I got the following error with an ASAN-instrument libthr: ==803==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7fffffffcdb0 at pc 0x000801863396 bp 0x7ff8 READ of size 4 at 0x7fffffffcdb0 thread T0 #0 0x801863395 in handle_signal /local/scratch/alr48/cheri/freebsd/lib/libthr/thread/thr_sig.c:262:2 #1 0x801860da2 in thr_sighandler /local/scratch/alr48/cheri/freebsd/lib/libthr/thread/thr_sig.c:246:2 Address 0x7fffffffcdb0 is located in stack of thread T0 at offset 208 in frame #0 0x80186080f in thr_sighandler /local/scratch/alr48/cheri/freebsd/lib/libthr/thread/thr_sig.c:213 This frame has 1 object(s): [32, 64) 'act' (line 216) <== Memory access at offset 208 overflows this variable HINT: this may be a false positive if your program uses some custom stack This seems like a false-positive since the line in question is `SIGSETOR(actp->sa_mask, ucp->uc_sigmask);` and it complains about a read operation (from the ucontext_t argument) so this indicates to me that ASAN does not understand that thr_sighandler() is a signal handler. Differential Revision: https://reviews.freebsd.org/D31074 |
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arch | ||
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tests | ||
thread | ||
libthr.3 | ||
Makefile | ||
Makefile.depend | ||
plockstat.d | ||
pthread.map |