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

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

[gregkh]

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

    sparc/ptrace: Preserve previous registers for 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:
     sparc-ptrace-preserve-previous-registers-for-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 <stable@vger.kernel.org> know about it.


>From d3805c546b275c8cc7d40f759d029ae92c7175f2 Mon Sep 17 00:00:00 2001
From: Dave Martin <Dave.Martin@arm.com>
Date: Mon, 27 Mar 2017 15:10:59 +0100
Subject: sparc/ptrace: Preserve previous registers for short regset write

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

commit d3805c546b275c8cc7d40f759d029ae92c7175f2 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>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/sparc/kernel/ptrace_64.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/sparc/kernel/ptrace_64.c
+++ b/arch/sparc/kernel/ptrace_64.c
@@ -313,7 +313,7 @@ static int genregs64_set(struct task_str
 	}
 
 	if (!ret) {
-		unsigned long y;
+		unsigned long y = regs->y;
 
 		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 					 &y,


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

queue-4.9/metag-ptrace-reject-partial-nt_metag_rpipe-writes.patch
queue-4.9/metag-ptrace-preserve-previous-registers-for-short-regset-write.patch
queue-4.9/metag-ptrace-provide-default-txstatus-for-short-nt_prstatus.patch
queue-4.9/c6x-ptrace-remove-useless-ptrace_setregset-implementation.patch
queue-4.9/mips-ptrace-preserve-previous-registers-for-short-regset-write.patch
queue-4.9/h8300-ptrace-fix-incorrect-register-transfer-count.patch
queue-4.9/sparc-ptrace-preserve-previous-registers-for-short-regset-write.patch