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bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal
From: |
Eli Zaretskii |
Subject: |
bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal |
Date: |
Sat, 24 Sep 2022 17:56:55 +0300 |
> From: Gerd Möllmann <gerd.moellmann@gmail.com>
> Date: Sat, 24 Sep 2022 16:17:20 +0200
>
> Gerd Möllmann <gerd.moellmann@gmail.com> writes:
>
> > ==79227==ERROR: AddressSanitizer: heap-use-after-free on address
> > 0x00011f81e7d1 at pc 0x0001005825c4 bp 0x00016fdcf370 sp 0x00016fdcf368
> > READ of size 1 at 0x00011f81e7d1 thread T0
> > #0 0x1005825c0 in re_match_2_internal regex-emacs.c:4352
> > #1 0x10057e5cc in rpl_re_search_2 regex-emacs.c:3383
> > #2 0x10057d1c4 in rpl_re_search regex-emacs.c:3177
> > #3 0x10056115c in fast_string_match_internal search.c:492
> > #4 0x1005045c0 in fast_string_match lisp.h:4818
> > #5 0x100504018 in Ffind_file_name_handler fileio.c:324
> > #6 0x1006dbe5c in openp lread.c:1911
> > #7 0x1006d8844 in Fload lread.c:1302
> > #8 0x1006e1af0 in save_match_data_load lread.c:1630
> > #9 0x10064f8cc in load_with_autoload_queue eval.c:2269
> > #10 0x10067d2f8 in Frequire fns.c:3274
>
> Forget to copy the part where it is freed:
>
> freed by thread T0 here:
> #0 0x103332de4 in wrap_free+0x98
> (libclang_rt.asan_osx_dynamic.dylib:arm64e+0x3ede4)
> #1 0x100985e38 in rpl_free free.c:48
> #2 0x1005b71a4 in lisp_free alloc.c:1038
> #3 0x1005cbda4 in compact_small_strings alloc.c:2191
> #4 0x1005c9f24 in sweep_strings alloc.c:2072
> #5 0x1005bd028 in gc_sweep alloc.c:7397
> #6 0x1005bb178 in garbage_collect alloc.c:6245
> #7 0x1005ba694 in maybe_garbage_collect alloc.c:6090
> #8 0x1006505ac in maybe_gc lisp.h:5624
> #9 0x100648ffc in Ffuncall eval.c:2972
> #10 0x10064bcd0 in internal_condition_case_n eval.c:1555
> #11 0x1000cdc8c in safe__call xdisp.c:3026
> #12 0x1000cdfc4 in safe__call1 xdisp.c:3062
> #13 0x1001d6404 in prepare_menu_bars xdisp.c:13572
> #14 0x1000f2340 in redisplay_internal xdisp.c:16523
> #15 0x100108f34 in redisplay xdisp.c:16105
> #16 0x10088fa84 in -[EmacsView layoutSublayersOfLayer:] nsterm.m:8662
> #17 0x1900a9624 in CA::Layer::layout_if_needed(CA::Transaction*)+0x224
> (QuartzCore:arm64e+0x20624)
> #18 0x1901f661c in CA::Context::commit_transaction(CA::Transaction*,
> double, double*)+0x1c0 (QuartzCore:arm64e+0x16d61c)
> #19 0x19008b4c8 in CA::Transaction::commit()+0x2bc
> (QuartzCore:arm64e+0x24c8)
> #20 0x18bee1698 in __62+[CATransaction(NSCATransaction)
> NS_setFlushesWithDisplayLink]_block_invoke+0x12c (AppKit:arm64e+0x1ac698)
> #21 0x18c646754 in
> ___NSRunLoopObserverCreateWithHandler_block_invoke+0x3c
> (AppKit:arm64e+0x911754)
> #22 0x1892101a0 in
> __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__+0x20
> (CoreFoundation:arm64e+0x841a0)
> #23 0x18920fff0 in __CFRunLoopDoObservers+0x24c
> (CoreFoundation:arm64e+0x83ff0)
> #24 0x18920f524 in __CFRunLoopRun+0x300 (CoreFoundation:arm64e+0x83524)
> #25 0x18920ea80 in CFRunLoopRunSpecific+0x254
> (CoreFoundation:arm64e+0x82a80)
> #26 0x191e4e334 in RunCurrentEventLoopInMode+0x120
> (HIToolbox:arm64e+0x32334)
> #27 0x191e4dfc0 in ReceiveNextEventCommon+0x140 (HIToolbox:arm64e+0x31fc0)
> #28 0x191e4de64 in _BlockUntilNextEventMatchingListInModeWithFilter+0x44
> (HIToolbox:arm64e+0x31e64)
> #29 0x18bd76518 in _DPSNextEvent+0x358 (AppKit:arm64e+0x41518)
So it was freed by GC, which probably relocated string data or
something. But I don't understand the relation between these two
backtraces: was the one that accessed a freed string called by the one
which triggered GC? IOW, what is the relation between the call to
'require', which ended up calling re_match_2_internal, and the call to
prepare_menu_bars, which triggered GC?
re_search gets Lisp strings as its arguments, so unless GC was called
while the regexp search was in progress, I cannot understand how this
could happen.
Is there any way to know which argument of re_match_2_internal was
used to access the free'd heap?
- bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal, Gerd Möllmann, 2022/09/24
- bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal, Gerd Möllmann, 2022/09/24
- bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal, Gerd Möllmann, 2022/09/24
- bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal,
Eli Zaretskii <=
- bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal, Gerd Möllmann, 2022/09/24
- bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal, Eli Zaretskii, 2022/09/24
- bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal, Gerd Möllmann, 2022/09/25
- bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal, Eli Zaretskii, 2022/09/25
- bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal, Gerd Möllmann, 2022/09/25
- bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal, Eli Zaretskii, 2022/09/25
- bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal, Gerd Möllmann, 2022/09/25
- bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal, Eli Zaretskii, 2022/09/25
- bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal, Gerd Möllmann, 2022/09/26