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ovl: disallow overlayfs as upperdir

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commit 76bc8e2843b66f8205026365966b49ec6da39ae7 upstream.

This does not work and does not make sense.  So instead of fixing it
(probably not hard) just disallow.

Reported-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Miklos Szeredi 2016-07-29 12:05:24 +02:00 committed by Greg Kroah-Hartman
parent 7a2cfda740
commit 54c4ddcbab
1 changed files with 2 additions and 1 deletions
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3
fs/overlayfs/super.c
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@ -376,7 +376,8 @@ static struct ovl_entry *ovl_alloc_entry(unsigned int numlower)
static bool ovl_dentry_remote(struct dentry *dentry)
{
return dentry->d_flags &
(DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE);
(DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE |
DCACHE_OP_REAL);
}
static bool ovl_dentry_weird(struct dentry *dentry)