diff options
| author | Eric W. Biederman <ebiederm@xmission.com> | 2013-02-02 00:25:43 -0800 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2013-02-13 06:15:21 -0800 |
| commit | 90602c7b192fdd3e6b7c7623479f4bc86ed7ee34 (patch) | |
| tree | 2f313b2bc00993566af1dd56e854bf319f4c9c55 /net/sunrpc | |
| parent | e572fc739822ad779493b8a72bd27f2101fc3373 (diff) | |
| download | lwn-90602c7b192fdd3e6b7c7623479f4bc86ed7ee34.tar.gz lwn-90602c7b192fdd3e6b7c7623479f4bc86ed7ee34.zip | |
sunrpc: Update gss uid to security context mapping.
- Use from_kuid when generating the on the wire uid values.
- Use make_kuid when reading on the wire values.
In gss_encode_v0_msg, since the uid in gss_upcall_msg is now a kuid_t
generate the necessary uid_t value on the stack copy it into
gss_msg->databuf where it can safely live until the message is no
longer needed.
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'net/sunrpc')
| -rw-r--r-- | net/sunrpc/auth_gss/auth_gss.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c index afbbcfb1078b..a3600671989a 100644 --- a/net/sunrpc/auth_gss/auth_gss.c +++ b/net/sunrpc/auth_gss/auth_gss.c @@ -395,8 +395,11 @@ gss_upcall_callback(struct rpc_task *task) static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg) { - gss_msg->msg.data = &gss_msg->uid; - gss_msg->msg.len = sizeof(gss_msg->uid); + uid_t uid = from_kuid(&init_user_ns, gss_msg->uid); + memcpy(gss_msg->databuf, &uid, sizeof(uid)); + gss_msg->msg.data = gss_msg->databuf; + gss_msg->msg.len = sizeof(uid); + BUG_ON(sizeof(uid) > UPCALL_BUF_LEN); } static void gss_encode_v1_msg(struct gss_upcall_msg *gss_msg, @@ -409,7 +412,7 @@ static void gss_encode_v1_msg(struct gss_upcall_msg *gss_msg, gss_msg->msg.len = sprintf(gss_msg->databuf, "mech=%s uid=%d ", mech->gm_name, - gss_msg->uid); + from_kuid(&init_user_ns, gss_msg->uid)); p += gss_msg->msg.len; if (clnt->cl_principal) { len = sprintf(p, "target=%s ", clnt->cl_principal); @@ -620,7 +623,8 @@ gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) struct gss_upcall_msg *gss_msg; struct rpc_pipe *pipe = RPC_I(filp->f_dentry->d_inode)->pipe; struct gss_cl_ctx *ctx; - uid_t uid; + uid_t id; + kuid_t uid; ssize_t err = -EFBIG; if (mlen > MSG_BUF_MAXSIZE) @@ -635,12 +639,18 @@ gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) goto err; end = (const void *)((char *)buf + mlen); - p = simple_get_bytes(buf, end, &uid, sizeof(uid)); + p = simple_get_bytes(buf, end, &id, sizeof(id)); if (IS_ERR(p)) { err = PTR_ERR(p); goto err; } + uid = make_kuid(&init_user_ns, id); + if (!uid_valid(uid)) { + err = -EINVAL; + goto err; + } + err = -ENOMEM; ctx = gss_alloc_context(); if (ctx == NULL) |