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signal: don't allow sending any signals to PF_IO_WORKER threads

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They don't take signals individually, and even if they share signals with
the parent task, don't allow them to be delivered through the worker
thread. Linux does allow this kind of behavior for regular threads, but
it's really a compatability thing that we need not care about for the IO
threads.

Reported-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2021-03-19 19:25:13 -06:00
parent de75a3d3f5
commit 5be28c8f85
1 changed files with 3 additions and 0 deletions
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3
kernel/signal.c
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@ -833,6 +833,9 @@ static int check_kill_permission(int sig, struct kernel_siginfo *info,
if (!valid_signal(sig))
return -EINVAL;
/* PF_IO_WORKER threads don't take any signals */
if (t->flags & PF_IO_WORKER)
return -ESRCH;
if (!si_fromuser(info))
return 0;