path: root/fs/splice.c
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authorMiklos Szeredi <mszeredi@redhat.com>2016-05-11 01:16:37 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2016-05-10 23:58:18 -0400
commit38b78a5f18584db6fa7441e0f4531b283b0e6725 (patch)
treecdb15adf5fe5c201c87d17c7847cf07484d8a441 /fs/splice.c
parentvfs: add lookup_hash() helper (diff)
ovl: ignore permissions on underlying lookup
Generally permission checking is not necessary when overlayfs looks up a dentry on one of the underlying layers, since search permission on base directory was already checked in ovl_permission(). More specifically using lookup_one_len() causes a problem when the lower directory lacks search permission for a specific user while the upper directory does have search permission. Since lookups are cached, this causes inconsistency in behavior: success depends on who did the first lookup. So instead use lookup_hash() which doesn't do the permission check. Reported-by: Ignacy Gawędzki <ignacy.gawedzki@green-communications.fr> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
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