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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 /net/core/scm.c
parentb47030c71dfd6c8cd5cb6e551b6f7f7cfc96f6a6 (diff)
downloadlinux-257b5358b32f17e0603b6ff57b13610b0e02348f.tar.bz2
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>
Diffstat (limited to 'net/core/scm.c')
-rw-r--r--net/core/scm.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/net/core/scm.c b/net/core/scm.c
index b88f6f9d0b97..681c976307b5 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;