fanotify: Disallow permission events for proc filesystem

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Proc filesystem has special locking rules for various files. Thus
fanotify which opens files on event delivery can easily deadlock
against another process that waits for fanotify permission event to be
handled. Since permission events on /proc have doubtful value anyway,
just disallow them.

Link: https://lore.kernel.org/linux-fsdevel/20190320131642.GE9485@quack2.suse.cz/
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>

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This commit is contained in:

Jan Kara 2019-05-15 16:28:34 +02:00

parent cd6c84d8f0

commit 0b3b094ac9

3 changed files with 24 additions and 1 deletions

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22

fs/notify/fanotify/fanotify_user.c

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2

fs/proc/root.c

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1

include/linux/fs.h

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