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authorRich Felker <dalias@aerifal.cx>2011-06-14 01:35:51 -0400
committerRich Felker <dalias@aerifal.cx>2011-06-14 01:35:51 -0400
commit7779dbd2663269b465951189b4f43e70839bc073 (patch)
treefa131e2ddcf164bf4d58a07f627a4704a0b13f73 /src/signal/x86_64
parentf58c8a0f391987a65e055ae591ec59b9df7b7f7c (diff)
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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/signal/x86_64')
0 files changed, 0 insertions, 0 deletions