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authorEric W. Biederman <ebiederm@xmission.com>2010-06-13 03:32:34 +0000
committerDavid S. Miller <davem@davemloft.net>2010-06-16 14:55:56 -0700
commit257b5358b32f17e0603b6ff57b13610b0e02348f (patch)
tree15c4887d45eb6ccfe32f5e67b5c0009e1e8dae6c
parentb47030c71dfd6c8cd5cb6e551b6f7f7cfc96f6a6 (diff)
downloadop-kernel-dev-257b5358b32f17e0603b6ff57b13610b0e02348f.zip
op-kernel-dev-257b5358b32f17e0603b6ff57b13610b0e02348f.tar.gz
scm: Capture the full credentials of the scm sender.
Start capturing not only the userspace pid, uid and gid values of the sending process but also the struct pid and struct cred of the sending process as well. This is in preparation for properly supporting SCM_CREDENTIALS for sockets that have different uid and/or pid namespaces at the different ends. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Acked-by: Serge E. Hallyn <serge@hallyn.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/net/scm.h28
-rw-r--r--net/core/scm.c24
2 files changed, 48 insertions, 4 deletions
diff --git a/include/net/scm.h b/include/net/scm.h
index 17d9d2e..3165650 100644
--- a/include/net/scm.h
+++ b/include/net/scm.h
@@ -19,6 +19,8 @@ struct scm_fp_list {
};
struct scm_cookie {
+ struct pid *pid; /* Skb credentials */
+ const struct cred *cred;
struct scm_fp_list *fp; /* Passed files */
struct ucred creds; /* Skb credentials */
#ifdef CONFIG_SECURITY_NETWORK
@@ -42,8 +44,27 @@ static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_co
{ }
#endif /* CONFIG_SECURITY_NETWORK */
+static __inline__ void scm_set_cred(struct scm_cookie *scm,
+ struct pid *pid, const struct cred *cred)
+{
+ scm->pid = get_pid(pid);
+ scm->cred = get_cred(cred);
+ cred_to_ucred(pid, cred, &scm->creds);
+}
+
+static __inline__ void scm_destroy_cred(struct scm_cookie *scm)
+{
+ put_pid(scm->pid);
+ scm->pid = NULL;
+
+ if (scm->cred)
+ put_cred(scm->cred);
+ scm->cred = NULL;
+}
+
static __inline__ void scm_destroy(struct scm_cookie *scm)
{
+ scm_destroy_cred(scm);
if (scm && scm->fp)
__scm_destroy(scm);
}
@@ -51,10 +72,7 @@ static __inline__ void scm_destroy(struct scm_cookie *scm)
static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
struct scm_cookie *scm)
{
- struct task_struct *p = current;
- scm->creds.uid = current_uid();
- scm->creds.gid = current_gid();
- scm->creds.pid = task_tgid_vnr(p);
+ scm_set_cred(scm, task_tgid(current), current_cred());
scm->fp = NULL;
unix_get_peersec_dgram(sock, scm);
if (msg->msg_controllen <= 0)
@@ -96,6 +114,8 @@ static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg,
if (test_bit(SOCK_PASSCRED, &sock->flags))
put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds);
+ scm_destroy_cred(scm);
+
scm_passec(sock, msg, scm);
if (!scm->fp)
diff --git a/net/core/scm.c b/net/core/scm.c
index b88f6f9..681c976 100644
--- a/net/core/scm.c
+++ b/net/core/scm.c
@@ -170,6 +170,30 @@ int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *p)
err = scm_check_creds(&p->creds);
if (err)
goto error;
+
+ if (pid_vnr(p->pid) != p->creds.pid) {
+ struct pid *pid;
+ err = -ESRCH;
+ pid = find_get_pid(p->creds.pid);
+ if (!pid)
+ goto error;
+ put_pid(p->pid);
+ p->pid = pid;
+ }
+
+ if ((p->cred->euid != p->creds.uid) ||
+ (p->cred->egid != p->creds.gid)) {
+ struct cred *cred;
+ err = -ENOMEM;
+ cred = prepare_creds();
+ if (!cred)
+ goto error;
+
+ cred->uid = cred->euid = p->creds.uid;
+ cred->gid = cred->egid = p->creds.uid;
+ put_cred(p->cred);
+ p->cred = cred;
+ }
break;
default:
goto error;
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