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Subject[WTF] ... is going on with current->fs->{root,mnt} accesses in pohmelfs
a) pohmelfs_construct_path_string() will do interesting things if you
call it while chrooted into jail and pohmelfs mounted deeper in that
jail. Try it.

b) just why do we care about root of chroot jail in pohmelfs_path_length()?
Not to mention anything else, current->fs->root/mnt may be changed under
you if you share current->fs with another thread, but even aside of that,
why does filesystem care about chroot of caller at all?

What's going on there?

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