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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: |
Wed, 05 Oct 2022 16:13:01 +0300 |
> From: Gerd Möllmann <gerd.moellmann@gmail.com>
> Cc: Po Lu <luangruo@yahoo.com>, Alan Third <alan@idiocy.org>,
> 58042@debbugs.gnu.org
> Date: Wed, 05 Oct 2022 12:45:04 +0200
>
> And an update to the second ASAN error that I could actually reproduce
> by starting Emacs on my branch:
>
> ==64010==ERROR: AddressSanitizer: heap-use-after-free on address
> 0x000107130d00 at pc 0x0001002a48d8 bp 0x00016fdcaa80 sp 0x00016fdcaa78
> READ of size 8 at 0x000107130d00 thread T0
> #0 0x1002a48d4 in PSEUDOVECTORP lisp.h:1110
> #1 0x1002a4944 in SYMBOL_WITH_POS_P lisp.h:1122
> #2 0x10025a3f4 in EQ lisp.h:1342
> #3 0x100280f6c in run_window_change_functions window.c:3964
> #4 0x1000f1980 in redisplay_internal xdisp.c:16600
> #5 0x100107cb4 in redisplay xdisp.c:16111
> #6 0x10089364c in -[EmacsView layoutSublayersOfLayer:] nsterm.m:8661
> #7 0x1900a9624 in CA::Layer::layout_if_needed(CA::Transaction*)+0x224
> (QuartzCore:arm64e+0x20624)
> #8 0x1901f661c in CA::Context::commit_transaction(CA::Transaction*,
> double, double*)+0x1c0 (QuartzCore:arm64e+0x16d61c)
> #9 0x19008b4c8 in CA::Transaction::commit()+0x2bc
> (QuartzCore:arm64e+0x24c8)
> #10 0x18bee1698 in __62+[CATransaction(NSCATransaction)
> NS_setFlushesWithDisplayLink]_block_invoke+0x12c (AppKit:arm64e+0x1ac698)
> #11 0x18c646754 in
> ___NSRunLoopObserverCreateWithHandler_block_invoke+0x3c
> (AppKit:arm64e+0x911754)
> #12 0x1892101a0 in
> __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__+0x20
> (CoreFoundation:arm64e+0x841a0)
> #13 0x18920fff0 in __CFRunLoopDoObservers+0x24c
> (CoreFoundation:arm64e+0x83ff0)
> #14 0x18920f524 in __CFRunLoopRun+0x300 (CoreFoundation:arm64e+0x83524)
> #15 0x18920ea80 in CFRunLoopRunSpecific+0x254
> (CoreFoundation:arm64e+0x82a80)
> #16 0x191e4e334 in RunCurrentEventLoopInMode+0x120
> (HIToolbox:arm64e+0x32334)
> #17 0x191e4dfc0 in ReceiveNextEventCommon+0x140 (HIToolbox:arm64e+0x31fc0)
> #18 0x191e4de64 in _BlockUntilNextEventMatchingListInModeWithFilter+0x44
> (HIToolbox:arm64e+0x31e64)
> #19 0x18bd76518 in _DPSNextEvent+0x358 (AppKit:arm64e+0x41518)
> #20 0x18bd74e10 in -[NSApplication(NSEvent)
> _nextEventMatchingEventMask:untilDate:inMode:dequeue:]+0x52c
> (AppKit:arm64e+0x3fe10)
> #21 0x18bd66fdc in -[NSApplication run]+0x250 (AppKit:arm64e+0x31fdc)
> #22 0x100870bb0 in -[EmacsApp run] nsterm.m:5799
> #23 0x1008c7b0c in ns_read_socket_1 nsterm.m:4679
> #24 0x1008ae530 in ns_read_socket nsterm.m:4697
> #25 0x100437168 in gobble_input keyboard.c:7379
> #26 0x1004389d0 in handle_async_input keyboard.c:7610
> #27 0x1004389b0 in process_pending_signals keyboard.c:7624
> #28 0x100438acc in unblock_input_to keyboard.c:7639
> #29 0x100432cac in unblock_input keyboard.c:7658
> #30 0x1005ba024 in garbage_collect alloc.c:6256
> #31 0x1005b950c in maybe_garbage_collect alloc.c:6090
> #32 0x10064f6a8 in maybe_gc lisp.h:5622
> #33 0x10063fcfc in eval_sub eval.c:2388
> #34 0x100640838 in eval_sub eval.c:2449
> #35 0x10064234c in Fprogn eval.c:436
> #36 0x100654eb8 in funcall_lambda eval.c:3218
> #37 0x1006532c4 in funcall_general eval.c:2941
> #38 0x100647fcc in Ffuncall eval.c:2979
> #39 0x100651ca8 in Fapply eval.c:2650
> #40 0x10063ead8 in apply1 eval.c:2866
> #41 0x1006484bc in Fmacroexpand eval.c:1149
> #42 0x10065394c in funcall_subr eval.c:3019
> #43 0x10072e004 in exec_byte_code bytecode.c:809
> #44 0x10065c16c in fetch_and_exec_byte_code eval.c:3066
> #45 0x100654994 in funcall_lambda eval.c:3138
> #46 0x10065316c in funcall_general eval.c:2929
> #47 0x100647fcc in Ffuncall eval.c:2979
> #48 0x1006fcd80 in call2 lisp.h:3302
> #49 0x1006f4ecc in readevalloop_eager_expand_eval lread.c:2151
> #50 0x1006e0b0c in readevalloop lread.c:2343
> #51 0x1006e236c in Feval_buffer lread.c:2416
> #52 0x100653d24 in funcall_subr eval.c:3025
> #53 0x10072e004 in exec_byte_code bytecode.c:809
> #54 0x10065c16c in fetch_and_exec_byte_code eval.c:3066
> #55 0x100654994 in funcall_lambda eval.c:3138
> #56 0x10065316c in funcall_general eval.c:2929
> #57 0x100647fcc in Ffuncall eval.c:2979
> #58 0x1006ddfe8 in call4 lisp.h:3317
> #59 0x1006d9058 in Fload lread.c:1483
> #60 0x1006e1158 in save_match_data_load lread.c:1636
> #61 0x10064e9c8 in load_with_autoload_queue eval.c:2271
> #62 0x10067cb40 in Frequire fns.c:3308
> #63 0x100653a54 in funcall_subr eval.c:3021
> #64 0x10072e004 in exec_byte_code bytecode.c:809
> #65 0x10065c16c in fetch_and_exec_byte_code eval.c:3066
> #66 0x100654994 in funcall_lambda eval.c:3138
> #67 0x10065316c in funcall_general eval.c:2929
> #68 0x100647fcc in Ffuncall eval.c:2979
> #69 0x100651ca8 in Fapply eval.c:2650
> #70 0x100654414 in funcall_subr eval.c:3044
> #71 0x10072e004 in exec_byte_code bytecode.c:809
> #72 0x10065c16c in fetch_and_exec_byte_code eval.c:3066
> #73 0x100654994 in funcall_lambda eval.c:3138
> #74 0x100650834 in apply_lambda eval.c:3088
> #75 0x100641734 in eval_sub eval.c:2529
> #76 0x1006f5394 in readevalloop_eager_expand_eval lread.c:2160
> #77 0x1006e0b0c in readevalloop lread.c:2343
> #78 0x1006e236c in Feval_buffer lread.c:2416
> #79 0x100653d24 in funcall_subr eval.c:3025
> #80 0x10072e004 in exec_byte_code bytecode.c:809
> #81 0x10065c16c in fetch_and_exec_byte_code eval.c:3066
> #82 0x100654994 in funcall_lambda eval.c:3138
> #83 0x10065316c in funcall_general eval.c:2929
> #84 0x100647fcc in Ffuncall eval.c:2979
> #85 0x1006ddfe8 in call4 lisp.h:3317
> #86 0x1006d9058 in Fload lread.c:1483
> #87 0x1006410e8 in eval_sub eval.c:2496
> #88 0x10064234c in Fprogn eval.c:436
> #89 0x100646c90 in Flet eval.c:1023
> #90 0x1006403e0 in eval_sub eval.c:2435
> #91 0x10064234c in Fprogn eval.c:436
> #92 0x100654eb8 in funcall_lambda eval.c:3218
> #93 0x100650834 in apply_lambda eval.c:3088
> #94 0x100641c68 in eval_sub eval.c:2572
> #95 0x1006f5394 in readevalloop_eager_expand_eval lread.c:2160
> #96 0x1006e0b0c in readevalloop lread.c:2343
> #97 0x1006e236c in Feval_buffer lread.c:2416
> #98 0x100653d24 in funcall_subr eval.c:3025
> #99 0x10072e004 in exec_byte_code bytecode.c:809
> #100 0x10065c16c in fetch_and_exec_byte_code eval.c:3066
> #101 0x100654994 in funcall_lambda eval.c:3138
> #102 0x10065316c in funcall_general eval.c:2929
> #103 0x100647fcc in Ffuncall eval.c:2979
> #104 0x1006ddfe8 in call4 lisp.h:3317
> #105 0x1006d9058 in Fload lread.c:1483
> #106 0x100653d24 in funcall_subr eval.c:3025
> #107 0x10072e004 in exec_byte_code bytecode.c:809
> #108 0x10065c16c in fetch_and_exec_byte_code eval.c:3066
> #109 0x100654994 in funcall_lambda eval.c:3138
> #110 0x100650834 in apply_lambda eval.c:3088
> #111 0x100641734 in eval_sub eval.c:2529
> #112 0x10064efb0 in Feval eval.c:2345
> #113 0x100451650 in top_level_2 keyboard.c:1141
> #114 0x10064a318 in internal_condition_case eval.c:1471
> #115 0x100451564 in top_level_1 keyboard.c:1149
> #116 0x100648aa4 in internal_catch eval.c:1194
> #117 0x100416f04 in command_loop keyboard.c:1109
> #118 0x100416994 in recursive_edit_1 keyboard.c:719
> #119 0x100417950 in Frecursive_edit keyboard.c:802
> #120 0x10040fb00 in main emacs.c:2515
> #121 0x101549088 in start+0x204 (dyld:arm64e+0x5088)
>
> That is redisplay during garbage_collect!
>
> The change to probably_quit didn't help. Commenting out the call to
> redisplay in the layout stuff did.
I don't think I understand what this diagnostics says. The backtrace
tells us that Emacs performed GC, then called unblock_input, which
called gobble_input, which on NS triggers redisplay. So far I see no
problem; do you?
Then redisplay called run_window_change_functions, which attempted to
compare some window with old_selected_window, and one of these two
(which one?) was found to be in freed heap memory? Why? because one
of these two windows is not a live window anymore? So we should
sprinkle more WINDOW_LIVE_P tests in that loop in
run_window_change_functions?
This has nothing per se to do with GC and with redisplay being run
from the unblock_input, this can happen regardless of these.
- bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal, (continued)
- bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal, Po Lu, 2022/10/05
- bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal, Gerd Möllmann, 2022/10/05
- bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal, Gerd Möllmann, 2022/10/05
- bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal, Po Lu, 2022/10/05
- bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal, Po Lu, 2022/10/05
- bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal, Gerd Möllmann, 2022/10/06
- bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal, Eli Zaretskii, 2022/10/05
- 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, 2022/10/05
- bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal, Eli Zaretskii, 2022/10/05
bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal, Gerd Möllmann, 2022/10/06