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Message-Id: <20160730154244.403-5-jason@lakedaemon.net>
Date: Sat, 30 Jul 2016 15:42:41 +0000
From: Jason Cooper <jason@...edaemon.net>
To: william.c.roberts@...el.com,
Yann Droneaud <ydroneaud@...eya.com>,
linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
kernel-hardening@...ts.openwall.com
Cc: linux@....linux.org.uk,
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arnd@...db.de,
gregkh@...uxfoundation.org,
catalin.marinas@....com,
will.deacon@....com,
ralf@...ux-mips.org,
benh@...nel.crashing.org,
paulus@...ba.org,
mpe@...erman.id.au,
davem@...emloft.net,
tglx@...utronix.de,
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Jason Cooper <jason@...edaemon.net>
Subject: [PATCH v2 4/7] 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.
Signed-off-by: Jason Cooper <jason@...edaemon.net>
Acked-by: Will Deacon <will.deacon@....com>
---
Changes from v1:
- Add Ack for arm64 (Will Deacon)
arch/arm64/kernel/process.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index 6cd2612236dc..11bf454baf86 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -374,12 +374,8 @@ 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_addr(mm->brk, 0x02000000);
else
- range_end += 0x40000000;
-
- return randomize_range(mm->brk, range_end, 0) ? : mm->brk;
+ return randomize_addr(mm->brk, 0x40000000);
}
--
2.9.2
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