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[v3,3/7] ARM: Use simpler API for random address requests

Message ID 20160803233913.32511-4-jason@lakedaemon.net (mailing list archive)
State New, archived
Headers show

Commit Message

Jason Cooper Aug. 3, 2016, 11:39 p.m. UTC
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

Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Changes from v2:
 - s/randomize_addr/randomize_page/ (Kees Cook)

 arch/arm/kernel/process.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
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diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 4a803c5a1ff7..3ee2fb4c9ae6 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -314,8 +314,7 @@  unsigned long get_wchan(struct task_struct *p)
 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;
+	return randomize_page(mm->brk, 0x02000000);
 #ifdef CONFIG_MMU