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| author | Jens Axboe <axboe@kernel.dk> | 2021-03-20 02:25:13 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-03-21 16:39:32 +0100 |
| commit | 5be28c8f85ce99ed2d329d2ad8bdd18ea19473a5 (patch) | |
| tree | a0e1f35dc49381c58cfb40e10d32d14aaf5996ed | |
| parent | io_uring: don't leak creds on SQO attach error (diff) | |
| download | linux-5be28c8f85ce99ed2d329d2ad8bdd18ea19473a5.tar.xz linux-5be28c8f85ce99ed2d329d2ad8bdd18ea19473a5.zip | |
signal: don't allow sending any signals to PF_IO_WORKER threads
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>
| -rw-r--r-- | kernel/signal.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/signal.c b/kernel/signal.c index ba4d1ef39a9e..11cabcf20e7a 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -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; |