diff options
Diffstat (limited to 'kernel/user.c')
| -rw-r--r-- | kernel/user.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/kernel/user.c b/kernel/user.c index 523175afeecd..693487dc940e 100644 --- a/kernel/user.c +++ b/kernel/user.c @@ -12,6 +12,7 @@ #include <linux/sched.h> #include <linux/slab.h> #include <linux/bitops.h> +#include <linux/key.h> /* * UID task count cache, to get fast user lookup in "alloc_uid" @@ -34,6 +35,10 @@ struct user_struct root_user = { .sigpending = ATOMIC_INIT(0), .mq_bytes = 0, .locked_shm = 0, +#ifdef CONFIG_KEYS + .uid_keyring = &root_user_keyring, + .session_keyring = &root_session_keyring, +#endif }; /* @@ -87,6 +92,8 @@ void free_uid(struct user_struct *up) { if (up && atomic_dec_and_lock(&up->__count, &uidhash_lock)) { uid_hash_remove(up); + key_put(up->uid_keyring); + key_put(up->session_keyring); kmem_cache_free(uid_cachep, up); spin_unlock(&uidhash_lock); } @@ -116,6 +123,11 @@ struct user_struct * alloc_uid(uid_t uid) new->mq_bytes = 0; new->locked_shm = 0; + if (alloc_uid_keyring(new) < 0) { + kmem_cache_free(uid_cachep, new); + return NULL; + } + /* * Before adding this, check whether we raced * on adding the same user already.. @@ -123,6 +135,8 @@ struct user_struct * alloc_uid(uid_t uid) spin_lock(&uidhash_lock); up = uid_hash_find(uid, hashent); if (up) { + key_put(new->uid_keyring); + key_put(new->session_keyring); kmem_cache_free(uid_cachep, new); } else { uid_hash_insert(new, hashent); @@ -146,8 +160,10 @@ void switch_uid(struct user_struct *new_user) old_user = current->user; atomic_inc(&new_user->processes); atomic_dec(&old_user->processes); + switch_uid_keyring(new_user); current->user = new_user; free_uid(old_user); + suid_keys(current); } |