diff options
Diffstat (limited to 'kernel/cred.c')
| -rw-r--r-- | kernel/cred.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/kernel/cred.c b/kernel/cred.c index 006fcab..dd76cfe 100644 --- a/kernel/cred.c +++ b/kernel/cred.c @@ -147,7 +147,8 @@ static void put_cred_rcu(struct rcu_head *rcu) key_put(cred->thread_keyring); key_put(cred->request_key_auth); release_tgcred(cred); - put_group_info(cred->group_info); + if (cred->group_info) + put_group_info(cred->group_info); free_uid(cred->user); kmem_cache_free(cred_jar, cred); } @@ -781,6 +782,25 @@ EXPORT_SYMBOL(set_create_files_as); #ifdef CONFIG_DEBUG_CREDENTIALS +bool creds_are_invalid(const struct cred *cred) +{ + if (cred->magic != CRED_MAGIC) + return true; + if (atomic_read(&cred->usage) < atomic_read(&cred->subscribers)) + return true; +#ifdef CONFIG_SECURITY_SELINUX + if (selinux_is_enabled()) { + if ((unsigned long) cred->security < PAGE_SIZE) + return true; + if ((*(u32 *)cred->security & 0xffffff00) == + (POISON_FREE << 24 | POISON_FREE << 16 | POISON_FREE << 8)) + return true; + } +#endif + return false; +} +EXPORT_SYMBOL(creds_are_invalid); + /* * dump invalid credentials */ |
