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kernel: allow fork with TIF_NOTIFY_SIGNAL pending 

fork() fails if signal_pending() is true, but there are two conditions
that can lead to that:

1) An actual signal is pending. We want fork to fail for that one, like
   we always have.

2) TIF_NOTIFY_SIGNAL is pending, because the task has pending task_work.
   We don't need to make it fail for that case.

Allow fork() to proceed if just task_work is pending, by changing the
signal_pending() check to task_sigpending().

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2021-03-22 09:39:12 -06:00
parent b69de288e9
commit 66ae0d1e2d
1 changed files with 1 additions and 1 deletions
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2
kernel/fork.c
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@ -1941,7 +1941,7 @@ static __latent_entropy struct task_struct *copy_process(
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
retval = -ERESTARTNOINTR;
if (signal_pending(current))
if (task_sigpending(current))
goto fork_out;
retval = -ENOMEM;