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author | Rich Felker <dalias@aerifal.cx> | 2011-06-14 01:35:51 -0400 |
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committer | Rich Felker <dalias@aerifal.cx> | 2011-06-14 01:35:51 -0400 |
commit | 7779dbd2663269b465951189b4f43e70839bc073 (patch) | |
tree | fa131e2ddcf164bf4d58a07f627a4704a0b13f73 /src/ctype/islower.c | |
parent | f58c8a0f391987a65e055ae591ec59b9df7b7f7c (diff) | |
download | musl-7779dbd2663269b465951189b4f43e70839bc073.tar.gz musl-7779dbd2663269b465951189b4f43e70839bc073.tar.xz musl-7779dbd2663269b465951189b4f43e70839bc073.zip |
fix race condition in pthread_kill
if thread id was reused by the kernel between the time pthread_kill read it from the userspace pthread_t object and the time of the tgkill syscall, a signal could be sent to the wrong thread. the tgkill syscall was supposed to prevent this race (versus the old tkill syscall) but it can't; it can only help in the case where the tid is reused in a different process, but not when the tid is reused in the same process. the only solution i can see is an extra lock to prevent threads from exiting while another thread is trying to pthread_kill them. it should be very very cheap in the non-contended case.
Diffstat (limited to 'src/ctype/islower.c')
0 files changed, 0 insertions, 0 deletions