* + arm64-use-simpler-api-for-random-address-requests.patch added to -mm tree
@ 2016-08-03 23:57 akpm
0 siblings, 0 replies; only message in thread
From: akpm @ 2016-08-03 23:57 UTC (permalink / raw)
To: jason, catalin.marinas, keescook, linux, will.deacon, mm-commits
The patch titled
Subject: arm64: use simpler API for random address requests
has been added to the -mm tree. Its filename is
arm64-use-simpler-api-for-random-address-requests.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/arm64-use-simpler-api-for-random-address-requests.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/arm64-use-simpler-api-for-random-address-requests.patch
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------------------------------------------------------
From: Jason Cooper <jason@lakedaemon.net>
Subject: 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>
Cc: 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>
---
arch/arm64/kernel/process.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff -puN arch/arm64/kernel/process.c~arm64-use-simpler-api-for-random-address-requests arch/arm64/kernel/process.c
--- a/arch/arm64/kernel/process.c~arm64-use-simpler-api-for-random-address-requests
+++ a/arch/arm64/kernel/process.c
@@ -374,12 +374,8 @@ unsigned long arch_align_stack(unsigned
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;
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2016-08-03 23:57 + arm64-use-simpler-api-for-random-address-requests.patch added to -mm tree akpm
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