fs: refuse fspick() on internal superblocks

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There's a few instances where a internal superblock is reachable by
fspick(). Block that. graft_tree() and fsmount() already refuse them.
fanotify refuses mount and superblock marks on them for the same reason.

Fixes: cf3cba4a42 ("vfs: syscall: Add fspick() to select a superblock for reconfiguration")
Cc: stable@vger.kernel.org # v5.2+
Link: https://patch.msgid.link/20260926-work-mount-fixes-2-v1-6-f357abf3d17b@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

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Christian Brauner 2026-09-26 15:44:29 +02:00

parent 08f4288a37

commit 02587a4af8

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fs/fsopen.c

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