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Jann Horn
9c954499d4
The operations FUSE_NOTIFY_STORE and FUSE_NOTIFY_RETRIEVE allow the
FUSE daemon to actively write/read pagecache contents.
For directories with FOPEN_CACHE_DIR, the pagecache is used as
kernel-internal cache storage, and userspace is not supposed to have
direct access to this cache - in particular, fuse_parse_cache() will hit
WARN_ON() if the cache contains bogus data.
Reject FUSE_NOTIFY_STORE and FUSE_NOTIFY_RETRIEVE on anything other than
regular files with -EINVAL.
Fixes: 5d7bc7e868 ("fuse: allow using readdir cache")
Cc: [email protected]
Signed-off-by: Jann Horn <[email protected]>
Link: https://patch.msgid.link/[email protected]
Acked-by: Miklos Szeredi <[email protected]>
Signed-off-by: Christian Brauner (Amutable) <[email protected]>