forked from Minki/linux
[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 <nicolas.pitre@linaro.org>
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@ -121,4 +121,7 @@ int dump_task_regs(struct task_struct *t, elf_gregset_t *elfregs);
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extern void elf_set_personality(const struct elf32_hdr *);
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#define SET_PERSONALITY(ex) elf_set_personality(&(ex))
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extern unsigned long arch_randomize_brk(struct mm_struct *mm);
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#define arch_randomize_brk arch_randomize_brk
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#endif
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@ -28,6 +28,7 @@
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#include <linux/tick.h>
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#include <linux/utsname.h>
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#include <linux/uaccess.h>
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#include <linux/random.h>
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#include <asm/leds.h>
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#include <asm/processor.h>
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@ -421,3 +422,9 @@ unsigned long get_wchan(struct task_struct *p)
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} while (count ++ < 16);
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return 0;
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}
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unsigned long arch_randomize_brk(struct mm_struct *mm)
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{
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unsigned long range_end = mm->brk + 0x02000000;
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return randomize_range(mm->brk, range_end, 0) ? : mm->brk;
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}
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