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autofs: clear O_NONBLOCK on the pipe

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autofs does not expect the pipe it is given to have O_NONBLOCK set -
specifically if __kernel_write() in autofs_write() returns -EAGAIN, this
is treated as a fatal error and the pipe is closed.

For safety autofs should, therefore, clear the O_NONBLOCK flag.

Releases of systemd prior to 8th February 2019 used
  pipe2(p, O_NONBLOCK|O_CLOEXEC)
and thus (inadvertently) set this flag.

Link: http://lkml.kernel.org/r/154993550902.3321.1183632970046073478.stgit@pluto-themaw-net
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
NeilBrown 2019-03-07 16:29:16 -08:00 committed by Linus Torvalds
parent 874d22d62b
commit 660c9fc72e
1 changed files with 2 additions and 0 deletions
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2
fs/autofs/autofs_i.h
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@ -216,6 +216,8 @@ static inline int autofs_prepare_pipe(struct file *pipe)
return -EINVAL;
/* We want a packet pipe */
pipe->f_flags |= O_DIRECT;
/* We don't expect -EAGAIN */
pipe->f_flags &= ~O_NONBLOCK;
return 0;
}