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Commit 990cb8ac authored by Nicolas Pitre's avatar Nicolas Pitre
Browse files

[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: default avatarNicolas Pitre <nicolas.pitre@linaro.org>
parent 7e27d6e7

arch/arm/include/asm/elf.h

+3 −0
Original line number Diff line number Diff line
@@ -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

arch/arm/kernel/process.c

+7 −0
Original line number Diff line number Diff line
@@ -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;

}