releases/4.4.46/tile-ptrace-preserve-previous-registers-for-short-regset-write.patch

   1 From fd7c99142d77dc4a851879a66715abf12a3193fb Mon Sep 17 00:00:00 2001
   2 From: Dave Martin <Dave.Martin@arm.com>
   3 Date: Fri, 6 Jan 2017 17:54:51 +0000
   4 Subject: tile/ptrace: Preserve previous registers for short regset write
   5
   6 From: Dave Martin <Dave.Martin@arm.com>
   7
   8 commit fd7c99142d77dc4a851879a66715abf12a3193fb upstream.
   9
  10 Ensure that if userspace supplies insufficient data to
  11 PTRACE_SETREGSET to fill all the registers, the thread's old
  12 registers are preserved.
  13
  14 Signed-off-by: Dave Martin <Dave.Martin@arm.com>
  15 Signed-off-by: Chris Metcalf <cmetcalf@mellanox.com>
  16 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  17
  18 ---
  19  arch/tile/kernel/ptrace.c |    2 +-
  20  1 file changed, 1 insertion(+), 1 deletion(-)
  21
  22 --- a/arch/tile/kernel/ptrace.c
  23 +++ b/arch/tile/kernel/ptrace.c
  24 @@ -111,7 +111,7 @@ static int tile_gpr_set(struct task_stru
  25                           const void *kbuf, const void __user *ubuf)
  26  {
  27         int ret;
  28 -       struct pt_regs regs;
  29 +       struct pt_regs regs = *task_pt_regs(target);
  30
  31         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &regs, 0,
  32                                  sizeof(regs));