Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

Pull user namespace changes from Eric Biederman:
 "This is a mostly modest set of changes to enable basic user namespace
  support.  This allows the code to code to compile with user namespaces
  enabled and removes the assumption there is only the initial user
  namespace.  Everything is converted except for the most complex of the
  filesystems: autofs4, 9p, afs, ceph, cifs, coda, fuse, gfs2, ncpfs,
  nfs, ocfs2 and xfs as those patches need a bit more review.

  The strategy is to push kuid_t and kgid_t values are far down into
  subsystems and filesystems as reasonable.  Leaving the make_kuid and
  from_kuid operations to happen at the edge of userspace, as the values
  come off the disk, and as the values come in from the network.
  Letting compile type incompatible compile errors (present when user
  namespaces are enabled) guide me to find the issues.

  The most tricky areas have been the places where we had an implicit
  union of uid and gid values and were storing them in an unsigned int.
  Those places were converted into explicit unions.  I made certain to
  handle those places with simple trivial patches.

  Out of that work I discovered we have generic interfaces for storing
  quota by projid.  I had never heard of the project identifiers before.
  Adding full user namespace support for project identifiers accounts
  for most of the code size growth in my git tree.

  Ultimately there will be work to relax privlige checks from
  "capable(FOO)" to "ns_capable(user_ns, FOO)" where it is safe allowing
  root in a user names to do those things that today we only forbid to
  non-root users because it will confuse suid root applications.

  While I was pushing kuid_t and kgid_t changes deep into the audit code
  I made a few other cleanups.  I capitalized on the fact we process
  netlink messages in the context of the message sender.  I removed
  usage of NETLINK_CRED, and started directly using current->tty.

  Some of these patches have also made it into maintainer trees, with no
  problems from identical code from different trees showing up in
  linux-next.

  After reading through all of this code I feel like I might be able to
  win a game of kernel trivial pursuit."

Fix up some fairly trivial conflicts in netfilter uid/git logging code.

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (107 commits)
  userns: Convert the ufs filesystem to use kuid/kgid where appropriate
  userns: Convert the udf filesystem to use kuid/kgid where appropriate
  userns: Convert ubifs to use kuid/kgid
  userns: Convert squashfs to use kuid/kgid where appropriate
  userns: Convert reiserfs to use kuid and kgid where appropriate
  userns: Convert jfs to use kuid/kgid where appropriate
  userns: Convert jffs2 to use kuid and kgid where appropriate
  userns: Convert hpfs to use kuid and kgid where appropriate
  userns: Convert btrfs to use kuid/kgid where appropriate
  userns: Convert bfs to use kuid/kgid where appropriate
  userns: Convert affs to use kuid/kgid wherwe appropriate
  userns: On alpha modify linux_to_osf_stat to use convert from kuids and kgids
  userns: On ia64 deal with current_uid and current_gid being kuid and kgid
  userns: On ppc convert current_uid from a kuid before printing.
  userns: Convert s390 getting uid and gid system calls to use kuid and kgid
  userns: Convert s390 hypfs to use kuid and kgid where appropriate
  userns: Convert binder ipc to use kuids
  userns: Teach security_path_chown to take kuids and kgids
  userns: Add user namespace support to IMA
  userns: Convert EVM to deal with kuids and kgids in it's hmac computation
  ...

1 files changed, 8 insertions, 15 deletions

diff --git a/security/keys/key.c b/security/keys/key.c
index 3cbe352..a30e927 100644
--- a/security/keys/key.c
+++ b/security/keys/key.c
@@ -18,7 +18,6 @@
 #include <linux/workqueue.h>
 #include <linux/random.h>
 #include <linux/err.h>
-#include <linux/user_namespace.h>
 #include "internal.h"
 
 struct kmem_cache *key_jar;
@@ -52,7 +51,7 @@ void __key_check(const struct key *key)
  * Get the key quota record for a user, allocating a new record if one doesn't
  * already exist.
  */
-struct key_user *key_user_lookup(uid_t uid, struct user_namespace *user_ns)
+struct key_user *key_user_lookup(kuid_t uid)
 {
 	struct key_user *candidate = NULL, *user;
 	struct rb_node *parent = NULL;
@@ -67,13 +66,9 @@ try_again:
 		parent = *p;
 		user = rb_entry(parent, struct key_user, node);
 
-		if (uid < user->uid)
+		if (uid_lt(uid, user->uid))
 			p = &(*p)->rb_left;
-		else if (uid > user->uid)
-			p = &(*p)->rb_right;
-		else if (user_ns < user->user_ns)
-			p = &(*p)->rb_left;
-		else if (user_ns > user->user_ns)
+		else if (uid_gt(uid, user->uid))
 			p = &(*p)->rb_right;
 		else
 			goto found;
@@ -102,7 +97,6 @@ try_again:
 	atomic_set(&candidate->nkeys, 0);
 	atomic_set(&candidate->nikeys, 0);
 	candidate->uid = uid;
-	candidate->user_ns = get_user_ns(user_ns);
 	candidate->qnkeys = 0;
 	candidate->qnbytes = 0;
 	spin_lock_init(&candidate->lock);
@@ -131,7 +125,6 @@ void key_user_put(struct key_user *user)
 	if (atomic_dec_and_lock(&user->usage, &key_user_lock)) {
 		rb_erase(&user->node, &key_user_tree);
 		spin_unlock(&key_user_lock);
-		put_user_ns(user->user_ns);
 
 		kfree(user);
 	}
@@ -229,7 +222,7 @@ serial_exists:
  * key_alloc() calls don't race with module unloading.
  */
 struct key *key_alloc(struct key_type *type, const char *desc,
-		      uid_t uid, gid_t gid, const struct cred *cred,
+		      kuid_t uid, kgid_t gid, const struct cred *cred,
 		      key_perm_t perm, unsigned long flags)
 {
 	struct key_user *user = NULL;
@@ -253,16 +246,16 @@ struct key *key_alloc(struct key_type *type, const char *desc,
 	quotalen = desclen + type->def_datalen;
 
 	/* get hold of the key tracking for this user */
-	user = key_user_lookup(uid, cred->user_ns);
+	user = key_user_lookup(uid);
 	if (!user)
 		goto no_memory_1;
 
 	/* check that the user's quota permits allocation of another key and
 	 * its description */
 	if (!(flags & KEY_ALLOC_NOT_IN_QUOTA)) {
-		unsigned maxkeys = (uid == 0) ?
+		unsigned maxkeys = uid_eq(uid, GLOBAL_ROOT_UID) ?
 			key_quota_root_maxkeys : key_quota_maxkeys;
-		unsigned maxbytes = (uid == 0) ?
+		unsigned maxbytes = uid_eq(uid, GLOBAL_ROOT_UID) ?
 			key_quota_root_maxbytes : key_quota_maxbytes;
 
 		spin_lock(&user->lock);
@@ -380,7 +373,7 @@ int key_payload_reserve(struct key *key, size_t datalen)
 
 	/* contemplate the quota adjustment */
 	if (delta != 0 && test_bit(KEY_FLAG_IN_QUOTA, &key->flags)) {
-		unsigned maxbytes = (key->user->uid == 0) ?
+		unsigned maxbytes = uid_eq(key->user->uid, GLOBAL_ROOT_UID) ?
 			key_quota_root_maxbytes : key_quota_maxbytes;
 
 		spin_lock(&key->user->lock);