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bug#56108: 29.0.50; ASAN use-after-free in re_match_2_internal
From: |
Gerd Möllmann |
Subject: |
bug#56108: 29.0.50; ASAN use-after-free in re_match_2_internal |
Date: |
Mon, 20 Jun 2022 16:07:55 +0200 |
FWIW, here is another non-reproducible crash with ASAN.
In short, shrink_regexp_cache realloc'd something leading to a malloc +
free, and something is still holding a pointer the old memory. Or so it
looks to me.
=22069==ERROR: AddressSanitizer: heap-use-after-free on address 0x000105b493a5
at pc 0x00010057549c bp 0x00016fde0b90 sp 0x00016fde0b88
READ of size 1 at 0x000105b493a5 thread T0
#0 0x100575498 in re_match_2_internal regex-emacs.c:5021
#1 0x100568c38 in rpl_re_search_2 regex-emacs.c:3382
#2 0x1005678c4 in rpl_re_search regex-emacs.c:3176
#3 0x10054cc68 in fast_string_match_internal search.c:489
#4 0x1004f20b0 in fast_string_match lisp.h:4747
#5 0x1004f1b28 in Ffind_file_name_handler fileio.c:324
#6 0x1004f82d4 in Fexpand_file_name fileio.c:1018
#7 0x1006ddc50 in openp lread.c:1849
#8 0x1006dae98 in Fload lread.c:1312
#9 0x1006e3c64 in save_match_data_load lread.c:1641
#10 0x1006408d0 in load_with_autoload_queue eval.c:2245
#11 0x100677534 in Frequire fns.c:3146
0x000105b493a5 is located 293 bytes inside of 558-byte region
[0x000105b49280,0x000105b494ae)
freed by thread T0 here:
#0 0x1031c7ddc in wrap_realloc+0x9c
(libclang_rt.asan_osx_dynamic.dylib:arm64e+0x3fddc)
#1 0x100598388 in lrealloc alloc.c:1376
#2 0x1005982c4 in xrealloc alloc.c:790
#3 0x10054a490 in shrink_regexp_cache search.c:150
#4 0x1005aaeb0 in garbage_collect alloc.c:6172
#5 0x1005aa6cc in maybe_garbage_collect alloc.c:6088
#6 0x1006416c0 in maybe_gc lisp.h:5548
#7 0x10063a99c in Ffuncall eval.c:2948
#8 0x10064a144 in funcall_nil eval.c:2635
#9 0x10064a0b4 in run_hook_with_args eval.c:2812
#10 0x100649b84 in Frun_hook_with_args eval.c:2677
#11 0x100649ad0 in run_hook eval.c:2825
#12 0x1004da650 in signal_before_change insdel.c:2155
#13 0x1004d9c40 in prepare_to_modify_buffer_1 insdel.c:2009
#14 0x1004c810c in prepare_to_modify_buffer insdel.c:2020
#15 0x1005081ec in Finsert_file_contents fileio.c:4601
#16 0x10064b758 in funcall_subr eval.c:2999
#17 0x10072fa40 in exec_byte_code bytecode.c:809
#18 0x10065361c in fetch_and_exec_byte_code eval.c:3040
#19 0x10064c344 in funcall_lambda eval.c:3112
#20 0x10064ac18 in funcall_general eval.c:2903
#21 0x10063aa70 in Ffuncall eval.c:2953
#22 0x100643c0c in Fapply eval.c:2577
#23 0x10064bde0 in funcall_subr eval.c:3018
#24 0x10072fa40 in exec_byte_code bytecode.c:809
#25 0x10065361c in fetch_and_exec_byte_code eval.c:3040
#26 0x10064c344 in funcall_lambda eval.c:3112
#27 0x1006437c0 in apply_lambda eval.c:3062
#28 0x100633734 in eval_sub eval.c:2503
#29 0x100640ef8 in Feval eval.c:2314
previously allocated by thread T0 here:
#0 0x1031c7ddc in wrap_realloc+0x9c
(libclang_rt.asan_osx_dynamic.dylib:arm64e+0x3fddc)
#1 0x100598388 in lrealloc alloc.c:1376
#2 0x1005982c4 in xrealloc alloc.c:790
#3 0x10054a490 in shrink_regexp_cache search.c:150
- bug#56108: 29.0.50; ASAN use-after-free in re_match_2_internal,
Gerd Möllmann <=
- bug#56108: 29.0.50; ASAN use-after-free in re_match_2_internal, Eli Zaretskii, 2022/06/20
- bug#56108: 29.0.50; ASAN use-after-free in re_match_2_internal, Gerd Möllmann, 2022/06/22
- bug#56108: 29.0.50; ASAN use-after-free in re_match_2_internal, Eli Zaretskii, 2022/06/22
- bug#56108: 29.0.50; ASAN use-after-free in re_match_2_internal, Gerd Möllmann, 2022/06/22
- bug#56108: 29.0.50; ASAN use-after-free in re_match_2_internal, Eli Zaretskii, 2022/06/22
- bug#56108: 29.0.50; ASAN use-after-free in re_match_2_internal, Gerd Möllmann, 2022/06/22
- bug#56108: 29.0.50; ASAN use-after-free in re_match_2_internal, Eli Zaretskii, 2022/06/22
- bug#56108: 29.0.50; ASAN use-after-free in re_match_2_internal, Gerd Möllmann, 2022/06/23
- bug#56108: 29.0.50; ASAN use-after-free in re_match_2_internal, Eli Zaretskii, 2022/06/23
- bug#56108: 29.0.50; ASAN use-after-free in re_match_2_internal, Eli Zaretskii, 2022/06/23