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* bug#56108: 29.0.50; ASAN use-after-free in re_match_2_internal
@ 2022-06-20 14:07 Gerd Möllmann
  2022-06-20 19:09 ` Eli Zaretskii
  0 siblings, 1 reply; 22+ messages in thread
From: Gerd Möllmann @ 2022-06-20 14:07 UTC (permalink / raw)
  To: 56108

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






^ permalink raw reply	[flat|nested] 22+ messages in thread

end of thread, other threads:[~2022-06-27 13:29 UTC | newest]

Thread overview: 22+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2022-06-20 14:07 bug#56108: 29.0.50; ASAN use-after-free in re_match_2_internal Gerd Möllmann
2022-06-20 19:09 ` Eli Zaretskii
2022-06-22  8:13   ` Gerd Möllmann
2022-06-22 13:38     ` Eli Zaretskii
2022-06-22 14:10       ` Gerd Möllmann
2022-06-22 14:24         ` Eli Zaretskii
2022-06-22 15:11           ` Gerd Möllmann
2022-06-22 16:19             ` Eli Zaretskii
2022-06-23  5:53               ` Gerd Möllmann
2022-06-23  6:57                 ` Eli Zaretskii
2022-06-23  7:17                   ` Eli Zaretskii
2022-06-23 21:29                     ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-06-24  5:55                       ` Eli Zaretskii
2022-06-24  6:01                         ` Gerd Möllmann
2022-06-24  9:35                           ` Gerd Möllmann
2022-06-24 15:40                             ` Eli Zaretskii
2022-06-25  9:18                               ` Eli Zaretskii
2022-06-27 13:26                             ` Eli Zaretskii
2022-06-27 13:29                               ` Gerd Möllmann
2022-06-23  8:24                   ` Gerd Möllmann
2022-06-23  8:37                     ` Eli Zaretskii
2022-06-23  8:49                       ` Gerd Möllmann

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