diff options
author | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-06-30 11:00:01 +0100 |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-06-30 11:00:01 +0100 |
commit | fc4978b796e5e52ab3a709495a968199afe0a108 (patch) | |
tree | 102c74707940214f3c9810dadaf62d0d378a7a8c /arch/arm/include | |
parent | 3260e5293727f16ffdce9a6a6203fd9a6b149e58 (diff) | |
parent | df0698be14c6683606d5df2d83e3ae40f85ed0d9 (diff) |
Merge git://git.linaro.org/nico/arm_security into devel-stable
Diffstat (limited to 'arch/arm/include')
-rw-r--r-- | arch/arm/include/asm/elf.h | 3 | ||||
-rw-r--r-- | arch/arm/include/asm/stackprotector.h | 38 |
2 files changed, 41 insertions, 0 deletions
diff --git a/arch/arm/include/asm/elf.h b/arch/arm/include/asm/elf.h index 51662feb9f1d..0a96e8c1b82a 100644 --- a/arch/arm/include/asm/elf.h +++ b/arch/arm/include/asm/elf.h @@ -121,4 +121,7 @@ int dump_task_regs(struct task_struct *t, elf_gregset_t *elfregs); extern void elf_set_personality(const struct elf32_hdr *); #define SET_PERSONALITY(ex) elf_set_personality(&(ex)) +extern unsigned long arch_randomize_brk(struct mm_struct *mm); +#define arch_randomize_brk arch_randomize_brk + #endif diff --git a/arch/arm/include/asm/stackprotector.h b/arch/arm/include/asm/stackprotector.h new file mode 100644 index 000000000000..de003327be97 --- /dev/null +++ b/arch/arm/include/asm/stackprotector.h @@ -0,0 +1,38 @@ +/* + * GCC stack protector support. + * + * Stack protector works by putting predefined pattern at the start of + * the stack frame and verifying that it hasn't been overwritten when + * returning from the function. The pattern is called stack canary + * and gcc expects it to be defined by a global variable called + * "__stack_chk_guard" on ARM. This unfortunately means that on SMP + * we cannot have a different canary value per task. + */ + +#ifndef _ASM_STACKPROTECTOR_H +#define _ASM_STACKPROTECTOR_H 1 + +#include <linux/random.h> +#include <linux/version.h> + +extern unsigned long __stack_chk_guard; + +/* + * Initialize the stackprotector canary value. + * + * NOTE: this must only be called from functions that never return, + * and it must always be inlined. + */ +static __always_inline void boot_init_stack_canary(void) +{ + unsigned long canary; + + /* Try to get a semi random initial value. */ + get_random_bytes(&canary, sizeof(canary)); + canary ^= LINUX_VERSION_CODE; + + current->stack_canary = canary; + __stack_chk_guard = current->stack_canary; +} + +#endif /* _ASM_STACKPROTECTOR_H */ |