Patch "tile/ptrace: Preserve previous registers for short regset write" has been added to the 4.4-stable tree

Patch "tile/ptrace: Preserve previous registers for short regset write" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    tile/ptrace: Preserve previous registers for short regset write

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:
     tile-ptrace-preserve-previous-registers-for-short-regset-write.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@vger.kernel.org> know about it.


>From fd7c99142d77dc4a851879a66715abf12a3193fb Mon Sep 17 00:00:00 2001
From: Dave Martin <Dave.Martin@arm.com>
Date: Fri, 6 Jan 2017 17:54:51 +0000
Subject: tile/ptrace: Preserve previous registers for short regset write

From: Dave Martin <Dave.Martin@arm.com>

commit fd7c99142d77dc4a851879a66715abf12a3193fb upstream.

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

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Chris Metcalf <cmetcalf@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/tile/kernel/ptrace.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/tile/kernel/ptrace.c
+++ b/arch/tile/kernel/ptrace.c
@@ -111,7 +111,7 @@ static int tile_gpr_set(struct task_stru
 			  const void *kbuf, const void __user *ubuf)
 {
 	int ret;
-	struct pt_regs regs;
+	struct pt_regs regs = *task_pt_regs(target);
 
 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &regs, 0,
 				 sizeof(regs));


Patches currently in stable-queue which might be from Dave.Martin@arm.com are

queue-4.4/tile-ptrace-preserve-previous-registers-for-short-regset-write.patch