releases/4.19.35/parisc-also-set-iaoq_b-in-instruction_pointer_set.patch

   1 From f324fa58327791b2696628b31480e7e21c745706 Mon Sep 17 00:00:00 2001
   2 From: Sven Schnelle <svens@stackframe.org>
   3 Date: Thu, 4 Apr 2019 18:16:04 +0200
   4 Subject: parisc: also set iaoq_b in instruction_pointer_set()
   5
   6 From: Sven Schnelle <svens@stackframe.org>
   7
   8 commit f324fa58327791b2696628b31480e7e21c745706 upstream.
   9
  10 When setting the instruction pointer on PA-RISC we also need
  11 to set the back of the instruction queue to the new offset, otherwise
  12 we will execute on instruction from the new location, and jumping
  13 back to the old location stored in iaoq_b.
  14
  15 Signed-off-by: Sven Schnelle <svens@stackframe.org>
  16 Signed-off-by: Helge Deller <deller@gmx.de>
  17 Fixes: 75ebedf1d263 ("parisc: Add HAVE_REGS_AND_STACK_ACCESS_API feature")
  18 Cc: stable@vger.kernel.org # 4.19+
  19 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  20
  21 ---
  22  arch/parisc/include/asm/ptrace.h |    3 ++-
  23  1 file changed, 2 insertions(+), 1 deletion(-)
  24
  25 --- a/arch/parisc/include/asm/ptrace.h
  26 +++ b/arch/parisc/include/asm/ptrace.h
  27 @@ -28,7 +28,8 @@ static inline unsigned long regs_return_
  28  static inline void instruction_pointer_set(struct pt_regs *regs,
  29                                                 unsigned long val)
  30  {
  31 -        regs->iaoq[0] = val;
  32 +       regs->iaoq[0] = val;
  33 +       regs->iaoq[1] = val + 4;
  34  }
  35
  36  /* Query offset/name of register from its name/offset */