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authorJason Cooper <jason@lakedaemon.net>2016-10-11 23:54:02 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-10-12 01:06:32 +0300
commitfa5114c78c596e977af04865b697b7fcb092a0fb (patch)
treeff9131f0a1d43ec14b2be1e61e352947272b0229 /arch
parentc984cbf2e34cd622b5531f776029f7b23ff17e50 (diff)
downloadlinux-fa5114c78c596e977af04865b697b7fcb092a0fb.tar.xz
arm64: use simpler API for random address requests
Currently, all callers to randomize_range() set the length to 0 and calculate end by adding a constant to the start address. We can simplify the API to remove a bunch of needless checks and variables. Use the new randomize_addr(start, range) call to set the requested address. Link: http://lkml.kernel.org/r/20160803233913.32511-5-jason@lakedaemon.net Signed-off-by: Jason Cooper <jason@lakedaemon.net> Acked-by: Will Deacon <will.deacon@arm.com> Acked-by: Kees Cook <keescook@chromium.org> Cc: "Russell King - ARM Linux" <linux@arm.linux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm64/kernel/process.c8
1 files changed, 2 insertions, 6 deletions
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index a4f5f766af08..27b2f1387df4 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -372,12 +372,8 @@ unsigned long arch_align_stack(unsigned long sp)
unsigned long arch_randomize_brk(struct mm_struct *mm)
{
- unsigned long range_end = mm->brk;
-
if (is_compat_task())
- range_end += 0x02000000;
+ return randomize_page(mm->brk, 0x02000000);
else
- range_end += 0x40000000;
-
- return randomize_range(mm->brk, range_end, 0) ? : mm->brk;
+ return randomize_page(mm->brk, 0x40000000);
}