80211_hwsim_ops.sw_scan_start = NULL; - mac80211_hwsim_ops.sw_scan_complete = NULL; + pax_open_kernel(); + *(void **)&mac80211_hwsim_ops.hw_scan = mac80211_hwsim_hw_scan; + *(void **)&mac80211_hwsim_ops.sw_scan_start = NULL; + *(void **)&mac80211_hwsim_ops.sw_scan_complete = NULL; + pax_close_kernel(); } spin_lock_init(&hwsim_radio_lock); --- drivers/net/wireless/mwifiex/main.h 2012-09-27 23:19:11.000000000 +0000 +++ drivers/net/wireless/mwifiex/main.h 2012-10-15 17:30:59.820924530 +0000 @@ -571,7 +571,7 @@ struct mwifiex_if_ops { int (*event_complete) (struct mwifiex_adapter *, struct sk_buff *); int (*data_complete) (struct mwifiex_adapter *, struct sk_buff *); int (*dnld_fw) (struct mwifiex_adapter *, struct mwifiex_fw_image *); -}; +} __no_const; struct mwifiex_adapter { u8 iface_type; --- drivers/net/wireless/rndis_wlan.c 2012-09-27 23:19:12.000000000 +0000 +++ drivers/net/wireless/rndis_wlan.c 2012-10-15 17:30:59.821924531 +0000 @@ -1235,7 +1235,7 @@ static int set_rts_threshold(struct usbn netdev_dbg(usbdev->net, "%s(): %i\n", __func__, rts_threshold); - if (rts_threshold < 0 || rts_threshold > 2347) + if (rts_threshold > 2347) rts_threshold = 2347; tmp = cpu_to_le32(rts_threshold); --- drivers/net/wireless/rt2x00/rt2x00.h 2012-09-27 23:19:11.000000000 +0000 +++ drivers/net/wireless/rt2x00/rt2x00.h 2012-10-15 17:30:59.821924531 +0000 @@ -397,7 +397,7 @@ struct rt2x00_intf { * for hardware which doesn't support hardware * sequence counting. */ - atomic_t seqno; + atomic_unchecked_t seqno; }; static inline struct rt2x00_intf* vif_to_intf(struct ieee80211_vif *vif) --- drivers/net/wireless/rt2x00/rt2x00queue.c 2012-09-27 23:19:11.000000000 +0000 +++ drivers/net/wireless/rt2x00/rt2x00queue.c 2012-10-15 17:30:59.822924531 +0000 @@ -240,9 +240,9 @@ static void rt2x00queue_create_tx_descri * sequence counter given by mac80211. */ if (test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags)) - seqno = atomic_add_return(0x10, &intf->seqno); + seqno = atomic_add_return_unchecked(0x10, &intf->seqno); else - seqno = atomic_read(&intf->seqno); + seqno = atomic_read_unchecked(&intf->seqno); hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG); hdr->seq_ctrl |= cpu_to_le16(seqno); --- drivers/net/wireless/ti/wl1251/wl1251.h 2012-09-27 23:19:11.000000000 +0000 +++ drivers/net/wireless/ti/wl1251/wl1251.h 2012-10-15 17:30:59.822924531 +0000 @@ -266,7 +266,7 @@ struct wl1251_if_operations { void (*reset)(struct wl1251 *wl); void (*enable_irq)(struct wl1251 *wl); void (*disable_irq)(struct wl1251 *wl); -}; +} __no_const; struct wl1251 { struct ieee80211_hw *hw; --- drivers/net/wireless/ti/wlcore/wlcore.h 2012-09-27 23:19:12.000000000 +0000 +++ drivers/net/wireless/ti/wlcore/wlcore.h 2012-10-15 17:30:59.822924531 +0000 @@ -81,7 +81,7 @@ struct wlcore_ops { struct ieee80211_sta *sta, struct ieee80211_key_conf *key_conf); u32 (*pre_pkt_send)(struct wl1271 *wl, u32 buf_offset, u32 last_len); -}; +} __no_const; enum wlcore_partitions { PART_DOWN, --- include/linux/unaligned/access_ok.h 2012-09-17 19:15:56.000000000 +0000 +++ include/linux/unaligned/access_ok.h 2012-10-15 17:30:59.823924531 +0000 @@ -6,32 +6,32 @@ static inline u16 get_unaligned_le16(const void *p) { - return le16_to_cpup((__le16 *)p); + return le16_to_cpup((const __le16 *)p); } static inline u32 get_unaligned_le32(const void *p) { - return le32_to_cpup((__le32 *)p); + return le32_to_cpup((const __le32 *)p); } static inline u64 get_unaligned_le64(const void *p) { - return le64_to_cpup((__le64 *)p); + return le64_to_cpup((const __le64 *)p); } static inline u16 get_unaligned_be16(const void *p) { - return be16_to_cpup((__be16 *)p); + return be16_to_cpup((const __be16 *)p); } static inline u32 get_unaligned_be32(const void *p) { - return be32_to_cpup((__be32 *)p); + return be32_to_cpup((const __be32 *)p); } static inline u64 get_unaligned_be64(const void *p) { - return be64_to_cpup((__be64 *)p); + return be64_to_cpup((const __be64 *)p); } static inline void put_unaligned_le16(u16 val, void *p) --- net/bluetooth/hci_sock.c 2012-09-27 23:19:12.000000000 +0000 +++ net/bluetooth/hci_sock.c 2012-10-15 17:30:59.825924531 +0000 @@ -940,7 +940,7 @@ static int hci_sock_setsockopt(struct so uf.event_mask[1] = *((u32 *) f->event_mask + 1); } - len = min_t(unsigned int, len, sizeof(uf)); + len = min((size_t)len, sizeof(uf)); if (copy_from_user(&uf, optval, len)) { err = -EFAULT; break; --- net/bluetooth/l2cap_core.c 2012-09-27 23:19:11.000000000 +0000 +++ net/bluetooth/l2cap_core.c 2012-10-15 17:30:59.825924531 +0000 @@ -3165,8 +3165,10 @@ static int l2cap_parse_conf_rsp(struct l break; case L2CAP_CONF_RFC: - if (olen == sizeof(rfc)) - memcpy(&rfc, (void *)val, olen); + if (olen != sizeof(rfc)) + break; + + memcpy(&rfc, (void *)val, olen); if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && rfc.mode != chan->mode) --- net/bluetooth/l2cap_sock.c 2012-09-27 23:19:12.000000000 +0000 +++ net/bluetooth/l2cap_sock.c 2012-10-15 17:30:59.826924531 +0000 @@ -467,7 +467,8 @@ static int l2cap_sock_setsockopt_old(str struct sock *sk = sock->sk; struct l2cap_chan *chan = l2cap_pi(sk)->chan; struct l2cap_options opts; - int len, err = 0; + int err = 0; + size_t len = optlen; u32 opt; BT_DBG("sk %p", sk); @@ -489,7 +490,7 @@ static int l2cap_sock_setsockopt_old(str opts.max_tx = chan->max_tx; opts.txwin_size = chan->tx_win; - len = min_t(unsigned int, sizeof(opts), optlen); + len = min(sizeof(opts), len); if (copy_from_user((char *) &opts, optval, len)) { err = -EFAULT; break; @@ -574,7 +575,8 @@ static int l2cap_sock_setsockopt(struct struct bt_security sec; struct bt_power pwr; struct l2cap_conn *conn; - int len, err = 0; + int err = 0; + size_t len = optlen; u32 opt; BT_DBG("sk %p", sk); @@ -597,7 +599,7 @@ static int l2cap_sock_setsockopt(struct sec.level = BT_SECURITY_LOW; - len = min_t(unsigned int, sizeof(sec), optlen); + len = min(sizeof(sec), len); if (copy_from_user((char *) &sec, optval, len)) { err = -EFAULT; break; @@ -694,7 +696,7 @@ static int l2cap_sock_setsockopt(struct pwr.force_active = BT_POWER_FORCE_ACTIVE_ON; - len = min_t(unsigned int, sizeof(pwr), optlen); + len = min(sizeof(pwr), len); if (copy_from_user((char *) &pwr, optval, len)) { err = -EFAULT; break; --- net/bluetooth/rfcomm/sock.c 2012-09-27 23:19:12.000000000 +0000 +++ net/bluetooth/rfcomm/sock.c 2012-10-15 17:30:59.826924531 +0000 @@ -676,7 +676,7 @@ static int rfcomm_sock_setsockopt(struct struct sock *sk = sock->sk; struct bt_security sec; int err = 0; - size_t len; + size_t len = optlen; u32 opt; BT_DBG("sk %p", sk); @@ -698,7 +698,7 @@ static int rfcomm_sock_setsockopt(struct sec.level = BT_SECURITY_LOW; - len = min_t(unsigned int, sizeof(sec), optlen); + len = min(sizeof(sec), len); if (copy_from_user((char *) &sec, optval, len)) { err = -EFAULT; break; --- net/bluetooth/rfcomm/tty.c 2012-09-27 23:19:12.000000000 +0000 +++ net/bluetooth/rfcomm/tty.c 2012-10-15 17:30:59.826924531 +0000 @@ -309,7 +309,7 @@ static void rfcomm_dev_del(struct rfcomm BUG_ON(test_and_set_bit(RFCOMM_TTY_RELEASED, &dev->flags)); spin_lock_irqsave(&dev->port.lock, flags); - if (dev->port.count > 0) { + if (atomic_read(&dev->port.count) > 0) { spin_unlock_irqrestore(&dev->port.lock, flags); return; } @@ -664,10 +664,10 @@ static int rfcomm_tty_open(struct tty_st return -ENODEV; BT_DBG("dev %p dst %s channel %d opened %d", dev, batostr(&dev->dst), - dev->channel, dev->port.count); + dev->channel, atomic_read(&dev->port.count)); spin_lock_irqsave(&dev->port.lock, flags); - if (++dev->port.count > 1) { + if (atomic_inc_return(&dev->port.count) > 1) { spin_unlock_irqrestore(&dev->port.lock, flags); return 0; } @@ -736,10 +736,10 @@ static void rfcomm_tty_close(struct tty_ return; BT_DBG("tty %p dev %p dlc %p opened %d", tty, dev, dev->dlc, - dev->port.count); + atomic_read(&dev->port.count)); spin_lock_irqsave(&dev->port.lock, flags); - if (!--dev->port.count) { + if (!atomic_dec_return(&dev->port.count)) { spin_unlock_irqrestore(&dev->port.lock, flags); if (dev->tty_dev->parent) #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,29)) --- net/mac80211/ieee80211_i.h 2012-09-27 23:19:12.000000000 +0000 +++ net/mac80211/ieee80211_i.h 2012-10-15 17:30:59.827924531 +0000 @@ -28,6 +28,7 @@ #include #include #include +#include #include "key.h" #include "sta_info.h" #include "debug.h" @@ -840,7 +841,7 @@ struct ieee80211_local { /* also used to protect ampdu_ac_queue and amdpu_ac_stop_refcnt */ spinlock_t queue_stop_reason_lock; - int open_count; + local_t open_count; int monitors, cooked_mntrs; /* number of interfaces with corresponding FIF_ flags */ int fif_fcsfail, fif_plcpfail, fif_control, fif_other_bss, fif_pspoll, --- net/mac80211/iface.c 2012-09-27 23:19:12.000000000 +0000 +++ net/mac80211/iface.c 2012-10-15 17:30:59.827924531 +0000 @@ -454,7 +454,7 @@ static int ieee80211_do_open(struct net_ break; } - if (local->open_count == 0) { + if (local_read(&local->open_count) == 0) { res = drv_start(local); if (res) goto err_del_bss; @@ -497,7 +497,7 @@ static int ieee80211_do_open(struct net_ break; } - if (local->monitors == 0 && local->open_count == 0) { + if (local->monitors == 0 && local_read(&local->open_count) == 0) { res = ieee80211_add_virtual_monitor(local); if (res) goto err_stop; @@ -594,7 +594,7 @@ static int ieee80211_do_open(struct net_ mutex_unlock(&local->mtx); if (coming_up) - local->open_count++; + local_inc(&local->open_count); if (hw_reconf_flags) ieee80211_hw_config(local, hw_reconf_flags); @@ -607,7 +607,7 @@ static int ieee80211_do_open(struct net_ err_del_interface: drv_remove_interface(local, sdata); err_stop: - if (!local->open_count) + if (!local_read(&local->open_count)) drv_stop(local); err_del_bss: sdata->bss = NULL; @@ -741,7 +741,7 @@ static void ieee80211_do_stop(struct iee } if (going_down) - local->open_count--; + local_dec(&local->open_count); switch (sdata->vif.type) { case NL80211_IFTYPE_AP_VLAN: @@ -801,7 +801,7 @@ static void ieee80211_do_stop(struct iee ieee80211_recalc_ps(local, -1); - if (local->open_count == 0) { + if (local_read(&local->open_count) == 0) { if (local->ops->napi_poll) napi_disable(&local->napi); ieee80211_clear_tx_pending(local); @@ -833,7 +833,7 @@ static void ieee80211_do_stop(struct iee } spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); - if (local->monitors == local->open_count && local->monitors > 0) + if (local->monitors == local_read(&local->open_count) && local->monitors > 0) ieee80211_add_virtual_monitor(local); } --- net/mac80211/main.c 2012-09-27 23:19:12.000000000 +0000 +++ net/mac80211/main.c 2012-10-15 17:30:59.827924531 +0000 @@ -170,7 +170,7 @@ int ieee80211_hw_config(struct ieee80211 local->hw.conf.power_level = power; } - if (changed && local->open_count) { + if (changed && local_read(&local->open_count)) { ret = drv_config(local, changed); /* * Goal: --- net/mac80211/pm.c 2012-09-27 23:19:11.000000000 +0000 +++ net/mac80211/pm.c 2012-10-15 17:30:59.828924531 +0000 @@ -34,7 +34,7 @@ int __ieee80211_suspend(struct ieee80211 struct ieee80211_sub_if_data *sdata; struct sta_info *sta; - if (!local->open_count) + if (!local_read(&local->open_count)) goto suspend; ieee80211_scan_cancel(local); @@ -72,7 +72,7 @@ int __ieee80211_suspend(struct ieee80211 cancel_work_sync(&local->dynamic_ps_enable_work); del_timer_sync(&local->dynamic_ps_timer); - local->wowlan = wowlan && local->open_count; + local->wowlan = wowlan && local_read(&local->open_count); if (local->wowlan) { int err = drv_suspend(local, wowlan); if (err < 0) { @@ -143,7 +143,7 @@ int __ieee80211_suspend(struct ieee80211 drv_remove_interface(local, sdata); /* stop hardware - this must stop RX */ - if (local->open_count) + if (local_read(&local->open_count)) ieee80211_stop_device(local); suspend: --- net/mac80211/rate.c 2012-09-27 23:19:12.000000000 +0000 +++ net/mac80211/rate.c 2012-10-15 17:30:59.828924531 +0000 @@ -494,7 +494,7 @@ int ieee80211_init_rate_ctrl_alg(struct ASSERT_RTNL(); - if (local->open_count) + if (local_read(&local->open_count)) return -EBUSY; if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) { --- net/mac80211/rc80211_pid_debugfs.c 2012-09-27 23:19:11.000000000 +0000 +++ net/mac80211/rc80211_pid_debugfs.c 2012-10-15 17:30:59.828924531 +0000 @@ -193,7 +193,7 @@ static ssize_t rate_control_pid_events_r spin_unlock_irqrestore(&events->lock, status); - if (copy_to_user(buf, pb, p)) + if (p > sizeof(pb) || copy_to_user(buf, pb, p)) return -EFAULT; return p; --- net/mac80211/util.c 2012-09-27 23:19:11.000000000 +0000 +++ net/mac80211/util.c 2012-10-15 17:30:59.828924531 +0000 @@ -1251,7 +1251,7 @@ int ieee80211_reconfig(struct ieee80211_ } #endif /* everything else happens only if HW was up & running */ - if (!local->open_count) + if (!local_read(&local->open_count)) goto wake_up; /* --- net/wireless/core.h 2012-09-27 23:19:11.000000000 +0000 +++ net/wireless/core.h 2012-10-15 17:30:59.829924531 +0000 @@ -28,7 +28,7 @@ struct cfg80211_registered_device { struct mutex mtx; /* rfkill support */ - struct rfkill_ops rfkill_ops; + rfkill_ops_no_const rfkill_ops; struct rfkill *rfkill; struct work_struct rfkill_sync; --- net/wireless/wext-core.c 2012-09-27 23:19:12.000000000 +0000 +++ net/wireless/wext-core.c 2012-10-15 17:30:59.829924531 +0000 @@ -792,8 +792,7 @@ static int ioctl_standard_iw_point(struc */ /* Support for very large requests */ - if ((descr->flags & IW_DESCR_FLAG_NOMAX) && - (user_length > descr->max_tokens)) { + if (user_length > descr->max_tokens) { /* Allow userspace to GET more than max so * we can support any size GET requests. * There is still a limit : -ENOMEM. @@ -832,22 +831,6 @@ static int ioctl_standard_iw_point(struc } } - if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) { - /* - * If this is a GET, but not NOMAX, it means that the extra - * data is not bounded by userspace, but by max_tokens. Thus - * set the length to max_tokens. This matches the extra data - * allocation. - * The driver should fill it with the number of tokens it - * provided, and it may check iwp->length rather than having - * knowledge of max_tokens. If the driver doesn't change the - * iwp->length, this ioctl just copies back max_token tokens - * filled with zeroes. Hopefully the driver isn't claiming - * them to be valid data. - */ - iwp->length = descr->max_tokens; - } - err = handler(dev, info, (union iwreq_data *) iwp, extra); iwp->length += essid_compat; --- scripts/gcc-plugin.sh 1970-01-01 00:00:00.000000000 +0000 +++ scripts/gcc-plugin.sh 2012-10-15 17:30:59.829924531 +0000 @@ -0,0 +1,17 @@ +#!/bin/bash +plugincc=`$1 -x c -shared - -o /dev/null -I\`$3 -print-file-name=plugin\`/include 2>&1 < + * Licensed under the GPL v2 + * + * Note: the choice of the license means that the compilation process is + * NOT 'eligible' as defined by gcc's library exception to the GPL v3, + * but for the kernel it doesn't matter since it doesn't link against + * any of the gcc libraries + * + * gcc plugin to implement various sparse (source code checker) features + * + * TODO: + * - define separate __iomem, __percpu and __rcu address spaces (lots of code to patch) + * + * BUGS: + * - none known + */ +#include "gcc-plugin.h" +#include "config.h" +#include "system.h" +#include "coretypes.h" +#include "tree.h" +#include "tree-pass.h" +#include "flags.h" +#include "intl.h" +#include "toplev.h" +#include "plugin.h" +//#include "expr.h" where are you... +#include "diagnostic.h" +#include "plugin-version.h" +#include "tm.h" +#include "function.h" +#include "basic-block.h" +#include "gimple.h" +#include "rtl.h" +#include "emit-rtl.h" +#include "tree-flow.h" +#include "target.h" + +extern void c_register_addr_space (const char *str, addr_space_t as); +extern enum machine_mode default_addr_space_pointer_mode (addr_space_t); +extern enum machine_mode default_addr_space_address_mode (addr_space_t); +extern bool default_addr_space_valid_pointer_mode(enum machine_mode mode, addr_space_t as); +extern bool default_addr_space_legitimate_address_p(enum machine_mode mode, rtx mem, bool strict, addr_space_t as); +extern rtx default_addr_space_legitimize_address(rtx x, rtx oldx, enum machine_mode mode, addr_space_t as); + +extern void print_gimple_stmt(FILE *, gimple, int, int); +extern rtx emit_move_insn(rtx x, rtx y); + +int plugin_is_GPL_compatible; + +static struct plugin_info checker_plugin_info = { + .version = "201111150100", +}; + +#define ADDR_SPACE_KERNEL 0 +#define ADDR_SPACE_FORCE_KERNEL 1 +#define ADDR_SPACE_USER 2 +#define ADDR_SPACE_FORCE_USER 3 +#define ADDR_SPACE_IOMEM 0 +#define ADDR_SPACE_FORCE_IOMEM 0 +#define ADDR_SPACE_PERCPU 0 +#define ADDR_SPACE_FORCE_PERCPU 0 +#define ADDR_SPACE_RCU 0 +#define ADDR_SPACE_FORCE_RCU 0 + +static enum machine_mode checker_addr_space_pointer_mode(addr_space_t addrspace) +{ + return default_addr_space_pointer_mode(ADDR_SPACE_GENERIC); +} + +static enum machine_mode checker_addr_space_address_mode(addr_space_t addrspace) +{ + return default_addr_space_address_mode(ADDR_SPACE_GENERIC); +} + +static bool checker_addr_space_valid_pointer_mode(enum machine_mode mode, addr_space_t as) +{ + return default_addr_space_valid_pointer_mode(mode, as); +} + +static bool checker_addr_space_legitimate_address_p(enum machine_mode mode, rtx mem, bool strict, addr_space_t as) +{ + return default_addr_space_legitimate_address_p(mode, mem, strict, ADDR_SPACE_GENERIC); +} + +static rtx checker_addr_space_legitimize_address(rtx x, rtx oldx, enum machine_mode mode, addr_space_t as) +{ + return default_addr_space_legitimize_address(x, oldx, mode, as); +} + +static bool checker_addr_space_subset_p(addr_space_t subset, addr_space_t superset) +{ + if (subset == ADDR_SPACE_FORCE_KERNEL && superset == ADDR_SPACE_KERNEL) + return true; + + if (subset == ADDR_SPACE_FORCE_USER && superset == ADDR_SPACE_USER) + return true; + + if (subset == ADDR_SPACE_FORCE_IOMEM && superset == ADDR_SPACE_IOMEM) + return true; + + if (subset == ADDR_SPACE_KERNEL && superset == ADDR_SPACE_FORCE_USER) + return true; + + if (subset == ADDR_SPACE_KERNEL && superset == ADDR_SPACE_FORCE_IOMEM) + return true; + + if (subset == ADDR_SPACE_USER && superset == ADDR_SPACE_FORCE_KERNEL) + return true; + + if (subset == ADDR_SPACE_IOMEM && superset == ADDR_SPACE_FORCE_KERNEL) + return true; + + return subset == superset; +} + +static rtx checker_addr_space_convert(rtx op, tree from_type, tree to_type) +{ +// addr_space_t from_as = TYPE_ADDR_SPACE(TREE_TYPE(from_type)); +// addr_space_t to_as = TYPE_ADDR_SPACE(TREE_TYPE(to_type)); + + return op; +} + +static void register_checker_address_spaces(void *event_data, void *data) +{ + c_register_addr_space("__kernel", ADDR_SPACE_KERNEL); + c_register_addr_space("__force_kernel", ADDR_SPACE_FORCE_KERNEL); + c_register_addr_space("__user", ADDR_SPACE_USER); + c_register_addr_space("__force_user", ADDR_SPACE_FORCE_USER); +// c_register_addr_space("__iomem", ADDR_SPACE_IOMEM); +// c_register_addr_space("__force_iomem", ADDR_SPACE_FORCE_IOMEM); +// c_register_addr_space("__percpu", ADDR_SPACE_PERCPU); +// c_register_addr_space("__force_percpu", ADDR_SPACE_FORCE_PERCPU); +// c_register_addr_space("__rcu", ADDR_SPACE_RCU); +// c_register_addr_space("__force_rcu", ADDR_SPACE_FORCE_RCU); + + targetm.addr_space.pointer_mode = checker_addr_space_pointer_mode; + targetm.addr_space.address_mode = checker_addr_space_address_mode; + targetm.addr_space.valid_pointer_mode = checker_addr_space_valid_pointer_mode; + targetm.addr_space.legitimate_address_p = checker_addr_space_legitimate_address_p; +// targetm.addr_space.legitimize_address = checker_addr_space_legitimize_address; + targetm.addr_space.subset_p = checker_addr_space_subset_p; + targetm.addr_space.convert = checker_addr_space_convert; +} + +int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version) +{ + const char * const plugin_name = plugin_info->base_name; + const int argc = plugin_info->argc; + const struct plugin_argument * const argv = plugin_info->argv; + int i; + + if (!plugin_default_version_check(version, &gcc_version)) { + error(G_("incompatible gcc/plugin versions")); + return 1; + } + + register_callback(plugin_name, PLUGIN_INFO, NULL, &checker_plugin_info); + + for (i = 0; i < argc; ++i) + error(G_("unkown option '-fplugin-arg-%s-%s'"), plugin_name, argv[i].key); + + if (TARGET_64BIT == 0) + return 0; + + register_callback(plugin_name, PLUGIN_PRAGMAS, register_checker_address_spaces, NULL); + + return 0; +} --- tools/gcc/colorize_plugin.c 1970-01-01 00:00:00.000000000 +0000 +++ tools/gcc/colorize_plugin.c 2012-10-15 17:30:59.830924531 +0000 @@ -0,0 +1,148 @@ +/* + * Copyright 2012 by PaX Team + * Licensed under the GPL v2 + * + * Note: the choice of the license means that the compilation process is + * NOT 'eligible' as defined by gcc's library exception to the GPL v3, + * but for the kernel it doesn't matter since it doesn't link against + * any of the gcc libraries + * + * gcc plugin to colorize diagnostic output + * + */ + +#include "gcc-plugin.h" +#include "config.h" +#include "system.h" +#include "coretypes.h" +#include "tree.h" +#include "tree-pass.h" +#include "flags.h" +#include "intl.h" +#include "toplev.h" +#include "plugin.h" +#include "diagnostic.h" +#include "plugin-version.h" +#include "tm.h" + +int plugin_is_GPL_compatible; + +static struct plugin_info colorize_plugin_info = { + .version = "201203092200", + .help = NULL, +}; + +#define GREEN "\033[32m\033[2m" +#define LIGHTGREEN "\033[32m\033[1m" +#define YELLOW "\033[33m\033[2m" +#define LIGHTYELLOW "\033[33m\033[1m" +#define RED "\033[31m\033[2m" +#define LIGHTRED "\033[31m\033[1m" +#define BLUE "\033[34m\033[2m" +#define LIGHTBLUE "\033[34m\033[1m" +#define BRIGHT "\033[m\033[1m" +#define NORMAL "\033[m" + +static diagnostic_starter_fn old_starter; +static diagnostic_finalizer_fn old_finalizer; + +static void start_colorize(diagnostic_context *context, diagnostic_info *diagnostic) +{ + const char *color; + char *newprefix; + + switch (diagnostic->kind) { + case DK_NOTE: + color = LIGHTBLUE; + break; + + case DK_PEDWARN: + case DK_WARNING: + color = LIGHTYELLOW; + break; + + case DK_ERROR: + case DK_FATAL: + case DK_ICE: + case DK_PERMERROR: + case DK_SORRY: + color = LIGHTRED; + break; + + default: + color = NORMAL; + } + + old_starter(context, diagnostic); + if (-1 == asprintf(&newprefix, "%s%s" NORMAL, color, context->printer->prefix)) + return; + pp_destroy_prefix(context->printer); + pp_set_prefix(context->printer, newprefix); +} + +static void finalize_colorize(diagnostic_context *context, diagnostic_info *diagnostic) +{ + old_finalizer(context, diagnostic); +} + +static void colorize_arm(void) +{ + old_starter = diagnostic_starter(global_dc); + old_finalizer = diagnostic_finalizer(global_dc); + + diagnostic_starter(global_dc) = start_colorize; + diagnostic_finalizer(global_dc) = finalize_colorize; +} + +static unsigned int execute_colorize_rearm(void) +{ + if (diagnostic_starter(global_dc) == start_colorize) + return 0; + + colorize_arm(); + return 0; +} + +struct simple_ipa_opt_pass pass_ipa_colorize_rearm = { + .pass = { + .type = SIMPLE_IPA_PASS, + .name = "colorize_rearm", + .gate = NULL, + .execute = execute_colorize_rearm, + .sub = NULL, + .next = NULL, + .static_pass_number = 0, + .tv_id = TV_NONE, + .properties_required = 0, + .properties_provided = 0, + .properties_destroyed = 0, + .todo_flags_start = 0, + .todo_flags_finish = 0 + } +}; + +static void colorize_start_unit(void *gcc_data, void *user_data) +{ + colorize_arm(); +} + +int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version) +{ + const char * const plugin_name = plugin_info->base_name; + struct register_pass_info colorize_rearm_pass_info = { + .pass = &pass_ipa_colorize_rearm.pass, + .reference_pass_name = "*free_lang_data", + .ref_pass_instance_number = 1, + .pos_op = PASS_POS_INSERT_AFTER + }; + + if (!plugin_default_version_check(version, &gcc_version)) { + error(G_("incompatible gcc/plugin versions")); + return 1; + } + + register_callback(plugin_name, PLUGIN_INFO, NULL, &colorize_plugin_info); + register_callback(plugin_name, PLUGIN_START_UNIT, &colorize_start_unit, NULL); + register_callback(plugin_name, PLUGIN_PASS_MANAGER_SETUP, NULL, &colorize_rearm_pass_info); + return 0; +} --- tools/gcc/constify_plugin.c 1970-01-01 00:00:00.000000000 +0000 +++ tools/gcc/constify_plugin.c 2012-10-15 17:30:59.830924531 +0000 @@ -0,0 +1,331 @@ +/* + * Copyright 2011 by Emese Revfy + * Copyright 2011 by PaX Team + * Licensed under the GPL v2, or (at your option) v3 + * + * This gcc plugin constifies all structures which contain only function pointers or are explicitly marked for constification. + * + * Homepage: + * http://www.grsecurity.net/~ephox/const_plugin/ + * + * Usage: + * $ gcc -I`gcc -print-file-name=plugin`/include -fPIC -shared -O2 -o constify_plugin.so constify_plugin.c + * $ gcc -fplugin=constify_plugin.so test.c -O2 + */ + +#include "gcc-plugin.h" +#include "config.h" +#include "system.h" +#include "coretypes.h" +#include "tree.h" +#include "tree-pass.h" +#include "flags.h" +#include "intl.h" +#include "toplev.h" +#include "plugin.h" +#include "diagnostic.h" +#include "plugin-version.h" +#include "tm.h" +#include "function.h" +#include "basic-block.h" +#include "gimple.h" +#include "rtl.h" +#include "emit-rtl.h" +#include "tree-flow.h" + +#define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1(TYPE) + +int plugin_is_GPL_compatible; + +static struct plugin_info const_plugin_info = { + .version = "201205300030", + .help = "no-constify\tturn off constification\n", +}; + +static void deconstify_tree(tree node); + +static void deconstify_type(tree type) +{ + tree field; + + for (field = TYPE_FIELDS(type); field; field = TREE_CHAIN(field)) { + tree type = TREE_TYPE(field); + + if (TREE_CODE(type) != RECORD_TYPE && TREE_CODE(type) != UNION_TYPE) + continue; + if (!TYPE_READONLY(type)) + continue; + + deconstify_tree(field); + } + TYPE_READONLY(type) = 0; + C_TYPE_FIELDS_READONLY(type) = 0; +} + +static void deconstify_tree(tree node) +{ + tree old_type, new_type, field; + + old_type = TREE_TYPE(node); + + gcc_assert(TYPE_READONLY(old_type) && (TYPE_QUALS(old_type) & TYPE_QUAL_CONST)); + + new_type = build_qualified_type(old_type, TYPE_QUALS(old_type) & ~TYPE_QUAL_CONST); + TYPE_FIELDS(new_type) = copy_list(TYPE_FIELDS(new_type)); + for (field = TYPE_FIELDS(new_type); field; field = TREE_CHAIN(field)) + DECL_FIELD_CONTEXT(field) = new_type; + + deconstify_type(new_type); + + TREE_READONLY(node) = 0; + TREE_TYPE(node) = new_type; +} + +static tree handle_no_const_attribute(tree *node, tree name, tree args, int flags, bool *no_add_attrs) +{ + tree type; + + *no_add_attrs = true; + if (TREE_CODE(*node) == FUNCTION_DECL) { + error("%qE attribute does not apply to functions", name); + return NULL_TREE; + } + + if (TREE_CODE(*node) == VAR_DECL) { + error("%qE attribute does not apply to variables", name); + return NULL_TREE; + } + + if (TYPE_P(*node)) { + if (TREE_CODE(*node) == RECORD_TYPE || TREE_CODE(*node) == UNION_TYPE) + *no_add_attrs = false; + else + error("%qE attribute applies to struct and union types only", name); + return NULL_TREE; + } + + type = TREE_TYPE(*node); + + if (TREE_CODE(type) != RECORD_TYPE && TREE_CODE(type) != UNION_TYPE) { + error("%qE attribute applies to struct and union types only", name); + return NULL_TREE; + } + + if (lookup_attribute(IDENTIFIER_POINTER(name), TYPE_ATTRIBUTES(type))) { + error("%qE attribute is already applied to the type", name); + return NULL_TREE; + } + + if (TREE_CODE(*node) == TYPE_DECL && !TYPE_READONLY(type)) { + error("%qE attribute used on type that is not constified", name); + return NULL_TREE; + } + + if (TREE_CODE(*node) == TYPE_DECL) { + deconstify_tree(*node); + return NULL_TREE; + } + + return NULL_TREE; +} + +static void constify_type(tree type) +{ + TYPE_READONLY(type) = 1; + C_TYPE_FIELDS_READONLY(type) = 1; +} + +static tree handle_do_const_attribute(tree *node, tree name, tree args, int flags, bool *no_add_attrs) +{ + *no_add_attrs = true; + if (!TYPE_P(*node)) { + error("%qE attribute applies to types only", name); + return NULL_TREE; + } + + if (TREE_CODE(*node) != RECORD_TYPE && TREE_CODE(*node) != UNION_TYPE) { + error("%qE attribute applies to struct and union types only", name); + return NULL_TREE; + } + + *no_add_attrs = false; + constify_type(*node); + return NULL_TREE; +} + +static struct attribute_spec no_const_attr = { + .name = "no_const", + .min_length = 0, + .max_length = 0, + .decl_required = false, + .type_required = false, + .function_type_required = false, + .handler = handle_no_const_attribute, +#if BUILDING_GCC_VERSION >= 4007 + .affects_type_identity = true +#endif +}; + +static struct attribute_spec do_const_attr = { + .name = "do_const", + .min_length = 0, + .max_length = 0, + .decl_required = false, + .type_required = false, + .function_type_required = false, + .handler = handle_do_const_attribute, +#if BUILDING_GCC_VERSION >= 4007 + .affects_type_identity = true +#endif +}; + +static void register_attributes(void *event_data, void *data) +{ + register_attribute(&no_const_attr); + register_attribute(&do_const_attr); +} + +static bool is_fptr(tree field) +{ + tree ptr = TREE_TYPE(field); + + if (TREE_CODE(ptr) != POINTER_TYPE) + return false; + + return TREE_CODE(TREE_TYPE(ptr)) == FUNCTION_TYPE; +} + +static bool walk_struct(tree node) +{ + tree field; + + if (TYPE_FIELDS(node) == NULL_TREE) + return false; + + if (lookup_attribute("no_const", TYPE_ATTRIBUTES(node))) { + gcc_assert(!TYPE_READONLY(node)); + deconstify_type(node); + return false; + } + + for (field = TYPE_FIELDS(node); field; field = TREE_CHAIN(field)) { + tree type = TREE_TYPE(field); + enum tree_code code = TREE_CODE(type); + + if (node == type) + return false; + if (code == RECORD_TYPE || code == UNION_TYPE) { + if (!(walk_struct(type))) + return false; + } else if (!is_fptr(field) && !TREE_READONLY(field)) + return false; + } + return true; +} + +static void finish_type(void *event_data, void *data) +{ + tree type = (tree)event_data; + + if (type == NULL_TREE || type == error_mark_node) + return; + + if (TYPE_READONLY(type)) + return; + + if (walk_struct(type)) + constify_type(type); +} + +static unsigned int check_local_variables(void); + +struct gimple_opt_pass pass_local_variable = { + { + .type = GIMPLE_PASS, + .name = "check_local_variables", + .gate = NULL, + .execute = check_local_variables, + .sub = NULL, + .next = NULL, + .static_pass_number = 0, + .tv_id = TV_NONE, + .properties_required = 0, + .properties_provided = 0, + .properties_destroyed = 0, + .todo_flags_start = 0, + .todo_flags_finish = 0 + } +}; + +static unsigned int check_local_variables(void) +{ + tree var; + referenced_var_iterator rvi; + +#if BUILDING_GCC_VERSION == 4005 + FOR_EACH_REFERENCED_VAR(var, rvi) { +#else + FOR_EACH_REFERENCED_VAR(cfun, var, rvi) { +#endif + tree type = TREE_TYPE(var); + + if (!DECL_P(var) || TREE_STATIC(var) || DECL_EXTERNAL(var)) + continue; + + if (TREE_CODE(type) != RECORD_TYPE && TREE_CODE(type) != UNION_TYPE) + continue; + + if (!TYPE_READONLY(type)) + continue; + +// if (lookup_attribute("no_const", DECL_ATTRIBUTES(var))) +// continue; + +// if (lookup_attribute("no_const", TYPE_ATTRIBUTES(type))) +// continue; + + if (walk_struct(type)) { + error_at(DECL_SOURCE_LOCATION(var), "constified variable %qE cannot be local", var); + return 1; + } + } + return 0; +} + +int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version) +{ + const char * const plugin_name = plugin_info->base_name; + const int argc = plugin_info->argc; + const struct plugin_argument * const argv = plugin_info->argv; + int i; + bool constify = true; + + struct register_pass_info local_variable_pass_info = { + .pass = &pass_local_variable.pass, + .reference_pass_name = "*referenced_vars", + .ref_pass_instance_number = 1, + .pos_op = PASS_POS_INSERT_AFTER + }; + + if (!plugin_default_version_check(version, &gcc_version)) { + error(G_("incompatible gcc/plugin versions")); + return 1; + } + + for (i = 0; i < argc; ++i) { + if (!(strcmp(argv[i].key, "no-constify"))) { + constify = false; + continue; + } + error(G_("unkown option '-fplugin-arg-%s-%s'"), plugin_name, argv[i].key); + } + + register_callback(plugin_name, PLUGIN_INFO, NULL, &const_plugin_info); + if (constify) { + register_callback(plugin_name, PLUGIN_FINISH_TYPE, finish_type, NULL); + register_callback(plugin_name, PLUGIN_PASS_MANAGER_SETUP, NULL, &local_variable_pass_info); + } + register_callback(plugin_name, PLUGIN_ATTRIBUTES, register_attributes, NULL); + + return 0; +} --- tools/gcc/generate_size_overflow_hash.sh 1970-01-01 00:00:00.000000000 +0000 +++ tools/gcc/generate_size_overflow_hash.sh 2012-10-15 17:30:59.830924531 +0000 @@ -0,0 +1,94 @@ +#!/bin/bash + +# This script generates the hash table (size_overflow_hash.h) for the size_overflow gcc plugin (size_overflow_plugin.c). + +header1="size_overflow_hash.h" +database="size_overflow_hash.data" +n=65536 + +usage() { +cat <> "$header1" + done + echo >> "$header1" +} + +create_structs () { + rm -f "$header1" + + create_defines + + cat "$database" | while read data + do + data_array=($data) + struct_hash_name="${data_array[0]}" + funcn="${data_array[1]}" + params="${data_array[2]}" + next="${data_array[5]}" + + echo "const struct size_overflow_hash $struct_hash_name = {" >> "$header1" + + echo -e "\t.next\t= $next,\n\t.name\t= \"$funcn\"," >> "$header1" + echo -en "\t.param\t= " >> "$header1" + line= + for param_num in ${params//-/ }; + do + line="${line}PARAM"$param_num"|" + done + + echo -e "${line%?},\n};\n" >> "$header1" + done +} + +create_headers () { + echo "const struct size_overflow_hash * const size_overflow_hash[$n] = {" >> "$header1" +} + +create_array_elements () { + index=0 + grep -v "nohasharray" $database | sort -n -k 4 | while read data + do + data_array=($data) + i="${data_array[3]}" + hash="${data_array[4]}" + while [[ $index -lt $i ]] + do + echo -e "\t["$index"]\t= NULL," >> "$header1" + index=$(($index + 1)) + done + index=$(($index + 1)) + echo -e "\t["$i"]\t= &"$hash"," >> "$header1" + done + echo '};' >> $header1 +} + +create_structs +create_headers +create_array_elements + +exit 0 --- tools/gcc/kallocstat_plugin.c 1970-01-01 00:00:00.000000000 +0000 +++ tools/gcc/kallocstat_plugin.c 2012-10-15 17:30:59.831924531 +0000 @@ -0,0 +1,167 @@ +/* + * Copyright 2011 by the PaX Team + * Licensed under the GPL v2 + * + * Note: the choice of the license means that the compilation process is + * NOT 'eligible' as defined by gcc's library exception to the GPL v3, + * but for the kernel it doesn't matter since it doesn't link against + * any of the gcc libraries + * + * gcc plugin to find the distribution of k*alloc sizes + * + * TODO: + * + * BUGS: + * - none known + */ +#include "gcc-plugin.h" +#include "config.h" +#include "system.h" +#include "coretypes.h" +#include "tree.h" +#include "tree-pass.h" +#include "flags.h" +#include "intl.h" +#include "toplev.h" +#include "plugin.h" +//#include "expr.h" where are you... +#include "diagnostic.h" +#include "plugin-version.h" +#include "tm.h" +#include "function.h" +#include "basic-block.h" +#include "gimple.h" +#include "rtl.h" +#include "emit-rtl.h" + +extern void print_gimple_stmt(FILE *, gimple, int, int); + +int plugin_is_GPL_compatible; + +static const char * const kalloc_functions[] = { + "__kmalloc", + "kmalloc", + "kmalloc_large", + "kmalloc_node", + "kmalloc_order", + "kmalloc_order_trace", + "kmalloc_slab", + "kzalloc", + "kzalloc_node", +}; + +static struct plugin_info kallocstat_plugin_info = { + .version = "201111150100", +}; + +static unsigned int execute_kallocstat(void); + +static struct gimple_opt_pass kallocstat_pass = { + .pass = { + .type = GIMPLE_PASS, + .name = "kallocstat", + .gate = NULL, + .execute = execute_kallocstat, + .sub = NULL, + .next = NULL, + .static_pass_number = 0, + .tv_id = TV_NONE, + .properties_required = 0, + .properties_provided = 0, + .properties_destroyed = 0, + .todo_flags_start = 0, + .todo_flags_finish = 0 + } +}; + +static bool is_kalloc(const char *fnname) +{ + size_t i; + + for (i = 0; i < ARRAY_SIZE(kalloc_functions); i++) + if (!strcmp(fnname, kalloc_functions[i])) + return true; + return false; +} + +static unsigned int execute_kallocstat(void) +{ + basic_block bb; + + // 1. loop through BBs and GIMPLE statements + FOR_EACH_BB(bb) { + gimple_stmt_iterator gsi; + for (gsi = gsi_start_bb(bb); !gsi_end_p(gsi); gsi_next(&gsi)) { + // gimple match: + tree fndecl, size; + gimple call_stmt; + const char *fnname; + + // is it a call + call_stmt = gsi_stmt(gsi); + if (!is_gimple_call(call_stmt)) + continue; + fndecl = gimple_call_fndecl(call_stmt); + if (fndecl == NULL_TREE) + continue; + if (TREE_CODE(fndecl) != FUNCTION_DECL) + continue; + + // is it a call to k*alloc + fnname = IDENTIFIER_POINTER(DECL_NAME(fndecl)); + if (!is_kalloc(fnname)) + continue; + + // is the size arg the result of a simple const assignment + size = gimple_call_arg(call_stmt, 0); + while (true) { + gimple def_stmt; + expanded_location xloc; + size_t size_val; + + if (TREE_CODE(size) != SSA_NAME) + break; + def_stmt = SSA_NAME_DEF_STMT(size); + if (!def_stmt || !is_gimple_assign(def_stmt)) + break; + if (gimple_num_ops(def_stmt) != 2) + break; + size = gimple_assign_rhs1(def_stmt); + if (!TREE_CONSTANT(size)) + continue; + xloc = expand_location(gimple_location(def_stmt)); + if (!xloc.file) + xloc = expand_location(DECL_SOURCE_LOCATION(current_function_decl)); + size_val = TREE_INT_CST_LOW(size); + fprintf(stderr, "kallocsize: %8zu %8zx %s %s:%u\n", size_val, size_val, fnname, xloc.file, xloc.line); + break; + } +//print_gimple_stmt(stderr, call_stmt, 0, TDF_LINENO); +//debug_tree(gimple_call_fn(call_stmt)); +//print_node(stderr, "pax", fndecl, 4); + } + } + + return 0; +} + +int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version) +{ + const char * const plugin_name = plugin_info->base_name; + struct register_pass_info kallocstat_pass_info = { + .pass = &kallocstat_pass.pass, + .reference_pass_name = "ssa", + .ref_pass_instance_number = 1, + .pos_op = PASS_POS_INSERT_AFTER + }; + + if (!plugin_default_version_check(version, &gcc_version)) { + error(G_("incompatible gcc/plugin versions")); + return 1; + } + + register_callback(plugin_name, PLUGIN_INFO, NULL, &kallocstat_plugin_info); + register_callback(plugin_name, PLUGIN_PASS_MANAGER_SETUP, NULL, &kallocstat_pass_info); + + return 0; +} --- tools/gcc/kernexec_plugin.c 1970-01-01 00:00:00.000000000 +0000 +++ tools/gcc/kernexec_plugin.c 2012-10-15 17:30:59.831924531 +0000 @@ -0,0 +1,427 @@ +/* + * Copyright 2011 by the PaX Team + * Licensed under the GPL v2 + * + * Note: the choice of the license means that the compilation process is + * NOT 'eligible' as defined by gcc's library exception to the GPL v3, + * but for the kernel it doesn't matter since it doesn't link against + * any of the gcc libraries + * + * gcc plugin to make KERNEXEC/amd64 almost as good as it is on i386 + * + * TODO: + * + * BUGS: + * - none known + */ +#include "gcc-plugin.h" +#include "config.h" +#include "system.h" +#include "coretypes.h" +#include "tree.h" +#include "tree-pass.h" +#include "flags.h" +#include "intl.h" +#include "toplev.h" +#include "plugin.h" +//#include "expr.h" where are you... +#include "diagnostic.h" +#include "plugin-version.h" +#include "tm.h" +#include "function.h" +#include "basic-block.h" +#include "gimple.h" +#include "rtl.h" +#include "emit-rtl.h" +#include "tree-flow.h" + +extern void print_gimple_stmt(FILE *, gimple, int, int); +extern rtx emit_move_insn(rtx x, rtx y); + +int plugin_is_GPL_compatible; + +static struct plugin_info kernexec_plugin_info = { + .version = "201111291120", + .help = "method=[bts|or]\tinstrumentation method\n" +}; + +static unsigned int execute_kernexec_reload(void); +static unsigned int execute_kernexec_fptr(void); +static unsigned int execute_kernexec_retaddr(void); +static bool kernexec_cmodel_check(void); + +static void (*kernexec_instrument_fptr)(gimple_stmt_iterator *); +static void (*kernexec_instrument_retaddr)(rtx); + +static struct gimple_opt_pass kernexec_reload_pass = { + .pass = { + .type = GIMPLE_PASS, + .name = "kernexec_reload", + .gate = kernexec_cmodel_check, + .execute = execute_kernexec_reload, + .sub = NULL, + .next = NULL, + .static_pass_number = 0, + .tv_id = TV_NONE, + .properties_required = 0, + .properties_provided = 0, + .properties_destroyed = 0, + .todo_flags_start = 0, + .todo_flags_finish = TODO_verify_ssa | TODO_verify_stmts | TODO_dump_func | TODO_remove_unused_locals | TODO_update_ssa_no_phi + } +}; + +static struct gimple_opt_pass kernexec_fptr_pass = { + .pass = { + .type = GIMPLE_PASS, + .name = "kernexec_fptr", + .gate = kernexec_cmodel_check, + .execute = execute_kernexec_fptr, + .sub = NULL, + .next = NULL, + .static_pass_number = 0, + .tv_id = TV_NONE, + .properties_required = 0, + .properties_provided = 0, + .properties_destroyed = 0, + .todo_flags_start = 0, + .todo_flags_finish = TODO_verify_ssa | TODO_verify_stmts | TODO_dump_func | TODO_remove_unused_locals | TODO_update_ssa_no_phi + } +}; + +static struct rtl_opt_pass kernexec_retaddr_pass = { + .pass = { + .type = RTL_PASS, + .name = "kernexec_retaddr", + .gate = kernexec_cmodel_check, + .execute = execute_kernexec_retaddr, + .sub = NULL, + .next = NULL, + .static_pass_number = 0, + .tv_id = TV_NONE, + .properties_required = 0, + .properties_provided = 0, + .properties_destroyed = 0, + .todo_flags_start = 0, + .todo_flags_finish = TODO_dump_func | TODO_ggc_collect + } +}; + +static bool kernexec_cmodel_check(void) +{ + tree section; + + if (ix86_cmodel != CM_KERNEL) + return false; + + section = lookup_attribute("section", DECL_ATTRIBUTES(current_function_decl)); + if (!section || !TREE_VALUE(section)) + return true; + + section = TREE_VALUE(TREE_VALUE(section)); + if (strncmp(TREE_STRING_POINTER(section), ".vsyscall_", 10)) + return true; + + return false; +} + +/* + * add special KERNEXEC instrumentation: reload %r10 after it has been clobbered + */ +static void kernexec_reload_fptr_mask(gimple_stmt_iterator *gsi) +{ + gimple asm_movabs_stmt; + + // build asm volatile("movabs $0x8000000000000000, %%r10\n\t" : : : ); + asm_movabs_stmt = gimple_build_asm_vec("movabs $0x8000000000000000, %%r10\n\t", NULL, NULL, NULL, NULL); + gimple_asm_set_volatile(asm_movabs_stmt, true); + gsi_insert_after(gsi, asm_movabs_stmt, GSI_CONTINUE_LINKING); + update_stmt(asm_movabs_stmt); +} + +/* + * find all asm() stmts that clobber r10 and add a reload of r10 + */ +static unsigned int execute_kernexec_reload(void) +{ + basic_block bb; + + // 1. loop through BBs and GIMPLE statements + FOR_EACH_BB(bb) { + gimple_stmt_iterator gsi; + + for (gsi = gsi_start_bb(bb); !gsi_end_p(gsi); gsi_next(&gsi)) { + // gimple match: __asm__ ("" : : : "r10"); + gimple asm_stmt; + size_t nclobbers; + + // is it an asm ... + asm_stmt = gsi_stmt(gsi); + if (gimple_code(asm_stmt) != GIMPLE_ASM) + continue; + + // ... clobbering r10 + nclobbers = gimple_asm_nclobbers(asm_stmt); + while (nclobbers--) { + tree op = gimple_asm_clobber_op(asm_stmt, nclobbers); + if (strcmp(TREE_STRING_POINTER(TREE_VALUE(op)), "r10")) + continue; + kernexec_reload_fptr_mask(&gsi); +//print_gimple_stmt(stderr, asm_stmt, 0, TDF_LINENO); + break; + } + } + } + + return 0; +} + +/* + * add special KERNEXEC instrumentation: force MSB of fptr to 1, which will produce + * a non-canonical address from a userland ptr and will just trigger a GPF on dereference + */ +static void kernexec_instrument_fptr_bts(gimple_stmt_iterator *gsi) +{ + gimple assign_intptr, assign_new_fptr, call_stmt; + tree intptr, old_fptr, new_fptr, kernexec_mask; + + call_stmt = gsi_stmt(*gsi); + old_fptr = gimple_call_fn(call_stmt); + + // create temporary unsigned long variable used for bitops and cast fptr to it + intptr = create_tmp_var(long_unsigned_type_node, "kernexec_bts"); + add_referenced_var(intptr); + mark_sym_for_renaming(intptr); + assign_intptr = gimple_build_assign(intptr, fold_convert(long_unsigned_type_node, old_fptr)); + gsi_insert_before(gsi, assign_intptr, GSI_SAME_STMT); + update_stmt(assign_intptr); + + // apply logical or to temporary unsigned long and bitmask + kernexec_mask = build_int_cstu(long_long_unsigned_type_node, 0x8000000000000000LL); +// kernexec_mask = build_int_cstu(long_long_unsigned_type_node, 0xffffffff80000000LL); + assign_intptr = gimple_build_assign(intptr, fold_build2(BIT_IOR_EXPR, long_long_unsigned_type_node, intptr, kernexec_mask)); + gsi_insert_before(gsi, assign_intptr, GSI_SAME_STMT); + update_stmt(assign_intptr); + + // cast temporary unsigned long back to a temporary fptr variable + new_fptr = create_tmp_var(TREE_TYPE(old_fptr), "kernexec_fptr"); + add_referenced_var(new_fptr); + mark_sym_for_renaming(new_fptr); + assign_new_fptr = gimple_build_assign(new_fptr, fold_convert(TREE_TYPE(old_fptr), intptr)); + gsi_insert_before(gsi, assign_new_fptr, GSI_SAME_STMT); + update_stmt(assign_new_fptr); + + // replace call stmt fn with the new fptr + gimple_call_set_fn(call_stmt, new_fptr); + update_stmt(call_stmt); +} + +static void kernexec_instrument_fptr_or(gimple_stmt_iterator *gsi) +{ + gimple asm_or_stmt, call_stmt; + tree old_fptr, new_fptr, input, output; + VEC(tree, gc) *inputs = NULL; + VEC(tree, gc) *outputs = NULL; + + call_stmt = gsi_stmt(*gsi); + old_fptr = gimple_call_fn(call_stmt); + + // create temporary fptr variable + new_fptr = create_tmp_var(TREE_TYPE(old_fptr), "kernexec_or"); + add_referenced_var(new_fptr); + mark_sym_for_renaming(new_fptr); + + // build asm volatile("orq %%r10, %0\n\t" : "=r"(new_fptr) : "0"(old_fptr)); + input = build_tree_list(NULL_TREE, build_string(2, "0")); + input = chainon(NULL_TREE, build_tree_list(input, old_fptr)); + output = build_tree_list(NULL_TREE, build_string(3, "=r")); + output = chainon(NULL_TREE, build_tree_list(output, new_fptr)); + VEC_safe_push(tree, gc, inputs, input); + VEC_safe_push(tree, gc, outputs, output); + asm_or_stmt = gimple_build_asm_vec("orq %%r10, %0\n\t", inputs, outputs, NULL, NULL); + gimple_asm_set_volatile(asm_or_stmt, true); + gsi_insert_before(gsi, asm_or_stmt, GSI_SAME_STMT); + update_stmt(asm_or_stmt); + + // replace call stmt fn with the new fptr + gimple_call_set_fn(call_stmt, new_fptr); + update_stmt(call_stmt); +} + +/* + * find all C level function pointer dereferences and forcibly set the highest bit of the pointer + */ +static unsigned int execute_kernexec_fptr(void) +{ + basic_block bb; + + // 1. loop through BBs and GIMPLE statements + FOR_EACH_BB(bb) { + gimple_stmt_iterator gsi; + + for (gsi = gsi_start_bb(bb); !gsi_end_p(gsi); gsi_next(&gsi)) { + // gimple match: h_1 = get_fptr (); D.2709_3 = h_1 (x_2(D)); + tree fn; + gimple call_stmt; + + // is it a call ... + call_stmt = gsi_stmt(gsi); + if (!is_gimple_call(call_stmt)) + continue; + fn = gimple_call_fn(call_stmt); + if (TREE_CODE(fn) == ADDR_EXPR) + continue; + if (TREE_CODE(fn) != SSA_NAME) + gcc_unreachable(); + + // ... through a function pointer + fn = SSA_NAME_VAR(fn); + if (TREE_CODE(fn) != VAR_DECL && TREE_CODE(fn) != PARM_DECL) + continue; + fn = TREE_TYPE(fn); + if (TREE_CODE(fn) != POINTER_TYPE) + continue; + fn = TREE_TYPE(fn); + if (TREE_CODE(fn) != FUNCTION_TYPE) + continue; + + kernexec_instrument_fptr(&gsi); + +//debug_tree(gimple_call_fn(call_stmt)); +//print_gimple_stmt(stderr, call_stmt, 0, TDF_LINENO); + } + } + + return 0; +} + +// add special KERNEXEC instrumentation: btsq $63,(%rsp) just before retn +static void kernexec_instrument_retaddr_bts(rtx insn) +{ + rtx btsq; + rtvec argvec, constraintvec, labelvec; + int line; + + // create asm volatile("btsq $63,(%%rsp)":::) + argvec = rtvec_alloc(0); + constraintvec = rtvec_alloc(0); + labelvec = rtvec_alloc(0); + line = expand_location(RTL_LOCATION(insn)).line; + btsq = gen_rtx_ASM_OPERANDS(VOIDmode, "btsq $63,(%%rsp)", empty_string, 0, argvec, constraintvec, labelvec, line); + MEM_VOLATILE_P(btsq) = 1; +// RTX_FRAME_RELATED_P(btsq) = 1; // not for ASM_OPERANDS + emit_insn_before(btsq, insn); +} + +// add special KERNEXEC instrumentation: orq %r10,(%rsp) just before retn +static void kernexec_instrument_retaddr_or(rtx insn) +{ + rtx orq; + rtvec argvec, constraintvec, labelvec; + int line; + + // create asm volatile("orq %%r10,(%%rsp)":::) + argvec = rtvec_alloc(0); + constraintvec = rtvec_alloc(0); + labelvec = rtvec_alloc(0); + line = expand_location(RTL_LOCATION(insn)).line; + orq = gen_rtx_ASM_OPERANDS(VOIDmode, "orq %%r10,(%%rsp)", empty_string, 0, argvec, constraintvec, labelvec, line); + MEM_VOLATILE_P(orq) = 1; +// RTX_FRAME_RELATED_P(orq) = 1; // not for ASM_OPERANDS + emit_insn_before(orq, insn); +} + +/* + * find all asm level function returns and forcibly set the highest bit of the return address + */ +static unsigned int execute_kernexec_retaddr(void) +{ + rtx insn; + + // 1. find function returns + for (insn = get_insns(); insn; insn = NEXT_INSN(insn)) { + // rtl match: (jump_insn 41 40 42 2 (return) fptr.c:42 634 {return_internal} (nil)) + // (jump_insn 12 9 11 2 (parallel [ (return) (unspec [ (0) ] UNSPEC_REP) ]) fptr.c:46 635 {return_internal_long} (nil)) + rtx body; + + // is it a retn + if (!JUMP_P(insn)) + continue; + body = PATTERN(insn); + if (GET_CODE(body) == PARALLEL) + body = XVECEXP(body, 0, 0); + if (GET_CODE(body) != RETURN) + continue; + kernexec_instrument_retaddr(insn); + } + +// print_simple_rtl(stderr, get_insns()); +// print_rtl(stderr, get_insns()); + + return 0; +} + +int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version) +{ + const char * const plugin_name = plugin_info->base_name; + const int argc = plugin_info->argc; + const struct plugin_argument * const argv = plugin_info->argv; + int i; + struct register_pass_info kernexec_reload_pass_info = { + .pass = &kernexec_reload_pass.pass, + .reference_pass_name = "ssa", + .ref_pass_instance_number = 1, + .pos_op = PASS_POS_INSERT_AFTER + }; + struct register_pass_info kernexec_fptr_pass_info = { + .pass = &kernexec_fptr_pass.pass, + .reference_pass_name = "ssa", + .ref_pass_instance_number = 1, + .pos_op = PASS_POS_INSERT_AFTER + }; + struct register_pass_info kernexec_retaddr_pass_info = { + .pass = &kernexec_retaddr_pass.pass, + .reference_pass_name = "pro_and_epilogue", + .ref_pass_instance_number = 1, + .pos_op = PASS_POS_INSERT_AFTER + }; + + if (!plugin_default_version_check(version, &gcc_version)) { + error(G_("incompatible gcc/plugin versions")); + return 1; + } + + register_callback(plugin_name, PLUGIN_INFO, NULL, &kernexec_plugin_info); + + if (TARGET_64BIT == 0) + return 0; + + for (i = 0; i < argc; ++i) { + if (!strcmp(argv[i].key, "method")) { + if (!argv[i].value) { + error(G_("no value supplied for option '-fplugin-arg-%s-%s'"), plugin_name, argv[i].key); + continue; + } + if (!strcmp(argv[i].value, "bts")) { + kernexec_instrument_fptr = kernexec_instrument_fptr_bts; + kernexec_instrument_retaddr = kernexec_instrument_retaddr_bts; + } else if (!strcmp(argv[i].value, "or")) { + kernexec_instrument_fptr = kernexec_instrument_fptr_or; + kernexec_instrument_retaddr = kernexec_instrument_retaddr_or; + fix_register("r10", 1, 1); + } else + error(G_("invalid option argument '-fplugin-arg-%s-%s=%s'"), plugin_name, argv[i].key, argv[i].value); + continue; + } + error(G_("unkown option '-fplugin-arg-%s-%s'"), plugin_name, argv[i].key); + } + if (!kernexec_instrument_fptr || !kernexec_instrument_retaddr) + error(G_("no instrumentation method was selected via '-fplugin-arg-%s-method'"), plugin_name); + + if (kernexec_instrument_fptr == kernexec_instrument_fptr_or) + register_callback(plugin_name, PLUGIN_PASS_MANAGER_SETUP, NULL, &kernexec_reload_pass_info); + register_callback(plugin_name, PLUGIN_PASS_MANAGER_SETUP, NULL, &kernexec_fptr_pass_info); + register_callback(plugin_name, PLUGIN_PASS_MANAGER_SETUP, NULL, &kernexec_retaddr_pass_info); + + return 0; +} --- tools/gcc/latent_entropy_plugin.c 1970-01-01 00:00:00.000000000 +0000 +++ tools/gcc/latent_entropy_plugin.c 2012-10-15 17:30:59.831924531 +0000 @@ -0,0 +1,295 @@ +/* + * Copyright 2012 by the PaX Team + * Licensed under the GPL v2 + * + * Note: the choice of the license means that the compilation process is + * NOT 'eligible' as defined by gcc's library exception to the GPL v3, + * but for the kernel it doesn't matter since it doesn't link against + * any of the gcc libraries + * + * gcc plugin to help generate a little bit of entropy from program state, + * used during boot in the kernel + * + * TODO: + * - add ipa pass to identify not explicitly marked candidate functions + * - mix in more program state (function arguments/return values, loop variables, etc) + * - more instrumentation control via attribute parameters + * + * BUGS: + * - LTO needs -flto-partition=none for now + */ +#include "gcc-plugin.h" +#include "config.h" +#include "system.h" +#include "coretypes.h" +#include "tree.h" +#include "tree-pass.h" +#include "flags.h" +#include "intl.h" +#include "toplev.h" +#include "plugin.h" +//#include "expr.h" where are you... +#include "diagnostic.h" +#include "plugin-version.h" +#include "tm.h" +#include "function.h" +#include "basic-block.h" +#include "gimple.h" +#include "rtl.h" +#include "emit-rtl.h" +#include "tree-flow.h" + +int plugin_is_GPL_compatible; + +static tree latent_entropy_decl; + +static struct plugin_info latent_entropy_plugin_info = { + .version = "201207271820", + .help = NULL +}; + +static unsigned int execute_latent_entropy(void); +static bool gate_latent_entropy(void); + +static struct gimple_opt_pass latent_entropy_pass = { + .pass = { + .type = GIMPLE_PASS, + .name = "latent_entropy", + .gate = gate_latent_entropy, + .execute = execute_latent_entropy, + .sub = NULL, + .next = NULL, + .static_pass_number = 0, + .tv_id = TV_NONE, + .properties_required = PROP_gimple_leh | PROP_cfg, + .properties_provided = 0, + .properties_destroyed = 0, + .todo_flags_start = 0, //TODO_verify_ssa | TODO_verify_flow | TODO_verify_stmts, + .todo_flags_finish = TODO_verify_ssa | TODO_verify_stmts | TODO_dump_func | TODO_update_ssa + } +}; + +static tree handle_latent_entropy_attribute(tree *node, tree name, tree args, int flags, bool *no_add_attrs) +{ + if (TREE_CODE(*node) != FUNCTION_DECL) { + *no_add_attrs = true; + error("%qE attribute only applies to functions", name); + } + return NULL_TREE; +} + +static struct attribute_spec latent_entropy_attr = { + .name = "latent_entropy", + .min_length = 0, + .max_length = 0, + .decl_required = true, + .type_required = false, + .function_type_required = false, + .handler = handle_latent_entropy_attribute, +#if BUILDING_GCC_VERSION >= 4007 + .affects_type_identity = false +#endif +}; + +static void register_attributes(void *event_data, void *data) +{ + register_attribute(&latent_entropy_attr); +} + +static bool gate_latent_entropy(void) +{ + tree latent_entropy_attr; + + latent_entropy_attr = lookup_attribute("latent_entropy", DECL_ATTRIBUTES(current_function_decl)); + return latent_entropy_attr != NULL_TREE; +} + +static unsigned HOST_WIDE_INT seed; +static unsigned HOST_WIDE_INT get_random_const(void) +{ + seed = (seed >> 1U) ^ (-(seed & 1ULL) & 0xD800000000000000ULL); + return seed; +} + +static enum tree_code get_op(tree *rhs) +{ + static enum tree_code op; + unsigned HOST_WIDE_INT random_const; + + random_const = get_random_const(); + + switch (op) { + case BIT_XOR_EXPR: + op = PLUS_EXPR; + break; + + case PLUS_EXPR: + if (rhs) { + op = LROTATE_EXPR; + random_const &= HOST_BITS_PER_WIDE_INT - 1; + break; + } + + case LROTATE_EXPR: + default: + op = BIT_XOR_EXPR; + break; + } + if (rhs) + *rhs = build_int_cstu(unsigned_intDI_type_node, random_const); + return op; +} + +static void perturb_local_entropy(basic_block bb, tree local_entropy) +{ + gimple_stmt_iterator gsi; + gimple assign; + tree addxorrol, rhs; + enum tree_code op; + + op = get_op(&rhs); + addxorrol = fold_build2_loc(UNKNOWN_LOCATION, op, unsigned_intDI_type_node, local_entropy, rhs); + assign = gimple_build_assign(local_entropy, addxorrol); + find_referenced_vars_in(assign); +//debug_bb(bb); + gsi = gsi_after_labels(bb); + gsi_insert_before(&gsi, assign, GSI_NEW_STMT); + update_stmt(assign); +} + +static void perturb_latent_entropy(basic_block bb, tree rhs) +{ + gimple_stmt_iterator gsi; + gimple assign; + tree addxorrol, temp; + + // 1. create temporary copy of latent_entropy + temp = create_tmp_var(unsigned_intDI_type_node, "temp_latent_entropy"); + add_referenced_var(temp); + mark_sym_for_renaming(temp); + + // 2. read... + assign = gimple_build_assign(temp, latent_entropy_decl); + find_referenced_vars_in(assign); + gsi = gsi_after_labels(bb); + gsi_insert_after(&gsi, assign, GSI_NEW_STMT); + update_stmt(assign); + + // 3. ...modify... + addxorrol = fold_build2_loc(UNKNOWN_LOCATION, get_op(NULL), unsigned_intDI_type_node, temp, rhs); + assign = gimple_build_assign(temp, addxorrol); + find_referenced_vars_in(assign); + gsi_insert_after(&gsi, assign, GSI_NEW_STMT); + update_stmt(assign); + + // 4. ...write latent_entropy + assign = gimple_build_assign(latent_entropy_decl, temp); + find_referenced_vars_in(assign); + gsi_insert_after(&gsi, assign, GSI_NEW_STMT); + update_stmt(assign); +} + +static unsigned int execute_latent_entropy(void) +{ + basic_block bb; + gimple assign; + gimple_stmt_iterator gsi; + tree local_entropy; + + if (!latent_entropy_decl) { + struct varpool_node *node; + + for (node = varpool_nodes; node; node = node->next) { + tree var = node->decl; + if (strcmp(IDENTIFIER_POINTER(DECL_NAME(var)), "latent_entropy")) + continue; + latent_entropy_decl = var; +// debug_tree(var); + break; + } + if (!latent_entropy_decl) { +// debug_tree(current_function_decl); + return 0; + } + } + +//fprintf(stderr, "latent_entropy: %s\n", IDENTIFIER_POINTER(DECL_NAME(current_function_decl))); + + // 1. create local entropy variable + local_entropy = create_tmp_var(unsigned_intDI_type_node, "local_entropy"); + add_referenced_var(local_entropy); + mark_sym_for_renaming(local_entropy); + + // 2. initialize local entropy variable + bb = split_block_after_labels(ENTRY_BLOCK_PTR)->dest; + if (dom_info_available_p(CDI_DOMINATORS)) + set_immediate_dominator(CDI_DOMINATORS, bb, ENTRY_BLOCK_PTR); + gsi = gsi_start_bb(bb); + + assign = gimple_build_assign(local_entropy, build_int_cstu(unsigned_intDI_type_node, get_random_const())); +// gimple_set_location(assign, loc); + find_referenced_vars_in(assign); + gsi_insert_after(&gsi, assign, GSI_NEW_STMT); + update_stmt(assign); + bb = bb->next_bb; + + // 3. instrument each BB with an operation on the local entropy variable + while (bb != EXIT_BLOCK_PTR) { + perturb_local_entropy(bb, local_entropy); + bb = bb->next_bb; + }; + + // 4. mix local entropy into the global entropy variable + perturb_latent_entropy(EXIT_BLOCK_PTR->prev_bb, local_entropy); + return 0; +} + +static void start_unit_callback(void *gcc_data, void *user_data) +{ +#if BUILDING_GCC_VERSION >= 4007 + seed = get_random_seed(false); +#else + sscanf(get_random_seed(false), "%" HOST_WIDE_INT_PRINT "x", &seed); + seed *= seed; +#endif + + if (in_lto_p) + return; + + // extern u64 latent_entropy + latent_entropy_decl = build_decl(UNKNOWN_LOCATION, VAR_DECL, get_identifier("latent_entropy"), unsigned_intDI_type_node); + + TREE_STATIC(latent_entropy_decl) = 1; + TREE_PUBLIC(latent_entropy_decl) = 1; + TREE_USED(latent_entropy_decl) = 1; + TREE_THIS_VOLATILE(latent_entropy_decl) = 1; + DECL_EXTERNAL(latent_entropy_decl) = 1; + DECL_ARTIFICIAL(latent_entropy_decl) = 0; + DECL_INITIAL(latent_entropy_decl) = NULL; +// DECL_ASSEMBLER_NAME(latent_entropy_decl); +// varpool_finalize_decl(latent_entropy_decl); +// varpool_mark_needed_node(latent_entropy_decl); +} + +int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version) +{ + const char * const plugin_name = plugin_info->base_name; + struct register_pass_info latent_entropy_pass_info = { + .pass = &latent_entropy_pass.pass, + .reference_pass_name = "optimized", + .ref_pass_instance_number = 1, + .pos_op = PASS_POS_INSERT_BEFORE + }; + + if (!plugin_default_version_check(version, &gcc_version)) { + error(G_("incompatible gcc/plugin versions")); + return 1; + } + + register_callback(plugin_name, PLUGIN_INFO, NULL, &latent_entropy_plugin_info); + register_callback ("start_unit", PLUGIN_START_UNIT, &start_unit_callback, NULL); + register_callback(plugin_name, PLUGIN_PASS_MANAGER_SETUP, NULL, &latent_entropy_pass_info); + register_callback(plugin_name, PLUGIN_ATTRIBUTES, register_attributes, NULL); + + return 0; +} --- tools/gcc/size_overflow_hash.data 1970-01-01 00:00:00.000000000 +0000 +++ tools/gcc/size_overflow_hash.data 2012-10-15 17:30:59.834924531 +0000 @@ -0,0 +1,3597 @@ 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your option) v3 + * + * Homepage: + * http://www.grsecurity.net/~ephox/overflow_plugin/ + * + * This plugin recomputes expressions of function arguments marked by a size_overflow attribute + * with double integer precision (DImode/TImode for 32/64 bit integer types). + * The recomputed argument is checked against TYPE_MAX and an event is logged on overflow and the triggering process is killed. + * + * Usage: + * $ gcc -I`gcc -print-file-name=plugin`/include/c-family -I`gcc -print-file-name=plugin`/include -fPIC -shared -O2 -ggdb -Wall -W -Wno-missing-field-initializers -o size_overflow_plugin.so size_overflow_plugin.c + * $ gcc -fplugin=size_overflow_plugin.so test.c -O2 + */ + +#include "gcc-plugin.h" +#include "config.h" +#include "system.h" +#include "coretypes.h" +#include "tree.h" +#include "tree-pass.h" +#include "intl.h" +#include "plugin-version.h" +#include "tm.h" +#include "toplev.h" +#include "function.h" +#include "tree-flow.h" +#include "plugin.h" +#include "gimple.h" +#include "c-common.h" +#include "diagnostic.h" +#include "cfgloop.h" + +#if BUILDING_GCC_VERSION >= 4007 +#include "c-tree.h" +#else +#define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP) +#endif + +struct size_overflow_hash { + const struct size_overflow_hash * const next; + const char * const name; + const unsigned int param; +}; + +#include "size_overflow_hash.h" + +enum marked { + MARKED_NO, MARKED_YES, MARKED_NOT_INTENTIONAL +}; + +#define __unused __attribute__((__unused__)) +#define NAME(node) IDENTIFIER_POINTER(DECL_NAME(node)) +#define NAME_LEN(node) IDENTIFIER_LENGTH(DECL_NAME(node)) +#define BEFORE_STMT true +#define AFTER_STMT false +#define CREATE_NEW_VAR NULL_TREE +#define CODES_LIMIT 32 +#define MAX_PARAM 32 +#define MY_STMT GF_PLF_1 +#define NO_CAST_CHECK GF_PLF_2 + +#if BUILDING_GCC_VERSION == 4005 +#define DECL_CHAIN(NODE) (TREE_CHAIN(DECL_MINIMAL_CHECK(NODE))) +#endif + +int plugin_is_GPL_compatible; +void debug_gimple_stmt(gimple gs); + +static tree expand(struct pointer_set_t *visited, tree lhs); +static bool pre_expand(struct pointer_set_t *visited, const_tree lhs); +static tree report_size_overflow_decl; +static const_tree const_char_ptr_type_node; +static unsigned int handle_function(void); +static void check_size_overflow(gimple stmt, tree size_overflow_type, tree cast_rhs, tree rhs, bool before); +static tree get_size_overflow_type(gimple stmt, const_tree node); +static tree dup_assign(struct pointer_set_t *visited, gimple oldstmt, tree size_overflow_type, tree rhs1, tree rhs2, tree __unused rhs3); + +static struct plugin_info size_overflow_plugin_info = { + .version = "20120930beta", + .help = "no-size-overflow\tturn off size overflow checking\n", +}; + +static tree handle_size_overflow_attribute(tree *node, tree __unused name, tree args, int __unused flags, bool *no_add_attrs) +{ + unsigned int arg_count; + enum tree_code code = TREE_CODE(*node); + + switch (code) { + case FUNCTION_DECL: + arg_count = type_num_arguments(TREE_TYPE(*node)); + break; + case FUNCTION_TYPE: + case METHOD_TYPE: + arg_count = type_num_arguments(*node); + break; + default: + *no_add_attrs = true; + error("%s: %qE attribute only applies to functions", __func__, name); + return NULL_TREE; + } + + for (; args; args = TREE_CHAIN(args)) { + tree position = TREE_VALUE(args); + if (TREE_CODE(position) != INTEGER_CST || TREE_INT_CST_HIGH(position) || TREE_INT_CST_LOW(position) < 1 || TREE_INT_CST_LOW(position) > arg_count ) { + error("%s: parameter %u is outside range.", __func__, (unsigned int)TREE_INT_CST_LOW(position)); + *no_add_attrs = true; + } + } + return NULL_TREE; +} + +static const char* get_asm_name(tree node) +{ + return IDENTIFIER_POINTER(DECL_ASSEMBLER_NAME(node)); +} + +static tree handle_intentional_overflow_attribute(tree *node, tree __unused name, tree args, int __unused flags, bool *no_add_attrs) +{ + unsigned int arg_count, arg_num; + enum tree_code code = TREE_CODE(*node); + + switch (code) { + case FUNCTION_DECL: + arg_count = type_num_arguments(TREE_TYPE(*node)); + break; + case FUNCTION_TYPE: + case METHOD_TYPE: + arg_count = type_num_arguments(*node); + break; + case FIELD_DECL: + arg_num = TREE_INT_CST_LOW(TREE_VALUE(args)); + if (arg_num != 0) { + *no_add_attrs = true; + error("%s: %qE attribute parameter can only be 0 in structure fields", __func__, name); + } + return NULL_TREE; + default: + *no_add_attrs = true; + error("%qE attribute only applies to functions", name); + return NULL_TREE; + } + + for (; args; args = TREE_CHAIN(args)) { + tree position = TREE_VALUE(args); + if (TREE_CODE(position) != INTEGER_CST || TREE_INT_CST_HIGH(position) || TREE_INT_CST_LOW(position) > arg_count ) { + error("%s: parameter %u is outside range.", __func__, (unsigned int)TREE_INT_CST_LOW(position)); + *no_add_attrs = true; + } + } + return NULL_TREE; +} + +static struct attribute_spec size_overflow_attr = { + .name = "size_overflow", + .min_length = 1, + .max_length = -1, + .decl_required = true, + .type_required = false, + .function_type_required = false, + .handler = handle_size_overflow_attribute, +#if BUILDING_GCC_VERSION >= 4007 + .affects_type_identity = false +#endif +}; + +static struct attribute_spec intentional_overflow_attr = { + .name = "intentional_overflow", + .min_length = 1, + .max_length = -1, + .decl_required = true, + .type_required = false, + .function_type_required = false, + .handler = handle_intentional_overflow_attribute, +#if BUILDING_GCC_VERSION >= 4007 + .affects_type_identity = false +#endif +}; + +static void register_attributes(void __unused *event_data, void __unused *data) +{ + register_attribute(&size_overflow_attr); + register_attribute(&intentional_overflow_attr); +} + +// http://www.team5150.com/~andrew/noncryptohashzoo2~/CrapWow.html +static unsigned int CrapWow(const char *key, unsigned int len, unsigned int seed) +{ +#define cwfold( a, b, lo, hi ) { p = (unsigned int)(a) * (unsigned long long)(b); lo ^= (unsigned int)p; hi ^= (unsigned int)(p >> 32); } +#define cwmixa( in ) { cwfold( in, m, k, h ); } +#define cwmixb( in ) { cwfold( in, n, h, k ); } + + unsigned int m = 0x57559429; + unsigned int n = 0x5052acdb; + const unsigned int *key4 = (const unsigned int *)key; + unsigned int h = len; + unsigned int k = len + seed + n; + unsigned long long p; + + while (len >= 8) { + cwmixb(key4[0]) cwmixa(key4[1]) key4 += 2; + len -= 8; + } + if (len >= 4) { + cwmixb(key4[0]) key4 += 1; + len -= 4; + } + if (len) + cwmixa(key4[0] & ((1 << (len * 8)) - 1 )); + cwmixb(h ^ (k + n)); + return k ^ h; + +#undef cwfold +#undef cwmixa +#undef cwmixb +} + +static inline unsigned int get_hash_num(const char *fndecl, const char *tree_codes, unsigned int len, unsigned int seed) +{ + unsigned int fn = CrapWow(fndecl, strlen(fndecl), seed) & 0xffff; + unsigned int codes = CrapWow(tree_codes, len, seed) & 0xffff; + return fn ^ codes; +} + +static inline tree get_original_function_decl(tree fndecl) +{ + if (DECL_ABSTRACT_ORIGIN(fndecl)) + return DECL_ABSTRACT_ORIGIN(fndecl); + return fndecl; +} + +static inline gimple get_def_stmt(const_tree node) +{ + gcc_assert(node != NULL_TREE); + gcc_assert(TREE_CODE(node) == SSA_NAME); + return SSA_NAME_DEF_STMT(node); +} + +static unsigned char get_tree_code(const_tree type) +{ + switch (TREE_CODE(type)) { + case ARRAY_TYPE: + return 0; + case BOOLEAN_TYPE: + return 1; + case ENUMERAL_TYPE: + return 2; + case FUNCTION_TYPE: + return 3; + case INTEGER_TYPE: + return 4; + case POINTER_TYPE: + return 5; + case RECORD_TYPE: + return 6; + case UNION_TYPE: + return 7; + case VOID_TYPE: + return 8; + case REAL_TYPE: + return 9; + case VECTOR_TYPE: + return 10; + case REFERENCE_TYPE: + return 11; + case OFFSET_TYPE: + return 12; + case COMPLEX_TYPE: + return 13; + default: + debug_tree((tree)type); + gcc_unreachable(); + } +} + +static size_t add_type_codes(const_tree type, unsigned char *tree_codes, size_t len) +{ + gcc_assert(type != NULL_TREE); + + while (type && len < CODES_LIMIT) { + tree_codes[len] = get_tree_code(type); + len++; + type = TREE_TYPE(type); + } + return len; +} + +static unsigned int get_function_decl(const_tree fndecl, unsigned char *tree_codes) +{ + const_tree arg, result, arg_field, type = TREE_TYPE(fndecl); + enum tree_code code = TREE_CODE(type); + size_t len = 0; + + gcc_assert(code == FUNCTION_TYPE || code == METHOD_TYPE); + + arg = TYPE_ARG_TYPES(type); + // skip builtins __builtin_constant_p + if (!arg && DECL_BUILT_IN(fndecl)) + return 0; + + if (TREE_CODE_CLASS(code) == tcc_type) + result = type; + else + result = DECL_RESULT(fndecl); + + gcc_assert(result != NULL_TREE); + len = add_type_codes(TREE_TYPE(result), tree_codes, len); + + if (arg == NULL_TREE) { + gcc_assert(CODE_CONTAINS_STRUCT(TREE_CODE(fndecl), TS_DECL_NON_COMMON)); + arg_field = DECL_ARGUMENT_FLD(fndecl); + if (arg_field == NULL_TREE) + return 0; + arg = TREE_TYPE(arg_field); + len = add_type_codes(arg, tree_codes, len); + gcc_assert(len != 0); + return len; + } + + gcc_assert(arg != NULL_TREE && TREE_CODE(arg) == TREE_LIST); + while (arg && len < CODES_LIMIT) { + len = add_type_codes(TREE_VALUE(arg), tree_codes, len); + arg = TREE_CHAIN(arg); + } + + gcc_assert(len != 0); + return len; +} + +static const struct size_overflow_hash *get_function_hash(tree fndecl) +{ + unsigned int hash; + const struct size_overflow_hash *entry; + unsigned char tree_codes[CODES_LIMIT]; + size_t len; + const char *func_name = get_asm_name(fndecl); + + len = get_function_decl(fndecl, tree_codes); + if (len == 0) + return NULL; + + hash = get_hash_num(func_name, (const char*) tree_codes, len, 0); + + entry = size_overflow_hash[hash]; + while (entry) { + if (!strcmp(entry->name, func_name)) + return entry; + entry = entry->next; + } + + return NULL; +} + +static void check_arg_type(const_tree arg) +{ + const_tree type = TREE_TYPE(arg); + enum tree_code code = TREE_CODE(type); + + gcc_assert(code == INTEGER_TYPE || code == ENUMERAL_TYPE || + (code == POINTER_TYPE && TREE_CODE(TREE_TYPE(type)) == VOID_TYPE) || + (code == POINTER_TYPE && TREE_CODE(TREE_TYPE(type)) == INTEGER_TYPE)); +} + +static int find_arg_number(const_tree arg, tree func) +{ + tree var; + unsigned int argnum = 1; + + if (TREE_CODE(arg) == SSA_NAME) + arg = SSA_NAME_VAR(arg); + + for (var = DECL_ARGUMENTS(func); var; var = TREE_CHAIN(var)) { + if (strcmp(NAME(arg), NAME(var))) { + argnum++; + continue; + } + check_arg_type(var); + return argnum; + } + gcc_unreachable(); +} + +static tree create_new_var(tree type) +{ + tree new_var = create_tmp_var(type, "cicus"); + + add_referenced_var(new_var); + mark_sym_for_renaming(new_var); + return new_var; +} + +static gimple create_binary_assign(enum tree_code code, gimple stmt, tree rhs1, tree rhs2) +{ + gimple assign; + gimple_stmt_iterator gsi = gsi_for_stmt(stmt); + tree type = TREE_TYPE(rhs1); + tree lhs = create_new_var(type); + + assign = gimple_build_assign_with_ops(code, lhs, rhs1, rhs2); + gimple_set_lhs(assign, make_ssa_name(lhs, assign)); + + gsi_insert_before(&gsi, assign, GSI_NEW_STMT); + update_stmt(assign); + gimple_set_plf(assign, MY_STMT, true); + return assign; +} + +static bool is_bool(const_tree node) +{ + const_tree type; + + if (node == NULL_TREE) + return false; + + type = TREE_TYPE(node); + if (!INTEGRAL_TYPE_P(type)) + return false; + if (TREE_CODE(type) == BOOLEAN_TYPE) + return true; + if (TYPE_PRECISION(type) == 1) + return true; + return false; +} + +static tree cast_a_tree(tree type, tree var) +{ + gcc_assert(type != NULL_TREE); + gcc_assert(var != NULL_TREE); + gcc_assert(fold_convertible_p(type, var)); + + return fold_convert(type, var); +} + +static gimple build_cast_stmt(tree dst_type, tree rhs, tree lhs, gimple_stmt_iterator *gsi, bool before) +{ + gimple assign; + + gcc_assert(dst_type != NULL_TREE && rhs != NULL_TREE); + if (gsi_end_p(*gsi) && before == AFTER_STMT) + gcc_unreachable(); + + if (lhs == CREATE_NEW_VAR) + lhs = create_new_var(dst_type); + + assign = gimple_build_assign(lhs, cast_a_tree(dst_type, rhs)); + + if (!gsi_end_p(*gsi)) { + location_t loc = gimple_location(gsi_stmt(*gsi)); + gimple_set_location(assign, loc); + } + + gimple_set_lhs(assign, make_ssa_name(lhs, assign)); + + if (before) + gsi_insert_before(gsi, assign, GSI_NEW_STMT); + else + gsi_insert_after(gsi, assign, GSI_NEW_STMT); + update_stmt(assign); + gimple_set_plf(assign, MY_STMT, true); + + return assign; +} + +static tree cast_to_new_size_overflow_type(gimple stmt, tree new_rhs1, tree size_overflow_type, bool before) +{ + const_gimple assign; + gimple_stmt_iterator gsi; + + if (new_rhs1 == NULL_TREE) + return NULL_TREE; + + if (!useless_type_conversion_p(TREE_TYPE(new_rhs1), size_overflow_type)) { + gsi = gsi_for_stmt(stmt); + assign = build_cast_stmt(size_overflow_type, new_rhs1, CREATE_NEW_VAR, &gsi, before); + return gimple_get_lhs(assign); + } + return new_rhs1; +} + +static tree follow_overflow_type_and_dup(struct pointer_set_t *visited, gimple stmt, const_tree node, tree new_rhs1, tree new_rhs2, tree new_rhs3) +{ + tree size_overflow_type = get_size_overflow_type(stmt, node); + + new_rhs1 = cast_to_new_size_overflow_type(stmt, new_rhs1, size_overflow_type, BEFORE_STMT); + + if (new_rhs2 != NULL_TREE) + new_rhs2 = cast_to_new_size_overflow_type(stmt, new_rhs2, size_overflow_type, BEFORE_STMT); + + if (new_rhs3 != NULL_TREE) + new_rhs3 = cast_to_new_size_overflow_type(stmt, new_rhs3, size_overflow_type, BEFORE_STMT); + + return dup_assign(visited, stmt, size_overflow_type, new_rhs1, new_rhs2, new_rhs3); +} + + +static tree create_assign(struct pointer_set_t *visited, gimple oldstmt, tree rhs1, bool before) +{ + tree size_overflow_type, lhs; + gimple stmt; + gimple_stmt_iterator gsi; + + if (rhs1 == NULL_TREE) { + debug_gimple_stmt(oldstmt); + error("%s: rhs1 is NULL_TREE", __func__); + gcc_unreachable(); + } + + if (gimple_code(oldstmt) == GIMPLE_ASM) + lhs = rhs1; + else + lhs = gimple_get_lhs(oldstmt); + + gsi = gsi_for_stmt(oldstmt); + pointer_set_insert(visited, oldstmt); + if (lookup_stmt_eh_lp(oldstmt) != 0) { + basic_block next_bb, cur_bb; + const_edge e; + + gcc_assert(before == false); + gcc_assert(stmt_can_throw_internal(oldstmt)); + gcc_assert(gimple_code(oldstmt) == GIMPLE_CALL); + gcc_assert(!gsi_end_p(gsi)); + + cur_bb = gimple_bb(oldstmt); + next_bb = cur_bb->next_bb; + e = find_edge(cur_bb, next_bb); + gcc_assert(e != NULL); + gcc_assert(e->flags & EDGE_FALLTHRU); + + gsi = gsi_after_labels(next_bb); + gcc_assert(!gsi_end_p(gsi)); + + before = true; + oldstmt = gsi_stmt(gsi); + } + + size_overflow_type = get_size_overflow_type(oldstmt, lhs); + + stmt = build_cast_stmt(size_overflow_type, rhs1, CREATE_NEW_VAR, &gsi, before); + gimple_set_plf(stmt, MY_STMT, true); + return gimple_get_lhs(stmt); +} + +static tree dup_assign(struct pointer_set_t *visited, gimple oldstmt, tree size_overflow_type, tree rhs1, tree rhs2, tree __unused rhs3) +{ + gimple stmt; + gimple_stmt_iterator gsi; + tree new_var, lhs = gimple_get_lhs(oldstmt); + + if (gimple_plf(oldstmt, MY_STMT)) + return lhs; + + if (gimple_num_ops(oldstmt) != 4 && rhs1 == NULL_TREE) { + rhs1 = gimple_assign_rhs1(oldstmt); + rhs1 = create_assign(visited, oldstmt, rhs1, BEFORE_STMT); + } + if (gimple_num_ops(oldstmt) == 3 && rhs2 == NULL_TREE) { + rhs2 = gimple_assign_rhs2(oldstmt); + rhs2 = create_assign(visited, oldstmt, rhs2, BEFORE_STMT); + } + + stmt = gimple_copy(oldstmt); + gimple_set_location(stmt, gimple_location(oldstmt)); + gimple_set_plf(stmt, MY_STMT, true); + + if (gimple_assign_rhs_code(oldstmt) == WIDEN_MULT_EXPR) + gimple_assign_set_rhs_code(stmt, MULT_EXPR); + + if (is_bool(lhs)) + new_var = SSA_NAME_VAR(lhs); + else + new_var = create_new_var(size_overflow_type); + new_var = make_ssa_name(new_var, stmt); + gimple_set_lhs(stmt, new_var); + + if (rhs1 != NULL_TREE) { + if (!gimple_assign_cast_p(oldstmt)) + rhs1 = cast_a_tree(size_overflow_type, rhs1); + gimple_assign_set_rhs1(stmt, rhs1); + } + + if (rhs2 != NULL_TREE) + gimple_assign_set_rhs2(stmt, rhs2); +#if BUILDING_GCC_VERSION >= 4007 + if (rhs3 != NULL_TREE) + gimple_assign_set_rhs3(stmt, rhs3); +#endif + gimple_set_vuse(stmt, gimple_vuse(oldstmt)); + gimple_set_vdef(stmt, gimple_vdef(oldstmt)); + + gsi = gsi_for_stmt(oldstmt); + gsi_insert_after(&gsi, stmt, GSI_SAME_STMT); + update_stmt(stmt); + pointer_set_insert(visited, oldstmt); + return gimple_get_lhs(stmt); +} + +static gimple overflow_create_phi_node(gimple oldstmt, tree result) +{ + basic_block bb; + gimple phi; + gimple_stmt_iterator gsi = gsi_for_stmt(oldstmt); + + bb = gsi_bb(gsi); + + phi = create_phi_node(result, bb); + gsi = gsi_last(phi_nodes(bb)); + gsi_remove(&gsi, false); + + gsi = gsi_for_stmt(oldstmt); + gsi_insert_after(&gsi, phi, GSI_NEW_STMT); + gimple_set_bb(phi, bb); + gimple_set_plf(phi, MY_STMT, true); + return phi; +} + +static basic_block create_a_first_bb(void) +{ + basic_block first_bb; + + first_bb = split_block_after_labels(ENTRY_BLOCK_PTR)->dest; + if (dom_info_available_p(CDI_DOMINATORS)) + set_immediate_dominator(CDI_DOMINATORS, first_bb, ENTRY_BLOCK_PTR); + return first_bb; +} + +static tree cast_old_phi_arg(gimple oldstmt, tree size_overflow_type, tree arg, tree new_var, unsigned int i) +{ + basic_block bb; + const_gimple newstmt; + gimple_stmt_iterator gsi; + bool before = BEFORE_STMT; + + if (TREE_CODE(arg) == SSA_NAME && gimple_code(get_def_stmt(arg)) != GIMPLE_NOP) { + gsi = gsi_for_stmt(get_def_stmt(arg)); + newstmt = build_cast_stmt(size_overflow_type, arg, new_var, &gsi, AFTER_STMT); + return gimple_get_lhs(newstmt); + } + + bb = gimple_phi_arg_edge(oldstmt, i)->src; + gsi = gsi_after_labels(bb); + if (bb->index == 0) { + bb = create_a_first_bb(); + gsi = gsi_start_bb(bb); + } + newstmt = build_cast_stmt(size_overflow_type, arg, new_var, &gsi, before); + return gimple_get_lhs(newstmt); +} + +static const_gimple handle_new_phi_arg(const_tree arg, tree new_var, tree new_rhs) +{ + gimple newstmt; + gimple_stmt_iterator gsi; + void (*gsi_insert)(gimple_stmt_iterator *, gimple, enum gsi_iterator_update); + gimple def_newstmt = get_def_stmt(new_rhs); + + gsi_insert = gsi_insert_after; + gsi = gsi_for_stmt(def_newstmt); + + switch (gimple_code(get_def_stmt(arg))) { + case GIMPLE_PHI: + newstmt = gimple_build_assign(new_var, new_rhs); + gsi = gsi_after_labels(gimple_bb(def_newstmt)); + gsi_insert = gsi_insert_before; + break; + case GIMPLE_ASM: + case GIMPLE_CALL: + newstmt = gimple_build_assign(new_var, new_rhs); + break; + case GIMPLE_ASSIGN: + newstmt = gimple_build_assign(new_var, gimple_get_lhs(def_newstmt)); + break; + default: + /* unknown gimple_code (handle_build_new_phi_arg) */ + gcc_unreachable(); + } + + gimple_set_lhs(newstmt, make_ssa_name(new_var, newstmt)); + gsi_insert(&gsi, newstmt, GSI_NEW_STMT); + gimple_set_plf(newstmt, MY_STMT, true); + update_stmt(newstmt); + return newstmt; +} + +static tree build_new_phi_arg(struct pointer_set_t *visited, tree size_overflow_type, tree arg, tree new_var) +{ + const_gimple newstmt; + gimple def_stmt; + tree new_rhs; + + new_rhs = expand(visited, arg); + if (new_rhs == NULL_TREE) + return NULL_TREE; + + def_stmt = get_def_stmt(new_rhs); + if (gimple_code(def_stmt) == GIMPLE_NOP) + return NULL_TREE; + new_rhs = cast_to_new_size_overflow_type(def_stmt, new_rhs, size_overflow_type, AFTER_STMT); + + newstmt = handle_new_phi_arg(arg, new_var, new_rhs); + return gimple_get_lhs(newstmt); +} + +static tree build_new_phi(struct pointer_set_t *visited, tree orig_result) +{ + gimple phi, oldstmt = get_def_stmt(orig_result); + tree new_result, size_overflow_type; + unsigned int i; + unsigned int n = gimple_phi_num_args(oldstmt); + + size_overflow_type = get_size_overflow_type(oldstmt, orig_result); + + new_result = create_new_var(size_overflow_type); + + pointer_set_insert(visited, oldstmt); + phi = overflow_create_phi_node(oldstmt, new_result); + for (i = 0; i < n; i++) { + tree arg, lhs; + + arg = gimple_phi_arg_def(oldstmt, i); + if (is_gimple_constant(arg)) + arg = cast_a_tree(size_overflow_type, arg); + lhs = build_new_phi_arg(visited, size_overflow_type, arg, new_result); + if (lhs == NULL_TREE) + lhs = cast_old_phi_arg(oldstmt, size_overflow_type, arg, new_result, i); + add_phi_arg(phi, lhs, gimple_phi_arg_edge(oldstmt, i), gimple_location(oldstmt)); + } + + update_stmt(phi); + return gimple_phi_result(phi); +} + +static tree change_assign_rhs(gimple stmt, const_tree orig_rhs, tree new_rhs) +{ + const_gimple assign; + gimple_stmt_iterator gsi = gsi_for_stmt(stmt); + tree origtype = TREE_TYPE(orig_rhs); + + gcc_assert(gimple_code(stmt) == GIMPLE_ASSIGN); + + assign = build_cast_stmt(origtype, new_rhs, CREATE_NEW_VAR, &gsi, BEFORE_STMT); + return gimple_get_lhs(assign); +} + +static void change_rhs1(gimple stmt, tree new_rhs1) +{ + tree assign_rhs; + const_tree rhs = gimple_assign_rhs1(stmt); + + assign_rhs = change_assign_rhs(stmt, rhs, new_rhs1); + gimple_assign_set_rhs1(stmt, assign_rhs); + update_stmt(stmt); +} + +static bool check_mode_type(const_gimple stmt) +{ + const_tree lhs = gimple_get_lhs(stmt); + const_tree lhs_type = TREE_TYPE(lhs); + const_tree rhs_type = TREE_TYPE(gimple_assign_rhs1(stmt)); + enum machine_mode lhs_mode = TYPE_MODE(lhs_type); + enum machine_mode rhs_mode = TYPE_MODE(rhs_type); + + if (rhs_mode == lhs_mode && TYPE_UNSIGNED(rhs_type) == TYPE_UNSIGNED(lhs_type)) + return false; + + if (rhs_mode == SImode && lhs_mode == DImode && (TYPE_UNSIGNED(rhs_type) || !TYPE_UNSIGNED(lhs_type))) + return false; + + return true; +} + +static bool check_undefined_integer_operation(const_gimple stmt) +{ + const_gimple def_stmt; + const_tree lhs = gimple_get_lhs(stmt); + const_tree rhs1 = gimple_assign_rhs1(stmt); + const_tree rhs1_type = TREE_TYPE(rhs1); + const_tree lhs_type = TREE_TYPE(lhs); + + if (TYPE_MODE(rhs1_type) != TYPE_MODE(lhs_type) || TYPE_UNSIGNED(rhs1_type) == TYPE_UNSIGNED(lhs_type)) + return false; + + def_stmt = get_def_stmt(rhs1); + if (gimple_code(def_stmt) != GIMPLE_ASSIGN) + return false; + + if (gimple_assign_rhs_code(def_stmt) != MINUS_EXPR) + return false; + return true; +} + +static bool is_a_cast_and_const_overflow(const_tree no_const_rhs) +{ + const_tree rhs1, lhs, rhs1_type, lhs_type; + enum machine_mode lhs_mode, rhs_mode; + gimple def_stmt = get_def_stmt(no_const_rhs); + + if (!gimple_assign_cast_p(def_stmt)) + return false; + + rhs1 = gimple_assign_rhs1(def_stmt); + lhs = gimple_get_lhs(def_stmt); + rhs1_type = TREE_TYPE(rhs1); + lhs_type = TREE_TYPE(lhs); + rhs_mode = TYPE_MODE(rhs1_type); + lhs_mode = TYPE_MODE(lhs_type); + if (TYPE_UNSIGNED(lhs_type) == TYPE_UNSIGNED(rhs1_type) || lhs_mode != rhs_mode) + return false; + + return true; +} + +static tree handle_unary_rhs(struct pointer_set_t *visited, gimple stmt) +{ + tree size_overflow_type, lhs = gimple_get_lhs(stmt); + tree new_rhs1, rhs1 = gimple_assign_rhs1(stmt); + const_tree rhs1_type = TREE_TYPE(rhs1); + const_tree lhs_type = TREE_TYPE(lhs); + + new_rhs1 = expand(visited, rhs1); + + if (new_rhs1 == NULL_TREE || TREE_CODE(rhs1_type) == POINTER_TYPE) + return create_assign(visited, stmt, lhs, AFTER_STMT); + + if (gimple_plf(stmt, MY_STMT)) + return lhs; + + if (gimple_plf(stmt, NO_CAST_CHECK)) + return follow_overflow_type_and_dup(visited, stmt, rhs1, new_rhs1, NULL_TREE, NULL_TREE); + + if (gimple_assign_rhs_code(stmt) == BIT_NOT_EXPR) { + size_overflow_type = get_size_overflow_type(stmt, rhs1); + new_rhs1 = cast_to_new_size_overflow_type(stmt, new_rhs1, size_overflow_type, BEFORE_STMT); + check_size_overflow(stmt, size_overflow_type, new_rhs1, rhs1, BEFORE_STMT); + return create_assign(visited, stmt, lhs, AFTER_STMT); + } + + if (!gimple_assign_cast_p(stmt) || check_undefined_integer_operation(stmt)) + return follow_overflow_type_and_dup(visited, stmt, lhs, new_rhs1, NULL_TREE, NULL_TREE); + + size_overflow_type = get_size_overflow_type(stmt, rhs1); + new_rhs1 = cast_to_new_size_overflow_type(stmt, new_rhs1, size_overflow_type, BEFORE_STMT); + + change_rhs1(stmt, new_rhs1); + check_size_overflow(stmt, size_overflow_type, new_rhs1, rhs1, BEFORE_STMT); + + rhs1 = gimple_assign_rhs1(stmt); + rhs1_type = TREE_TYPE(rhs1); + if (TYPE_UNSIGNED(rhs1_type) != TYPE_UNSIGNED(lhs_type)) + return create_assign(visited, stmt, rhs1, AFTER_STMT); + + if (!check_mode_type(stmt)) + return create_assign(visited, stmt, lhs, AFTER_STMT); + + size_overflow_type = get_size_overflow_type(stmt, lhs); + new_rhs1 = cast_to_new_size_overflow_type(stmt, new_rhs1, size_overflow_type, BEFORE_STMT); + + check_size_overflow(stmt, size_overflow_type, new_rhs1, lhs, BEFORE_STMT); + + return create_assign(visited, stmt, lhs, AFTER_STMT); +} + +static tree handle_unary_ops(struct pointer_set_t *visited, tree lhs) +{ + gimple def_stmt = get_def_stmt(lhs); + tree rhs1 = gimple_assign_rhs1(def_stmt); + + if (is_gimple_constant(rhs1)) + return create_assign(visited, def_stmt, lhs, AFTER_STMT); + + gcc_assert(TREE_CODE(rhs1) != COND_EXPR); + switch (TREE_CODE(rhs1)) { + case SSA_NAME: + return handle_unary_rhs(visited, def_stmt); + case ARRAY_REF: + case BIT_FIELD_REF: + case ADDR_EXPR: + case COMPONENT_REF: + case INDIRECT_REF: +#if BUILDING_GCC_VERSION >= 4006 + case MEM_REF: +#endif + case PARM_DECL: + case TARGET_MEM_REF: + case VAR_DECL: + return create_assign(visited, def_stmt, lhs, AFTER_STMT); + + default: + debug_gimple_stmt(def_stmt); + debug_tree(rhs1); + gcc_unreachable(); + } +} + +static void insert_cond(basic_block cond_bb, tree arg, enum tree_code cond_code, tree type_value) +{ + gimple cond_stmt; + gimple_stmt_iterator gsi = gsi_last_bb(cond_bb); + + cond_stmt = gimple_build_cond(cond_code, arg, type_value, NULL_TREE, NULL_TREE); + gsi_insert_after(&gsi, cond_stmt, GSI_CONTINUE_LINKING); + update_stmt(cond_stmt); +} + +static tree create_string_param(tree string) +{ + tree i_type, a_type; + const int length = TREE_STRING_LENGTH(string); + + gcc_assert(length > 0); + + i_type = build_index_type(build_int_cst(NULL_TREE, length - 1)); + a_type = build_array_type(char_type_node, i_type); + + TREE_TYPE(string) = a_type; + TREE_CONSTANT(string) = 1; + TREE_READONLY(string) = 1; + + return build1(ADDR_EXPR, ptr_type_node, string); +} + +static void insert_cond_result(basic_block bb_true, const_gimple stmt, const_tree arg, bool min) +{ + gimple func_stmt; + const_gimple def_stmt; + const_tree loc_line; + tree loc_file, ssa_name, current_func; + expanded_location xloc; + char ssa_name_buf[256]; + gimple_stmt_iterator gsi = gsi_start_bb(bb_true); + + def_stmt = get_def_stmt(arg); + xloc = expand_location(gimple_location(def_stmt)); + + if (!gimple_has_location(def_stmt)) { + xloc = expand_location(gimple_location(stmt)); + if (!gimple_has_location(stmt)) + xloc = expand_location(DECL_SOURCE_LOCATION(current_function_decl)); + } + + loc_line = build_int_cstu(unsigned_type_node, xloc.line); + + loc_file = build_string(strlen(xloc.file) + 1, xloc.file); + loc_file = create_string_param(loc_file); + + current_func = build_string(NAME_LEN(current_function_decl) + 1, NAME(current_function_decl)); + current_func = create_string_param(current_func); + + snprintf(ssa_name_buf, 256, "%s_%u (%s)\n", NAME(SSA_NAME_VAR(arg)), SSA_NAME_VERSION(arg), min ? "min" : "max"); + ssa_name = build_string(256, ssa_name_buf); + ssa_name = create_string_param(ssa_name); + + // void report_size_overflow(const char *file, unsigned int line, const char *func, const char *ssa_name) + func_stmt = gimple_build_call(report_size_overflow_decl, 4, loc_file, loc_line, current_func, ssa_name); + + gsi_insert_after(&gsi, func_stmt, GSI_CONTINUE_LINKING); +} + +static void __unused print_the_code_insertions(const_gimple stmt) +{ + location_t loc = gimple_location(stmt); + + inform(loc, "Integer size_overflow check applied here."); +} + +static void insert_check_size_overflow(gimple stmt, enum tree_code cond_code, tree arg, tree type_value, bool before, bool min) +{ + basic_block cond_bb, join_bb, bb_true; + edge e; + gimple_stmt_iterator gsi = gsi_for_stmt(stmt); + + cond_bb = gimple_bb(stmt); + if (before) + gsi_prev(&gsi); + if (gsi_end_p(gsi)) + e = split_block_after_labels(cond_bb); + else + e = split_block(cond_bb, gsi_stmt(gsi)); + cond_bb = e->src; + join_bb = e->dest; + e->flags = EDGE_FALSE_VALUE; + e->probability = REG_BR_PROB_BASE; + + bb_true = create_empty_bb(cond_bb); + make_edge(cond_bb, bb_true, EDGE_TRUE_VALUE); + make_edge(cond_bb, join_bb, EDGE_FALSE_VALUE); + make_edge(bb_true, join_bb, EDGE_FALLTHRU); + + if (dom_info_available_p(CDI_DOMINATORS)) { + set_immediate_dominator(CDI_DOMINATORS, bb_true, cond_bb); + set_immediate_dominator(CDI_DOMINATORS, join_bb, cond_bb); + } + + if (current_loops != NULL) { + gcc_assert(cond_bb->loop_father == join_bb->loop_father); + add_bb_to_loop(bb_true, cond_bb->loop_father); + } + + insert_cond(cond_bb, arg, cond_code, type_value); + insert_cond_result(bb_true, stmt, arg, min); + +// print_the_code_insertions(stmt); +} + +static void check_size_overflow(gimple stmt, tree size_overflow_type, tree cast_rhs, tree rhs, bool before) +{ + const_tree rhs_type = TREE_TYPE(rhs); + tree cast_rhs_type, type_max_type, type_min_type, type_max, type_min; + + gcc_assert(rhs_type != NULL_TREE); + if (TREE_CODE(rhs_type) == POINTER_TYPE) + return; + + gcc_assert(TREE_CODE(rhs_type) == INTEGER_TYPE || TREE_CODE(rhs_type) == BOOLEAN_TYPE || TREE_CODE(rhs_type) == ENUMERAL_TYPE); + + type_max = cast_a_tree(size_overflow_type, TYPE_MAX_VALUE(rhs_type)); + type_min = cast_a_tree(size_overflow_type, TYPE_MIN_VALUE(rhs_type)); + + gcc_assert(!TREE_OVERFLOW(type_max)); + + cast_rhs_type = TREE_TYPE(cast_rhs); + type_max_type = TREE_TYPE(type_max); + type_min_type = TREE_TYPE(type_min); + gcc_assert(useless_type_conversion_p(cast_rhs_type, type_max_type)); + gcc_assert(useless_type_conversion_p(type_max_type, type_min_type)); + + insert_check_size_overflow(stmt, GT_EXPR, cast_rhs, type_max, before, false); + insert_check_size_overflow(stmt, LT_EXPR, cast_rhs, type_min, before, true); +} + +static tree get_size_overflow_type_for_intentional_overflow(gimple def_stmt, tree change_rhs) +{ + gimple change_rhs_def_stmt; + tree lhs = gimple_get_lhs(def_stmt); + tree lhs_type = TREE_TYPE(lhs); + tree rhs1_type = TREE_TYPE(gimple_assign_rhs1(def_stmt)); + tree rhs2_type = TREE_TYPE(gimple_assign_rhs2(def_stmt)); + + if (change_rhs == NULL_TREE) + return get_size_overflow_type(def_stmt, lhs); + + change_rhs_def_stmt = get_def_stmt(change_rhs); + + if (TREE_CODE_CLASS(gimple_assign_rhs_code(def_stmt)) == tcc_comparison) + return get_size_overflow_type(change_rhs_def_stmt, change_rhs); + + if (gimple_assign_rhs_code(def_stmt) == LSHIFT_EXPR) + return get_size_overflow_type(change_rhs_def_stmt, change_rhs); + + if (gimple_assign_rhs_code(def_stmt) == RSHIFT_EXPR) + return get_size_overflow_type(change_rhs_def_stmt, change_rhs); + + if (!useless_type_conversion_p(lhs_type, rhs1_type) || !useless_type_conversion_p(rhs1_type, rhs2_type)) { + debug_gimple_stmt(def_stmt); + gcc_unreachable(); + } + + return get_size_overflow_type(def_stmt, lhs); +} + +static bool is_a_constant_overflow(const_gimple stmt, const_tree rhs) +{ + if (gimple_assign_rhs_code(stmt) == MIN_EXPR) + return false; + if (!is_gimple_constant(rhs)) + return false; + return true; +} + +static tree get_cast_def_stmt_rhs(const_tree new_rhs) +{ + gimple def_stmt; + + def_stmt = get_def_stmt(new_rhs); + // get_size_overflow_type + if (LONG_TYPE_SIZE != GET_MODE_BITSIZE(SImode)) + gcc_assert(gimple_assign_cast_p(def_stmt)); + return gimple_assign_rhs1(def_stmt); +} + +static tree cast_to_int_TI_type_and_check(gimple stmt, tree new_rhs) +{ + gimple_stmt_iterator gsi; + const_gimple cast_stmt; + gimple def_stmt; + enum machine_mode mode = TYPE_MODE(TREE_TYPE(new_rhs)); + + if (mode != TImode && mode != DImode) { + def_stmt = get_def_stmt(new_rhs); + gcc_assert(gimple_assign_cast_p(def_stmt)); + new_rhs = gimple_assign_rhs1(def_stmt); + mode = TYPE_MODE(TREE_TYPE(new_rhs)); + } + + gcc_assert(mode == TImode || mode == DImode); + + if (mode == TYPE_MODE(intTI_type_node) && useless_type_conversion_p(TREE_TYPE(new_rhs), intTI_type_node)) + return new_rhs; + + gsi = gsi_for_stmt(stmt); + cast_stmt = build_cast_stmt(intTI_type_node, new_rhs, CREATE_NEW_VAR, &gsi, BEFORE_STMT); + new_rhs = gimple_get_lhs(cast_stmt); + + if (mode == DImode) + return new_rhs; + + check_size_overflow(stmt, intTI_type_node, new_rhs, new_rhs, BEFORE_STMT); + + return new_rhs; +} + +static bool is_an_integer_trunction(const_gimple stmt) +{ + gimple rhs1_def_stmt, rhs2_def_stmt; + const_tree rhs1_def_stmt_rhs1, rhs2_def_stmt_rhs1; + enum machine_mode rhs1_def_stmt_rhs1_mode, rhs2_def_stmt_rhs1_mode; + const_tree rhs1 = gimple_assign_rhs1(stmt); + const_tree rhs2 = gimple_assign_rhs2(stmt); + enum machine_mode rhs1_mode = TYPE_MODE(TREE_TYPE(rhs1)); + enum machine_mode rhs2_mode = TYPE_MODE(TREE_TYPE(rhs2)); + + if (is_gimple_constant(rhs1) || is_gimple_constant(rhs2)) + return false; + + gcc_assert(TREE_CODE(rhs1) == SSA_NAME && TREE_CODE(rhs2) == SSA_NAME); + + if (gimple_assign_rhs_code(stmt) != MINUS_EXPR || rhs1_mode != SImode || rhs2_mode != SImode) + return false; + + rhs1_def_stmt = get_def_stmt(rhs1); + rhs2_def_stmt = get_def_stmt(rhs2); + if (!gimple_assign_cast_p(rhs1_def_stmt) || !gimple_assign_cast_p(rhs2_def_stmt)) + return false; + + rhs1_def_stmt_rhs1 = gimple_assign_rhs1(rhs1_def_stmt); + rhs2_def_stmt_rhs1 = gimple_assign_rhs1(rhs2_def_stmt); + rhs1_def_stmt_rhs1_mode = TYPE_MODE(TREE_TYPE(rhs1_def_stmt_rhs1)); + rhs2_def_stmt_rhs1_mode = TYPE_MODE(TREE_TYPE(rhs2_def_stmt_rhs1)); + if (rhs1_def_stmt_rhs1_mode != DImode || rhs2_def_stmt_rhs1_mode != DImode) + return false; + + gimple_set_plf(rhs1_def_stmt, NO_CAST_CHECK, true); + gimple_set_plf(rhs2_def_stmt, NO_CAST_CHECK, true); + return true; +} + +static tree handle_integer_truncation(struct pointer_set_t *visited, const_tree lhs) +{ + tree new_rhs1, new_rhs2; + tree new_rhs1_def_stmt_rhs1, new_rhs2_def_stmt_rhs1, new_lhs; + tree new_rhs1_def_stmt_rhs1_type, new_rhs2_def_stmt_rhs1_type; + gimple assign, stmt = get_def_stmt(lhs); + tree rhs1 = gimple_assign_rhs1(stmt); + tree rhs2 = gimple_assign_rhs2(stmt); + + if (!is_an_integer_trunction(stmt)) + return NULL_TREE; + + new_rhs1 = expand(visited, rhs1); + new_rhs2 = expand(visited, rhs2); + + new_rhs1_def_stmt_rhs1 = get_cast_def_stmt_rhs(new_rhs1); + new_rhs2_def_stmt_rhs1 = get_cast_def_stmt_rhs(new_rhs2); + + new_rhs1_def_stmt_rhs1_type = TREE_TYPE(new_rhs1_def_stmt_rhs1); + new_rhs2_def_stmt_rhs1_type = TREE_TYPE(new_rhs2_def_stmt_rhs1); + + if (!useless_type_conversion_p(new_rhs1_def_stmt_rhs1_type, new_rhs2_def_stmt_rhs1_type)) { + new_rhs1_def_stmt_rhs1 = cast_to_int_TI_type_and_check(stmt, new_rhs1_def_stmt_rhs1); + new_rhs2_def_stmt_rhs1 = cast_to_int_TI_type_and_check(stmt, new_rhs2_def_stmt_rhs1); + } + + assign = create_binary_assign(MINUS_EXPR, stmt, new_rhs1_def_stmt_rhs1, new_rhs2_def_stmt_rhs1); + new_lhs = gimple_get_lhs(assign); + check_size_overflow(assign, TREE_TYPE(new_lhs), new_lhs, rhs1, AFTER_STMT); + + return follow_overflow_type_and_dup(visited, stmt, lhs, new_rhs1, new_rhs2, NULL_TREE); +} + +static bool is_a_neg_overflow(const_gimple stmt, const_tree rhs) +{ + const_gimple def_stmt; + + if (TREE_CODE(rhs) != SSA_NAME) + return false; + + if (gimple_assign_rhs_code(stmt) != PLUS_EXPR) + return false; + + def_stmt = get_def_stmt(rhs); + if (gimple_code(def_stmt) != GIMPLE_ASSIGN || gimple_assign_rhs_code(def_stmt) != BIT_NOT_EXPR) + return false; + + return true; +} + +static tree handle_intentional_overflow(struct pointer_set_t *visited, bool check_overflow, gimple stmt, tree change_rhs, tree new_rhs1, tree new_rhs2) +{ + tree new_rhs, size_overflow_type, orig_rhs; + void (*gimple_assign_set_rhs)(gimple, tree); + tree rhs1 = gimple_assign_rhs1(stmt); + tree rhs2 = gimple_assign_rhs2(stmt); + tree lhs = gimple_get_lhs(stmt); + + if (change_rhs == NULL_TREE) + return create_assign(visited, stmt, lhs, AFTER_STMT); + + if (new_rhs2 == NULL_TREE) { + size_overflow_type = get_size_overflow_type_for_intentional_overflow(stmt, new_rhs1); + new_rhs2 = cast_a_tree(size_overflow_type, rhs2); + orig_rhs = rhs1; + gimple_assign_set_rhs = &gimple_assign_set_rhs1; + } else { + size_overflow_type = get_size_overflow_type_for_intentional_overflow(stmt, new_rhs2); + new_rhs1 = cast_a_tree(size_overflow_type, rhs1); + orig_rhs = rhs2; + gimple_assign_set_rhs = &gimple_assign_set_rhs2; + } + + change_rhs = cast_to_new_size_overflow_type(stmt, change_rhs, size_overflow_type, BEFORE_STMT); + + if (check_overflow) + check_size_overflow(stmt, size_overflow_type, change_rhs, orig_rhs, BEFORE_STMT); + + new_rhs = change_assign_rhs(stmt, orig_rhs, change_rhs); + gimple_assign_set_rhs(stmt, new_rhs); + update_stmt(stmt); + + return create_assign(visited, stmt, lhs, AFTER_STMT); +} + +static tree handle_binary_ops(struct pointer_set_t *visited, tree lhs) +{ + tree rhs1, rhs2, new_lhs; + gimple def_stmt = get_def_stmt(lhs); + tree new_rhs1 = NULL_TREE; + tree new_rhs2 = NULL_TREE; + + rhs1 = gimple_assign_rhs1(def_stmt); + rhs2 = gimple_assign_rhs2(def_stmt); + + /* no DImode/TImode division in the 32/64 bit kernel */ + switch (gimple_assign_rhs_code(def_stmt)) { + case RDIV_EXPR: + case TRUNC_DIV_EXPR: + case CEIL_DIV_EXPR: + case FLOOR_DIV_EXPR: + case ROUND_DIV_EXPR: + case TRUNC_MOD_EXPR: + case CEIL_MOD_EXPR: + case FLOOR_MOD_EXPR: + case ROUND_MOD_EXPR: + case EXACT_DIV_EXPR: + case POINTER_PLUS_EXPR: + case BIT_AND_EXPR: + return create_assign(visited, def_stmt, lhs, AFTER_STMT); + default: + break; + } + + new_lhs = handle_integer_truncation(visited, lhs); + if (new_lhs != NULL_TREE) + return new_lhs; + + if (TREE_CODE(rhs1) == SSA_NAME) + new_rhs1 = expand(visited, rhs1); + if (TREE_CODE(rhs2) == SSA_NAME) + new_rhs2 = expand(visited, rhs2); + + if (is_a_neg_overflow(def_stmt, rhs2)) + return handle_intentional_overflow(visited, true, def_stmt, new_rhs1, new_rhs1, NULL_TREE); + if (is_a_neg_overflow(def_stmt, rhs1)) + return handle_intentional_overflow(visited, true, def_stmt, new_rhs2, NULL_TREE, new_rhs2); + + if (is_a_constant_overflow(def_stmt, rhs2)) + return handle_intentional_overflow(visited, !is_a_cast_and_const_overflow(rhs1), def_stmt, new_rhs1, new_rhs1, NULL_TREE); + if (is_a_constant_overflow(def_stmt, rhs1)) + return handle_intentional_overflow(visited, !is_a_cast_and_const_overflow(rhs2), def_stmt, new_rhs2, NULL_TREE, new_rhs2); + + return follow_overflow_type_and_dup(visited, def_stmt, lhs, new_rhs1, new_rhs2, NULL_TREE); +} + +#if BUILDING_GCC_VERSION >= 4007 +static tree get_new_rhs(struct pointer_set_t *visited, tree size_overflow_type, tree rhs) +{ + if (is_gimple_constant(rhs)) + return cast_a_tree(size_overflow_type, rhs); + if (TREE_CODE(rhs) != SSA_NAME) + return NULL_TREE; + return expand(visited, rhs); +} + +static tree handle_ternary_ops(struct pointer_set_t *visited, tree lhs) +{ + tree rhs1, rhs2, rhs3, new_rhs1, new_rhs2, new_rhs3, size_overflow_type; + gimple def_stmt = get_def_stmt(lhs); + + size_overflow_type = get_size_overflow_type(def_stmt, lhs); + + rhs1 = gimple_assign_rhs1(def_stmt); + rhs2 = gimple_assign_rhs2(def_stmt); + rhs3 = gimple_assign_rhs3(def_stmt); + new_rhs1 = get_new_rhs(visited, size_overflow_type, rhs1); + new_rhs2 = get_new_rhs(visited, size_overflow_type, rhs2); + new_rhs3 = get_new_rhs(visited, size_overflow_type, rhs3); + + return follow_overflow_type_and_dup(visited, def_stmt, lhs, new_rhs1, new_rhs2, new_rhs3); +} +#endif + +static tree get_size_overflow_type(gimple stmt, const_tree node) +{ + const_tree type; + + gcc_assert(node != NULL_TREE); + + type = TREE_TYPE(node); + + if (gimple_plf(stmt, MY_STMT)) + return TREE_TYPE(node); + + switch (TYPE_MODE(type)) { + case QImode: + return (TYPE_UNSIGNED(type)) ? unsigned_intHI_type_node : intHI_type_node; + case HImode: + return (TYPE_UNSIGNED(type)) ? unsigned_intSI_type_node : intSI_type_node; + case SImode: + return (TYPE_UNSIGNED(type)) ? unsigned_intDI_type_node : intDI_type_node; + case DImode: + if (LONG_TYPE_SIZE == GET_MODE_BITSIZE(SImode)) + return (TYPE_UNSIGNED(type)) ? unsigned_intDI_type_node : intDI_type_node; + return (TYPE_UNSIGNED(type)) ? unsigned_intTI_type_node : intTI_type_node; + default: + debug_tree((tree)node); + error("%s: unsupported gcc configuration.", __func__); + gcc_unreachable(); + } +} + +static tree expand_visited(gimple def_stmt) +{ + const_gimple next_stmt; + gimple_stmt_iterator gsi = gsi_for_stmt(def_stmt); + + gsi_next(&gsi); + next_stmt = gsi_stmt(gsi); + + gcc_assert(gimple_plf((gimple)next_stmt, MY_STMT)); + + switch (gimple_code(next_stmt)) { + case GIMPLE_ASSIGN: + return gimple_get_lhs(next_stmt); + case GIMPLE_PHI: + return gimple_phi_result(next_stmt); + case GIMPLE_CALL: + return gimple_call_lhs(next_stmt); + default: + return NULL_TREE; + } +} + +static tree expand(struct pointer_set_t *visited, tree lhs) +{ + gimple def_stmt; + enum tree_code code = TREE_CODE(TREE_TYPE(lhs)); + + if (is_gimple_constant(lhs)) + return NULL_TREE; + + if (TREE_CODE(lhs) == ADDR_EXPR) + return NULL_TREE; + + if (code == REAL_TYPE) + return NULL_TREE; + + gcc_assert(code == INTEGER_TYPE || code == POINTER_TYPE || code == BOOLEAN_TYPE || code == ENUMERAL_TYPE); + + + def_stmt = get_def_stmt(lhs); + + if (!def_stmt) + return NULL_TREE; + + if (gimple_plf(def_stmt, MY_STMT)) + return lhs; + + if (pointer_set_contains(visited, def_stmt)) + return expand_visited(def_stmt); + + switch (gimple_code(def_stmt)) { + case GIMPLE_NOP: + return NULL_TREE; + case GIMPLE_PHI: + return build_new_phi(visited, lhs); + case GIMPLE_CALL: + case GIMPLE_ASM: + return create_assign(visited, def_stmt, lhs, AFTER_STMT); + case GIMPLE_ASSIGN: + switch (gimple_num_ops(def_stmt)) { + case 2: + return handle_unary_ops(visited, lhs); + case 3: + return handle_binary_ops(visited, lhs); +#if BUILDING_GCC_VERSION >= 4007 + case 4: + return handle_ternary_ops(visited, lhs); +#endif + } + default: + debug_gimple_stmt(def_stmt); + error("%s: unknown gimple code", __func__); + gcc_unreachable(); + } +} + +static void change_function_arg(gimple stmt, const_tree origarg, unsigned int argnum, tree newarg) +{ + const_gimple assign; + gimple_stmt_iterator gsi = gsi_for_stmt(stmt); + tree origtype = TREE_TYPE(origarg); + + gcc_assert(gimple_code(stmt) == GIMPLE_CALL); + + assign = build_cast_stmt(origtype, newarg, CREATE_NEW_VAR, &gsi, BEFORE_STMT); + + gimple_call_set_arg(stmt, argnum, gimple_get_lhs(assign)); + update_stmt(stmt); +} + +static bool get_function_arg(unsigned int* argnum, const_tree fndecl) +{ + const char *origid; + tree arg; + const_tree origarg; + + if (!DECL_ABSTRACT_ORIGIN(fndecl)) + return true; + + origarg = DECL_ARGUMENTS(DECL_ABSTRACT_ORIGIN(fndecl)); + while (origarg && *argnum) { + (*argnum)--; + origarg = TREE_CHAIN(origarg); + } + + gcc_assert(*argnum == 0); + + gcc_assert(origarg != NULL_TREE); + origid = NAME(origarg); + *argnum = 0; + for (arg = DECL_ARGUMENTS(fndecl); arg; arg = TREE_CHAIN(arg)) { + if (!strcmp(origid, NAME(arg))) + return true; + (*argnum)++; + } + return false; +} + +static bool skip_types(const_tree var) +{ + switch (TREE_CODE(var)) { + case ADDR_EXPR: +#if BUILDING_GCC_VERSION >= 4006 + case MEM_REF: +#endif + case ARRAY_REF: + case BIT_FIELD_REF: + case INDIRECT_REF: + case TARGET_MEM_REF: + case VAR_DECL: + return true; + default: + break; + } + return false; +} + +static bool walk_phi(struct pointer_set_t *visited, const_tree result) +{ + gimple phi = get_def_stmt(result); + unsigned int i, n = gimple_phi_num_args(phi); + + if (!phi) + return false; + + pointer_set_insert(visited, phi); + for (i = 0; i < n; i++) { + const_tree arg = gimple_phi_arg_def(phi, i); + if (pre_expand(visited, arg)) + return true; + } + return false; +} + +static bool walk_unary_ops(struct pointer_set_t *visited, const_tree lhs) +{ + gimple def_stmt = get_def_stmt(lhs); + const_tree rhs; + + if (!def_stmt) + return false; + + rhs = gimple_assign_rhs1(def_stmt); + if (pre_expand(visited, rhs)) + return true; + return false; +} + +static bool walk_binary_ops(struct pointer_set_t *visited, const_tree lhs) +{ + bool rhs1_found, rhs2_found; + gimple def_stmt = get_def_stmt(lhs); + const_tree rhs1, rhs2; + + if (!def_stmt) + return false; + + rhs1 = gimple_assign_rhs1(def_stmt); + rhs2 = gimple_assign_rhs2(def_stmt); + rhs1_found = pre_expand(visited, rhs1); + rhs2_found = pre_expand(visited, rhs2); + + return rhs1_found || rhs2_found; +} + +static const_tree search_field_decl(const_tree comp_ref) +{ + const_tree field = NULL_TREE; + unsigned int i, len = TREE_OPERAND_LENGTH(comp_ref); + + for (i = 0; i < len; i++) { + field = TREE_OPERAND(comp_ref, i); + if (TREE_CODE(field) == FIELD_DECL) + break; + } + gcc_assert(TREE_CODE(field) == FIELD_DECL); + return field; +} + +static enum marked mark_status(const_tree fndecl, unsigned int argnum) +{ + const_tree attr, p; + + attr = lookup_attribute("intentional_overflow", DECL_ATTRIBUTES(fndecl)); + if (!attr || !TREE_VALUE(attr)) + return MARKED_NO; + + p = TREE_VALUE(attr); + if (!TREE_INT_CST_LOW(TREE_VALUE(p))) + return MARKED_NOT_INTENTIONAL; + + do { + if (argnum == TREE_INT_CST_LOW(TREE_VALUE(p))) + return MARKED_YES; + p = TREE_CHAIN(p); + } while (p); + + return MARKED_NO; +} + +static void print_missing_msg(tree func, unsigned int argnum) +{ + unsigned int new_hash; + size_t len; + unsigned char tree_codes[CODES_LIMIT]; + location_t loc = DECL_SOURCE_LOCATION(func); + const char *curfunc = get_asm_name(func); + + len = get_function_decl(func, tree_codes); + new_hash = get_hash_num(curfunc, (const char *) tree_codes, len, 0); + inform(loc, "Function %s is missing from the size_overflow hash table +%s+%u+%u+", curfunc, curfunc, argnum, new_hash); +} + +static unsigned int search_missing_attribute(const_tree arg) +{ + const_tree type = TREE_TYPE(arg); + tree func = get_original_function_decl(current_function_decl); + unsigned int argnum; + const struct size_overflow_hash *hash; + + gcc_assert(TREE_CODE(arg) != COMPONENT_REF); + + if (TREE_CODE(type) == POINTER_TYPE) + return 0; + + argnum = find_arg_number(arg, func); + if (argnum == 0) + return 0; + + if (lookup_attribute("size_overflow", DECL_ATTRIBUTES(func))) + return argnum; + + hash = get_function_hash(func); + if (!hash || !(hash->param & (1U << argnum))) { + print_missing_msg(func, argnum); + return 0; + } + return argnum; +} + +static bool is_already_marked(const_tree lhs) +{ + unsigned int argnum; + const_tree fndecl; + + argnum = search_missing_attribute(lhs); + fndecl = get_original_function_decl(current_function_decl); + if (argnum && mark_status(fndecl, argnum) == MARKED_YES) + return true; + return false; +} + +static bool pre_expand(struct pointer_set_t *visited, const_tree lhs) +{ + const_gimple def_stmt; + + if (is_gimple_constant(lhs)) + return false; + + if (skip_types(lhs)) + return false; + + if (TREE_CODE(lhs) == PARM_DECL) + return is_already_marked(lhs); + + if (TREE_CODE(lhs) == COMPONENT_REF) { + const_tree field, attr; + + field = search_field_decl(lhs); + attr = lookup_attribute("intentional_overflow", DECL_ATTRIBUTES(field)); + if (!attr || !TREE_VALUE(attr)) + return false; + return true; + } + + def_stmt = get_def_stmt(lhs); + + if (!def_stmt) + return false; + + if (pointer_set_contains(visited, def_stmt)) + return false; + + switch (gimple_code(def_stmt)) { + case GIMPLE_NOP: + if (TREE_CODE(SSA_NAME_VAR(lhs)) == PARM_DECL) + return is_already_marked(lhs); + return false; + case GIMPLE_PHI: + return walk_phi(visited, lhs); + case GIMPLE_CALL: + case GIMPLE_ASM: + return false; + case GIMPLE_ASSIGN: + switch (gimple_num_ops(def_stmt)) { + case 2: + return walk_unary_ops(visited, lhs); + case 3: + return walk_binary_ops(visited, lhs); + } + default: + debug_gimple_stmt((gimple)def_stmt); + error("%s: unknown gimple code", __func__); + gcc_unreachable(); + } +} + +static bool search_attributes(tree fndecl, const_tree arg, unsigned int argnum) +{ + struct pointer_set_t *visited; + bool is_found; + enum marked is_marked; + location_t loc; + + visited = pointer_set_create(); + is_found = pre_expand(visited, arg); + pointer_set_destroy(visited); + + is_marked = mark_status(fndecl, argnum + 1); + if ((is_found && is_marked == MARKED_YES) || is_marked == MARKED_NOT_INTENTIONAL) + return true; + + if (is_found) { + loc = DECL_SOURCE_LOCATION(fndecl); + inform(loc, "The intentional_overflow attribute is missing from +%s+%u+", get_asm_name(fndecl), argnum + 1); + return true; + } + return false; +} + +static void handle_function_arg(gimple stmt, tree fndecl, unsigned int argnum) +{ + struct pointer_set_t *visited; + tree arg, newarg; + bool match; + + match = get_function_arg(&argnum, fndecl); + if (!match) + return; + gcc_assert(gimple_call_num_args(stmt) > argnum); + arg = gimple_call_arg(stmt, argnum); + if (arg == NULL_TREE) + return; + + if (is_gimple_constant(arg)) + return; + + if (search_attributes(fndecl, arg, argnum)) + return; + + if (TREE_CODE(arg) != SSA_NAME) + return; + + check_arg_type(arg); + + visited = pointer_set_create(); + newarg = expand(visited, arg); + pointer_set_destroy(visited); + + if (newarg == NULL_TREE) + return; + + change_function_arg(stmt, arg, argnum, newarg); + + check_size_overflow(stmt, TREE_TYPE(newarg), newarg, arg, BEFORE_STMT); +} + +static void handle_function_by_attribute(gimple stmt, const_tree attr, tree fndecl) +{ + tree p = TREE_VALUE(attr); + do { + handle_function_arg(stmt, fndecl, TREE_INT_CST_LOW(TREE_VALUE(p))-1); + p = TREE_CHAIN(p); + } while (p); +} + +static void handle_function_by_hash(gimple stmt, tree fndecl) +{ + tree orig_fndecl; + unsigned int num; + const struct size_overflow_hash *hash; + + orig_fndecl = get_original_function_decl(fndecl); + if (C_DECL_IMPLICIT(orig_fndecl)) + return; + hash = get_function_hash(orig_fndecl); + if (!hash) + return; + + for (num = 1; num <= MAX_PARAM; num++) + if (hash->param & (1U << num)) + handle_function_arg(stmt, fndecl, num - 1); +} + +static void set_plf_false(void) +{ + basic_block bb; + + FOR_ALL_BB(bb) { + gimple_stmt_iterator si; + + for (si = gsi_start_bb(bb); !gsi_end_p(si); gsi_next(&si)) + gimple_set_plf(gsi_stmt(si), MY_STMT, false); + for (si = gsi_start_phis(bb); !gsi_end_p(si); gsi_next(&si)) + gimple_set_plf(gsi_stmt(si), MY_STMT, false); + } +} + +static unsigned int handle_function(void) +{ + basic_block next, bb = ENTRY_BLOCK_PTR->next_bb; + + set_plf_false(); + + do { + gimple_stmt_iterator gsi; + next = bb->next_bb; + + for (gsi = gsi_start_bb(bb); !gsi_end_p(gsi); gsi_next(&gsi)) { + tree fndecl, attr; + gimple stmt = gsi_stmt(gsi); + + if (!(is_gimple_call(stmt))) + continue; + fndecl = gimple_call_fndecl(stmt); + if (fndecl == NULL_TREE) + continue; + if (gimple_call_num_args(stmt) == 0) + continue; + attr = lookup_attribute("size_overflow", DECL_ATTRIBUTES(fndecl)); + if (!attr || !TREE_VALUE(attr)) + handle_function_by_hash(stmt, fndecl); + else + handle_function_by_attribute(stmt, attr, fndecl); + gsi = gsi_for_stmt(stmt); + next = gimple_bb(stmt)->next_bb; + } + bb = next; + } while (bb); + return 0; +} + +static struct gimple_opt_pass size_overflow_pass = { + .pass = { + .type = GIMPLE_PASS, + .name = "size_overflow", + .gate = NULL, + .execute = handle_function, + .sub = NULL, + .next = NULL, + .static_pass_number = 0, + .tv_id = TV_NONE, + .properties_required = PROP_cfg | PROP_referenced_vars, + .properties_provided = 0, + .properties_destroyed = 0, + .todo_flags_start = 0, + .todo_flags_finish = TODO_verify_ssa | TODO_verify_stmts | TODO_dump_func | TODO_remove_unused_locals | TODO_update_ssa_no_phi | TODO_cleanup_cfg | TODO_ggc_collect | TODO_verify_flow + } +}; + +static void start_unit_callback(void __unused *gcc_data, void __unused *user_data) +{ + tree fntype; + + const_char_ptr_type_node = build_pointer_type(build_type_variant(char_type_node, 1, 0)); + + // void report_size_overflow(const char *loc_file, unsigned int loc_line, const char *current_func, const char *ssa_var) + fntype = build_function_type_list(void_type_node, + const_char_ptr_type_node, + unsigned_type_node, + const_char_ptr_type_node, + const_char_ptr_type_node, + NULL_TREE); + report_size_overflow_decl = build_fn_decl("report_size_overflow", fntype); + + DECL_ASSEMBLER_NAME(report_size_overflow_decl); + TREE_PUBLIC(report_size_overflow_decl) = 1; + DECL_EXTERNAL(report_size_overflow_decl) = 1; + DECL_ARTIFICIAL(report_size_overflow_decl) = 1; + TREE_THIS_VOLATILE(report_size_overflow_decl) = 1; +} + +int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version) +{ + int i; + const char * const plugin_name = plugin_info->base_name; + const int argc = plugin_info->argc; + const struct plugin_argument * const argv = plugin_info->argv; + bool enable = true; + + struct register_pass_info size_overflow_pass_info = { + .pass = &size_overflow_pass.pass, + .reference_pass_name = "ssa", + .ref_pass_instance_number = 1, + .pos_op = PASS_POS_INSERT_AFTER + }; + + if (!plugin_default_version_check(version, &gcc_version)) { + error(G_("incompatible gcc/plugin versions")); + return 1; + } + + for (i = 0; i < argc; ++i) { + if (!strcmp(argv[i].key, "no-size-overflow")) { + enable = false; + continue; + } + error(G_("unkown option '-fplugin-arg-%s-%s'"), plugin_name, argv[i].key); + } + + register_callback(plugin_name, PLUGIN_INFO, NULL, &size_overflow_plugin_info); + if (enable) { + register_callback("start_unit", PLUGIN_START_UNIT, &start_unit_callback, NULL); + register_callback(plugin_name, PLUGIN_PASS_MANAGER_SETUP, NULL, &size_overflow_pass_info); + } + register_callback(plugin_name, PLUGIN_ATTRIBUTES, register_attributes, NULL); + + return 0; +} --- tools/gcc/stackleak_plugin.c 1970-01-01 00:00:00.000000000 +0000 +++ tools/gcc/stackleak_plugin.c 2012-10-15 17:30:59.835924531 +0000 @@ -0,0 +1,313 @@ +/* + * Copyright 2011 by the PaX Team + * Licensed under the GPL v2 + * + * Note: the choice of the license means that the compilation process is + * NOT 'eligible' as defined by gcc's library exception to the GPL v3, + * but for the kernel it doesn't matter since it doesn't link against + * any of the gcc libraries + * + * gcc plugin to help implement various PaX features + * + * - track lowest stack pointer + * + * TODO: + * - initialize all local variables + * + * BUGS: + * - none known + */ +#include "gcc-plugin.h" +#include "config.h" +#include "system.h" +#include "coretypes.h" +#include "tree.h" +#include "tree-pass.h" +#include "flags.h" +#include "intl.h" +#include "toplev.h" +#include "plugin.h" +//#include "expr.h" where are you... +#include "diagnostic.h" +#include "plugin-version.h" +#include "tm.h" +#include "function.h" +#include "basic-block.h" +#include "gimple.h" +#include "rtl.h" +#include "emit-rtl.h" + +extern void print_gimple_stmt(FILE *, gimple, int, int); + +int plugin_is_GPL_compatible; + +static int track_frame_size = -1; +static const char track_function[] = "pax_track_stack"; +static const char check_function[] = "pax_check_alloca"; +static bool init_locals; + +static struct plugin_info stackleak_plugin_info = { + .version = "201203140940", + .help = "track-lowest-sp=nn\ttrack sp in functions whose frame size is at least nn bytes\n" +// "initialize-locals\t\tforcibly initialize all stack frames\n" +}; + +static bool gate_stackleak_track_stack(void); +static unsigned int execute_stackleak_tree_instrument(void); +static unsigned int execute_stackleak_final(void); + +static struct gimple_opt_pass stackleak_tree_instrument_pass = { + .pass = { + .type = GIMPLE_PASS, + .name = "stackleak_tree_instrument", + .gate = gate_stackleak_track_stack, + .execute = execute_stackleak_tree_instrument, + .sub = NULL, + .next = NULL, + .static_pass_number = 0, + .tv_id = TV_NONE, + .properties_required = PROP_gimple_leh | PROP_cfg, + .properties_provided = 0, + .properties_destroyed = 0, + .todo_flags_start = 0, //TODO_verify_ssa | TODO_verify_flow | TODO_verify_stmts, + .todo_flags_finish = TODO_verify_ssa | TODO_verify_stmts | TODO_dump_func | TODO_update_ssa + } +}; + +static struct rtl_opt_pass stackleak_final_rtl_opt_pass = { + .pass = { + .type = RTL_PASS, + .name = "stackleak_final", + .gate = gate_stackleak_track_stack, + .execute = execute_stackleak_final, + .sub = NULL, + .next = NULL, + .static_pass_number = 0, + .tv_id = TV_NONE, + .properties_required = 0, + .properties_provided = 0, + .properties_destroyed = 0, + .todo_flags_start = 0, + .todo_flags_finish = TODO_dump_func + } +}; + +static bool gate_stackleak_track_stack(void) +{ + return track_frame_size >= 0; +} + +static void stackleak_check_alloca(gimple_stmt_iterator *gsi) +{ + gimple check_alloca; + tree fntype, fndecl, alloca_size; + + fntype = build_function_type_list(void_type_node, long_unsigned_type_node, NULL_TREE); + fndecl = build_fn_decl(check_function, fntype); + DECL_ASSEMBLER_NAME(fndecl); // for LTO + + // insert call to void pax_check_alloca(unsigned long size) + alloca_size = gimple_call_arg(gsi_stmt(*gsi), 0); + check_alloca = gimple_build_call(fndecl, 1, alloca_size); + gsi_insert_before(gsi, check_alloca, GSI_SAME_STMT); +} + +static void stackleak_add_instrumentation(gimple_stmt_iterator *gsi) +{ + gimple track_stack; + tree fntype, fndecl; + + fntype = build_function_type_list(void_type_node, NULL_TREE); + fndecl = build_fn_decl(track_function, fntype); + DECL_ASSEMBLER_NAME(fndecl); // for LTO + + // insert call to void pax_track_stack(void) + track_stack = gimple_build_call(fndecl, 0); + gsi_insert_after(gsi, track_stack, GSI_CONTINUE_LINKING); +} + +#if BUILDING_GCC_VERSION == 4005 +static bool gimple_call_builtin_p(gimple stmt, enum built_in_function code) +{ + tree fndecl; + + if (!is_gimple_call(stmt)) + return false; + fndecl = gimple_call_fndecl(stmt); + if (!fndecl) + return false; + if (DECL_BUILT_IN_CLASS(fndecl) != BUILT_IN_NORMAL) + return false; +// print_node(stderr, "pax", fndecl, 4); + return DECL_FUNCTION_CODE(fndecl) == code; +} +#endif + +static bool is_alloca(gimple stmt) +{ + if (gimple_call_builtin_p(stmt, BUILT_IN_ALLOCA)) + return true; + +#if BUILDING_GCC_VERSION >= 4007 + if (gimple_call_builtin_p(stmt, BUILT_IN_ALLOCA_WITH_ALIGN)) + return true; +#endif + + return false; +} + +static unsigned int execute_stackleak_tree_instrument(void) +{ + basic_block bb, entry_bb; + bool prologue_instrumented = false, is_leaf = true; + + entry_bb = ENTRY_BLOCK_PTR_FOR_FUNCTION(cfun)->next_bb; + + // 1. loop through BBs and GIMPLE statements + FOR_EACH_BB(bb) { + gimple_stmt_iterator gsi; + + for (gsi = gsi_start_bb(bb); !gsi_end_p(gsi); gsi_next(&gsi)) { + gimple stmt; + + stmt = gsi_stmt(gsi); + + if (is_gimple_call(stmt)) + is_leaf = false; + + // gimple match: align 8 built-in BUILT_IN_NORMAL:BUILT_IN_ALLOCA attributes + if (!is_alloca(stmt)) + continue; + + // 2. insert stack overflow check before each __builtin_alloca call + stackleak_check_alloca(&gsi); + + // 3. insert track call after each __builtin_alloca call + stackleak_add_instrumentation(&gsi); + if (bb == entry_bb) + prologue_instrumented = true; + } + } + + // special cases for some bad linux code: taking the address of static inline functions will materialize them + // but we mustn't instrument some of them as the resulting stack alignment required by the function call ABI + // will break other assumptions regarding the expected (but not otherwise enforced) register clobbering ABI. + // case in point: native_save_fl on amd64 when optimized for size clobbers rdx if it were instrumented here. + if (is_leaf && !TREE_PUBLIC(current_function_decl) && DECL_DECLARED_INLINE_P(current_function_decl)) + return 0; + if (is_leaf && !strncmp(IDENTIFIER_POINTER(DECL_NAME(current_function_decl)), "_paravirt_", 10)) + return 0; + + // 4. insert track call at the beginning + if (!prologue_instrumented) { + gimple_stmt_iterator gsi; + + bb = split_block_after_labels(ENTRY_BLOCK_PTR)->dest; + if (dom_info_available_p(CDI_DOMINATORS)) + set_immediate_dominator(CDI_DOMINATORS, bb, ENTRY_BLOCK_PTR); + gsi = gsi_start_bb(bb); + stackleak_add_instrumentation(&gsi); + } + + return 0; +} + +static unsigned int execute_stackleak_final(void) +{ + rtx insn; + + if (cfun->calls_alloca) + return 0; + + // keep calls only if function frame is big enough + if (get_frame_size() >= track_frame_size) + return 0; + + // 1. find pax_track_stack calls + for (insn = get_insns(); insn; insn = NEXT_INSN(insn)) { + // rtl match: (call_insn 8 7 9 3 (call (mem (symbol_ref ("pax_track_stack") [flags 0x41] ) [0 S1 A8]) (4)) -1 (nil) (nil)) + rtx body; + + if (!CALL_P(insn)) + continue; + body = PATTERN(insn); + if (GET_CODE(body) != CALL) + continue; + body = XEXP(body, 0); + if (GET_CODE(body) != MEM) + continue; + body = XEXP(body, 0); + if (GET_CODE(body) != SYMBOL_REF) + continue; + if (strcmp(XSTR(body, 0), track_function)) + continue; +// warning(0, "track_frame_size: %d %ld %d", cfun->calls_alloca, get_frame_size(), track_frame_size); + // 2. delete call + insn = delete_insn_and_edges(insn); +#if BUILDING_GCC_VERSION >= 4007 + if (GET_CODE(insn) == NOTE && NOTE_KIND(insn) == NOTE_INSN_CALL_ARG_LOCATION) + insn = delete_insn_and_edges(insn); +#endif + } + +// print_simple_rtl(stderr, get_insns()); +// print_rtl(stderr, get_insns()); +// warning(0, "track_frame_size: %d %ld %d", cfun->calls_alloca, get_frame_size(), track_frame_size); + + return 0; +} + +int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version) +{ + const char * const plugin_name = plugin_info->base_name; + const int argc = plugin_info->argc; + const struct plugin_argument * const argv = plugin_info->argv; + int i; + struct register_pass_info stackleak_tree_instrument_pass_info = { + .pass = &stackleak_tree_instrument_pass.pass, +// .reference_pass_name = "tree_profile", + .reference_pass_name = "optimized", + .ref_pass_instance_number = 1, + .pos_op = PASS_POS_INSERT_BEFORE + }; + struct register_pass_info stackleak_final_pass_info = { + .pass = &stackleak_final_rtl_opt_pass.pass, + .reference_pass_name = "final", + .ref_pass_instance_number = 1, + .pos_op = PASS_POS_INSERT_BEFORE + }; + + if (!plugin_default_version_check(version, &gcc_version)) { + error(G_("incompatible gcc/plugin versions")); + return 1; + } + + register_callback(plugin_name, PLUGIN_INFO, NULL, &stackleak_plugin_info); + + for (i = 0; i < argc; ++i) { + if (!strcmp(argv[i].key, "track-lowest-sp")) { + if (!argv[i].value) { + error(G_("no value supplied for option '-fplugin-arg-%s-%s'"), plugin_name, argv[i].key); + continue; + } + track_frame_size = atoi(argv[i].value); + if (argv[i].value[0] < '0' || argv[i].value[0] > '9' || track_frame_size < 0) + error(G_("invalid option argument '-fplugin-arg-%s-%s=%s'"), plugin_name, argv[i].key, argv[i].value); + continue; + } + if (!strcmp(argv[i].key, "initialize-locals")) { + if (argv[i].value) { + error(G_("invalid option argument '-fplugin-arg-%s-%s=%s'"), plugin_name, argv[i].key, argv[i].value); + continue; + } + init_locals = true; + continue; + } + error(G_("unkown option '-fplugin-arg-%s-%s'"), plugin_name, argv[i].key); + } + + register_callback(plugin_name, PLUGIN_PASS_MANAGER_SETUP, NULL, &stackleak_tree_instrument_pass_info); + register_callback(plugin_name, PLUGIN_PASS_MANAGER_SETUP, NULL, &stackleak_final_pass_info); + + return 0; +}