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| author | Hannes Domani <ssbssa@yahoo.de> | 2024-05-04 18:55:20 +0200 |
|---|---|---|
| committer | Hannes Domani <ssbssa@yahoo.de> | 2024-05-04 18:55:20 +0200 |
| commit | 5140d8e013b0d8ab560b1bb8c72e0a8b2e96ac4b (patch) | |
| tree | 71af7860db5a7961ab768df1e49d90bf2f9b5b16 | |
| parent | b42d685452f7b797dd87ff2856e1959a975e902a (diff) | |
| download | gdb-5140d8e013b0d8ab560b1bb8c72e0a8b2e96ac4b.zip gdb-5140d8e013b0d8ab560b1bb8c72e0a8b2e96ac4b.tar.gz gdb-5140d8e013b0d8ab560b1bb8c72e0a8b2e96ac4b.tar.bz2 | |
Fix heap-use-after-free in index-cached with --disable-threading
If threads are disabled, either by --disable-threading explicitely, or by
missing std::thread support, you get the following ASAN error when
loading symbols:
==7310==ERROR: AddressSanitizer: heap-use-after-free on address 0x614000002128 at pc 0x00000098794a bp 0x7ffe37e6af70 sp 0x7ffe37e6af68
READ of size 1 at 0x614000002128 thread T0
#0 0x987949 in index_cache_store_context::store() const ../../gdb/dwarf2/index-cache.c:163
#1 0x943467 in cooked_index_worker::write_to_cache(cooked_index const*, deferred_warnings*) const ../../gdb/dwarf2/cooked-index.c:601
#2 0x1705e39 in std::function<void ()>::operator()() const /gcc/9/include/c++/9.2.0/bits/std_function.h:690
#3 0x1705e39 in gdb::task_group::impl::~impl() ../../gdbsupport/task-group.cc:38
0x614000002128 is located 232 bytes inside of 408-byte region [0x614000002040,0x6140000021d8)
freed by thread T0 here:
#0 0x7fd75ccf8ea5 in operator delete(void*, unsigned long) ../../.././libsanitizer/asan/asan_new_delete.cc:177
#1 0x9462e5 in cooked_index::index_for_writing() ../../gdb/dwarf2/cooked-index.h:689
#2 0x9462e5 in operator() ../../gdb/dwarf2/cooked-index.c:657
#3 0x9462e5 in _M_invoke /gcc/9/include/c++/9.2.0/bits/std_function.h:300
It's happening because cooked_index_worker::wait always returns true in
this case, which tells cooked_index::wait it can delete the m_state
cooked_index_worker member, but cooked_index_worker::write_to_cache tries
to access it immediately afterwards.
Fixed by making cooked_index_worker::wait only return true if desired_state
is CACHE_DONE, same as if threading was enabled, so m_state will not be
prematurely deleted.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31694
Approved-By: Tom Tromey <tom@tromey.com>
| -rw-r--r-- | gdb/dwarf2/cooked-index.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/gdb/dwarf2/cooked-index.c b/gdb/dwarf2/cooked-index.c index 3b95c07..767f119 100644 --- a/gdb/dwarf2/cooked-index.c +++ b/gdb/dwarf2/cooked-index.c @@ -513,7 +513,7 @@ cooked_index_worker::wait (cooked_state desired_state, bool allow_quit) #else /* Without threads, all the work is done immediately on the main thread, and there is never anything to wait for. */ - done = true; + done = desired_state == cooked_state::CACHE_DONE; #endif /* CXX_STD_THREAD */ /* Only the main thread is allowed to report complaints and the |