diff options
| -rw-r--r-- | include/linux/cred.h | 2 | ||||
| -rw-r--r-- | kernel/cred.c | 8 | ||||
| -rw-r--r-- | kernel/user_namespace.c | 8 | ||||
| -rw-r--r-- | security/keys/process_keys.c | 2 |
4 files changed, 10 insertions, 10 deletions
diff --git a/include/linux/cred.h b/include/linux/cred.h index d12c4e4..2c60ec8 100644 --- a/include/linux/cred.h +++ b/include/linux/cred.h @@ -146,7 +146,7 @@ struct cred { void *security; /* subjective LSM security */ #endif struct user_struct *user; /* real user ID subscription */ - struct user_namespace *user_ns; /* cached user->user_ns */ + struct user_namespace *user_ns; /* user_ns the caps and keyrings are relative to. */ struct group_info *group_info; /* supplementary groups for euid/fsgid */ struct rcu_head rcu; /* RCU deletion hook */ }; diff --git a/kernel/cred.c b/kernel/cred.c index 97b36ee..7a0d806 100644 --- a/kernel/cred.c +++ b/kernel/cred.c @@ -148,6 +148,7 @@ static void put_cred_rcu(struct rcu_head *rcu) if (cred->group_info) put_group_info(cred->group_info); free_uid(cred->user); + put_user_ns(cred->user_ns); kmem_cache_free(cred_jar, cred); } @@ -303,6 +304,7 @@ struct cred *prepare_creds(void) set_cred_subscribers(new, 0); get_group_info(new->group_info); get_uid(new->user); + get_user_ns(new->user_ns); #ifdef CONFIG_KEYS key_get(new->thread_keyring); @@ -412,11 +414,6 @@ int copy_creds(struct task_struct *p, unsigned long clone_flags) goto error_put; } - /* cache user_ns in cred. Doesn't need a refcount because it will - * stay pinned by cred->user - */ - new->user_ns = new->user->user_ns; - #ifdef CONFIG_KEYS /* new threads get their own thread keyrings if their parent already * had one */ @@ -676,6 +673,7 @@ struct cred *prepare_kernel_cred(struct task_struct *daemon) atomic_set(&new->usage, 1); set_cred_subscribers(new, 0); get_uid(new->user); + get_user_ns(new->user_ns); get_group_info(new->group_info); #ifdef CONFIG_KEYS diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c index f084083..58bb878 100644 --- a/kernel/user_namespace.c +++ b/kernel/user_namespace.c @@ -24,7 +24,7 @@ static struct kmem_cache *user_ns_cachep __read_mostly; */ int create_user_ns(struct cred *new) { - struct user_namespace *ns; + struct user_namespace *ns, *parent_ns = new->user_ns; struct user_struct *root_user; int n; @@ -57,8 +57,10 @@ int create_user_ns(struct cred *new) #endif /* tgcred will be cleared in our caller bc CLONE_THREAD won't be set */ - /* root_user holds a reference to ns, our reference can be dropped */ - put_user_ns(ns); + /* Leave the reference to our user_ns with the new cred */ + new->user_ns = ns; + + put_user_ns(parent_ns); return 0; } diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c index 70febff..447fb76 100644 --- a/security/keys/process_keys.c +++ b/security/keys/process_keys.c @@ -858,7 +858,7 @@ void key_replace_session_keyring(void) new-> sgid = old-> sgid; new->fsgid = old->fsgid; new->user = get_uid(old->user); - new->user_ns = new->user_ns; + new->user_ns = get_user_ns(new->user_ns); new->group_info = get_group_info(old->group_info); new->securebits = old->securebits; |
