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[ARM] implement arch_randomize_brk()

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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 <nicolas.pitre@linaro.org>
This commit is contained in:
Nicolas Pitre 2010-06-14 16:27:19 -04:00
parent 7e27d6e778
commit 990cb8acf2
2 changed files with 10 additions and 0 deletions
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3
arch/arm/include/asm/elf.h
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@ -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

7
arch/arm/kernel/process.c
View File

@ -28,6 +28,7 @@
#include <linux/tick.h>
#include <linux/utsname.h>
#include <linux/uaccess.h>
#include <linux/random.h>
#include <asm/leds.h>
#include <asm/processor.h>
@ -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;
}