I realize my e-mail could seem a little bit rude.
I apologize if it's the case.
I'm just very surprised someone is still using LinuxThreads.
On 25/05/2021 14:59, Yann Sionneau wrote:
Hello,
Honestly, I would not recommend anyone to use LinuxThreads today.
It is the "old" way of doing threads in Linux.
Everyone (to my knowledge) is using NPTL now.
Is there a really good reason for you to use LinuxThreads?
Yann
On 25/05/2021 14:49, Vladimir Murzin wrote:
Hi
I got report about race condition in LinuxThread's sigaction wrapper
located in libpthread/linuxthreads/signals.c
In sigaction wrapper
A.1) override handler for new action to point at pthread_sighandler
A.2) __libc_sigaction
A.3) update global array (sighandler) used by pthread_sighandler with
real action (from new)
pthread_sighandler
B.1) find real action (indexed by signal number)
B.2) unconditionally execute action
IIUC, if we receive signal in a window between A.2 and A.3 we are
missing executing real action (likely we try to execute NULL).
Does that make sense?
Cheers
Vladimir
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