diff options
| author | V3n3RiX <venerix@redcorelinux.org> | 2020-02-11 09:12:04 +0000 |
|---|---|---|
| committer | V3n3RiX <venerix@redcorelinux.org> | 2020-02-11 09:12:04 +0000 |
| commit | 1f371d486086841a999a54b85603b12a8bd96c14 (patch) | |
| tree | 80bfb4a49c5bcf1f28e99531e3965fe0bff3b36c /sys-kernel/linux-sources-redcore/files/5.4-linux-hardened.patch | |
| parent | d59503ca861641625e1e004363e6c856198a68e7 (diff) | |
sys-kernel : move kernel 5.14.xx to sys-kernel/linux-{image,sources}-redcore-lts
Diffstat (limited to 'sys-kernel/linux-sources-redcore/files/5.4-linux-hardened.patch')
| -rw-r--r-- | sys-kernel/linux-sources-redcore/files/5.4-linux-hardened.patch | 2832 |
1 files changed, 0 insertions, 2832 deletions
diff --git a/sys-kernel/linux-sources-redcore/files/5.4-linux-hardened.patch b/sys-kernel/linux-sources-redcore/files/5.4-linux-hardened.patch deleted file mode 100644 index 699f56b2..00000000 --- a/sys-kernel/linux-sources-redcore/files/5.4-linux-hardened.patch +++ /dev/null @@ -1,2832 +0,0 @@ -diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt -index f5a551e4332d..a0d202674a43 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/common_io.rst for details. - clk_ignore_unused -@@ -3345,6 +3335,11 @@ - 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/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst -index 032c7cd3cede..cc3491b05976 100644 ---- a/Documentation/admin-guide/sysctl/kernel.rst -+++ b/Documentation/admin-guide/sysctl/kernel.rst -@@ -102,6 +102,7 @@ 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 -@@ -1114,6 +1115,25 @@ thread structures would occupy too much (more than 1/8th) of the - 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: - ================== - -diff --git a/arch/Kconfig b/arch/Kconfig -index 5f8a5d84dbbe..60103a76d33e 100644 ---- a/arch/Kconfig -+++ b/arch/Kconfig -@@ -653,7 +653,7 @@ 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 -@@ -687,7 +687,7 @@ 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 -@@ -906,6 +906,7 @@ 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 3f047afb982c..869d4b0ee141 100644 ---- a/arch/arm64/Kconfig -+++ b/arch/arm64/Kconfig -@@ -1138,6 +1138,7 @@ config RODATA_FULL_DEFAULT_ENABLED - - 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 -@@ -1537,6 +1538,7 @@ 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 cf09010d825f..dc4083ceff57 100644 ---- a/arch/arm64/Kconfig.debug -+++ b/arch/arm64/Kconfig.debug -@@ -43,6 +43,7 @@ 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 c9a867ac32d4..5c4d264f6a6e 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 b618017205a3..0a228dbcad65 100644 ---- a/arch/arm64/include/asm/elf.h -+++ b/arch/arm64/include/asm/elf.h -@@ -103,14 +103,10 @@ - - /* - * 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__ - -@@ -164,10 +160,10 @@ 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/x86/Kconfig b/arch/x86/Kconfig -index 8ef85139553f..e16076b30625 100644 ---- a/arch/x86/Kconfig -+++ b/arch/x86/Kconfig -@@ -1219,8 +1219,7 @@ 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 -@@ -2365,7 +2364,7 @@ config COMPAT_VDSO - choice - prompt "vsyscall table for legacy applications" - depends on X86_64 -- default LEGACY_VSYSCALL_XONLY -+ 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 -@@ -2461,8 +2460,7 @@ 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 bf9cd83de777..13ef90f3de52 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 d0a5ffeae8df..2a91d4a9f640 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 f5937742b290..6655ce228e25 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 6f66d841262d..b786e7cb395d 100644 ---- a/arch/x86/include/asm/tlbflush.h -+++ b/arch/x86/include/asm/tlbflush.h -@@ -295,6 +295,7 @@ static inline void cr4_set_bits_irqsoff(unsigned long mask) - unsigned long cr4; - - cr4 = this_cpu_read(cpu_tlbstate.cr4); -+ BUG_ON(cr4 != __read_cr4()); - if ((cr4 | mask) != cr4) - __cr4_set(cr4 | mask); - } -@@ -305,6 +306,7 @@ static inline void cr4_clear_bits_irqsoff(unsigned long mask) - unsigned long cr4; - - cr4 = this_cpu_read(cpu_tlbstate.cr4); -+ BUG_ON(cr4 != __read_cr4()); - if ((cr4 & ~mask) != cr4) - __cr4_set(cr4 & ~mask); - } -@@ -334,6 +336,7 @@ 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); - } - -@@ -440,6 +443,7 @@ 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 fffe21945374..e9e124eb6ccb 100644 ---- a/arch/x86/kernel/cpu/common.c -+++ b/arch/x86/kernel/cpu/common.c -@@ -1854,7 +1854,6 @@ 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 5e94c4354d4e..093bd8ad1130 100644 ---- a/arch/x86/kernel/process.c -+++ b/arch/x86/kernel/process.c -@@ -42,6 +42,8 @@ - #include <asm/prctl.h> - #include <asm/spec-ctrl.h> - #include <asm/proto.h> -+#include <asm/elf.h> -+#include <linux/sizes.h> - - #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 930edeb41ec3..d80d2577af6a 100644 ---- a/arch/x86/mm/init_32.c -+++ b/arch/x86/mm/init_32.c -@@ -560,9 +560,9 @@ 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 a6b5c653727b..24981a11b92a 100644 ---- a/arch/x86/mm/init_64.c -+++ b/arch/x86/mm/init_64.c -@@ -97,9 +97,9 @@ DEFINE_ENTRY(pte, pte, init) - */ - - /* 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 28c492be0a57..6cf8c9ffda79 100644 ---- a/drivers/ata/libata-core.c -+++ b/drivers/ata/libata-core.c -@@ -5143,7 +5143,7 @@ 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; -@@ -5160,7 +5160,7 @@ 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 df0fc997dc3e..bd8eed8de6c1 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 -@@ -514,7 +513,6 @@ 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 c7623f99ac0f..859c2782c8e2 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 802c1210558f..0cc320f33cdc 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); - } - -@@ -2180,11 +2181,19 @@ 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)) -@@ -3004,6 +3013,7 @@ 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/usb/core/hub.c b/drivers/usb/core/hub.c -index dfe9ac8d2375..add80b1e4c91 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. */ -@@ -4990,6 +4992,12 @@ 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 c27231234764..4038334db213 100644 ---- a/fs/exec.c -+++ b/fs/exec.c -@@ -63,6 +63,7 @@ - #include <linux/oom.h> - #include <linux/compat.h> - #include <linux/vmalloc.h> -+#include <linux/random.h> - - #include <linux/uaccess.h> - #include <asm/mmu_context.h> -@@ -276,6 +277,8 @@ 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 671c3c1a3425..618ef0b5d000 100644 ---- a/fs/namei.c -+++ b/fs/namei.c -@@ -877,10 +877,10 @@ 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 295a7a21b774..3aed361bc0f9 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 cb5629bd5fff..bc44606fcc48 100644 ---- a/fs/proc/Kconfig -+++ b/fs/proc/Kconfig -@@ -41,7 +41,6 @@ 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/fs/userfaultfd.c b/fs/userfaultfd.c -index f9fd18670e22..d16e48bed451 100644 ---- a/fs/userfaultfd.c -+++ b/fs/userfaultfd.c -@@ -28,7 +28,11 @@ - #include <linux/security.h> - #include <linux/hugetlb.h> - -+#ifdef CONFIG_USERFAULTFD_UNPRIVILEGED - int sysctl_unprivileged_userfaultfd __read_mostly = 1; -+#else -+int sysctl_unprivileged_userfaultfd __read_mostly; -+#endif - - static struct kmem_cache *userfaultfd_ctx_cachep __read_mostly; - -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 0b4d8fc79e0f..6f318e089249 100644 ---- a/include/linux/fs.h -+++ b/include/linux/fs.h -@@ -3627,4 +3627,15 @@ static inline int inode_drain_writes(struct inode *inode) - return filemap_write_and_wait(inode->i_mapping); - } - -+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 a2d5d175d3c1..e91ab06119b0 100644 ---- a/include/linux/fsnotify.h -+++ b/include/linux/fsnotify.h -@@ -233,6 +233,9 @@ 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; - -@@ -249,6 +252,9 @@ 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 61f2f6ff9467..f9b3e3d675ae 100644 ---- a/include/linux/gfp.h -+++ b/include/linux/gfp.h -@@ -553,9 +553,9 @@ 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 89fc59dab57d..5f98e14e9470 100644 ---- a/include/linux/interrupt.h -+++ b/include/linux/interrupt.h -@@ -540,7 +540,7 @@ 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); -@@ -555,7 +555,7 @@ 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 a2adf95b3f9c..6f6c068e645d 100644 ---- a/include/linux/mm.h -+++ b/include/linux/mm.h -@@ -664,7 +664,7 @@ 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 5e76af742c80..9a6c682ec127 100644 ---- a/include/linux/percpu.h -+++ b/include/linux/percpu.h -@@ -123,7 +123,7 @@ 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); - -@@ -131,8 +131,8 @@ 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 68ccc5b1913b..a7565ea44938 100644 ---- a/include/linux/perf_event.h -+++ b/include/linux/perf_event.h -@@ -1241,6 +1241,11 @@ 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 4d2a2fa55ed5..be3a8234edde 100644 ---- a/include/linux/slab.h -+++ b/include/linux/slab.h -@@ -184,8 +184,8 @@ void memcg_deactivate_kmem_caches(struct mem_cgroup *, 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 *); -@@ -390,7 +390,7 @@ 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 *); - -@@ -414,7 +414,7 @@ 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) -@@ -539,7 +539,7 @@ 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 -@@ -581,7 +581,7 @@ 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 b6ccdc2c7f02..6d66b8740f90 100644 ---- a/include/linux/string.h -+++ b/include/linux/string.h -@@ -268,10 +268,16 @@ 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) -@@ -281,7 +287,7 @@ __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) -@@ -292,7 +298,7 @@ __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 || -@@ -307,7 +313,7 @@ __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__); -@@ -319,8 +325,8 @@ 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); -@@ -340,8 +346,8 @@ __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); -@@ -454,8 +460,8 @@ __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 <uapi/linux/tty.h> - #include <linux/rwsem.h> - #include <linux/llist.h> -+#include <linux/user_namespace.h> - - - /* -@@ -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 4e7809408073..0b58a5176a25 100644 ---- a/include/linux/vmalloc.h -+++ b/include/linux/vmalloc.h -@@ -88,19 +88,19 @@ static inline void vmalloc_init(void) - static inline unsigned long vmalloc_nr_pages(void) { return 0; } - #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 b4daad2bac23..c1016fd960f0 100644 ---- a/init/Kconfig -+++ b/init/Kconfig -@@ -381,6 +381,7 @@ 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 -@@ -1118,6 +1119,22 @@ config USER_NS - - If unsure, say N. - -+config USER_NS_UNPRIVILEGED -+ bool "Allow unprivileged users to create namespaces" -+ depends on USER_NS -+ default n -+ help -+ When disabled, unprivileged users will not be able to create -+ new namespaces. Allowing users to create their own namespaces -+ has been part of several recent local privilege escalation -+ exploits, so if you need user namespaces but are -+ paranoid^Wsecurity-conscious you want to disable this. -+ -+ This setting can be overridden at runtime via the -+ kernel.unprivileged_userns_clone sysctl. -+ -+ If unsure, say N. -+ - config PID_NS - bool "PID Namespaces" - default y -@@ -1538,8 +1555,7 @@ 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 -@@ -1650,6 +1666,23 @@ config USERFAULTFD - Enable the userfaultfd() system call that allows to intercept and - handle page faults in userland. - -+config USERFAULTFD_UNPRIVILEGED -+ bool "Allow unprivileged users to use the userfaultfd syscall" -+ depends on USERFAULTFD -+ default n -+ help -+ When disabled, unprivileged users will not be able to use the userfaultfd -+ syscall. Userfaultfd provide attackers with a way to stall a kernel -+ thread in the middle of memory accesses from userspace by initiating an -+ access on an unmapped page. To avoid various heap grooming and heap -+ spraying techniques for exploiting use-after-free flaws this should be -+ disabled by default. -+ -+ This setting can be overridden at runtime via the -+ vm.unprivileged_userfaultfd sysctl. -+ -+ If unsure, say N. -+ - config ARCH_HAS_MEMBARRIER_CALLBACKS - bool - -@@ -1762,7 +1795,7 @@ 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 -@@ -1786,7 +1819,6 @@ 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). -@@ -1833,7 +1865,6 @@ 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. -@@ -1846,9 +1877,9 @@ 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 -@@ -1857,12 +1888,30 @@ 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 - sacrifices to harden the kernel slab allocator against common - freelist exploit methods. - -+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 SHUFFLE_PAGE_ALLOCATOR - bool "Page allocator randomization" - default SLAB_FREELIST_RANDOM && ACPI_NUMA -diff --git a/kernel/audit.c b/kernel/audit.c -index da8dc0db5bd3..62dda6867dd9 100644 ---- a/kernel/audit.c -+++ b/kernel/audit.c -@@ -1628,6 +1628,9 @@ 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 ef0e1e3e66f4..d1ddc8695ab8 100644 ---- a/kernel/bpf/core.c -+++ b/kernel/bpf/core.c -@@ -519,7 +519,7 @@ 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 ace1cfaa24b6..37e08fc44a6b 100644 ---- a/kernel/bpf/syscall.c -+++ b/kernel/bpf/syscall.c -@@ -39,7 +39,7 @@ 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 00a014670ed0..2f177466f34b 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 */ -@@ -10897,6 +10902,9 @@ 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 6cabc124378c..fda4986da9eb 100644 ---- a/kernel/fork.c -+++ b/kernel/fork.c -@@ -106,6 +106,11 @@ - - #define CREATE_TRACE_POINTS - #include <trace/events/task.h> -+#ifdef CONFIG_USER_NS -+extern int unprivileged_userns_clone; -+#else -+#define unprivileged_userns_clone 0 -+#endif - - /* - * Minimum number of threads to boot the kernel -@@ -1779,6 +1784,10 @@ 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. -@@ -2826,6 +2835,12 @@ 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 83105874f255..0951ee9d0b9a 100644 ---- a/kernel/power/snapshot.c -+++ b/kernel/power/snapshot.c -@@ -1140,10 +1140,12 @@ void free_basic_memory_bitmaps(void) - - void clear_free_pages(void) - { --#ifdef CONFIG_PAGE_POISONING_ZERO - struct memory_bitmap *bm = free_pages_map; - unsigned long pfn; - -+ if (!IS_ENABLED(CONFIG_PAGE_POISONING_ZERO) && !want_init_on_free()) -+ return; -+ - if (WARN_ON(!(free_pages_map))) - return; - -@@ -1157,7 +1159,6 @@ void clear_free_pages(void) - } - memory_bm_position_reset(bm); - pr_info("free pages cleared after restore\n"); --#endif /* PAGE_POISONING_ZERO */ - } - - /** -diff --git a/kernel/rcu/tiny.c b/kernel/rcu/tiny.c -index 477b4eb44af5..db28cc3fd301 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 81105141b6a8..38f04f653d29 100644 ---- a/kernel/rcu/tree.c -+++ b/kernel/rcu/tree.c -@@ -2381,7 +2381,7 @@ static __latent_entropy void rcu_core(void) - trace_rcu_utilization(TPS("End RCU core")); - } - --static void rcu_core_si(struct softirq_action *h) -+static void rcu_core_si(void) - { - rcu_core(); - } -diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c -index 69a81a5709ff..915bc17a97bc 100644 ---- a/kernel/sched/fair.c -+++ b/kernel/sched/fair.c -@@ -9876,7 +9876,7 @@ int newidle_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 0427a86743a4..5e6a9b4ccb41 100644 ---- a/kernel/softirq.c -+++ b/kernel/softirq.c -@@ -52,7 +52,7 @@ 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); - -@@ -289,7 +289,7 @@ 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", -@@ -452,7 +452,7 @@ 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; - } -@@ -498,8 +498,7 @@ 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; -@@ -536,14 +535,14 @@ 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 b6f2f35d0bcf..8d13b2fc5ec4 100644 ---- a/kernel/sysctl.c -+++ b/kernel/sysctl.c -@@ -68,6 +68,7 @@ - #include <linux/bpf.h> - #include <linux/mount.h> - #include <linux/userfaultfd_k.h> -+#include <linux/tty.h> - - #include "../lib/kstrtox.h" - -@@ -104,12 +105,19 @@ - #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; -@@ -121,32 +129,32 @@ 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 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 __maybe_unused neg_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; - - /* -@@ -154,9 +162,12 @@ 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 <linux/inotify.h> - #endif -@@ -301,19 +312,19 @@ 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[] = { -@@ -546,6 +557,15 @@ 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", -@@ -901,6 +921,37 @@ static struct ctl_table kern_table[] = { - .extra1 = SYSCTL_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 = SYSCTL_ZERO, -+ .extra2 = SYSCTL_ONE, -+ }, -+#endif -+ { -+ .procname = "device_sidechannel_restrict", -+ .data = &device_sidechannel_restrict, -+ .maxlen = sizeof(int), -+ .mode = 0644, -+ .proc_handler = proc_dointvec_minmax_sysadmin, -+ .extra1 = SYSCTL_ZERO, -+ .extra2 = SYSCTL_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 = SYSCTL_ZERO, -+ .extra2 = SYSCTL_ONE, -+ }, - #endif - { - .procname = "ngroups_max", -diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c -index 65605530ee34..1553604b6a78 100644 ---- a/kernel/time/hrtimer.c -+++ b/kernel/time/hrtimer.c -@@ -1580,7 +1580,7 @@ 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 4820823515e9..1a61e5aa87ae 100644 ---- a/kernel/time/timer.c -+++ b/kernel/time/timer.c -@@ -1779,7 +1779,7 @@ 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 8eadadc478f9..c36ecd19562c 100644 ---- a/kernel/user_namespace.c -+++ b/kernel/user_namespace.c -@@ -21,6 +21,13 @@ - #include <linux/bsearch.h> - #include <linux/sort.h> - -+/* sysctl */ -+#ifdef CONFIG_USER_NS_UNPRIVILEGED -+int unprivileged_userns_clone = 1; -+#else -+int unprivileged_userns_clone; -+#endif -+ - 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 93d97f9b0157..fb923cae2120 100644 ---- a/lib/Kconfig.debug -+++ b/lib/Kconfig.debug -@@ -352,6 +352,9 @@ 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 -@@ -974,6 +977,7 @@ 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 -@@ -983,7 +987,7 @@ 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 -@@ -1352,6 +1356,7 @@ 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. -@@ -2073,6 +2078,7 @@ 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 -@@ -2112,6 +2118,7 @@ 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 83198cb37d8d..4a053b7aef42 100644 ---- a/lib/kobject.c -+++ b/lib/kobject.c -@@ -1009,9 +1009,9 @@ 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 cace9b307781..39ba1387045d 100644 ---- a/lib/nlattr.c -+++ b/lib/nlattr.c -@@ -571,6 +571,8 @@ 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 e78017a3e1bd..ac5a5b5a439b 100644 ---- a/lib/vsprintf.c -+++ b/lib/vsprintf.c -@@ -771,7 +771,7 @@ static char *ptr_to_id(char *buf, char *end, const void *ptr, - return pointer_string(buf, end, (const void *)hashval, 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 a5dae9a7eb51..0a3070c5a125 100644 ---- a/mm/Kconfig -+++ b/mm/Kconfig -@@ -303,7 +303,8 @@ 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 a7d8c84d19b7..4b8d4c645cde 100644 ---- a/mm/mmap.c -+++ b/mm/mmap.c -@@ -236,6 +236,13 @@ 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 f391c0c4ed1d..64b66144f5ee 100644 ---- a/mm/page_alloc.c -+++ b/mm/page_alloc.c -@@ -68,6 +68,7 @@ - #include <linux/lockdep.h> - #include <linux/nmi.h> - #include <linux/psi.h> -+#include <linux/random.h> - - #include <asm/sections.h> - #include <asm/tlbflush.h> -@@ -106,6 +107,15 @@ 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); -@@ -1434,6 +1444,25 @@ 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; -@@ -1448,7 +1477,6 @@ 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); -@@ -1499,6 +1527,7 @@ 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); - } - -@@ -1589,6 +1618,7 @@ 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; - } -@@ -1596,6 +1626,7 @@ 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); - } - } -@@ -2167,6 +2198,12 @@ 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) && want_init_on_free()) { -+ int i; -+ for (i = 0; i < (1 << order); i++) -+ verify_zero_highpage(page + i); -+ } -+ - if (!free_pages_prezeroed() && want_init_on_alloc(gfp_flags)) - kernel_init_free_pages(page, 1 << order); - -diff --git a/mm/slab.h b/mm/slab.h -index b2b01694dc43..b531661095a2 100644 ---- a/mm/slab.h -+++ b/mm/slab.h -@@ -470,9 +470,13 @@ static inline struct kmem_cache *virt_to_cache(const void *obj) - struct page *page; - - page = virt_to_head_page(obj); -+#ifdef CONFIG_BUG_ON_DATA_CORRUPTION -+ BUG_ON(!PageSlab(page)); -+#else - if (WARN_ONCE(!PageSlab(page), "%s: Object is not a Slab page!\n", - __func__)) - return NULL; -+#endif - return page->slab_cache; - } - -@@ -518,9 +522,14 @@ static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x) - return s; - - cachep = virt_to_cache(x); -- WARN_ONCE(cachep && !slab_equal_or_root(cachep, s), -- "%s: Wrong slab cache. %s but object is from %s\n", -- __func__, s->name, cachep->name); -+ if (cachep && !slab_equal_or_root(cachep, s)) { -+#ifdef CONFIG_BUG_ON_DATA_CORRUPTION -+ BUG(); -+#else -+ WARN_ONCE(1, "%s: Wrong slab cache. %s but object is from %s\n", -+ __func__, s->name, cachep->name); -+#endif -+ } - return cachep; - } - -@@ -545,7 +554,7 @@ 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 -@@ -674,8 +683,10 @@ static inline void cache_random_seq_destroy(struct kmem_cache *cachep) { } - static inline bool slab_want_init_on_alloc(gfp_t flags, struct kmem_cache *c) - { - if (static_branch_unlikely(&init_on_alloc)) { -+#ifndef CONFIG_SLUB - if (c->ctor) - return false; -+#endif - if (c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON)) - return flags & __GFP_ZERO; - return true; -@@ -685,9 +696,15 @@ static inline bool slab_want_init_on_alloc(gfp_t flags, struct kmem_cache *c) - - static inline bool slab_want_init_on_free(struct kmem_cache *c) - { -- if (static_branch_unlikely(&init_on_free)) -- return !(c->ctor || -- (c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON))); -+ if (static_branch_unlikely(&init_on_free)) { -+#ifndef CONFIG_SLUB -+ if (c->ctor) -+ return false; -+#endif -+ if (c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON)) -+ return false; -+ return true; -+ } - return false; - } - -diff --git a/mm/slab_common.c b/mm/slab_common.c -index 78402b362df9..6f13ba0e81e8 100644 ---- a/mm/slab_common.c -+++ b/mm/slab_common.c -@@ -28,10 +28,10 @@ - - #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 = -@@ -59,7 +59,7 @@ 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 e72e802fc569..23a714ea4343 100644 ---- a/mm/slub.c -+++ b/mm/slub.c -@@ -125,6 +125,12 @@ static inline int kmem_cache_debug(struct kmem_cache *s) - #endif - } - -+static inline bool has_sanitize_verify(struct kmem_cache *s) -+{ -+ return IS_ENABLED(CONFIG_SLAB_SANITIZE_VERIFY) && -+ slab_want_init_on_free(s); -+} -+ - void *fixup_red_left(struct kmem_cache *s, void *p) - { - if (kmem_cache_debug(s) && s->flags & SLAB_RED_ZONE) -@@ -309,6 +315,35 @@ 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); \ -@@ -476,13 +511,13 @@ 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 -@@ -543,6 +578,9 @@ 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; - } - -@@ -673,6 +711,9 @@ 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); - -@@ -802,6 +843,9 @@ 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); -@@ -1441,6 +1485,8 @@ static inline bool slab_free_freelist_hook(struct kmem_cache *s, - object = next; - next = get_freepointer(s, object); - -+ check_canary(s, object, s->random_active); -+ - if (slab_want_init_on_free(s)) { - /* - * Clear the object and the metadata, but don't touch -@@ -1451,8 +1497,12 @@ static inline bool slab_free_freelist_hook(struct kmem_cache *s, - : 0; - memset((char *)object + s->inuse, 0, - s->size - s->inuse - rsize); -- -+ if (!IS_ENABLED(CONFIG_SLAB_SANITIZE_VERIFY) && s->ctor) -+ s->ctor(object); - } -+ -+ set_canary(s, object, s->random_inactive); -+ - /* If object's reuse doesn't have to be delayed */ - if (!slab_free_hook(s, object)) { - /* Move object to the new freelist */ -@@ -1460,6 +1510,17 @@ static inline bool slab_free_freelist_hook(struct kmem_cache *s, - *head = object; - if (!*tail) - *tail = object; -+ } else if (slab_want_init_on_free(s) && s->ctor) { -+ /* Objects that are put into quarantine by KASAN will -+ * still undergo free_consistency_checks() and thus -+ * need to show a valid freepointer to check_object(). -+ * -+ * Note that doing this for all caches (not just ctor -+ * ones, which have s->offset != NULL)) causes a GPF, -+ * due to KASAN poisoning and the way set_freepointer() -+ * eventually dereferences the freepointer. -+ */ -+ set_freepointer(s, object, NULL); - } - } while (object != old_tail); - -@@ -1473,8 +1534,9 @@ 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); -@@ -2752,8 +2814,28 @@ static __always_inline void *slab_alloc_node(struct kmem_cache *s, - - maybe_wipe_obj_freeptr(s, object); - -- if (unlikely(slab_want_init_on_alloc(gfpflags, s)) && object) -+ if (has_sanitize_verify(s) && object) { -+ /* KASAN hasn't unpoisoned the object yet (this is done in the -+ * post-alloc hook), so let's do it temporarily. -+ */ -+ kasan_unpoison_object_data(s, object); -+ BUG_ON(memchr_inv(object, 0, s->object_size)); -+ if (s->ctor) -+ s->ctor(object); -+ kasan_poison_object_data(s, object); -+ } else if (unlikely(slab_want_init_on_alloc(gfpflags, s)) && object) { - memset(object, 0, s->object_size); -+ if (s->ctor) { -+ kasan_unpoison_object_data(s, object); -+ s->ctor(object); -+ kasan_poison_object_data(s, object); -+ } -+ } -+ -+ if (object) { -+ check_canary(s, object, s->random_inactive); -+ set_canary(s, object, s->random_active); -+ } - - slab_post_alloc_hook(s, gfpflags, 1, &object); - -@@ -3136,7 +3218,7 @@ 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); -@@ -3176,11 +3258,35 @@ 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(slab_want_init_on_alloc(flags, s))) { -+ if (has_sanitize_verify(s)) { - int j; - -- for (j = 0; j < i; j++) -+ for (j = 0; j < i; j++) { -+ /* KASAN hasn't unpoisoned the object yet (this is done -+ * in the post-alloc hook), so let's do it temporarily. -+ */ -+ kasan_unpoison_object_data(s, p[j]); -+ BUG_ON(memchr_inv(p[j], 0, s->object_size)); -+ if (s->ctor) -+ s->ctor(p[j]); -+ kasan_poison_object_data(s, p[j]); -+ } -+ } else if (unlikely(slab_want_init_on_alloc(flags, s))) { -+ int j; -+ -+ for (j = 0; j < i; j++) { - memset(p[j], 0, s->object_size); -+ if (s->ctor) { -+ kasan_unpoison_object_data(s, p[j]); -+ s->ctor(p[j]); -+ kasan_poison_object_data(s, p[j]); -+ } -+ } -+ } -+ -+ 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 */ -@@ -3214,9 +3320,9 @@ 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. -@@ -3384,6 +3490,7 @@ 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); -@@ -3544,6 +3651,9 @@ 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) - /* -@@ -3616,6 +3726,10 @@ 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; -@@ -3891,6 +4005,8 @@ 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 && -@@ -3924,7 +4040,11 @@ 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(page); - } - -@@ -4769,7 +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 38c3fa4308e2..0534c2e348c2 100644 ---- a/mm/swap.c -+++ b/mm/swap.c -@@ -94,6 +94,13 @@ 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/mm/util.c b/mm/util.c -index 3ad6db9a722e..80209685f67c 100644 ---- a/mm/util.c -+++ b/mm/util.c -@@ -325,9 +325,9 @@ unsigned long arch_randomize_brk(struct mm_struct *mm) - { - /* Is the current task 32bit ? */ - if (!IS_ENABLED(CONFIG_64BIT) || is_compat_task()) -- return randomize_page(mm->brk, SZ_32M); -+ return mm->brk + get_random_long() % SZ_32M + PAGE_SIZE; - -- return randomize_page(mm->brk, SZ_1G); -+ return mm->brk + get_random_long() % SZ_1G + PAGE_SIZE; - } - - unsigned long arch_mmap_rnd(void) -diff --git a/net/core/dev.c b/net/core/dev.c -index 046307445ece..5de4da30565c 100644 ---- a/net/core/dev.c -+++ b/net/core/dev.c -@@ -4492,7 +4492,7 @@ 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); - -@@ -6353,7 +6353,7 @@ 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 03381f3e12ba..8ea409f37436 100644 ---- a/net/ipv4/Kconfig -+++ b/net/ipv4/Kconfig -@@ -267,6 +267,7 @@ 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 952fff485546..59ffccdb1be4 100644 ---- a/scripts/Makefile.modpost -+++ b/scripts/Makefile.modpost -@@ -54,6 +54,7 @@ MODPOST = scripts/mod/modpost \ - $(if $(KBUILD_EXTMOD),$(addprefix -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_MODPOST_WARN),-w) \ - $(if $(filter nsdeps,$(MAKECMDGOALS)),-d) - -diff --git a/scripts/gcc-plugins/Kconfig b/scripts/gcc-plugins/Kconfig -index d33de0b9f4f5..b7071438b0ab 100644 ---- a/scripts/gcc-plugins/Kconfig -+++ b/scripts/gcc-plugins/Kconfig -@@ -62,6 +62,11 @@ 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 d2a30a7b3f07..ff57a5fe8029 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; - /* write namespace dependencies */ -@@ -1019,6 +1021,7 @@ enum mismatch { - ANY_EXIT_TO_ANY_INIT, - EXPORT_TO_INIT_EXIT, - EXTABLE_TO_NON_TEXT, -+ DATA_TO_TEXT - }; - - /** -@@ -1145,6 +1148,12 @@ 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 - } - }; - -@@ -1332,10 +1341,10 @@ 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) { -@@ -1470,7 +1479,13 @@ 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); -@@ -1592,6 +1607,12 @@ 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"); - } -@@ -2569,7 +2590,7 @@ 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:awEd")) != -1) { -+ while ((opt = getopt(argc, argv, "i:I:e:fmnsT:o:awEd")) != -1) { - switch (opt) { - case 'i': - kernel_read = optarg; -@@ -2586,6 +2607,9 @@ 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; -@@ -2692,6 +2716,11 @@ int main(int argc, char **argv) - } - - 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 2a1a2d396228..3b7a71410f88 100644 ---- a/security/Kconfig -+++ b/security/Kconfig -@@ -9,7 +9,7 @@ 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). -@@ -19,10 +19,34 @@ 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. -@@ -48,6 +72,7 @@ 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 -@@ -154,6 +179,7 @@ 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 -@@ -166,7 +192,6 @@ 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 -@@ -191,10 +216,21 @@ 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 STATIC_USERMODEHELPER - bool "Force all usermode helper calls through a single binary" - help -diff --git a/security/Kconfig.hardening b/security/Kconfig.hardening -index af4c979b38ee..473e40bb8537 100644 ---- a/security/Kconfig.hardening -+++ b/security/Kconfig.hardening -@@ -169,6 +169,7 @@ config STACKLEAK_RUNTIME_DISABLE - - config INIT_ON_ALLOC_DEFAULT_ON - bool "Enable heap memory zeroing on allocation by default" -+ default yes - help - This has the effect of setting "init_on_alloc=1" on the kernel - command line. This can be disabled with "init_on_alloc=0". -@@ -181,6 +182,7 @@ config INIT_ON_ALLOC_DEFAULT_ON - - config INIT_ON_FREE_DEFAULT_ON - bool "Enable heap memory zeroing on free by default" -+ default yes - help - This has the effect of setting "init_on_free=1" on the kernel - command line. This can be disabled with "init_on_free=0". -@@ -196,6 +198,20 @@ config INIT_ON_FREE_DEFAULT_ON - touching "cold" memory areas. Most cases see 3-5% impact. Some - synthetic workloads have measured as high as 8%. - -+config PAGE_SANITIZE_VERIFY -+ bool "Verify sanitized pages" -+ default y -+ help -+ When init_on_free is enabled, verify that newly allocated pages -+ are zeroed to detect write-after-free bugs. -+ -+config SLAB_SANITIZE_VERIFY -+ default y -+ bool "Verify sanitized SLAB allocations" -+ help -+ When init_on_free is enabled, verify that newly allocated slab -+ objects are zeroed to detect write-after-free bugs. -+ - endmenu - - endmenu -diff --git a/security/selinux/Kconfig b/security/selinux/Kconfig -index 5711689deb6a..fab0cb896907 100644 ---- a/security/selinux/Kconfig -+++ b/security/selinux/Kconfig -@@ -3,7 +3,7 @@ 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. -@@ -65,23 +65,3 @@ 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 9625b99e677f..daa40da7a8f9 100644 ---- a/security/selinux/hooks.c -+++ b/security/selinux/hooks.c -@@ -135,18 +135,7 @@ 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 e6c7643c3fc0..0e8217f72c5a 100644 ---- a/security/selinux/selinuxfs.c -+++ b/security/selinux/selinuxfs.c -@@ -639,7 +639,6 @@ 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; -@@ -663,10 +662,9 @@ 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 a810304123ca..b809050b25d2 100644 ---- a/security/yama/Kconfig -+++ b/security/yama/Kconfig -@@ -2,7 +2,7 @@ - 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 |