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authorEric W. Biederman <ebiederm@xmission.com>2013-02-02 00:25:43 -0800
committerEric W. Biederman <ebiederm@xmission.com>2013-02-13 06:15:21 -0800
commit90602c7b192fdd3e6b7c7623479f4bc86ed7ee34 (patch)
tree2f313b2bc00993566af1dd56e854bf319f4c9c55 /net/sunrpc
parente572fc739822ad779493b8a72bd27f2101fc3373 (diff)
downloadlinux-90602c7b192fdd3e6b7c7623479f4bc86ed7ee34.tar.gz
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.c20
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 afbbcfb1078..a3600671989 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)