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Message-ID: <20120221180216.25235.27806.stgit@warthog.procyon.org.uk> Date: Tue, 21 Feb 2012 18:02:16 +0000 From: David Howells <dhowells@...hat.com> To: linux-fsdevel@...r.kernel.org, viro@...IV.linux.org.uk, valerie.aurora@...il.com Cc: linux-kernel@...r.kernel.org, David Howells <dhowells@...hat.com> Subject: [PATCH 38/73] union-mount: Prevent bind mounts of union mounts [ver #2] From: Valerie Aurora <vaurora@...hat.com> Prevent bind mounts of parts of union mounts. XXX - Bind mounting parts of union mounts is probably easy to implement, but requires some careful thought about corner cases, extensive testing, and some refactoring of the code. Original-author: Valerie Aurora <vaurora@...hat.com> Signed-off-by: David Howells <dhowells@...hat.com> --- fs/namespace.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-) diff --git a/fs/namespace.c b/fs/namespace.c index 3c950fa..c990f69 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -1845,6 +1845,12 @@ static int do_loopback(struct path *path, char *old_name, if (IS_MNT_UNBINDABLE(old)) goto out2; + /* XXX - Mounting a subtree of a union mount elsewhere requires careful + * thought and some refactoring. + */ + if (IS_MNT_UNION(old_path.mnt)) + goto out2; + if (!check_mnt(real_mount(path->mnt)) || !check_mnt(old)) goto out2; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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