diff options
| author | Serge E. Hallyn <serue@us.ibm.com> | 2009-02-26 18:27:38 -0600 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2009-02-27 12:35:06 +1100 |
| commit | 1d1e97562e5e2ac60fb7b25437ba619f95f67fab (patch) | |
| tree | 68a9c52ecbff0782dd9b9438685afc3b40b6f707 /security/keys/key.c | |
| parent | be38e0fd5f90a91d09e0a85ffb294b70a7be6259 (diff) | |
keys: distinguish per-uid keys in different namespaces
per-uid keys were looked by uid only. Use the user namespace
to distinguish the same uid in different namespaces.
This does not address key_permission. So a task can for instance
try to join a keyring owned by the same uid in another namespace.
That will be handled by a separate patch.
Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/keys/key.c')
| -rw-r--r-- | security/keys/key.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/security/keys/key.c b/security/keys/key.c index f76c8a546fd..4a1297d1ada 100644 --- a/security/keys/key.c +++ b/security/keys/key.c @@ -18,6 +18,7 @@ #include <linux/workqueue.h> #include <linux/random.h> #include <linux/err.h> +#include <linux/user_namespace.h> #include "internal.h" static struct kmem_cache *key_jar; @@ -60,7 +61,7 @@ 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 key_user *key_user_lookup(uid_t uid, struct user_namespace *user_ns) { struct key_user *candidate = NULL, *user; struct rb_node *parent = NULL; @@ -79,6 +80,10 @@ struct key_user *key_user_lookup(uid_t 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) + p = &(*p)->rb_right; else goto found; } @@ -106,6 +111,7 @@ struct key_user *key_user_lookup(uid_t uid) 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); @@ -136,6 +142,7 @@ 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); } @@ -234,7 +241,7 @@ 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); + user = key_user_lookup(uid, cred->user->user_ns); if (!user) goto no_memory_1; |