Patch "arm64/ptrace: Preserve previous registers for short regset write - 2" has been added to the 4.9-stable tree

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 4.9-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-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Dave Martin <[email protected]>
Date: Wed, 18 Jan 2017 16:25:21 +0000
Subject: arm64/ptrace: Preserve previous registers for short regset write - 2

From: Dave Martin <[email protected]>

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.

---
 arch/arm64/kernel/ptrace.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

@@ -676,7 +676,8 @@ 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 [email protected] are

queue-4.9/arm64-ptrace-preserve-previous-registers-for-short-regset-write-3.patch queue-4.9/arm64-ptrace-reject-attempts-to-set-incomplete-hardware-breakpoint-fields.patch queue-4.9/powerpc-ptrace-preserve-previous-tm-fprs-vsrs-on-short-regset-write.patch queue-4.9/arm64-ptrace-preserve-previous-registers-for-short-regset-write-2.patch queue-4.9/arm64-ptrace-avoid-uninitialised-struct-padding-in-fpr_set.patch queue-4.9/arm64-ptrace-preserve-previous-registers-for-short-regset-write.patch queue-4.9/powerpc-ptrace-preserve-previous-fprs-vsrs-on-short-regset-write.patch