This is a note to let you know that I've just added the patch titled
arm64/ptrace: Preserve previous registers for short regset write - 2
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm64-ptrace-preserve-previous-registers-for-short-regset-write-2.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 9dd73f72f218320c6c90da5f834996e7360dc227 Mon Sep 17 00:00:00 2001
From: Dave Martin <Dave.Martin@xxxxxxx>
Date: Wed, 18 Jan 2017 16:25:21 +0000
Subject: arm64/ptrace: Preserve previous registers for short regset write - 2
From: Dave Martin <Dave.Martin@xxxxxxx>
commit 9dd73f72f218320c6c90da5f834996e7360dc227 upstream.
Ensure that if userspace supplies insufficient data to
PTRACE_SETREGSET to fill all the registers, the thread's old
registers are preserved.
Fixes: 766a85d7bc5d ("arm64: ptrace: add NT_ARM_SYSTEM_CALL regset")
Signed-off-by: Dave Martin <Dave.Martin@xxxxxxx>
Acked-by: Will Deacon <Will.Deacon@xxxxxxx>
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/kernel/ptrace.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -576,7 +576,8 @@ static int system_call_set(struct task_s
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
- int syscallno, ret;
+ int syscallno = task_pt_regs(target)->syscallno;
+ int ret;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &syscallno, 0, -1);
if (ret)
Patches currently in stable-queue which might be from Dave.Martin@xxxxxxx are
queue-4.4/arm64-ptrace-preserve-previous-registers-for-short-regset-write-3.patch
queue-4.4/arm64-ptrace-reject-attempts-to-set-incomplete-hardware-breakpoint-fields.patch
queue-4.4/arm64-ptrace-preserve-previous-registers-for-short-regset-write-2.patch
queue-4.4/arm64-ptrace-avoid-uninitialised-struct-padding-in-fpr_set.patch
queue-4.4/arm64-ptrace-preserve-previous-registers-for-short-regset-write.patch
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