diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index c7937f379d22..6a9c38fdd2e9 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -505,16 +505,6 @@ nosocket -- Disable socket memory accounting. nokmem -- Disable kernel memory accounting. - checkreqprot [SELINUX] Set initial checkreqprot flag value. - Format: { "0" | "1" } - See security/selinux/Kconfig help text. - 0 -- check protection applied by kernel (includes - any implied execute protection). - 1 -- check protection requested by application. - Default value is set via a kernel config option. - Value can be changed at runtime via - /selinux/checkreqprot. - cio_ignore= [S390] See Documentation/s390/CommonIO for details. clk_ignore_unused @@ -3241,6 +3231,11 @@ the specified number of seconds. This is to be used if your oopses keep scrolling off the screen. + extra_latent_entropy + Enable a very simple form of latent entropy extraction + from the first 4GB of memory as the bootmem allocator + passes the memory pages to the buddy allocator. + pcbit= [HW,ISDN] pcd. [PARIDE] diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt index aa058aa7bf28..228632fa5f66 100644 --- a/Documentation/sysctl/kernel.txt +++ b/Documentation/sysctl/kernel.txt @@ -97,6 +97,7 @@ show up in /proc/sys/kernel: - sysctl_writes_strict - tainted ==> Documentation/admin-guide/tainted-kernels.rst - threads-max +- tiocsti_restrict - unknown_nmi_panic - watchdog - watchdog_thresh @@ -1082,6 +1083,26 @@ available RAM pages threads-max is reduced accordingly. ============================================================== +tiocsti_restrict: + +This toggle indicates whether unprivileged users are prevented +from using the TIOCSTI ioctl to inject commands into other processes +which share a tty session. + +When tiocsti_restrict is set to (0) there are no restrictions(accept +the default restriction of only being able to injection commands into +one's own tty). When tiocsti_restrict is set to (1), users must +have CAP_SYS_ADMIN to use the TIOCSTI ioctl. + +When user namespaces are in use, the check for the capability +CAP_SYS_ADMIN is done against the user namespace that originally +opened the tty. + +The kernel config option CONFIG_SECURITY_TIOCSTI_RESTRICT sets the +default value of tiocsti_restrict. + +============================================================== + unknown_nmi_panic: The value in this file affects behavior of handling NMI. When the diff --git a/Makefile b/Makefile index d7b3c8e3ff3e..029b58e4e67f 100644 --- a/Makefile +++ b/Makefile @@ -717,6 +717,9 @@ stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong KBUILD_CFLAGS += $(stackp-flags-y) ifdef CONFIG_CC_IS_CLANG +ifdef CONFIG_LOCAL_INIT +KBUILD_CFLAGS += -fsanitize=local-init +endif KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) KBUILD_CFLAGS += $(call cc-disable-warning, gnu) diff --git a/arch/Kconfig b/arch/Kconfig index 9092e0ffe4d3..837a0297b720 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -631,7 +631,7 @@ config ARCH_MMAP_RND_BITS int "Number of bits to use for ASLR of mmap base address" if EXPERT range ARCH_MMAP_RND_BITS_MIN ARCH_MMAP_RND_BITS_MAX default ARCH_MMAP_RND_BITS_DEFAULT if ARCH_MMAP_RND_BITS_DEFAULT - default ARCH_MMAP_RND_BITS_MIN + default ARCH_MMAP_RND_BITS_MAX depends on HAVE_ARCH_MMAP_RND_BITS help This value can be used to select the number of bits to use to @@ -665,7 +665,7 @@ config ARCH_MMAP_RND_COMPAT_BITS int "Number of bits to use for ASLR of mmap base address for compatible applications" if EXPERT range ARCH_MMAP_RND_COMPAT_BITS_MIN ARCH_MMAP_RND_COMPAT_BITS_MAX default ARCH_MMAP_RND_COMPAT_BITS_DEFAULT if ARCH_MMAP_RND_COMPAT_BITS_DEFAULT - default ARCH_MMAP_RND_COMPAT_BITS_MIN + default ARCH_MMAP_RND_COMPAT_BITS_MAX depends on HAVE_ARCH_MMAP_RND_COMPAT_BITS help This value can be used to select the number of bits to use to @@ -873,6 +873,7 @@ config ARCH_HAS_REFCOUNT config REFCOUNT_FULL bool "Perform full reference count validation at the expense of speed" + default y help Enabling this switches the refcounting infrastructure from a fast unchecked atomic_t implementation to a fully state checked diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index d218729ec852..d0e94e76885f 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1166,6 +1166,7 @@ endif config ARM64_SW_TTBR0_PAN bool "Emulate Privileged Access Never using TTBR0_EL1 switching" + default y help Enabling this option prevents the kernel from accessing user-space memory directly by pointing TTBR0_EL1 to a reserved @@ -1393,6 +1394,7 @@ config RANDOMIZE_BASE bool "Randomize the address of the kernel image" select ARM64_MODULE_PLTS if MODULES select RELOCATABLE + default y help Randomizes the virtual address at which the kernel image is loaded, as a security feature that deters exploit attempts diff --git a/arch/arm64/Kconfig.debug b/arch/arm64/Kconfig.debug index 69c9170bdd24..a786227db0e3 100644 --- a/arch/arm64/Kconfig.debug +++ b/arch/arm64/Kconfig.debug @@ -42,6 +42,7 @@ config ARM64_RANDOMIZE_TEXT_OFFSET config DEBUG_WX bool "Warn on W+X mappings at boot" select ARM64_PTDUMP_CORE + default y ---help--- Generate a warning if any W+X mappings are found at boot. diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig index 32fb03503b0b..228d3770d924 100644 --- a/arch/arm64/configs/defconfig +++ b/arch/arm64/configs/defconfig @@ -1,4 +1,3 @@ -CONFIG_SYSVIPC=y CONFIG_POSIX_MQUEUE=y CONFIG_AUDIT=y CONFIG_NO_HZ_IDLE=y diff --git a/arch/arm64/include/asm/elf.h b/arch/arm64/include/asm/elf.h index 6adc1a90e7e6..1f4b06317c9f 100644 --- a/arch/arm64/include/asm/elf.h +++ b/arch/arm64/include/asm/elf.h @@ -114,14 +114,10 @@ /* * This is the base location for PIE (ET_DYN with INTERP) loads. On - * 64-bit, this is above 4GB to leave the entire 32-bit address + * 64-bit, this is raised to 4GB to leave the entire 32-bit address * space open for things that want to use the area for 32-bit pointers. */ -#ifdef CONFIG_ARM64_FORCE_52BIT -#define ELF_ET_DYN_BASE (2 * TASK_SIZE_64 / 3) -#else -#define ELF_ET_DYN_BASE (2 * DEFAULT_MAP_WINDOW_64 / 3) -#endif /* CONFIG_ARM64_FORCE_52BIT */ +#define ELF_ET_DYN_BASE 0x100000000UL #ifndef __ASSEMBLY__ @@ -175,10 +171,10 @@ extern int arch_setup_additional_pages(struct linux_binprm *bprm, /* 1GB of VA */ #ifdef CONFIG_COMPAT #define STACK_RND_MASK (test_thread_flag(TIF_32BIT) ? \ - 0x7ff >> (PAGE_SHIFT - 12) : \ - 0x3ffff >> (PAGE_SHIFT - 12)) + ((1UL << mmap_rnd_compat_bits) - 1) >> (PAGE_SHIFT - 12) : \ + ((1UL << mmap_rnd_bits) - 1) >> (PAGE_SHIFT - 12)) #else -#define STACK_RND_MASK (0x3ffff >> (PAGE_SHIFT - 12)) +#define STACK_RND_MASK (((1UL << mmap_rnd_bits) - 1) >> (PAGE_SHIFT - 12)) #endif #ifdef __AARCH64EB__ diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c index 3767fb21a5b8..776cf5d48f7d 100644 --- a/arch/arm64/kernel/process.c +++ b/arch/arm64/kernel/process.c @@ -538,9 +538,9 @@ unsigned long arch_align_stack(unsigned long sp) unsigned long arch_randomize_brk(struct mm_struct *mm) { if (is_compat_task()) - return randomize_page(mm->brk, SZ_32M); + return mm->brk + get_random_long() % SZ_32M + PAGE_SIZE; else - return randomize_page(mm->brk, SZ_1G); + return mm->brk + get_random_long() % SZ_1G + PAGE_SIZE; } /* diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 62fc3fda1a05..fe5f612d7014 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1202,8 +1202,7 @@ config VM86 default X86_LEGACY_VM86 config X86_16BIT - bool "Enable support for 16-bit segments" if EXPERT - default y + bool "Enable support for 16-bit segments" depends on MODIFY_LDT_SYSCALL ---help--- This option is required by programs like Wine to run 16-bit @@ -2291,7 +2290,7 @@ config COMPAT_VDSO choice prompt "vsyscall table for legacy applications" depends on X86_64 - default LEGACY_VSYSCALL_EMULATE + default LEGACY_VSYSCALL_NONE help Legacy user code that does not know how to find the vDSO expects to be able to issue three syscalls by calling fixed addresses in @@ -2372,8 +2371,7 @@ config CMDLINE_OVERRIDE be set to 'N' under normal conditions. config MODIFY_LDT_SYSCALL - bool "Enable the LDT (local descriptor table)" if EXPERT - default y + bool "Enable the LDT (local descriptor table)" ---help--- Linux can allow user programs to install a per-process x86 Local Descriptor Table (LDT) using the modify_ldt(2) system diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug index 15d0fbe27872..5c32c9818bd4 100644 --- a/arch/x86/Kconfig.debug +++ b/arch/x86/Kconfig.debug @@ -91,6 +91,7 @@ config EFI_PGT_DUMP config DEBUG_WX bool "Warn on W+X mappings at boot" select X86_PTDUMP_CORE + default y ---help--- Generate a warning if any W+X mappings are found at boot. diff --git a/arch/x86/configs/x86_64_defconfig b/arch/x86/configs/x86_64_defconfig index 1d3badfda09e..bd67e1778ffa 100644 --- a/arch/x86/configs/x86_64_defconfig +++ b/arch/x86/configs/x86_64_defconfig @@ -1,5 +1,4 @@ # CONFIG_LOCALVERSION_AUTO is not set -CONFIG_SYSVIPC=y CONFIG_POSIX_MQUEUE=y CONFIG_BSD_PROCESS_ACCT=y CONFIG_TASKSTATS=y diff --git a/arch/x86/entry/vdso/vma.c b/arch/x86/entry/vdso/vma.c index babc4e7a519c..197b79a50bf5 100644 --- a/arch/x86/entry/vdso/vma.c +++ b/arch/x86/entry/vdso/vma.c @@ -198,55 +198,9 @@ static int map_vdso(const struct vdso_image *image, unsigned long addr) } #ifdef CONFIG_X86_64 -/* - * Put the vdso above the (randomized) stack with another randomized - * offset. This way there is no hole in the middle of address space. - * To save memory make sure it is still in the same PTE as the stack - * top. This doesn't give that many random bits. - * - * Note that this algorithm is imperfect: the distribution of the vdso - * start address within a PMD is biased toward the end. - * - * Only used for the 64-bit and x32 vdsos. - */ -static unsigned long vdso_addr(unsigned long start, unsigned len) -{ - unsigned long addr, end; - unsigned offset; - - /* - * Round up the start address. It can start out unaligned as a result - * of stack start randomization. - */ - start = PAGE_ALIGN(start); - - /* Round the lowest possible end address up to a PMD boundary. */ - end = (start + len + PMD_SIZE - 1) & PMD_MASK; - if (end >= TASK_SIZE_MAX) - end = TASK_SIZE_MAX; - end -= len; - - if (end > start) { - offset = get_random_int() % (((end - start) >> PAGE_SHIFT) + 1); - addr = start + (offset << PAGE_SHIFT); - } else { - addr = start; - } - - /* - * Forcibly align the final address in case we have a hardware - * issue that requires alignment for performance reasons. - */ - addr = align_vdso_addr(addr); - - return addr; -} - static int map_vdso_randomized(const struct vdso_image *image) { - unsigned long addr = vdso_addr(current->mm->start_stack, image->size-image->sym_vvar_start); - - return map_vdso(image, addr); + return map_vdso(image, 0); } #endif diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h index 69c0f892e310..f9f7a85bb71e 100644 --- a/arch/x86/include/asm/elf.h +++ b/arch/x86/include/asm/elf.h @@ -248,11 +248,11 @@ extern int force_personality32; /* * This is the base location for PIE (ET_DYN with INTERP) loads. On - * 64-bit, this is above 4GB to leave the entire 32-bit address + * 64-bit, this is raised to 4GB to leave the entire 32-bit address * space open for things that want to use the area for 32-bit pointers. */ #define ELF_ET_DYN_BASE (mmap_is_ia32() ? 0x000400000UL : \ - (DEFAULT_MAP_WINDOW / 3 * 2)) + 0x100000000UL) /* This yields a mask that user programs can use to figure out what instruction set this CPU supports. This could be done in user space, @@ -312,8 +312,8 @@ extern bool mmap_address_hint_valid(unsigned long addr, unsigned long len); #ifdef CONFIG_X86_32 -#define __STACK_RND_MASK(is32bit) (0x7ff) -#define STACK_RND_MASK (0x7ff) +#define __STACK_RND_MASK(is32bit) ((1UL << mmap_rnd_bits) - 1) +#define STACK_RND_MASK ((1UL << mmap_rnd_bits) - 1) #define ARCH_DLINFO ARCH_DLINFO_IA32 @@ -322,7 +322,11 @@ extern bool mmap_address_hint_valid(unsigned long addr, unsigned long len); #else /* CONFIG_X86_32 */ /* 1GB for 64bit, 8MB for 32bit */ -#define __STACK_RND_MASK(is32bit) ((is32bit) ? 0x7ff : 0x3fffff) +#ifdef CONFIG_COMPAT +#define __STACK_RND_MASK(is32bit) ((is32bit) ? (1UL << mmap_rnd_compat_bits) - 1 : (1UL << mmap_rnd_bits) - 1) +#else +#define __STACK_RND_MASK(is32bit) ((1UL << mmap_rnd_bits) - 1) +#endif #define STACK_RND_MASK __STACK_RND_MASK(mmap_is_ia32()) #define ARCH_DLINFO \ @@ -380,5 +384,4 @@ struct va_alignment { } ____cacheline_aligned; extern struct va_alignment va_align; -extern unsigned long align_vdso_addr(unsigned long); #endif /* _ASM_X86_ELF_H */ diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h index f4204bf377fc..8ccc7aa0ece0 100644 --- a/arch/x86/include/asm/tlbflush.h +++ b/arch/x86/include/asm/tlbflush.h @@ -294,6 +294,7 @@ static inline void cr4_set_bits(unsigned long mask) local_irq_save(flags); cr4 = this_cpu_read(cpu_tlbstate.cr4); + BUG_ON(cr4 != __read_cr4()); if ((cr4 | mask) != cr4) __cr4_set(cr4 | mask); local_irq_restore(flags); @@ -306,6 +307,7 @@ static inline void cr4_clear_bits(unsigned long mask) local_irq_save(flags); cr4 = this_cpu_read(cpu_tlbstate.cr4); + BUG_ON(cr4 != __read_cr4()); if ((cr4 & ~mask) != cr4) __cr4_set(cr4 & ~mask); local_irq_restore(flags); @@ -316,6 +318,7 @@ static inline void cr4_toggle_bits_irqsoff(unsigned long mask) unsigned long cr4; cr4 = this_cpu_read(cpu_tlbstate.cr4); + BUG_ON(cr4 != __read_cr4()); __cr4_set(cr4 ^ mask); } @@ -422,6 +425,7 @@ static inline void __native_flush_tlb_global(void) raw_local_irq_save(flags); cr4 = this_cpu_read(cpu_tlbstate.cr4); + BUG_ON(cr4 != __read_cr4()); /* toggle PGE */ native_write_cr4(cr4 ^ X86_CR4_PGE); /* write old PGE again and flush TLBs */ diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index 132a63dc5a76..05c8de9b452e 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -1768,7 +1768,6 @@ void cpu_init(void) wrmsrl(MSR_KERNEL_GS_BASE, 0); barrier(); - x86_configure_nx(); x2apic_setup(); /* diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index 957eae13b370..01b7bb76bdbc 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -42,6 +42,8 @@ #include #include #include +#include +#include #include "process.h" @@ -798,7 +800,10 @@ unsigned long arch_align_stack(unsigned long sp) unsigned long arch_randomize_brk(struct mm_struct *mm) { - return randomize_page(mm->brk, 0x02000000); + if (mmap_is_ia32()) + return mm->brk + get_random_long() % SZ_32M + PAGE_SIZE; + else + return mm->brk + get_random_long() % SZ_1G + PAGE_SIZE; } /* diff --git a/arch/x86/kernel/sys_x86_64.c b/arch/x86/kernel/sys_x86_64.c index f7476ce23b6e..652169a2b23a 100644 --- a/arch/x86/kernel/sys_x86_64.c +++ b/arch/x86/kernel/sys_x86_64.c @@ -54,13 +54,6 @@ static unsigned long get_align_bits(void) return va_align.bits & get_align_mask(); } -unsigned long align_vdso_addr(unsigned long addr) -{ - unsigned long align_mask = get_align_mask(); - addr = (addr + align_mask) & ~align_mask; - return addr | get_align_bits(); -} - static int __init control_va_addr_alignment(char *str) { /* guard against enabling this on other CPU families */ @@ -122,10 +115,7 @@ static void find_start_end(unsigned long addr, unsigned long flags, } *begin = get_mmap_base(1); - if (in_32bit_syscall()) - *end = task_size_32bit(); - else - *end = task_size_64bit(addr > DEFAULT_MAP_WINDOW); + *end = get_mmap_base(0); } unsigned long @@ -210,7 +200,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, info.flags = VM_UNMAPPED_AREA_TOPDOWN; info.length = len; - info.low_limit = PAGE_SIZE; + info.low_limit = get_mmap_base(1); info.high_limit = get_mmap_base(0); /* diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c index 85c94f9a87f8..6b14ddb6c688 100644 --- a/arch/x86/mm/init_32.c +++ b/arch/x86/mm/init_32.c @@ -559,9 +559,9 @@ static void __init pagetable_init(void) #define DEFAULT_PTE_MASK ~(_PAGE_NX | _PAGE_GLOBAL) /* Bits supported by the hardware: */ -pteval_t __supported_pte_mask __read_mostly = DEFAULT_PTE_MASK; +pteval_t __supported_pte_mask __ro_after_init = DEFAULT_PTE_MASK; /* Bits allowed in normal kernel mappings: */ -pteval_t __default_kernel_pte_mask __read_mostly = DEFAULT_PTE_MASK; +pteval_t __default_kernel_pte_mask __ro_after_init = DEFAULT_PTE_MASK; EXPORT_SYMBOL_GPL(__supported_pte_mask); /* Used in PAGE_KERNEL_* macros which are reasonably used out-of-tree: */ EXPORT_SYMBOL(__default_kernel_pte_mask); diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index bccff68e3267..b4e3a62c2e50 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -65,9 +65,9 @@ */ /* Bits supported by the hardware: */ -pteval_t __supported_pte_mask __read_mostly = ~0; +pteval_t __supported_pte_mask __ro_after_init = ~0; /* Bits allowed in normal kernel mappings: */ -pteval_t __default_kernel_pte_mask __read_mostly = ~0; +pteval_t __default_kernel_pte_mask __ro_after_init = ~0; EXPORT_SYMBOL_GPL(__supported_pte_mask); /* Used in PAGE_KERNEL_* macros which are reasonably used out-of-tree: */ EXPORT_SYMBOL(__default_kernel_pte_mask); diff --git a/block/blk-softirq.c b/block/blk-softirq.c index 457d9ba3eb20..5f987fc1c0a0 100644 --- a/block/blk-softirq.c +++ b/block/blk-softirq.c @@ -20,7 +20,7 @@ static DEFINE_PER_CPU(struct list_head, blk_cpu_done); * Softirq action handler - move entries to local list and loop over them * while passing them to the queue registered handler. */ -static __latent_entropy void blk_done_softirq(struct softirq_action *h) +static __latent_entropy void blk_done_softirq(void) { struct list_head *cpu_list, local_list; diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 133fed8e4a8b..a04fccec45db 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -5161,7 +5161,7 @@ void ata_qc_free(struct ata_queued_cmd *qc) struct ata_port *ap; unsigned int tag; - WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */ + BUG_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */ ap = qc->ap; qc->flags = 0; @@ -5178,7 +5178,7 @@ void __ata_qc_complete(struct ata_queued_cmd *qc) struct ata_port *ap; struct ata_link *link; - WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */ + BUG_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */ WARN_ON_ONCE(!(qc->flags & ATA_QCFLAG_ACTIVE)); ap = qc->ap; link = qc->dev->link; diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig index 466ebd84ad17..a093e3f158c9 100644 --- a/drivers/char/Kconfig +++ b/drivers/char/Kconfig @@ -9,7 +9,6 @@ source "drivers/tty/Kconfig" config DEVMEM bool "/dev/mem virtual device support" - default y help Say Y here if you want to support the /dev/mem device. The /dev/mem device is used to access areas of physical @@ -536,7 +535,6 @@ config TELCLOCK config DEVPORT bool "/dev/port character device" depends on ISA || PCI - default y help Say Y here if you want to support the /dev/port device. The /dev/port device is similar to /dev/mem, but for I/O ports. diff --git a/drivers/tty/Kconfig b/drivers/tty/Kconfig index e0a04bfc873e..ec93f827c599 100644 --- a/drivers/tty/Kconfig +++ b/drivers/tty/Kconfig @@ -122,7 +122,6 @@ config UNIX98_PTYS config LEGACY_PTYS bool "Legacy (BSD) PTY support" - default y ---help--- A pseudo terminal (PTY) is a software device consisting of two halves: a master and a slave. The slave device behaves identical to diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index 5fa250157025..fabcb1ebd24b 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -173,6 +173,7 @@ static void free_tty_struct(struct tty_struct *tty) put_device(tty->dev); kfree(tty->write_buf); tty->magic = 0xDEADDEAD; + put_user_ns(tty->owner_user_ns); kfree(tty); } @@ -2178,11 +2179,19 @@ static int tty_fasync(int fd, struct file *filp, int on) * FIXME: may race normal receive processing */ +int tiocsti_restrict = IS_ENABLED(CONFIG_SECURITY_TIOCSTI_RESTRICT); + static int tiocsti(struct tty_struct *tty, char __user *p) { char ch, mbz = 0; struct tty_ldisc *ld; + if (tiocsti_restrict && + !ns_capable(tty->owner_user_ns, CAP_SYS_ADMIN)) { + dev_warn_ratelimited(tty->dev, + "Denied TIOCSTI ioctl for non-privileged process\n"); + return -EPERM; + } if ((current->signal->tty != tty) && !capable(CAP_SYS_ADMIN)) return -EPERM; if (get_user(ch, p)) @@ -3008,6 +3017,7 @@ struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx) tty->index = idx; tty_line_name(driver, idx, tty->name); tty->dev = tty_get_device(tty); + tty->owner_user_ns = get_user_ns(current_user_ns()); return tty; } diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c index e38f104db174..8570a8514e46 100644 --- a/drivers/tty/tty_ldisc.c +++ b/drivers/tty/tty_ldisc.c @@ -855,8 +855,8 @@ void tty_ldisc_deinit(struct tty_struct *tty) tty->ldisc = NULL; } -static int zero; -static int one = 1; +static int zero __read_only; +static int one __read_only = 1; static struct ctl_table tty_table[] = { { .procname = "ldisc_autoload", diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 310eef451db8..2c4c1f7045bf 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -42,6 +42,8 @@ #define USB_TP_TRANSMISSION_DELAY 40 /* ns */ #define USB_TP_TRANSMISSION_DELAY_MAX 65535 /* ns */ +extern int deny_new_usb; + /* Protect struct usb_device->state and ->children members * Note: Both are also protected by ->dev.sem, except that ->state can * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ @@ -4981,6 +4983,12 @@ static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus, goto done; return; } + + if (deny_new_usb) { + dev_err(&port_dev->dev, "denied insert of USB device on port %d\n", port1); + goto done; + } + if (hub_is_superspeed(hub->hdev)) unit_load = 150; else diff --git a/fs/exec.c b/fs/exec.c index 2e0033348d8e..003933540718 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -62,6 +62,7 @@ #include #include #include +#include #include #include @@ -275,6 +276,8 @@ static int __bprm_mm_init(struct linux_binprm *bprm) arch_bprm_mm_init(mm, vma); up_write(&mm->mmap_sem); bprm->p = vma->vm_end - sizeof(void *); + if (randomize_va_space) + bprm->p ^= get_random_int() & ~PAGE_MASK; return 0; err: up_write(&mm->mmap_sem); diff --git a/fs/namei.c b/fs/namei.c index dede0147b3f6..c708a5887276 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -883,10 +883,10 @@ static inline void put_link(struct nameidata *nd) path_put(&last->link); } -int sysctl_protected_symlinks __read_mostly = 0; -int sysctl_protected_hardlinks __read_mostly = 0; -int sysctl_protected_fifos __read_mostly; -int sysctl_protected_regular __read_mostly; +int sysctl_protected_symlinks __read_mostly = 1; +int sysctl_protected_hardlinks __read_mostly = 1; +int sysctl_protected_fifos __read_mostly = 2; +int sysctl_protected_regular __read_mostly = 2; /** * may_follow_link - Check symlink following for unsafe situations diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig index 5f93cfacb3d1..cea0d7d3b23e 100644 --- a/fs/nfs/Kconfig +++ b/fs/nfs/Kconfig @@ -195,4 +195,3 @@ config NFS_DEBUG bool depends on NFS_FS && SUNRPC_DEBUG select CRC32 - default y diff --git a/fs/proc/Kconfig b/fs/proc/Kconfig index 817c02b13b1d..b8cd62b5cbc3 100644 --- a/fs/proc/Kconfig +++ b/fs/proc/Kconfig @@ -40,7 +40,6 @@ config PROC_KCORE config PROC_VMCORE bool "/proc/vmcore support" depends on PROC_FS && CRASH_DUMP - default y help Exports the dump image of crashed kernel in ELF format. diff --git a/fs/stat.c b/fs/stat.c index c38e4c2e1221..6135fbaf7298 100644 --- a/fs/stat.c +++ b/fs/stat.c @@ -40,8 +40,13 @@ void generic_fillattr(struct inode *inode, struct kstat *stat) stat->gid = inode->i_gid; stat->rdev = inode->i_rdev; stat->size = i_size_read(inode); - stat->atime = inode->i_atime; - stat->mtime = inode->i_mtime; + if (is_sidechannel_device(inode) && !capable_noaudit(CAP_MKNOD)) { + stat->atime = inode->i_ctime; + stat->mtime = inode->i_ctime; + } else { + stat->atime = inode->i_atime; + stat->mtime = inode->i_mtime; + } stat->ctime = inode->i_ctime; stat->blksize = i_blocksize(inode); stat->blocks = inode->i_blocks; @@ -77,9 +82,14 @@ int vfs_getattr_nosec(const struct path *path, struct kstat *stat, if (IS_AUTOMOUNT(inode)) stat->attributes |= STATX_ATTR_AUTOMOUNT; - if (inode->i_op->getattr) - return inode->i_op->getattr(path, stat, request_mask, - query_flags); + if (inode->i_op->getattr) { + int retval = inode->i_op->getattr(path, stat, request_mask, query_flags); + if (!retval && is_sidechannel_device(inode) && !capable_noaudit(CAP_MKNOD)) { + stat->atime = stat->ctime; + stat->mtime = stat->ctime; + } + return retval; + } generic_fillattr(inode, stat); return 0; diff --git a/include/linux/cache.h b/include/linux/cache.h index 750621e41d1c..e7157c18c62c 100644 --- a/include/linux/cache.h +++ b/include/linux/cache.h @@ -31,6 +31,8 @@ #define __ro_after_init __attribute__((__section__(".data..ro_after_init"))) #endif +#define __read_only __ro_after_init + #ifndef ____cacheline_aligned #define ____cacheline_aligned __attribute__((__aligned__(SMP_CACHE_BYTES))) #endif diff --git a/include/linux/capability.h b/include/linux/capability.h index ecce0f43c73a..e46306dd4401 100644 --- a/include/linux/capability.h +++ b/include/linux/capability.h @@ -208,6 +208,7 @@ extern bool has_capability_noaudit(struct task_struct *t, int cap); extern bool has_ns_capability_noaudit(struct task_struct *t, struct user_namespace *ns, int cap); extern bool capable(int cap); +extern bool capable_noaudit(int cap); extern bool ns_capable(struct user_namespace *ns, int cap); extern bool ns_capable_noaudit(struct user_namespace *ns, int cap); extern bool ns_capable_setid(struct user_namespace *ns, int cap); @@ -234,6 +235,10 @@ static inline bool capable(int cap) { return true; } +static inline bool capable_noaudit(int cap) +{ + return true; +} static inline bool ns_capable(struct user_namespace *ns, int cap) { return true; diff --git a/include/linux/fs.h b/include/linux/fs.h index dd28e7679089..cc0030c688d1 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -3534,4 +3534,15 @@ static inline struct sock *io_uring_get_socket(struct file *file) } #endif +extern int device_sidechannel_restrict; + +static inline bool is_sidechannel_device(const struct inode *inode) +{ + umode_t mode; + if (!device_sidechannel_restrict) + return false; + mode = inode->i_mode; + return ((S_ISCHR(mode) || S_ISBLK(mode)) && (mode & (S_IROTH | S_IWOTH))); +} + #endif /* _LINUX_FS_H */ diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h index e30d6132c633..d62017d489fa 100644 --- a/include/linux/fsnotify.h +++ b/include/linux/fsnotify.h @@ -207,6 +207,9 @@ static inline void fsnotify_access(struct file *file) struct inode *inode = file_inode(file); __u32 mask = FS_ACCESS; + if (is_sidechannel_device(inode)) + return; + if (S_ISDIR(inode->i_mode)) mask |= FS_ISDIR; @@ -223,6 +226,9 @@ static inline void fsnotify_modify(struct file *file) struct inode *inode = file_inode(file); __u32 mask = FS_MODIFY; + if (is_sidechannel_device(inode)) + return; + if (S_ISDIR(inode->i_mode)) mask |= FS_ISDIR; diff --git a/include/linux/gfp.h b/include/linux/gfp.h index fdab7de7490d..13755aff72ab 100644 --- a/include/linux/gfp.h +++ b/include/linux/gfp.h @@ -530,9 +530,9 @@ extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order, extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); extern unsigned long get_zeroed_page(gfp_t gfp_mask); -void *alloc_pages_exact(size_t size, gfp_t gfp_mask); +void *alloc_pages_exact(size_t size, gfp_t gfp_mask) __attribute__((alloc_size(1))); void free_pages_exact(void *virt, size_t size); -void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask); +void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask) __attribute__((alloc_size(2))); #define __get_free_page(gfp_mask) \ __get_free_pages((gfp_mask), 0) diff --git a/include/linux/highmem.h b/include/linux/highmem.h index ea5cdbd8c2c3..805b84d6bbca 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -215,6 +215,13 @@ static inline void clear_highpage(struct page *page) kunmap_atomic(kaddr); } +static inline void verify_zero_highpage(struct page *page) +{ + void *kaddr = kmap_atomic(page); + BUG_ON(memchr_inv(kaddr, 0, PAGE_SIZE)); + kunmap_atomic(kaddr); +} + static inline void zero_user_segments(struct page *page, unsigned start1, unsigned end1, unsigned start2, unsigned end2) diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h index 690b238a44d5..06e831f45016 100644 --- a/include/linux/interrupt.h +++ b/include/linux/interrupt.h @@ -535,7 +535,7 @@ extern const char * const softirq_to_name[NR_SOFTIRQS]; struct softirq_action { - void (*action)(struct softirq_action *); + void (*action)(void); }; asmlinkage void do_softirq(void); @@ -550,7 +550,7 @@ static inline void do_softirq_own_stack(void) } #endif -extern void open_softirq(int nr, void (*action)(struct softirq_action *)); +extern void __init open_softirq(int nr, void (*action)(void)); extern void softirq_init(void); extern void __raise_softirq_irqoff(unsigned int nr); diff --git a/include/linux/kobject_ns.h b/include/linux/kobject_ns.h index 069aa2ebef90..cb9e3637a620 100644 --- a/include/linux/kobject_ns.h +++ b/include/linux/kobject_ns.h @@ -45,7 +45,7 @@ struct kobj_ns_type_operations { void (*drop_ns)(void *); }; -int kobj_ns_type_register(const struct kobj_ns_type_operations *ops); +int __init kobj_ns_type_register(const struct kobj_ns_type_operations *ops); int kobj_ns_type_registered(enum kobj_ns_type type); const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent); const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj); diff --git a/include/linux/mm.h b/include/linux/mm.h index 6b10c21630f5..e992a6c03666 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -599,7 +599,7 @@ static inline int is_vmalloc_or_module_addr(const void *x) } #endif -extern void *kvmalloc_node(size_t size, gfp_t flags, int node); +extern void *kvmalloc_node(size_t size, gfp_t flags, int node) __attribute__((alloc_size(1))); static inline void *kvmalloc(size_t size, gfp_t flags) { return kvmalloc_node(size, flags, NUMA_NO_NODE); diff --git a/include/linux/percpu.h b/include/linux/percpu.h index 70b7123f38c7..09f3019489b2 100644 --- a/include/linux/percpu.h +++ b/include/linux/percpu.h @@ -129,7 +129,7 @@ extern int __init pcpu_page_first_chunk(size_t reserved_size, pcpu_fc_populate_pte_fn_t populate_pte_fn); #endif -extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align); +extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align) __attribute__((alloc_size(1))); extern bool __is_kernel_percpu_address(unsigned long addr, unsigned long *can_addr); extern bool is_kernel_percpu_address(unsigned long addr); @@ -137,8 +137,8 @@ extern bool is_kernel_percpu_address(unsigned long addr); extern void __init setup_per_cpu_areas(void); #endif -extern void __percpu *__alloc_percpu_gfp(size_t size, size_t align, gfp_t gfp); -extern void __percpu *__alloc_percpu(size_t size, size_t align); +extern void __percpu *__alloc_percpu_gfp(size_t size, size_t align, gfp_t gfp) __attribute__((alloc_size(1))); +extern void __percpu *__alloc_percpu(size_t size, size_t align) __attribute__((alloc_size(1))); extern void free_percpu(void __percpu *__pdata); extern phys_addr_t per_cpu_ptr_to_phys(void *addr); diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 1f678f023850..54a9effb6831 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -1205,6 +1205,11 @@ extern int perf_cpu_time_max_percent_handler(struct ctl_table *table, int write, int perf_event_max_stack_handler(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos); +static inline bool perf_paranoid_any(void) +{ + return sysctl_perf_event_paranoid > 2; +} + static inline bool perf_paranoid_tracepoint_raw(void) { return sysctl_perf_event_paranoid > -1; diff --git a/include/linux/slab.h b/include/linux/slab.h index 9449b19c5f10..f7beb5b69b60 100644 --- a/include/linux/slab.h +++ b/include/linux/slab.h @@ -180,8 +180,8 @@ void memcg_destroy_kmem_caches(struct mem_cgroup *); /* * Common kmalloc functions provided by all allocators */ -void * __must_check __krealloc(const void *, size_t, gfp_t); -void * __must_check krealloc(const void *, size_t, gfp_t); +void * __must_check __krealloc(const void *, size_t, gfp_t) __attribute__((alloc_size(2))); +void * __must_check krealloc(const void *, size_t, gfp_t) __attribute((alloc_size(2))); void kfree(const void *); void kzfree(const void *); size_t ksize(const void *); @@ -385,7 +385,7 @@ static __always_inline unsigned int kmalloc_index(size_t size) } #endif /* !CONFIG_SLOB */ -void *__kmalloc(size_t size, gfp_t flags) __assume_kmalloc_alignment __malloc; +void *__kmalloc(size_t size, gfp_t flags) __assume_kmalloc_alignment __malloc __attribute__((alloc_size(1))); void *kmem_cache_alloc(struct kmem_cache *, gfp_t flags) __assume_slab_alignment __malloc; void kmem_cache_free(struct kmem_cache *, void *); @@ -409,7 +409,7 @@ static __always_inline void kfree_bulk(size_t size, void **p) } #ifdef CONFIG_NUMA -void *__kmalloc_node(size_t size, gfp_t flags, int node) __assume_kmalloc_alignment __malloc; +void *__kmalloc_node(size_t size, gfp_t flags, int node) __assume_kmalloc_alignment __malloc __attribute__((alloc_size(1))); void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node) __assume_slab_alignment __malloc; #else static __always_inline void *__kmalloc_node(size_t size, gfp_t flags, int node) @@ -530,7 +530,7 @@ static __always_inline void *kmalloc_large(size_t size, gfp_t flags) * Try really hard to succeed the allocation but fail * eventually. */ -static __always_inline void *kmalloc(size_t size, gfp_t flags) +static __always_inline __attribute__((alloc_size(1))) void *kmalloc(size_t size, gfp_t flags) { if (__builtin_constant_p(size)) { #ifndef CONFIG_SLOB @@ -572,7 +572,7 @@ static __always_inline unsigned int kmalloc_size(unsigned int n) return 0; } -static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node) +static __always_inline __attribute__((alloc_size(1))) void *kmalloc_node(size_t size, gfp_t flags, int node) { #ifndef CONFIG_SLOB if (__builtin_constant_p(size) && diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h index d2153789bd9f..97da977d6060 100644 --- a/include/linux/slub_def.h +++ b/include/linux/slub_def.h @@ -121,6 +121,11 @@ struct kmem_cache { unsigned long random; #endif +#ifdef CONFIG_SLAB_CANARY + unsigned long random_active; + unsigned long random_inactive; +#endif + #ifdef CONFIG_NUMA /* * Defragmentation by allocating from a remote node. diff --git a/include/linux/string.h b/include/linux/string.h index 6ab0a6fa512e..d3c5b10a4102 100644 --- a/include/linux/string.h +++ b/include/linux/string.h @@ -245,10 +245,16 @@ void __read_overflow2(void) __compiletime_error("detected read beyond size of ob void __read_overflow3(void) __compiletime_error("detected read beyond size of object passed as 3rd parameter"); void __write_overflow(void) __compiletime_error("detected write beyond size of object passed as 1st parameter"); +#ifdef CONFIG_FORTIFY_SOURCE_STRICT_STRING +#define __string_size(p) __builtin_object_size(p, 1) +#else +#define __string_size(p) __builtin_object_size(p, 0) +#endif + #if !defined(__NO_FORTIFY) && defined(__OPTIMIZE__) && defined(CONFIG_FORTIFY_SOURCE) __FORTIFY_INLINE char *strncpy(char *p, const char *q, __kernel_size_t size) { - size_t p_size = __builtin_object_size(p, 0); + size_t p_size = __string_size(p); if (__builtin_constant_p(size) && p_size < size) __write_overflow(); if (p_size < size) @@ -258,7 +264,7 @@ __FORTIFY_INLINE char *strncpy(char *p, const char *q, __kernel_size_t size) __FORTIFY_INLINE char *strcat(char *p, const char *q) { - size_t p_size = __builtin_object_size(p, 0); + size_t p_size = __string_size(p); if (p_size == (size_t)-1) return __builtin_strcat(p, q); if (strlcat(p, q, p_size) >= p_size) @@ -269,7 +275,7 @@ __FORTIFY_INLINE char *strcat(char *p, const char *q) __FORTIFY_INLINE __kernel_size_t strlen(const char *p) { __kernel_size_t ret; - size_t p_size = __builtin_object_size(p, 0); + size_t p_size = __string_size(p); /* Work around gcc excess stack consumption issue */ if (p_size == (size_t)-1 || @@ -284,7 +290,7 @@ __FORTIFY_INLINE __kernel_size_t strlen(const char *p) extern __kernel_size_t __real_strnlen(const char *, __kernel_size_t) __RENAME(strnlen); __FORTIFY_INLINE __kernel_size_t strnlen(const char *p, __kernel_size_t maxlen) { - size_t p_size = __builtin_object_size(p, 0); + size_t p_size = __string_size(p); __kernel_size_t ret = __real_strnlen(p, maxlen < p_size ? maxlen : p_size); if (p_size <= ret && maxlen != ret) fortify_panic(__func__); @@ -296,8 +302,8 @@ extern size_t __real_strlcpy(char *, const char *, size_t) __RENAME(strlcpy); __FORTIFY_INLINE size_t strlcpy(char *p, const char *q, size_t size) { size_t ret; - size_t p_size = __builtin_object_size(p, 0); - size_t q_size = __builtin_object_size(q, 0); + size_t p_size = __string_size(p); + size_t q_size = __string_size(q); if (p_size == (size_t)-1 && q_size == (size_t)-1) return __real_strlcpy(p, q, size); ret = strlen(q); @@ -317,8 +323,8 @@ __FORTIFY_INLINE size_t strlcpy(char *p, const char *q, size_t size) __FORTIFY_INLINE char *strncat(char *p, const char *q, __kernel_size_t count) { size_t p_len, copy_len; - size_t p_size = __builtin_object_size(p, 0); - size_t q_size = __builtin_object_size(q, 0); + size_t p_size = __string_size(p); + size_t q_size = __string_size(q); if (p_size == (size_t)-1 && q_size == (size_t)-1) return __builtin_strncat(p, q, count); p_len = strlen(p); @@ -431,8 +437,8 @@ __FORTIFY_INLINE void *kmemdup(const void *p, size_t size, gfp_t gfp) /* defined after fortified strlen and memcpy to reuse them */ __FORTIFY_INLINE char *strcpy(char *p, const char *q) { - size_t p_size = __builtin_object_size(p, 0); - size_t q_size = __builtin_object_size(q, 0); + size_t p_size = __string_size(p); + size_t q_size = __string_size(q); if (p_size == (size_t)-1 && q_size == (size_t)-1) return __builtin_strcpy(p, q); memcpy(p, q, strlen(q) + 1); diff --git a/include/linux/tty.h b/include/linux/tty.h index bfa4e2ee94a9..3e18d583fc8d 100644 --- a/include/linux/tty.h +++ b/include/linux/tty.h @@ -14,6 +14,7 @@ #include #include #include +#include /* @@ -336,6 +337,7 @@ struct tty_struct { /* If the tty has a pending do_SAK, queue it here - akpm */ struct work_struct SAK_work; struct tty_port *port; + struct user_namespace *owner_user_ns; } __randomize_layout; /* Each of a tty's open files has private_data pointing to tty_file_private */ @@ -345,6 +347,8 @@ struct tty_file_private { struct list_head list; }; +extern int tiocsti_restrict; + /* tty magic number */ #define TTY_MAGIC 0x5401 diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h index 398e9c95cd61..baab7195306a 100644 --- a/include/linux/vmalloc.h +++ b/include/linux/vmalloc.h @@ -69,19 +69,19 @@ static inline void vmalloc_init(void) } #endif -extern void *vmalloc(unsigned long size); -extern void *vzalloc(unsigned long size); -extern void *vmalloc_user(unsigned long size); -extern void *vmalloc_node(unsigned long size, int node); -extern void *vzalloc_node(unsigned long size, int node); -extern void *vmalloc_exec(unsigned long size); -extern void *vmalloc_32(unsigned long size); -extern void *vmalloc_32_user(unsigned long size); -extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot); +extern void *vmalloc(unsigned long size) __attribute__((alloc_size(1))); +extern void *vzalloc(unsigned long size) __attribute__((alloc_size(1))); +extern void *vmalloc_user(unsigned long size) __attribute__((alloc_size(1))); +extern void *vmalloc_node(unsigned long size, int node) __attribute__((alloc_size(1))); +extern void *vzalloc_node(unsigned long size, int node) __attribute__((alloc_size(1))); +extern void *vmalloc_exec(unsigned long size) __attribute__((alloc_size(1))); +extern void *vmalloc_32(unsigned long size) __attribute__((alloc_size(1))); +extern void *vmalloc_32_user(unsigned long size) __attribute__((alloc_size(1))); +extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot) __attribute__((alloc_size(1))); extern void *__vmalloc_node_range(unsigned long size, unsigned long align, unsigned long start, unsigned long end, gfp_t gfp_mask, pgprot_t prot, unsigned long vm_flags, int node, - const void *caller); + const void *caller) __attribute__((alloc_size(1))); #ifndef CONFIG_MMU extern void *__vmalloc_node_flags(unsigned long size, int node, gfp_t flags); static inline void *__vmalloc_node_flags_caller(unsigned long size, int node, diff --git a/init/Kconfig b/init/Kconfig index 4592bf7997c0..2a5dfc8ed04f 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -342,6 +342,7 @@ config USELIB config AUDIT bool "Auditing support" depends on NET + default y help Enable auditing infrastructure that can be used with another kernel subsystem, such as SELinux (which requires this for @@ -1139,6 +1140,12 @@ config CC_OPTIMIZE_FOR_SIZE endchoice +config LOCAL_INIT + bool "Zero uninitialized locals" + help + Zero-fill uninitialized local variables, other than variable-length + arrays. Requires compiler support. + config HAVE_LD_DEAD_CODE_DATA_ELIMINATION bool help @@ -1425,8 +1432,7 @@ config SHMEM which may be appropriate on small systems without swap. config AIO - bool "Enable AIO support" if EXPERT - default y + bool "Enable AIO support" help This option enables POSIX asynchronous I/O which may by used by some high performance threaded applications. Disabling @@ -1652,7 +1658,7 @@ config VM_EVENT_COUNTERS config SLUB_DEBUG default y - bool "Enable SLUB debugging support" if EXPERT + bool "Enable SLUB debugging support" depends on SLUB && SYSFS help SLUB has extensive debug support features. Disabling these can @@ -1676,7 +1682,6 @@ config SLUB_MEMCG_SYSFS_ON config COMPAT_BRK bool "Disable heap randomization" - default y help Randomizing heap placement makes heap exploits harder, but it also breaks ancient binaries (including anything libc5 based). @@ -1723,7 +1728,6 @@ endchoice config SLAB_MERGE_DEFAULT bool "Allow slab caches to be merged" - default y help For reduced kernel memory fragmentation, slab caches can be merged when they share the same size and other characteristics. @@ -1736,9 +1740,9 @@ config SLAB_MERGE_DEFAULT command line. config SLAB_FREELIST_RANDOM - default n depends on SLAB || SLUB bool "SLAB freelist randomization" + default y help Randomizes the freelist order used on creating new pages. This security feature reduces the predictability of the kernel slab @@ -1747,12 +1751,56 @@ config SLAB_FREELIST_RANDOM config SLAB_FREELIST_HARDENED bool "Harden slab freelist metadata" depends on SLUB + default y help Many kernel heap attacks try to target slab cache metadata and other infrastructure. This options makes minor performance sacrifies to harden the kernel slab allocator against common freelist exploit methods. +config SLAB_HARDENED + default y + depends on SLUB + bool "Hardened SLAB infrastructure" + help + Make minor performance sacrifices to harden the kernel slab + allocator. + +config SLAB_CANARY + depends on SLUB + depends on !SLAB_MERGE_DEFAULT + bool "SLAB canaries" + default y + help + Place canaries at the end of kernel slab allocations, sacrificing + some performance and memory usage for security. + + Canaries can detect some forms of heap corruption when allocations + are freed and as part of the HARDENED_USERCOPY feature. It provides + basic use-after-free detection for HARDENED_USERCOPY. + + Canaries absorb small overflows (rendering them harmless), mitigate + non-NUL terminated C string overflows on 64-bit via a guaranteed zero + byte and provide basic double-free detection. + +config SLAB_SANITIZE + bool "Sanitize SLAB allocations" + depends on SLUB + default y + help + Zero fill slab allocations on free, reducing the lifetime of + sensitive data and helping to mitigate use-after-free bugs. + + For slabs with debug poisoning enabling, this has no impact. + +config SLAB_SANITIZE_VERIFY + depends on SLAB_SANITIZE && PAGE_SANITIZE + default y + bool "Verify sanitized SLAB allocations" + help + Verify that newly allocated slab allocations are zeroed to detect + write-after-free bugs. + config SLUB_CPU_PARTIAL default y depends on SLUB && SMP diff --git a/kernel/audit.c b/kernel/audit.c index c89ea48c70a6..eeac2e76739d 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -1641,6 +1641,9 @@ static int __init audit_enable(char *str) if (audit_default == AUDIT_OFF) audit_initialized = AUDIT_DISABLED; + else if (!audit_ever_enabled) + audit_initialized = AUDIT_UNINITIALIZED; + if (audit_set_enabled(audit_default)) pr_err("audit: error setting audit state (%d)\n", audit_default); diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c index 06ba9c5f156b..135eaaeff0b5 100644 --- a/kernel/bpf/core.c +++ b/kernel/bpf/core.c @@ -521,7 +521,7 @@ void bpf_prog_kallsyms_del_all(struct bpf_prog *fp) #ifdef CONFIG_BPF_JIT /* All BPF JIT sysctl knobs here. */ int bpf_jit_enable __read_mostly = IS_BUILTIN(CONFIG_BPF_JIT_ALWAYS_ON); -int bpf_jit_harden __read_mostly; +int bpf_jit_harden __read_mostly = 2; int bpf_jit_kallsyms __read_mostly; long bpf_jit_limit __read_mostly; diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index db6e825e2958..9b8d4b5368b1 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -47,7 +47,7 @@ static DEFINE_SPINLOCK(prog_idr_lock); static DEFINE_IDR(map_idr); static DEFINE_SPINLOCK(map_idr_lock); -int sysctl_unprivileged_bpf_disabled __read_mostly; +int sysctl_unprivileged_bpf_disabled __read_mostly = 1; static const struct bpf_map_ops * const bpf_map_types[] = { #define BPF_PROG_TYPE(_id, _ops) diff --git a/kernel/capability.c b/kernel/capability.c index 1444f3954d75..8cc9dd7992f2 100644 --- a/kernel/capability.c +++ b/kernel/capability.c @@ -449,6 +449,12 @@ bool capable(int cap) return ns_capable(&init_user_ns, cap); } EXPORT_SYMBOL(capable); + +bool capable_noaudit(int cap) +{ + return ns_capable_noaudit(&init_user_ns, cap); +} +EXPORT_SYMBOL(capable_noaudit); #endif /* CONFIG_MULTIUSER */ /** diff --git a/kernel/events/core.c b/kernel/events/core.c index dc7dead2d2cc..e078b1fec819 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -398,8 +398,13 @@ static cpumask_var_t perf_online_mask; * 0 - disallow raw tracepoint access for unpriv * 1 - disallow cpu events for unpriv * 2 - disallow kernel profiling for unpriv + * 3 - disallow all unpriv perf event use */ +#ifdef CONFIG_SECURITY_PERF_EVENTS_RESTRICT +int sysctl_perf_event_paranoid __read_mostly = 3; +#else int sysctl_perf_event_paranoid __read_mostly = 2; +#endif /* Minimum for 512 kiB + 1 user control page */ int sysctl_perf_event_mlock __read_mostly = 512 + (PAGE_SIZE / 1024); /* 'free' kiB per user */ @@ -10748,6 +10753,9 @@ SYSCALL_DEFINE5(perf_event_open, if (flags & ~PERF_FLAG_ALL) return -EINVAL; + if (perf_paranoid_any() && !capable(CAP_SYS_ADMIN)) + return -EACCES; + err = perf_copy_attr(attr_uptr, &attr); if (err) return err; diff --git a/kernel/fork.c b/kernel/fork.c index 2628f3773ca8..a2da35b446a6 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -103,6 +103,11 @@ #define CREATE_TRACE_POINTS #include +#ifdef CONFIG_USER_NS +extern int unprivileged_userns_clone; +#else +#define unprivileged_userns_clone 0 +#endif /* * Minimum number of threads to boot the kernel @@ -1719,6 +1724,10 @@ static __latent_entropy struct task_struct *copy_process( if ((clone_flags & (CLONE_NEWUSER|CLONE_FS)) == (CLONE_NEWUSER|CLONE_FS)) return ERR_PTR(-EINVAL); + if ((clone_flags & CLONE_NEWUSER) && !unprivileged_userns_clone) + if (!capable(CAP_SYS_ADMIN)) + return ERR_PTR(-EPERM); + /* * Thread groups must share signals as well, and detached threads * can only be started up within the thread group. @@ -2554,6 +2563,12 @@ int ksys_unshare(unsigned long unshare_flags) if (unshare_flags & CLONE_NEWNS) unshare_flags |= CLONE_FS; + if ((unshare_flags & CLONE_NEWUSER) && !unprivileged_userns_clone) { + err = -EPERM; + if (!capable(CAP_SYS_ADMIN)) + goto bad_unshare_out; + } + err = check_unshare_flags(unshare_flags); if (err) goto bad_unshare_out; diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c index f08a1e4ee1d4..ece99ca24ed0 100644 --- a/kernel/power/snapshot.c +++ b/kernel/power/snapshot.c @@ -1142,7 +1142,7 @@ void free_basic_memory_bitmaps(void) void clear_free_pages(void) { -#ifdef CONFIG_PAGE_POISONING_ZERO +#if defined(CONFIG_PAGE_POISONING_ZERO) || defined(CONFIG_PAGE_SANITIZE) struct memory_bitmap *bm = free_pages_map; unsigned long pfn; @@ -1159,7 +1159,7 @@ void clear_free_pages(void) } memory_bm_position_reset(bm); pr_info("free pages cleared after restore\n"); -#endif /* PAGE_POISONING_ZERO */ +#endif /* PAGE_POISONING_ZERO || PAGE_SANITIZE */ } /** diff --git a/kernel/rcu/tiny.c b/kernel/rcu/tiny.c index 911bd9076d43..b65e2ee716c4 100644 --- a/kernel/rcu/tiny.c +++ b/kernel/rcu/tiny.c @@ -74,7 +74,7 @@ void rcu_sched_clock_irq(int user) } /* Invoke the RCU callbacks whose grace period has elapsed. */ -static __latent_entropy void rcu_process_callbacks(struct softirq_action *unused) +static __latent_entropy void rcu_process_callbacks(void) { struct rcu_head *next, *list; unsigned long flags; diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index acd6ccf56faf..17db4829d2c0 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -2731,7 +2731,7 @@ void rcu_fwd_progress_check(unsigned long j) EXPORT_SYMBOL_GPL(rcu_fwd_progress_check); /* Perform RCU core processing work for the current CPU. */ -static __latent_entropy void rcu_core(struct softirq_action *unused) +static __latent_entropy void rcu_core(void) { unsigned long flags; struct rcu_data *rdp = raw_cpu_ptr(&rcu_data); diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 232491e3ed0d..194d10702841 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -10117,7 +10117,7 @@ static int idle_balance(struct rq *this_rq, struct rq_flags *rf) * run_rebalance_domains is triggered when needed from the scheduler tick. * Also triggered for nohz idle balancing (with nohz_balancing_kick set). */ -static __latent_entropy void run_rebalance_domains(struct softirq_action *h) +static __latent_entropy void run_rebalance_domains(void) { struct rq *this_rq = this_rq(); enum cpu_idle_type idle = this_rq->idle_balance ? diff --git a/kernel/softirq.c b/kernel/softirq.c index 10277429ed84..d1323bdfc20c 100644 --- a/kernel/softirq.c +++ b/kernel/softirq.c @@ -53,7 +53,7 @@ DEFINE_PER_CPU_ALIGNED(irq_cpustat_t, irq_stat); EXPORT_PER_CPU_SYMBOL(irq_stat); #endif -static struct softirq_action softirq_vec[NR_SOFTIRQS] __cacheline_aligned_in_smp; +static struct softirq_action softirq_vec[NR_SOFTIRQS] __ro_after_init __aligned(PAGE_SIZE); DEFINE_PER_CPU(struct task_struct *, ksoftirqd); @@ -290,7 +290,7 @@ asmlinkage __visible void __softirq_entry __do_softirq(void) kstat_incr_softirqs_this_cpu(vec_nr); trace_softirq_entry(vec_nr); - h->action(h); + h->action(); trace_softirq_exit(vec_nr); if (unlikely(prev_count != preempt_count())) { pr_err("huh, entered softirq %u %s %p with preempt_count %08x, exited with %08x?\n", @@ -453,7 +453,7 @@ void __raise_softirq_irqoff(unsigned int nr) or_softirq_pending(1UL << nr); } -void open_softirq(int nr, void (*action)(struct softirq_action *)) +void __init open_softirq(int nr, void (*action)(void)) { softirq_vec[nr].action = action; } @@ -499,8 +499,7 @@ void __tasklet_hi_schedule(struct tasklet_struct *t) } EXPORT_SYMBOL(__tasklet_hi_schedule); -static void tasklet_action_common(struct softirq_action *a, - struct tasklet_head *tl_head, +static void tasklet_action_common(struct tasklet_head *tl_head, unsigned int softirq_nr) { struct tasklet_struct *list; @@ -537,14 +536,14 @@ static void tasklet_action_common(struct softirq_action *a, } } -static __latent_entropy void tasklet_action(struct softirq_action *a) +static __latent_entropy void tasklet_action(void) { - tasklet_action_common(a, this_cpu_ptr(&tasklet_vec), TASKLET_SOFTIRQ); + tasklet_action_common(this_cpu_ptr(&tasklet_vec), TASKLET_SOFTIRQ); } -static __latent_entropy void tasklet_hi_action(struct softirq_action *a) +static __latent_entropy void tasklet_hi_action(void) { - tasklet_action_common(a, this_cpu_ptr(&tasklet_hi_vec), HI_SOFTIRQ); + tasklet_action_common(this_cpu_ptr(&tasklet_hi_vec), HI_SOFTIRQ); } void tasklet_init(struct tasklet_struct *t, diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 387efbaf464a..238a6d0c25dc 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -66,6 +66,7 @@ #include #include #include +#include #include "../lib/kstrtox.h" @@ -102,12 +103,19 @@ #if defined(CONFIG_SYSCTL) /* External variables not in a header file. */ +#if IS_ENABLED(CONFIG_USB) +int deny_new_usb __read_mostly = 0; +EXPORT_SYMBOL(deny_new_usb); +#endif extern int suid_dumpable; #ifdef CONFIG_COREDUMP extern int core_uses_pid; extern char core_pattern[]; extern unsigned int core_pipe_limit; #endif +#ifdef CONFIG_USER_NS +extern int unprivileged_userns_clone; +#endif extern int pid_max; extern int pid_max_min, pid_max_max; extern int percpu_pagelist_fraction; @@ -119,35 +127,35 @@ extern int sysctl_nr_trim_pages; /* Constants used for minimum and maximum */ #ifdef CONFIG_LOCKUP_DETECTOR -static int sixty = 60; +static int sixty __read_only = 60; #endif -static int __maybe_unused neg_one = -1; +static int __maybe_unused neg_one __read_only = -1; -static int zero; -static int __maybe_unused one = 1; -static int __maybe_unused two = 2; -static int __maybe_unused four = 4; -static unsigned long zero_ul; -static unsigned long one_ul = 1; -static unsigned long long_max = LONG_MAX; -static int one_hundred = 100; -static int one_thousand = 1000; +static int zero __read_only; +static int __maybe_unused one __read_only = 1; +static int __maybe_unused two __read_only = 2; +static int __maybe_unused four __read_only = 4; +static unsigned long zero_ul __read_only; +static unsigned long one_ul __read_only = 1; +static unsigned long long_max __read_only = LONG_MAX; +static int one_hundred __read_only = 100; +static int one_thousand __read_only = 1000; #ifdef CONFIG_PRINTK -static int ten_thousand = 10000; +static int ten_thousand __read_only = 10000; #endif #ifdef CONFIG_PERF_EVENTS -static int six_hundred_forty_kb = 640 * 1024; +static int six_hundred_forty_kb __read_only = 640 * 1024; #endif /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ -static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; +static unsigned long dirty_bytes_min __read_only = 2 * PAGE_SIZE; /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ -static int maxolduid = 65535; -static int minolduid; +static int maxolduid __read_only = 65535; +static int minolduid __read_only; -static int ngroups_max = NGROUPS_MAX; +static int ngroups_max __read_only = NGROUPS_MAX; static const int cap_last_cap = CAP_LAST_CAP; /* @@ -155,9 +163,12 @@ static const int cap_last_cap = CAP_LAST_CAP; * and hung_task_check_interval_secs */ #ifdef CONFIG_DETECT_HUNG_TASK -static unsigned long hung_task_timeout_max = (LONG_MAX/HZ); +static unsigned long hung_task_timeout_max __read_only = (LONG_MAX/HZ); #endif +int device_sidechannel_restrict __read_mostly = 1; +EXPORT_SYMBOL(device_sidechannel_restrict); + #ifdef CONFIG_INOTIFY_USER #include #endif @@ -306,19 +317,19 @@ static struct ctl_table sysctl_base_table[] = { }; #ifdef CONFIG_SCHED_DEBUG -static int min_sched_granularity_ns = 100000; /* 100 usecs */ -static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ -static int min_wakeup_granularity_ns; /* 0 usecs */ -static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ +static int min_sched_granularity_ns __read_only = 100000; /* 100 usecs */ +static int max_sched_granularity_ns __read_only = NSEC_PER_SEC; /* 1 second */ +static int min_wakeup_granularity_ns __read_only; /* 0 usecs */ +static int max_wakeup_granularity_ns __read_only = NSEC_PER_SEC; /* 1 second */ #ifdef CONFIG_SMP -static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; -static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; +static int min_sched_tunable_scaling __read_only = SCHED_TUNABLESCALING_NONE; +static int max_sched_tunable_scaling __read_only = SCHED_TUNABLESCALING_END-1; #endif /* CONFIG_SMP */ #endif /* CONFIG_SCHED_DEBUG */ #ifdef CONFIG_COMPACTION -static int min_extfrag_threshold; -static int max_extfrag_threshold = 1000; +static int min_extfrag_threshold __read_only; +static int max_extfrag_threshold __read_only = 1000; #endif static struct ctl_table kern_table[] = { @@ -535,6 +546,15 @@ static struct ctl_table kern_table[] = { .proc_handler = proc_dointvec, }, #endif +#ifdef CONFIG_USER_NS + { + .procname = "unprivileged_userns_clone", + .data = &unprivileged_userns_clone, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, +#endif #ifdef CONFIG_PROC_SYSCTL { .procname = "tainted", @@ -890,6 +910,37 @@ static struct ctl_table kern_table[] = { .extra1 = &zero, .extra2 = &two, }, +#endif +#if defined CONFIG_TTY + { + .procname = "tiocsti_restrict", + .data = &tiocsti_restrict, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax_sysadmin, + .extra1 = &zero, + .extra2 = &one, + }, +#endif + { + .procname = "device_sidechannel_restrict", + .data = &device_sidechannel_restrict, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax_sysadmin, + .extra1 = &zero, + .extra2 = &one, + }, +#if IS_ENABLED(CONFIG_USB) + { + .procname = "deny_new_usb", + .data = &deny_new_usb, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax_sysadmin, + .extra1 = &zero, + .extra2 = &one, + }, #endif { .procname = "ngroups_max", diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c index 41dfff23c1f9..298a1554c3e4 100644 --- a/kernel/time/hrtimer.c +++ b/kernel/time/hrtimer.c @@ -1453,7 +1453,7 @@ static void __hrtimer_run_queues(struct hrtimer_cpu_base *cpu_base, ktime_t now, } } -static __latent_entropy void hrtimer_run_softirq(struct softirq_action *h) +static __latent_entropy void hrtimer_run_softirq(void) { struct hrtimer_cpu_base *cpu_base = this_cpu_ptr(&hrtimer_bases); unsigned long flags; diff --git a/kernel/time/timer.c b/kernel/time/timer.c index 2fce056f8a49..acac240068c1 100644 --- a/kernel/time/timer.c +++ b/kernel/time/timer.c @@ -1687,7 +1687,7 @@ static inline void __run_timers(struct timer_base *base) /* * This function runs timers and the timer-tq in bottom half context. */ -static __latent_entropy void run_timer_softirq(struct softirq_action *h) +static __latent_entropy void run_timer_softirq(void) { struct timer_base *base = this_cpu_ptr(&timer_bases[BASE_STD]); diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c index 923414a246e9..6b9dbc257e34 100644 --- a/kernel/user_namespace.c +++ b/kernel/user_namespace.c @@ -26,6 +26,9 @@ #include #include +/* sysctl */ +int unprivileged_userns_clone; + static struct kmem_cache *user_ns_cachep __read_mostly; static DEFINE_MUTEX(userns_state_mutex); diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index d5a4a4036d2f..b16d39c4c407 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -350,6 +350,9 @@ config SECTION_MISMATCH_WARN_ONLY If unsure, say Y. +config DEBUG_WRITABLE_FUNCTION_POINTERS_VERBOSE + bool "Enable verbose reporting of writable function pointers" + # # Select this config option from the architecture Kconfig, if it # is preferred to always offer frame pointers as a config @@ -966,6 +969,7 @@ endmenu # "Debug lockups and hangs" config PANIC_ON_OOPS bool "Panic on Oops" + default y help Say Y here to enable the kernel to panic when it oopses. This has the same effect as setting oops=panic on the kernel command @@ -975,7 +979,7 @@ config PANIC_ON_OOPS anything erroneous after an oops which could result in data corruption or other issues. - Say N if unsure. + Say Y if unsure. config PANIC_ON_OOPS_VALUE int @@ -1344,6 +1348,7 @@ config DEBUG_BUGVERBOSE config DEBUG_LIST bool "Debug linked list manipulation" depends on DEBUG_KERNEL || BUG_ON_DATA_CORRUPTION + default y help Enable this to turn on extended checks in the linked-list walking routines. @@ -2026,6 +2031,7 @@ config MEMTEST config BUG_ON_DATA_CORRUPTION bool "Trigger a BUG when data corruption is detected" select DEBUG_LIST + default y help Select this option if the kernel should BUG when it encounters data corruption in kernel memory structures when they get checked @@ -2065,6 +2071,7 @@ config STRICT_DEVMEM config IO_STRICT_DEVMEM bool "Filter I/O access to /dev/mem" depends on STRICT_DEVMEM + default y ---help--- If this option is disabled, you allow userspace (root) access to all io-memory regardless of whether a driver is actively using that diff --git a/lib/irq_poll.c b/lib/irq_poll.c index 2f17b488d58e..b6e7996a0058 100644 --- a/lib/irq_poll.c +++ b/lib/irq_poll.c @@ -75,7 +75,7 @@ void irq_poll_complete(struct irq_poll *iop) } EXPORT_SYMBOL(irq_poll_complete); -static void __latent_entropy irq_poll_softirq(struct softirq_action *h) +static void __latent_entropy irq_poll_softirq(void) { struct list_head *list = this_cpu_ptr(&blk_cpu_iopoll); int rearm = 0, budget = irq_poll_budget; diff --git a/lib/kobject.c b/lib/kobject.c index aa89edcd2b63..c505d13ba323 100644 --- a/lib/kobject.c +++ b/lib/kobject.c @@ -978,9 +978,9 @@ EXPORT_SYMBOL_GPL(kset_create_and_add); static DEFINE_SPINLOCK(kobj_ns_type_lock); -static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES]; +static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES] __ro_after_init; -int kobj_ns_type_register(const struct kobj_ns_type_operations *ops) +int __init kobj_ns_type_register(const struct kobj_ns_type_operations *ops) { enum kobj_ns_type type = ops->type; int error; diff --git a/lib/nlattr.c b/lib/nlattr.c index d26de6156b97..ed11787fcfe7 100644 --- a/lib/nlattr.c +++ b/lib/nlattr.c @@ -539,6 +539,8 @@ int nla_memcpy(void *dest, const struct nlattr *src, int count) { int minlen = min_t(int, count, nla_len(src)); + BUG_ON(minlen < 0); + memcpy(dest, nla_data(src), minlen); if (count > minlen) memset(dest + minlen, 0, count - minlen); diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 791b6fa36905..6d6a3ad3bf0f 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -1476,7 +1476,7 @@ char *uuid_string(char *buf, char *end, const u8 *addr, return string(buf, end, uuid, spec); } -int kptr_restrict __read_mostly; +int kptr_restrict __read_mostly = 2; static noinline_for_stack char *restricted_pointer(char *buf, char *end, const void *ptr, diff --git a/mm/Kconfig b/mm/Kconfig index 2e6d24d783f7..c378add17049 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -306,7 +306,8 @@ config KSM config DEFAULT_MMAP_MIN_ADDR int "Low address space to protect from user allocation" depends on MMU - default 4096 + default 32768 if ARM || (ARM64 && COMPAT) + default 65536 help This is the portion of low virtual memory which should be protected from userspace allocation. Keeping a user from writing to low pages diff --git a/mm/mmap.c b/mm/mmap.c index 2d6a6662edb9..e154e7fc1d8a 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -233,6 +233,13 @@ SYSCALL_DEFINE1(brk, unsigned long, brk) newbrk = PAGE_ALIGN(brk); oldbrk = PAGE_ALIGN(mm->brk); + /* properly handle unaligned min_brk as an empty heap */ + if (min_brk & ~PAGE_MASK) { + if (brk == min_brk) + newbrk -= PAGE_SIZE; + if (mm->brk == min_brk) + oldbrk -= PAGE_SIZE; + } if (oldbrk == newbrk) { mm->brk = brk; goto success; diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 475ca5b1a824..87371ac3ad1e 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -67,6 +67,7 @@ #include #include #include +#include #include #include @@ -104,6 +105,15 @@ struct pcpu_drain { DEFINE_MUTEX(pcpu_drain_mutex); DEFINE_PER_CPU(struct pcpu_drain, pcpu_drain); +bool __meminitdata extra_latent_entropy; + +static int __init setup_extra_latent_entropy(char *str) +{ + extra_latent_entropy = true; + return 0; +} +early_param("extra_latent_entropy", setup_extra_latent_entropy); + #ifdef CONFIG_GCC_PLUGIN_LATENT_ENTROPY volatile unsigned long latent_entropy __latent_entropy; EXPORT_SYMBOL(latent_entropy); @@ -1142,6 +1152,13 @@ static __always_inline bool free_pages_prepare(struct page *page, debug_check_no_obj_freed(page_address(page), PAGE_SIZE << order); } + + if (IS_ENABLED(CONFIG_PAGE_SANITIZE)) { + int i; + for (i = 0; i < (1 << order); i++) + clear_highpage(page + i); + } + arch_free_page(page, order); kernel_poison_pages(page, 1 << order, 0); kernel_map_pages(page, 1 << order, 0); @@ -1373,6 +1390,25 @@ static void __free_pages_ok(struct page *page, unsigned int order) local_irq_restore(flags); } +static void __init __gather_extra_latent_entropy(struct page *page, + unsigned int nr_pages) +{ + if (extra_latent_entropy && !PageHighMem(page) && page_to_pfn(page) < 0x100000) { + unsigned long hash = 0; + size_t index, end = PAGE_SIZE * nr_pages / sizeof hash; + const unsigned long *data = lowmem_page_address(page); + + for (index = 0; index < end; index++) + hash ^= hash + data[index]; +#ifdef CONFIG_GCC_PLUGIN_LATENT_ENTROPY + latent_entropy ^= hash; + add_device_randomness((const void *)&latent_entropy, sizeof(latent_entropy)); +#else + add_device_randomness((const void *)&hash, sizeof(hash)); +#endif + } +} + void __free_pages_core(struct page *page, unsigned int order) { unsigned int nr_pages = 1 << order; @@ -1387,7 +1423,6 @@ void __free_pages_core(struct page *page, unsigned int order) } __ClearPageReserved(p); set_page_count(p, 0); - atomic_long_add(nr_pages, &page_zone(page)->managed_pages); set_page_refcounted(page); __free_pages(page, order); @@ -1452,6 +1487,7 @@ void __init memblock_free_pages(struct page *page, unsigned long pfn, { if (early_page_uninitialised(pfn)) return; + __gather_extra_latent_entropy(page, 1 << order); __free_pages_core(page, order); } @@ -1542,6 +1578,7 @@ static void __init deferred_free_range(unsigned long pfn, if (nr_pages == pageblock_nr_pages && (pfn & (pageblock_nr_pages - 1)) == 0) { set_pageblock_migratetype(page, MIGRATE_MOVABLE); + __gather_extra_latent_entropy(page, 1 << pageblock_order); __free_pages_core(page, pageblock_order); return; } @@ -1549,6 +1586,7 @@ static void __init deferred_free_range(unsigned long pfn, for (i = 0; i < nr_pages; i++, page++, pfn++) { if ((pfn & (pageblock_nr_pages - 1)) == 0) set_pageblock_migratetype(page, MIGRATE_MOVABLE); + __gather_extra_latent_entropy(page, 1); __free_pages_core(page, 0); } } @@ -1969,8 +2007,8 @@ static inline int check_new_page(struct page *page) static inline bool free_pages_prezeroed(void) { - return IS_ENABLED(CONFIG_PAGE_POISONING_ZERO) && - page_poisoning_enabled(); + return IS_ENABLED(CONFIG_PAGE_SANITIZE) || + (IS_ENABLED(CONFIG_PAGE_POISONING_ZERO) && page_poisoning_enabled()); } #ifdef CONFIG_DEBUG_VM @@ -2027,6 +2065,11 @@ static void prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags post_alloc_hook(page, order, gfp_flags); + if (IS_ENABLED(CONFIG_PAGE_SANITIZE_VERIFY)) { + for (i = 0; i < (1 << order); i++) + verify_zero_highpage(page + i); + } + if (!free_pages_prezeroed() && (gfp_flags & __GFP_ZERO)) for (i = 0; i < (1 << order); i++) clear_highpage(page + i); diff --git a/mm/slab.h b/mm/slab.h index 43ac818b8592..0f4fc66322c4 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -310,7 +310,11 @@ static inline bool is_root_cache(struct kmem_cache *s) static inline bool slab_equal_or_root(struct kmem_cache *s, struct kmem_cache *p) { +#ifdef CONFIG_SLAB_HARDENED + return p == s; +#else return true; +#endif } static inline const char *cache_name(struct kmem_cache *s) @@ -362,18 +366,26 @@ static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x) * to not do even the assignment. In that case, slab_equal_or_root * will also be a constant. */ - if (!memcg_kmem_enabled() && + if (!IS_ENABLED(CONFIG_SLAB_HARDENED) && + !memcg_kmem_enabled() && !unlikely(s->flags & SLAB_CONSISTENCY_CHECKS)) return s; page = virt_to_head_page(x); +#ifdef CONFIG_SLAB_HARDENED + BUG_ON(!PageSlab(page)); +#endif cachep = page->slab_cache; if (slab_equal_or_root(cachep, s)) return cachep; pr_err("%s: Wrong slab cache. %s but object is from %s\n", __func__, s->name, cachep->name); +#ifdef CONFIG_BUG_ON_DATA_CORRUPTION + BUG_ON(1); +#else WARN_ON_ONCE(1); +#endif return s; } @@ -398,7 +410,7 @@ static inline size_t slab_ksize(const struct kmem_cache *s) * back there or track user information then we can * only use the space before that information. */ - if (s->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_STORE_USER)) + if ((s->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_STORE_USER)) || IS_ENABLED(CONFIG_SLAB_CANARY)) return s->inuse; /* * Else we can use all the padding etc for the allocation diff --git a/mm/slab_common.c b/mm/slab_common.c index 58251ba63e4a..fbaacef2acaf 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -27,10 +27,10 @@ #include "slab.h" -enum slab_state slab_state; +enum slab_state slab_state __ro_after_init; LIST_HEAD(slab_caches); DEFINE_MUTEX(slab_mutex); -struct kmem_cache *kmem_cache; +struct kmem_cache *kmem_cache __ro_after_init; #ifdef CONFIG_HARDENED_USERCOPY bool usercopy_fallback __ro_after_init = @@ -58,7 +58,7 @@ static DECLARE_WORK(slab_caches_to_rcu_destroy_work, /* * Merge control. If this is set then no merging of slab caches will occur. */ -static bool slab_nomerge = !IS_ENABLED(CONFIG_SLAB_MERGE_DEFAULT); +static bool slab_nomerge __ro_after_init = !IS_ENABLED(CONFIG_SLAB_MERGE_DEFAULT); static int __init setup_slab_nomerge(char *str) { diff --git a/mm/slub.c b/mm/slub.c index d30ede89f4a6..37db8891a099 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -124,6 +124,16 @@ static inline int kmem_cache_debug(struct kmem_cache *s) #endif } +static inline bool has_sanitize(struct kmem_cache *s) +{ + return IS_ENABLED(CONFIG_SLAB_SANITIZE) && !(s->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON)); +} + +static inline bool has_sanitize_verify(struct kmem_cache *s) +{ + return IS_ENABLED(CONFIG_SLAB_SANITIZE_VERIFY) && has_sanitize(s); +} + void *fixup_red_left(struct kmem_cache *s, void *p) { if (kmem_cache_debug(s) && s->flags & SLAB_RED_ZONE) @@ -308,6 +318,35 @@ static inline void set_freepointer(struct kmem_cache *s, void *object, void *fp) *(void **)freeptr_addr = freelist_ptr(s, fp, freeptr_addr); } +#ifdef CONFIG_SLAB_CANARY +static inline unsigned long *get_canary(struct kmem_cache *s, void *object) +{ + if (s->offset) + return object + s->offset + sizeof(void *); + return object + s->inuse; +} + +static inline unsigned long get_canary_value(const void *canary, unsigned long value) +{ + return (value ^ (unsigned long)canary) & CANARY_MASK; +} + +static inline void set_canary(struct kmem_cache *s, void *object, unsigned long value) +{ + unsigned long *canary = get_canary(s, object); + *canary = get_canary_value(canary, value); +} + +static inline void check_canary(struct kmem_cache *s, void *object, unsigned long value) +{ + unsigned long *canary = get_canary(s, object); + BUG_ON(*canary != get_canary_value(canary, value)); +} +#else +#define set_canary(s, object, value) +#define check_canary(s, object, value) +#endif + /* Loop over all objects in a slab */ #define for_each_object(__p, __s, __addr, __objects) \ for (__p = fixup_red_left(__s, __addr); \ @@ -475,13 +514,13 @@ static inline void *restore_red_left(struct kmem_cache *s, void *p) * Debug settings: */ #if defined(CONFIG_SLUB_DEBUG_ON) -static slab_flags_t slub_debug = DEBUG_DEFAULT_FLAGS; +static slab_flags_t slub_debug __ro_after_init = DEBUG_DEFAULT_FLAGS; #else -static slab_flags_t slub_debug; +static slab_flags_t slub_debug __ro_after_init; #endif -static char *slub_debug_slabs; -static int disable_higher_order_debug; +static char *slub_debug_slabs __ro_after_init; +static int disable_higher_order_debug __ro_after_init; /* * slub is about to manipulate internal object metadata. This memory lies @@ -542,6 +581,9 @@ static struct track *get_track(struct kmem_cache *s, void *object, else p = object + s->inuse; + if (IS_ENABLED(CONFIG_SLAB_CANARY)) + p = (void *)p + sizeof(void *); + return p + alloc; } @@ -681,6 +723,9 @@ static void print_trailer(struct kmem_cache *s, struct page *page, u8 *p) else off = s->inuse; + if (IS_ENABLED(CONFIG_SLAB_CANARY)) + off += sizeof(void *); + if (s->flags & SLAB_STORE_USER) off += 2 * sizeof(struct track); @@ -810,6 +855,9 @@ static int check_pad_bytes(struct kmem_cache *s, struct page *page, u8 *p) /* Freepointer is placed after the object. */ off += sizeof(void *); + if (IS_ENABLED(CONFIG_SLAB_CANARY)) + off += sizeof(void *); + if (s->flags & SLAB_STORE_USER) /* We also have user information there */ off += 2 * sizeof(struct track); @@ -1475,8 +1523,9 @@ static void *setup_object(struct kmem_cache *s, struct page *page, void *object) { setup_object_debug(s, page, object); + set_canary(s, object, s->random_inactive); object = kasan_init_slab_obj(s, object); - if (unlikely(s->ctor)) { + if (unlikely(s->ctor) && !has_sanitize_verify(s)) { kasan_unpoison_object_data(s, object); s->ctor(object); kasan_poison_object_data(s, object); @@ -2750,9 +2799,21 @@ static __always_inline void *slab_alloc_node(struct kmem_cache *s, stat(s, ALLOC_FASTPATH); } - if (unlikely(gfpflags & __GFP_ZERO) && object) + if (has_sanitize_verify(s) && object) { + size_t offset = s->offset ? 0 : sizeof(void *); + BUG_ON(memchr_inv(object + offset, 0, s->object_size - offset)); + if (s->ctor) + s->ctor(object); + if (unlikely(gfpflags & __GFP_ZERO) && offset) + memset(object, 0, sizeof(void *)); + } else if (unlikely(gfpflags & __GFP_ZERO) && object) memset(object, 0, s->object_size); + if (object) { + check_canary(s, object, s->random_inactive); + set_canary(s, object, s->random_active); + } + slab_post_alloc_hook(s, gfpflags, 1, &object); return object; @@ -2959,6 +3020,27 @@ static __always_inline void do_slab_free(struct kmem_cache *s, void *tail_obj = tail ? : head; struct kmem_cache_cpu *c; unsigned long tid; + bool sanitize = has_sanitize(s); + + if (IS_ENABLED(CONFIG_SLAB_CANARY) || sanitize) { + __maybe_unused int offset = s->offset ? 0 : sizeof(void *); + void *x = head; + + while (1) { + check_canary(s, x, s->random_active); + set_canary(s, x, s->random_inactive); + + if (sanitize) { + memset(x + offset, 0, s->object_size - offset); + if (!IS_ENABLED(CONFIG_SLAB_SANITIZE_VERIFY) && s->ctor) + s->ctor(x); + } + if (x == tail_obj) + break; + x = get_freepointer(s, x); + } + } + redo: /* * Determine the currently cpus per cpu slab. @@ -3135,7 +3217,7 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size, void **p) { struct kmem_cache_cpu *c; - int i; + int i, k; /* memcg and kmem_cache debug support */ s = slab_pre_alloc_hook(s, flags); @@ -3172,13 +3254,29 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size, local_irq_enable(); /* Clear memory outside IRQ disabled fastpath loop */ - if (unlikely(flags & __GFP_ZERO)) { + if (has_sanitize_verify(s)) { + int j; + + for (j = 0; j < i; j++) { + size_t offset = s->offset ? 0 : sizeof(void *); + BUG_ON(memchr_inv(p[j] + offset, 0, s->object_size - offset)); + if (s->ctor) + s->ctor(p[j]); + if (unlikely(flags & __GFP_ZERO) && offset) + memset(p[j], 0, sizeof(void *)); + } + } else if (unlikely(flags & __GFP_ZERO)) { int j; for (j = 0; j < i; j++) memset(p[j], 0, s->object_size); } + for (k = 0; k < i; k++) { + check_canary(s, p[k], s->random_inactive); + set_canary(s, p[k], s->random_active); + } + /* memcg and kmem_cache debug support */ slab_post_alloc_hook(s, flags, size, p); return i; @@ -3210,9 +3308,9 @@ EXPORT_SYMBOL(kmem_cache_alloc_bulk); * and increases the number of allocations possible without having to * take the list_lock. */ -static unsigned int slub_min_order; -static unsigned int slub_max_order = PAGE_ALLOC_COSTLY_ORDER; -static unsigned int slub_min_objects; +static unsigned int slub_min_order __ro_after_init; +static unsigned int slub_max_order __ro_after_init = PAGE_ALLOC_COSTLY_ORDER; +static unsigned int slub_min_objects __ro_after_init; /* * Calculate the order of allocation given an slab object size. @@ -3380,6 +3478,7 @@ static void early_kmem_cache_node_alloc(int node) init_object(kmem_cache_node, n, SLUB_RED_ACTIVE); init_tracking(kmem_cache_node, n); #endif + set_canary(kmem_cache_node, n, kmem_cache_node->random_active); n = kasan_kmalloc(kmem_cache_node, n, sizeof(struct kmem_cache_node), GFP_KERNEL); page->freelist = get_freepointer(kmem_cache_node, n); @@ -3540,6 +3639,9 @@ static int calculate_sizes(struct kmem_cache *s, int forced_order) size += sizeof(void *); } + if (IS_ENABLED(CONFIG_SLAB_CANARY)) + size += sizeof(void *); + #ifdef CONFIG_SLUB_DEBUG if (flags & SLAB_STORE_USER) /* @@ -3612,6 +3714,10 @@ static int kmem_cache_open(struct kmem_cache *s, slab_flags_t flags) #ifdef CONFIG_SLAB_FREELIST_HARDENED s->random = get_random_long(); #endif +#ifdef CONFIG_SLAB_CANARY + s->random_active = get_random_long(); + s->random_inactive = get_random_long(); +#endif if (!calculate_sizes(s, -1)) goto error; @@ -3887,6 +3993,8 @@ void __check_heap_object(const void *ptr, unsigned long n, struct page *page, offset -= s->red_left_pad; } + check_canary(s, (void *)ptr - offset, s->random_active); + /* Allow address range falling entirely within usercopy region. */ if (offset >= s->useroffset && offset - s->useroffset <= s->usersize && @@ -3920,7 +4028,11 @@ static size_t __ksize(const void *object) page = virt_to_head_page(object); if (unlikely(!PageSlab(page))) { +#ifdef CONFIG_BUG_ON_DATA_CORRUPTION + BUG_ON(!PageCompound(page)); +#else WARN_ON(!PageCompound(page)); +#endif return PAGE_SIZE << compound_order(page); } @@ -4777,7 +4889,7 @@ enum slab_stat_type { #define SO_TOTAL (1 << SL_TOTAL) #ifdef CONFIG_MEMCG -static bool memcg_sysfs_enabled = IS_ENABLED(CONFIG_SLUB_MEMCG_SYSFS_ON); +static bool memcg_sysfs_enabled __ro_after_init = IS_ENABLED(CONFIG_SLUB_MEMCG_SYSFS_ON); static int __init setup_slub_memcg_sysfs(char *str) { diff --git a/mm/swap.c b/mm/swap.c index 301ed4e04320..cff1e4d6d04f 100644 --- a/mm/swap.c +++ b/mm/swap.c @@ -92,6 +92,13 @@ static void __put_compound_page(struct page *page) if (!PageHuge(page)) __page_cache_release(page); dtor = get_compound_page_dtor(page); + if (!PageHuge(page)) + BUG_ON(dtor != free_compound_page +#ifdef CONFIG_TRANSPARENT_HUGEPAGE + && dtor != free_transhuge_page +#endif + ); + (*dtor)(page); } diff --git a/net/core/dev.c b/net/core/dev.c index c6b2f6db0a9b..89b55db262a0 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -4588,7 +4588,7 @@ int netif_rx_ni(struct sk_buff *skb) } EXPORT_SYMBOL(netif_rx_ni); -static __latent_entropy void net_tx_action(struct softirq_action *h) +static __latent_entropy void net_tx_action(void) { struct softnet_data *sd = this_cpu_ptr(&softnet_data); @@ -6402,7 +6402,7 @@ static int napi_poll(struct napi_struct *n, struct list_head *repoll) return work; } -static __latent_entropy void net_rx_action(struct softirq_action *h) +static __latent_entropy void net_rx_action(void) { struct softnet_data *sd = this_cpu_ptr(&softnet_data); unsigned long time_limit = jiffies + diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig index 32cae39cdff6..9141d7ae99b2 100644 --- a/net/ipv4/Kconfig +++ b/net/ipv4/Kconfig @@ -266,6 +266,7 @@ config IP_PIMSM_V2 config SYN_COOKIES bool "IP: TCP syncookie support" + default y ---help--- Normal TCP/IP networking is open to an attack known as "SYN flooding". This denial-of-service attack prevents legitimate remote diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost index 6b7f354f189a..360b015678a7 100644 --- a/scripts/Makefile.modpost +++ b/scripts/Makefile.modpost @@ -78,6 +78,7 @@ modpost = scripts/mod/modpost \ $(if $(KBUILD_EXTRA_SYMBOLS), $(patsubst %, -e %,$(KBUILD_EXTRA_SYMBOLS))) \ $(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \ $(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \ + $(if $(CONFIG_DEBUG_WRITABLE_FUNCTION_POINTERS_VERBOSE),-f) \ $(if $(KBUILD_EXTMOD)$(KBUILD_MODPOST_WARN),-w) MODPOST_OPT=$(subst -i,-n,$(filter -i,$(MAKEFLAGS))) diff --git a/scripts/gcc-plugins/Kconfig b/scripts/gcc-plugins/Kconfig index 74271dba4f94..21c842d26556 100644 --- a/scripts/gcc-plugins/Kconfig +++ b/scripts/gcc-plugins/Kconfig @@ -59,6 +59,11 @@ config GCC_PLUGIN_LATENT_ENTROPY is some slowdown of the boot process (about 0.5%) and fork and irq processing. + When extra_latent_entropy is passed on the kernel command line, + entropy will be extracted from up to the first 4GB of RAM while the + runtime memory allocator is being initialized. This costs even more + slowdown of the boot process. + Note that entropy extracted this way is not cryptographically secure! diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index f277e116e0eb..f93c582acc69 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -36,6 +36,8 @@ static int warn_unresolved = 0; /* How a symbol is exported */ static int sec_mismatch_count = 0; static int sec_mismatch_fatal = 0; +static int writable_fptr_count = 0; +static int writable_fptr_verbose = 0; /* ignore missing files */ static int ignore_missing_files; @@ -953,6 +955,7 @@ enum mismatch { ANY_EXIT_TO_ANY_INIT, EXPORT_TO_INIT_EXIT, EXTABLE_TO_NON_TEXT, + DATA_TO_TEXT }; /** @@ -1079,6 +1082,12 @@ static const struct sectioncheck sectioncheck[] = { .good_tosec = {ALL_TEXT_SECTIONS , NULL}, .mismatch = EXTABLE_TO_NON_TEXT, .handler = extable_mismatch_handler, +}, +/* Do not reference code from writable data */ +{ + .fromsec = { DATA_SECTIONS, NULL }, + .bad_tosec = { ALL_TEXT_SECTIONS, NULL }, + .mismatch = DATA_TO_TEXT } }; @@ -1266,10 +1275,10 @@ static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr, continue; if (!is_valid_name(elf, sym)) continue; - if (sym->st_value == addr) - return sym; /* Find a symbol nearby - addr are maybe negative */ d = sym->st_value - addr; + if (d == 0) + return sym; if (d < 0) d = addr - sym->st_value; if (d < distance) { @@ -1404,7 +1413,13 @@ static void report_sec_mismatch(const char *modname, char *prl_from; char *prl_to; - sec_mismatch_count++; + if (mismatch->mismatch == DATA_TO_TEXT) { + writable_fptr_count++; + if (!writable_fptr_verbose) + return; + } else { + sec_mismatch_count++; + } get_pretty_name(from_is_func, &from, &from_p); get_pretty_name(to_is_func, &to, &to_p); @@ -1526,6 +1541,12 @@ static void report_sec_mismatch(const char *modname, fatal("There's a special handler for this mismatch type, " "we should never get here."); break; + case DATA_TO_TEXT: + fprintf(stderr, + "The %s %s:%s references\n" + "the %s %s:%s%s\n", + from, fromsec, fromsym, to, tosec, tosym, to_p); + break; } fprintf(stderr, "\n"); } @@ -2428,7 +2449,7 @@ int main(int argc, char **argv) struct ext_sym_list *extsym_iter; struct ext_sym_list *extsym_start = NULL; - while ((opt = getopt(argc, argv, "i:I:e:mnsT:o:awE")) != -1) { + while ((opt = getopt(argc, argv, "i:I:e:fmnsT:o:awE")) != -1) { switch (opt) { case 'i': kernel_read = optarg; @@ -2445,6 +2466,9 @@ int main(int argc, char **argv) extsym_iter->file = optarg; extsym_start = extsym_iter; break; + case 'f': + writable_fptr_verbose = 1; + break; case 'm': modversions = 1; break; @@ -2521,6 +2545,11 @@ int main(int argc, char **argv) fatal("modpost: Section mismatches detected.\n" "Set CONFIG_SECTION_MISMATCH_WARN_ONLY=y to allow them.\n"); free(buf.p); + if (writable_fptr_count && !writable_fptr_verbose) + warn("modpost: Found %d writable function pointer%s.\n" + "To see full details build your kernel with:\n" + "'make CONFIG_DEBUG_WRITABLE_FUNCTION_POINTERS_VERBOSE=y'\n", + writable_fptr_count, (writable_fptr_count == 1 ? "" : "s")); return err; } diff --git a/security/Kconfig b/security/Kconfig index 353cfef71d4e..d6b7f1d89985 100644 --- a/security/Kconfig +++ b/security/Kconfig @@ -8,7 +8,7 @@ source "security/keys/Kconfig" config SECURITY_DMESG_RESTRICT bool "Restrict unprivileged access to the kernel syslog" - default n + default y help This enforces restrictions on unprivileged users reading the kernel syslog via dmesg(8). @@ -18,10 +18,34 @@ config SECURITY_DMESG_RESTRICT If you are unsure how to answer this question, answer N. +config SECURITY_PERF_EVENTS_RESTRICT + bool "Restrict unprivileged use of performance events" + depends on PERF_EVENTS + default y + help + If you say Y here, the kernel.perf_event_paranoid sysctl + will be set to 3 by default, and no unprivileged use of the + perf_event_open syscall will be permitted unless it is + changed. + +config SECURITY_TIOCSTI_RESTRICT + bool "Restrict unprivileged use of tiocsti command injection" + default y + help + This enforces restrictions on unprivileged users injecting commands + into other processes which share a tty session using the TIOCSTI + ioctl. This option makes TIOCSTI use require CAP_SYS_ADMIN. + + If this option is not selected, no restrictions will be enforced + unless the tiocsti_restrict sysctl is explicitly set to (1). + + If you are unsure how to answer this question, answer N. + config SECURITY bool "Enable different security models" depends on SYSFS depends on MULTIUSER + default y help This allows you to choose different security modules to be configured into your kernel. @@ -47,6 +71,7 @@ config SECURITYFS config SECURITY_NETWORK bool "Socket and Networking Security Hooks" depends on SECURITY + default y help This enables the socket and networking security hooks. If enabled, a security module can use these hooks to @@ -153,6 +178,7 @@ config HARDENED_USERCOPY bool "Harden memory copies between kernel and userspace" depends on HAVE_HARDENED_USERCOPY_ALLOCATOR imply STRICT_DEVMEM + default y help This option checks for obviously wrong memory regions when copying memory to/from the kernel (via copy_to_user() and @@ -165,7 +191,6 @@ config HARDENED_USERCOPY config HARDENED_USERCOPY_FALLBACK bool "Allow usercopy whitelist violations to fallback to object size" depends on HARDENED_USERCOPY - default y help This is a temporary option that allows missing usercopy whitelists to be discovered via a WARN() to the kernel log, instead of @@ -190,10 +215,36 @@ config HARDENED_USERCOPY_PAGESPAN config FORTIFY_SOURCE bool "Harden common str/mem functions against buffer overflows" depends on ARCH_HAS_FORTIFY_SOURCE + default y help Detect overflows of buffers in common string and memory functions where the compiler can determine and validate the buffer sizes. +config FORTIFY_SOURCE_STRICT_STRING + bool "Harden common functions against buffer overflows" + depends on FORTIFY_SOURCE + depends on EXPERT + help + Perform stricter overflow checks catching overflows within objects + for common C string functions rather than only between objects. + + This is not yet intended for production use, only bug finding. + +config PAGE_SANITIZE + bool "Sanitize pages" + default y + help + Zero fill page allocations on free, reducing the lifetime of + sensitive data and helping to mitigate use-after-free bugs. + +config PAGE_SANITIZE_VERIFY + bool "Verify sanitized pages" + depends on PAGE_SANITIZE + default y + help + Verify that newly allocated pages are zeroed to detect + write-after-free bugs. + config STATIC_USERMODEHELPER bool "Force all usermode helper calls through a single binary" help diff --git a/security/selinux/Kconfig b/security/selinux/Kconfig index 55f032f1fc2d..7275fde1218d 100644 --- a/security/selinux/Kconfig +++ b/security/selinux/Kconfig @@ -2,7 +2,7 @@ config SECURITY_SELINUX bool "NSA SELinux Support" depends on SECURITY_NETWORK && AUDIT && NET && INET select NETWORK_SECMARK - default n + default y help This selects NSA Security-Enhanced Linux (SELinux). You will also need a policy configuration and a labeled filesystem. @@ -64,23 +64,3 @@ config SECURITY_SELINUX_AVC_STATS This option collects access vector cache statistics to /selinux/avc/cache_stats, which may be monitored via tools such as avcstat. - -config SECURITY_SELINUX_CHECKREQPROT_VALUE - int "NSA SELinux checkreqprot default value" - depends on SECURITY_SELINUX - range 0 1 - default 0 - help - This option sets the default value for the 'checkreqprot' flag - that determines whether SELinux checks the protection requested - by the application or the protection that will be applied by the - kernel (including any implied execute for read-implies-exec) for - mmap and mprotect calls. If this option is set to 0 (zero), - SELinux will default to checking the protection that will be applied - by the kernel. If this option is set to 1 (one), SELinux will - default to checking the protection requested by the application. - The checkreqprot flag may be changed from the default via the - 'checkreqprot=' boot parameter. It may also be changed at runtime - via /selinux/checkreqprot if authorized by policy. - - If you are unsure how to answer this question, answer 0. diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 614bc753822c..8c68df47483e 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -134,18 +134,7 @@ static int __init selinux_enabled_setup(char *str) __setup("selinux=", selinux_enabled_setup); #endif -static unsigned int selinux_checkreqprot_boot = - CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; - -static int __init checkreqprot_setup(char *str) -{ - unsigned long checkreqprot; - - if (!kstrtoul(str, 0, &checkreqprot)) - selinux_checkreqprot_boot = checkreqprot ? 1 : 0; - return 1; -} -__setup("checkreqprot=", checkreqprot_setup); +static const unsigned int selinux_checkreqprot_boot; /** * selinux_secmark_enabled - Check to see if SECMARK is currently enabled diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c index 145ee62f205a..8a42d6a531a8 100644 --- a/security/selinux/selinuxfs.c +++ b/security/selinux/selinuxfs.c @@ -640,7 +640,6 @@ static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { - struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; char *page; ssize_t length; unsigned int new_value; @@ -664,10 +663,9 @@ static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, return PTR_ERR(page); length = -EINVAL; - if (sscanf(page, "%u", &new_value) != 1) + if (sscanf(page, "%u", &new_value) != 1 || new_value) goto out; - fsi->state->checkreqprot = new_value ? 1 : 0; length = count; out: kfree(page); diff --git a/security/yama/Kconfig b/security/yama/Kconfig index 96b27405558a..485c1b85c325 100644 --- a/security/yama/Kconfig +++ b/security/yama/Kconfig @@ -1,7 +1,7 @@ config SECURITY_YAMA bool "Yama support" depends on SECURITY - default n + default y help This selects Yama, which extends DAC support with additional system-wide security settings beyond regular Linux discretionary