toolchain/glibc/patches/001-regex-read-overrun.patch

   1 commit 583dd860d5b833037175247230a328f0050dbfe9
   2 Author: Paul Eggert <eggert@cs.ucla.edu>
   3 Date:   Mon Jan 21 11:08:13 2019 -0800
   4
   5     regex: fix read overrun [BZ #24114]
   6
   7     Problem found by AddressSanitizer, reported by Hongxu Chen in:
   8     https://debbugs.gnu.org/34140
   9     * posix/regexec.c (proceed_next_node):
  10     Do not read past end of input buffer.
  11
  12 --- a/posix/regexec.c
  13 +++ b/posix/regexec.c
  14 @@ -1293,8 +1293,10 @@ proceed_next_node (const re_match_context_t *mctx, Idx nregs, regmatch_t *regs,
  15               else if (naccepted)
  16                 {
  17                   char *buf = (char *) re_string_get_buffer (&mctx->input);
  18 -                 if (memcmp (buf + regs[subexp_idx].rm_so, buf + *pidx,
  19 -                             naccepted) != 0)
  20 +                 if (mctx->input.valid_len - *pidx < naccepted
  21 +                     || (memcmp (buf + regs[subexp_idx].rm_so, buf + *pidx,
  22 +                                 naccepted)
  23 +                         != 0))
  24                     return -1;
  25                 }
  26             }