From 990cb8acf23cab19a2930f1ed5e7dc108f89079b Mon Sep 17 00:00:00 2001 From: Nicolas Pitre Date: Mon, 14 Jun 2010 16:27:19 -0400 Subject: [PATCH] [ARM] implement arch_randomize_brk() For this feature to take effect, CONFIG_COMPAT_BRK must be turned off. This can safely be turned off for any EABI user space versions. Signed-off-by: Nicolas Pitre --- arch/arm/include/asm/elf.h | 3 +++ arch/arm/kernel/process.c | 7 +++++++ 2 files changed, 10 insertions(+) diff --git a/arch/arm/include/asm/elf.h b/arch/arm/include/asm/elf.h index 51662fe..0a96e8c 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/kernel/process.c b/arch/arm/kernel/process.c index acf5e6f..1c6eb7e 100644 --- a/arch/arm/kernel/process.c +++ b/arch/arm/kernel/process.c @@ -28,6 +28,7 @@ #include #include #include +#include #include #include @@ -421,3 +422,9 @@ unsigned long get_wchan(struct task_struct *p) } while (count ++ < 16); return 0; } + +unsigned long arch_randomize_brk(struct mm_struct *mm) +{ + unsigned long range_end = mm->brk + 0x02000000; + return randomize_range(mm->brk, range_end, 0) ? : mm->brk; +} -- 2.7.4