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x86: guarantee brk gap is at least one page

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Per PaX, but for this alternate brk randomization approach.

Signed-off-by: Daniel Micay <danielmicay@gmail.com>
This commit is contained in:
Daniel Micay 2017-06-01 03:23:48 -04:00 committed by Levente Polyak
parent 0f853f4de2
commit 9a1446a4f3
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GPG key ID: FC1B547C8D8172C8
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kernel/process.c
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@ -995,9 +995,9 @@ unsigned long arch_align_stack(unsigned long sp)
unsigned long arch_randomize_brk(struct mm_struct *mm)
{
if (mmap_is_ia32())
return mm->brk + get_random_long() % SZ_32M;
return mm->brk + get_random_long() % SZ_32M + PAGE_SIZE;
else
return mm->brk + get_random_long() % SZ_1G;
return mm->brk + get_random_long() % SZ_1G + PAGE_SIZE;
}
/*