audit: fix info leak in AUDIT_GET requests

commit 64fbff9ae0a0a843365d922e0057fc785f23f0e3 upstream.

We leak 4 bytes of kernel stack in response to an AUDIT_GET request as
we miss to initialize the mask member of status_set. Fix that.

Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Eric Paris <eparis@redhat.com>
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Eric Paris <eparis@redhat.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/kernel/audit.c b/kernel/audit.c
index 5e74854..7cde653 100644 (file)
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -684,6 +684,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 
        switch (msg_type) {
        case AUDIT_GET:
+               status_set.mask          = 0;
                status_set.enabled       = audit_enabled;
                status_set.failure       = audit_failure;
                status_set.pid           = audit_pid;