Jan Kara 35ceae4474 fsnotify: Avoid data race between fsnotify_recalc_mask() and fsnotify_object_watched() ... When __fsnotify_recalc_mask() recomputes the mask on the watched object, the compiler can "optimize" the code to perform partial updates to the mask (including zeroing it at the beginning). Thus places checking the object mask without conn->lock such as fsnotify_object_watched() could see invalid states of the mask. Make sure the mask update is performed by one memory store using WRITE_ONCE(). Reported-by: syzbot+701037856c25b143f1ad@syzkaller.appspotmail.com Reported-by: Dmitry Vyukov <dvyukov@google.com> Link: https://lore.kernel.org/all/CACT4Y+Zk0ohwwwHSD63U2-PQ=UuamXczr1mKBD6xtj2dyYKBvA@mail.gmail.com Signed-off-by: Jan Kara <jack@suse.cz> Reviewed-by: Josef Bacik <josef@toxicpanda.com> Link: https://patch.msgid.link/20240717140623.27768-1-jack@suse.cz		2024-10-02 15:11:40 +02:00
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inotify_fsnotify.c	inotify: Avoid reporting event with invalid wd	2023-04-25 12:36:55 +02:00
inotify_user.c	fsnotify: Avoid data race between fsnotify_recalc_mask() and fsnotify_object_watched()	2024-10-02 15:11:40 +02:00
inotify.h	inotify: move control flags from mask to mark flags	2022-04-25 14:37:06 +02:00
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