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authorDavid S. Miller <davem@davemloft.net>2012-08-24 18:54:37 -0400
committerDavid S. Miller <davem@davemloft.net>2012-08-24 18:54:37 -0400
commite6acb384807406c1a6ad3ddc91191f7658e63b7a (patch)
tree7906d1bb402ac30e4efaa1bc6451b1c7a4b6e768 /net/core/scm.c
parent255e87657a84e21986e5d9070f3dee4aa8d1d531 (diff)
parent898132ae76d1aeb52301f10e8795c34fbb54e853 (diff)
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Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
This is an initial merge in of Eric Biederman's work to start adding user namespace support to the networking. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/scm.c')
-rw-r--r--net/core/scm.c31
1 files changed, 23 insertions, 8 deletions
diff --git a/net/core/scm.c b/net/core/scm.c
index 040cebeed45b..6ab491d6c26f 100644
--- a/net/core/scm.c
+++ b/net/core/scm.c
@@ -45,12 +45,17 @@
static __inline__ int scm_check_creds(struct ucred *creds)
{
const struct cred *cred = current_cred();
+ kuid_t uid = make_kuid(cred->user_ns, creds->uid);
+ kgid_t gid = make_kgid(cred->user_ns, creds->gid);
+
+ if (!uid_valid(uid) || !gid_valid(gid))
+ return -EINVAL;
if ((creds->pid == task_tgid_vnr(current) || capable(CAP_SYS_ADMIN)) &&
- ((creds->uid == cred->uid || creds->uid == cred->euid ||
- creds->uid == cred->suid) || capable(CAP_SETUID)) &&
- ((creds->gid == cred->gid || creds->gid == cred->egid ||
- creds->gid == cred->sgid) || capable(CAP_SETGID))) {
+ ((uid_eq(uid, cred->uid) || uid_eq(uid, cred->euid) ||
+ uid_eq(uid, cred->suid)) || capable(CAP_SETUID)) &&
+ ((gid_eq(gid, cred->gid) || gid_eq(gid, cred->egid) ||
+ gid_eq(gid, cred->sgid)) || capable(CAP_SETGID))) {
return 0;
}
return -EPERM;
@@ -149,6 +154,9 @@ int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *p)
goto error;
break;
case SCM_CREDENTIALS:
+ {
+ kuid_t uid;
+ kgid_t gid;
if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct ucred)))
goto error;
memcpy(&p->creds, CMSG_DATA(cmsg), sizeof(struct ucred));
@@ -166,22 +174,29 @@ int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *p)
p->pid = pid;
}
+ err = -EINVAL;
+ uid = make_kuid(current_user_ns(), p->creds.uid);
+ gid = make_kgid(current_user_ns(), p->creds.gid);
+ if (!uid_valid(uid) || !gid_valid(gid))
+ goto error;
+
if (!p->cred ||
- (p->cred->euid != p->creds.uid) ||
- (p->cred->egid != p->creds.gid)) {
+ !uid_eq(p->cred->euid, uid) ||
+ !gid_eq(p->cred->egid, 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.gid;
+ cred->uid = cred->euid = uid;
+ cred->gid = cred->egid = gid;
if (p->cred)
put_cred(p->cred);
p->cred = cred;
}
break;
+ }
default:
goto error;
}