Revert "SELinux: use SECINITSID_NETMSG instead of SECINITSID_UNLABELED for NetLabel"
This reverts commit 9faf65fb6ee2b4e08325ba2d69e5ccf0c46453d0.
It bit people like Michal Piotrowski:
"My system is too secure, I can not login :)"
because it changed how CONFIG_NETLABEL worked, and broke older SElinux
policies.
As a result, quoth James Morris:
"Can you please revert this patch?
We thought it only affected people running MLS, but it will affect others.
Sorry for the hassle."
Cc: James Morris <jmorris@namei.org>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: Michal Piotrowski <michal.k.k.piotrowski@gmail.com>
Cc: Paul Moore <paul.moore@hp.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index aff8f46..78c3f98 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3129,19 +3129,17 @@
/**
* selinux_skb_extlbl_sid - Determine the external label of a packet
* @skb: the packet
+ * @base_sid: the SELinux SID to use as a context for MLS only external labels
* @sid: the packet's SID
*
* Description:
* Check the various different forms of external packet labeling and determine
- * the external SID for the packet. If only one form of external labeling is
- * present then it is used, if both labeled IPsec and NetLabel labels are
- * present then the SELinux type information is taken from the labeled IPsec
- * SA and the MLS sensitivity label information is taken from the NetLabel
- * security attributes. This bit of "magic" is done in the call to
- * selinux_netlbl_skbuff_getsid().
+ * the external SID for the packet.
*
*/
-static void selinux_skb_extlbl_sid(struct sk_buff *skb, u32 *sid)
+static void selinux_skb_extlbl_sid(struct sk_buff *skb,
+ u32 base_sid,
+ u32 *sid)
{
u32 xfrm_sid;
u32 nlbl_sid;
@@ -3149,9 +3147,10 @@
selinux_skb_xfrm_sid(skb, &xfrm_sid);
if (selinux_netlbl_skbuff_getsid(skb,
(xfrm_sid == SECSID_NULL ?
- SECINITSID_NETMSG : xfrm_sid),
+ base_sid : xfrm_sid),
&nlbl_sid) != 0)
nlbl_sid = SECSID_NULL;
+
*sid = (nlbl_sid == SECSID_NULL ? xfrm_sid : nlbl_sid);
}
@@ -3696,7 +3695,7 @@
if (sock && sock->sk->sk_family == PF_UNIX)
selinux_get_inode_sid(SOCK_INODE(sock), &peer_secid);
else if (skb)
- selinux_skb_extlbl_sid(skb, &peer_secid);
+ selinux_skb_extlbl_sid(skb, SECINITSID_UNLABELED, &peer_secid);
if (peer_secid == SECSID_NULL)
err = -EINVAL;
@@ -3757,7 +3756,7 @@
u32 newsid;
u32 peersid;
- selinux_skb_extlbl_sid(skb, &peersid);
+ selinux_skb_extlbl_sid(skb, SECINITSID_UNLABELED, &peersid);
if (peersid == SECSID_NULL) {
req->secid = sksec->sid;
req->peer_secid = SECSID_NULL;
@@ -3795,7 +3794,7 @@
{
struct sk_security_struct *sksec = sk->sk_security;
- selinux_skb_extlbl_sid(skb, &sksec->peer_sid);
+ selinux_skb_extlbl_sid(skb, SECINITSID_UNLABELED, &sksec->peer_sid);
}
static void selinux_req_classify_flow(const struct request_sock *req,
diff --git a/security/selinux/netlabel.c b/security/selinux/netlabel.c
index 8192e8b..e64eca2 100644
--- a/security/selinux/netlabel.c
+++ b/security/selinux/netlabel.c
@@ -158,7 +158,9 @@
netlbl_secattr_init(&secattr);
rc = netlbl_skbuff_getattr(skb, &secattr);
if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE)
- rc = security_netlbl_secattr_to_sid(&secattr, base_sid, sid);
+ rc = security_netlbl_secattr_to_sid(&secattr,
+ base_sid,
+ sid);
else
*sid = SECSID_NULL;
netlbl_secattr_destroy(&secattr);
@@ -196,7 +198,7 @@
if (netlbl_sock_getattr(sk, &secattr) == 0 &&
secattr.flags != NETLBL_SECATTR_NONE &&
security_netlbl_secattr_to_sid(&secattr,
- SECINITSID_NETMSG,
+ SECINITSID_UNLABELED,
&nlbl_peer_sid) == 0)
sksec->peer_sid = nlbl_peer_sid;
netlbl_secattr_destroy(&secattr);
@@ -293,32 +295,38 @@
struct avc_audit_data *ad)
{
int rc;
- u32 nlbl_sid;
- u32 perm;
+ u32 netlbl_sid;
+ u32 recv_perm;
- rc = selinux_netlbl_skbuff_getsid(skb, SECINITSID_NETMSG, &nlbl_sid);
+ rc = selinux_netlbl_skbuff_getsid(skb,
+ SECINITSID_UNLABELED,
+ &netlbl_sid);
if (rc != 0)
return rc;
- if (nlbl_sid == SECSID_NULL)
- nlbl_sid = SECINITSID_UNLABELED;
+
+ if (netlbl_sid == SECSID_NULL)
+ return 0;
switch (sksec->sclass) {
case SECCLASS_UDP_SOCKET:
- perm = UDP_SOCKET__RECVFROM;
+ recv_perm = UDP_SOCKET__RECVFROM;
break;
case SECCLASS_TCP_SOCKET:
- perm = TCP_SOCKET__RECVFROM;
+ recv_perm = TCP_SOCKET__RECVFROM;
break;
default:
- perm = RAWIP_SOCKET__RECVFROM;
+ recv_perm = RAWIP_SOCKET__RECVFROM;
}
- rc = avc_has_perm(sksec->sid, nlbl_sid, sksec->sclass, perm, ad);
+ rc = avc_has_perm(sksec->sid,
+ netlbl_sid,
+ sksec->sclass,
+ recv_perm,
+ ad);
if (rc == 0)
return 0;
- if (nlbl_sid != SECINITSID_UNLABELED)
- netlbl_skbuff_err(skb, rc);
+ netlbl_skbuff_err(skb, rc);
return rc;
}