Patch "powerpc/ptrace: Preserve previous TM fprs/vsrs on short regset write" 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

powerpc/ptrace: Preserve previous TM fprs/vsrs on short regset write

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:
powerpc-ptrace-preserve-previous-tm-fprs-vsrs-on-short-regset-write.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: Thu, 5 Jan 2017 16:50:57 +0000
Subject: powerpc/ptrace: Preserve previous TM fprs/vsrs on short regset write

From: Dave Martin <[email protected]>

commit b34ca60148c53971d373643195cc5c4d5d20be78 upstream.

Ensure that if userspace supplies insufficient data to PTRACE_SETREGSET to fill all the check pointed registers, the thread's old check pointed registers are preserved.

---
 arch/powerpc/kernel/ptrace.c |    7 +++++++
 1 file changed, 7 insertions(+)

@@ -1026,6 +1026,10 @@ static int tm_cfpr_set(struct task_struc
 	flush_fp_to_thread(target);
 	flush_altivec_to_thread(target);
 
+	for (i = 0; i < 32; i++)
+		buf[i] = target->thread.TS_CKFPR(i);
+	buf[32] = target->thread.ckfp_state.fpscr;
+
 	/* copy to local buffer then write that out */
 	i = user_regset_copyin(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
 	if (i)

@@ -1290,6 +1294,9 @@ static int tm_cvsx_set(struct task_struc
 	flush_altivec_to_thread(target);
 	flush_vsx_to_thread(target);
 
+	for (i = 0; i < 32 ; i++)
+		buf[i] = target->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET];
+
 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 				 buf, 0, 32 * sizeof(double));
 	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