[patch added to 3.12-stable] apparmor: fix disconnected bind mnts reconnection

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From: John Johansen <john.johansen@xxxxxxxxxxxxx>

This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.

===============

commit f2e561d190da7ff5ee265fa460e2d7f753dddfda upstream.

Bind mounts can fail to be properly reconnected when PATH_CONNECT is
specified. Ensure that when PATH_CONNECT is specified the path has
a root.

BugLink: http://bugs.launchpad.net/bugs/1319984

Signed-off-by: John Johansen <john.johansen@xxxxxxxxxxxxx>
Acked-by: Seth Arnold <seth.arnold@xxxxxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
 security/apparmor/path.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/security/apparmor/path.c b/security/apparmor/path.c
index 35b394a75d76..0f232e5cd18c 100644
--- a/security/apparmor/path.c
+++ b/security/apparmor/path.c
@@ -141,7 +141,10 @@ static int d_namespace_path(struct path *path, char *buf, int buflen,
 			error = -EACCES;
 			if (*res == '/')
 				*name = res + 1;
-		}
+		} else if (*res != '/')
+			/* CONNECT_PATH with missing root */
+			error = prepend(name, *name - buf, "/", 1);
+
 	}
 
 out:
-- 
2.11.0

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