toolchain/binutils/patches/2.29.1/xtensa-fix-memory-corruption-by-broken-sysregs.patch

   1 From 3c8788dbb70b40e737d4b8e30cab81406e5c5091 Mon Sep 17 00:00:00 2001
   2 From: Max Filippov <jcmvbkbc@gmail.com>
   3 Date: Wed, 2 Aug 2017 00:36:05 -0700
   4 Subject: [PATCH] xtensa: fix memory corruption by broken sysregs
   5
   6 In some xtensa configurations there may be system/user registers in
   7 xtensa-modules with negative index. ISA initialization for such config
   8 may clobber heap and result in program termination.
   9 Don't update lookup table entries for register with negative indices.
  10 They are not directly accessible via RSR/WSR/XSR or RUR/WUR, so this
  11 change should not affect processing of valid assembly/binary code.
  12
  13 bfd/
  14 2017-08-02  Max Filippov  <jcmvbkbc@gmail.com>
  15
  16         * xtensa-isa.c (xtensa_isa_init): Don't update lookup table
  17         entries for sysregs with negative indices.
  18
  19 Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
  20 ---
  21 Backported from: d84ed528d4817b0ff854006b65a9f6ec75f0407a
  22
  23  bfd/xtensa-isa.c | 3 ++-
  24  1 file changed, 2 insertions(+), 1 deletion(-)
  25
  26 diff --git a/bfd/xtensa-isa.c b/bfd/xtensa-isa.c
  27 index 8da75bea8109..8c6ee88fdeae 100644
  28 --- a/bfd/xtensa-isa.c
  29 +++ b/bfd/xtensa-isa.c
  30 @@ -292,7 +292,8 @@ xtensa_isa_init (xtensa_isa_status *errno_p, char **error_msg_p)
  31        xtensa_sysreg_internal *sreg = &isa->sysregs[n];
  32        is_user = sreg->is_user;
  33
  34 -      isa->sysreg_table[is_user][sreg->number] = n;
  35 +      if (sreg->number >= 0)
  36 +       isa->sysreg_table[is_user][sreg->number] = n;
  37      }
  38
  39    /* Set up the interface lookup table.  */
  40 --
  41 2.1.4
  42