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authorStephen Smalley <sds@tycho.nsa.gov>2015-06-10 08:44:59 -0400
committerDavid S. Miller <davem@davemloft.net>2015-06-10 22:49:20 -0700
commit37a9a8df8ce9de6ea73349c9ac8bdf6ba4ec4f70 (patch)
tree255b2d8c931e665feabf697cfd28f633f44232ea /net/unix
parentbae23b6840a6a15947173d8282028458dbcdeb5b (diff)
net/unix: support SCM_SECURITY for stream sockets
SCM_SECURITY was originally only implemented for datagram sockets, not for stream sockets. However, SCM_CREDENTIALS is supported on Unix stream sockets. For consistency, implement Unix stream support for SCM_SECURITY as well. Also clean up the existing code and get rid of the superfluous UNIXSID macro. Motivated by https://bugzilla.redhat.com/show_bug.cgi?id=1224211, where systemd was using SCM_CREDENTIALS and assumed wrongly that SCM_SECURITY was also supported on Unix stream sockets. Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov> Acked-by: Paul Moore <paul@paul-moore.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/unix')
-rw-r--r--net/unix/af_unix.c20
1 files changed, 16 insertions, 4 deletions
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index f25e1675b865..03ee4d359f6a 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -140,12 +140,17 @@ static struct hlist_head *unix_sockets_unbound(void *addr)
#ifdef CONFIG_SECURITY_NETWORK
static void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb)
{
- memcpy(UNIXSID(skb), &scm->secid, sizeof(u32));
+ UNIXCB(skb).secid = scm->secid;
}
static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb)
{
- scm->secid = *UNIXSID(skb);
+ scm->secid = UNIXCB(skb).secid;
+}
+
+static inline bool unix_secdata_eq(struct scm_cookie *scm, struct sk_buff *skb)
+{
+ return (scm->secid == UNIXCB(skb).secid);
}
#else
static inline void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb)
@@ -153,6 +158,11 @@ static inline void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb)
static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb)
{ }
+
+static inline bool unix_secdata_eq(struct scm_cookie *scm, struct sk_buff *skb)
+{
+ return true;
+}
#endif /* CONFIG_SECURITY_NETWORK */
/*
@@ -1414,6 +1424,7 @@ static int unix_scm_to_skb(struct scm_cookie *scm, struct sk_buff *skb, bool sen
UNIXCB(skb).uid = scm->creds.uid;
UNIXCB(skb).gid = scm->creds.gid;
UNIXCB(skb).fp = NULL;
+ unix_get_secdata(scm, skb);
if (scm->fp && send_fds)
err = unix_attach_fds(scm, skb);
@@ -1509,7 +1520,6 @@ static int unix_dgram_sendmsg(struct socket *sock, struct msghdr *msg,
if (err < 0)
goto out_free;
max_level = err + 1;
- unix_get_secdata(&scm, skb);
skb_put(skb, len - data_len);
skb->data_len = data_len;
@@ -2118,11 +2128,13 @@ unlock:
/* Never glue messages from different writers */
if ((UNIXCB(skb).pid != scm.pid) ||
!uid_eq(UNIXCB(skb).uid, scm.creds.uid) ||
- !gid_eq(UNIXCB(skb).gid, scm.creds.gid))
+ !gid_eq(UNIXCB(skb).gid, scm.creds.gid) ||
+ !unix_secdata_eq(&scm, skb))
break;
} else if (test_bit(SOCK_PASSCRED, &sock->flags)) {
/* Copy credentials */
scm_set_cred(&scm, UNIXCB(skb).pid, UNIXCB(skb).uid, UNIXCB(skb).gid);
+ unix_set_secdata(&scm, skb);
check_creds = true;
}

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