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UPSTREAM: kernel: allow fork with TIF_NOTIFY_SIGNAL pending

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[ Upstream commit 66ae0d1e2d9fe6ec70e73fcfdcf4b390e271c1ac ]

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().

Change-Id: Iec007746b42f5d62581a8b5f6cca4006e707b8e3
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 0f735cf52b)
Bug: 268174392
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Jens Axboe
2021-03-22 09:39:12 -06:00
committed by Greg Kroah-Hartman
parent b25b8c55ba
commit 6e4362caf9
1 changed files with 1 additions and 1 deletions
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2
kernel/fork.c
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@@ -1988,7 +1988,7 @@ 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;