commit fd7c99142d77dc4a851879a66715abf12a3193fb
author Dave Martin <Dave.Martin@arm.com> Fri Jan 06 17:54:51 2017 +0000
committer Chris Metcalf <cmetcalf@mellanox.com> Fri Jan 06 15:14:08 2017 -0500
tree 5fe0d6f6b165d867bb76c296c0afbb5b22c52f47
parent 0c744ea4f77d72b3dcebb7a8f2684633ec79be88

tile/ptrace: Preserve previous registers for short regset write

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

Cc: stable@vger.kernel.org
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Chris Metcalf <cmetcalf@mellanox.com>

arch/tile/kernel/ptrace.c

diff --git a/arch/tile/kernel/ptrace.c b/arch/tile/kernel/ptrace.c
index d89b701..e279572 100644
--- a/arch/tile/kernel/ptrace.c
+++ b/arch/tile/kernel/ptrace.c
@@ -111,7 +111,7 @@
 			  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));