On Tue, Dec 11, 2018 at 06:24:23PM +0100, Jan Kara wrote: > Readers of /proc/mounts (and similar files) are currently unprotected > from concurrently running remount on the filesystem they are reporting. > This can not only result in bogus reported information but also in > confusion in filesystems ->show_options callbacks resulting in > use-after-free issues or similar (for example ext4 handling of quota > file names is prone to such races). > > Fix the problem by protecting showing of mount information with > sb->s_umount semaphore. Umm... Which tree is it against and what exactly does your hold_sb() do?
