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The library exports all its non-static symbols, making ABI tracking ineffective, and risking conflicts with matching name in user projects.
Thus, please hide them, either by changing default visibility, or via a linker map.
Consider the following code:
vdm_memcpy_future f;
std::thread t1([&]{
f = vdm_memcpy(...): // with threads_mover
});
t1.join();
std::thread t2([&]{
auto f2 = vdm_memcpy(...); // with threads_mover
while (future_poll(&f, NULL) != FUTURE_STATE_COMPLETE);
});
t2.join();
It will most likely segfault because of use-after free in membuf. Inside t1
data_mover_threads_data
is allocated from membuf, in thread-local buffer. When t1
finishes, it will mark the buffer as unused.
Then, inside t2
that same thread-local buffer is reused by f2
. future_poll(&f, NULL)
will then enqueue data allocated by t1
to the ringbuff and the background thread will process that data (now, already overwritten) leading to a use-after-free.
This problem might also occur for data_mover_sync.c
but I did not test that.
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