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Commit 2cb33cac authored by Tyler Hicks's avatar Tyler Hicks Committed by Sage Weil
Browse files

libceph: Fix NULL pointer dereference in auth client code 



A malicious monitor can craft an auth reply message that could cause a
NULL function pointer dereference in the client's kernel.

To prevent this, the auth_none protocol handler needs an empty
ceph_auth_client_ops->build_request() function.

CVE-2013-1059

Signed-off-by: default avatarTyler Hicks <tyhicks@canonical.com>
Reported-by: default avatarChanam Park <chanam.park@hkpco.kr>
Reviewed-by: default avatarSeth Arnold <seth.arnold@canonical.com>
Reviewed-by: default avatarSage Weil <sage@inktank.com>
Cc: stable@vger.kernel.org
parent 93faca6e

net/ceph/auth_none.c

+6 −0
Original line number Diff line number Diff line
@@ -39,6 +39,11 @@ static int should_authenticate(struct ceph_auth_client *ac) 
	return xi->starting;

}



static int build_request(struct ceph_auth_client *ac, void *buf, void *end)

{

	return 0;

}



/*

 * the generic auth code decode the global_id, and we carry no actual

 * authenticate state, so nothing happens here.
@@ -106,6 +111,7 @@ static const struct ceph_auth_client_ops ceph_auth_none_ops = { 
	.destroy = destroy,

	.is_authenticated = is_authenticated,

	.should_authenticate = should_authenticate,

	.build_request = build_request,

	.handle_reply = handle_reply,

	.create_authorizer = ceph_auth_none_create_authorizer,

	.destroy_authorizer = ceph_auth_none_destroy_authorizer,