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security/keys/key.c
24.9 KB
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/* Basic authentication token and access key management |
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* |
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* Copyright (C) 2004-2008 Red Hat, Inc. All Rights Reserved. |
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* Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <linux/module.h> #include <linux/init.h> |
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#include <linux/poison.h> |
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#include <linux/sched.h> #include <linux/slab.h> |
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#include <linux/security.h> |
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#include <linux/workqueue.h> |
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#include <linux/random.h> |
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#include <linux/err.h> |
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#include <linux/user_namespace.h> |
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#include "internal.h" |
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static struct kmem_cache *key_jar; |
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struct rb_root key_serial_tree; /* tree of keys indexed by serial */ DEFINE_SPINLOCK(key_serial_lock); struct rb_root key_user_tree; /* tree of quota records indexed by UID */ DEFINE_SPINLOCK(key_user_lock); |
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unsigned int key_quota_root_maxkeys = 200; /* root's key count quota */ unsigned int key_quota_root_maxbytes = 20000; /* root's key space quota */ unsigned int key_quota_maxkeys = 200; /* general key count quota */ unsigned int key_quota_maxbytes = 20000; /* general key space quota */ |
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static LIST_HEAD(key_types_list); static DECLARE_RWSEM(key_types_sem); |
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static void key_cleanup(struct work_struct *work); static DECLARE_WORK(key_cleanup_task, key_cleanup); |
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/* we serialise key instantiation and link */ |
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DEFINE_MUTEX(key_construction_mutex); |
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/* any key who's type gets unegistered will be re-typed to this */ |
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static struct key_type key_type_dead = { |
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.name = "dead", }; #ifdef KEY_DEBUGGING void __key_check(const struct key *key) { printk("__key_check: key %p {%08x} should be {%08x} ", key, key->magic, KEY_DEBUG_MAGIC); BUG(); } #endif /*****************************************************************************/ /* * get the key quota record for a user, allocating a new record if one doesn't * already exist */ |
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struct key_user *key_user_lookup(uid_t uid, struct user_namespace *user_ns) |
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{ struct key_user *candidate = NULL, *user; struct rb_node *parent = NULL; struct rb_node **p; try_again: p = &key_user_tree.rb_node; spin_lock(&key_user_lock); /* search the tree for a user record with a matching UID */ while (*p) { parent = *p; user = rb_entry(parent, struct key_user, node); if (uid < user->uid) p = &(*p)->rb_left; else if (uid > user->uid) p = &(*p)->rb_right; |
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else if (user_ns < user->user_ns) p = &(*p)->rb_left; else if (user_ns > user->user_ns) p = &(*p)->rb_right; |
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else goto found; } /* if we get here, we failed to find a match in the tree */ if (!candidate) { /* allocate a candidate user record if we don't already have * one */ spin_unlock(&key_user_lock); user = NULL; candidate = kmalloc(sizeof(struct key_user), GFP_KERNEL); if (unlikely(!candidate)) goto out; /* the allocation may have scheduled, so we need to repeat the * search lest someone else added the record whilst we were * asleep */ goto try_again; } /* if we get here, then the user record still hadn't appeared on the * second pass - so we use the candidate record */ atomic_set(&candidate->usage, 1); atomic_set(&candidate->nkeys, 0); atomic_set(&candidate->nikeys, 0); candidate->uid = uid; |
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candidate->user_ns = get_user_ns(user_ns); |
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candidate->qnkeys = 0; candidate->qnbytes = 0; spin_lock_init(&candidate->lock); |
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mutex_init(&candidate->cons_lock); |
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rb_link_node(&candidate->node, parent, p); rb_insert_color(&candidate->node, &key_user_tree); spin_unlock(&key_user_lock); user = candidate; goto out; /* okay - we found a user record for this UID */ found: atomic_inc(&user->usage); spin_unlock(&key_user_lock); |
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kfree(candidate); |
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out: return user; } /* end key_user_lookup() */ /*****************************************************************************/ /* * dispose of a user structure */ 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); |
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put_user_ns(user->user_ns); |
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kfree(user); } } /* end key_user_put() */ /*****************************************************************************/ /* |
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* assign a key the next unique serial number |
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* - these are assigned randomly to avoid security issues through covert * channel problems |
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*/ static inline void key_alloc_serial(struct key *key) { struct rb_node *parent, **p; struct key *xkey; |
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/* propose a random serial number and look for a hole for it in the |
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* serial number tree */ |
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do { get_random_bytes(&key->serial, sizeof(key->serial)); key->serial >>= 1; /* negative numbers are not permitted */ } while (key->serial < 3); spin_lock(&key_serial_lock); |
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|
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attempt_insertion: |
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parent = NULL; p = &key_serial_tree.rb_node; while (*p) { parent = *p; xkey = rb_entry(parent, struct key, serial_node); if (key->serial < xkey->serial) p = &(*p)->rb_left; else if (key->serial > xkey->serial) p = &(*p)->rb_right; else goto serial_exists; } |
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/* we've found a suitable hole - arrange for this key to occupy it */ rb_link_node(&key->serial_node, parent, p); rb_insert_color(&key->serial_node, &key_serial_tree); spin_unlock(&key_serial_lock); return; |
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/* we found a key with the proposed serial number - walk the tree from * that point looking for the next unused serial number */ |
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serial_exists: |
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for (;;) { |
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key->serial++; |
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if (key->serial < 3) { key->serial = 3; goto attempt_insertion; } |
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parent = rb_next(parent); if (!parent) |
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goto attempt_insertion; |
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xkey = rb_entry(parent, struct key, serial_node); if (key->serial < xkey->serial) |
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goto attempt_insertion; |
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} |
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} /* end key_alloc_serial() */ /*****************************************************************************/ /* * allocate a key of the specified type * - update the user's quota to reflect the existence of the key |
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* - called from a key-type operation with key_types_sem read-locked by * key_create_or_update() * - this prevents unregistration of the key type |
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* - upon return the key is as yet uninstantiated; the caller needs to either * instantiate the key or discard it before returning */ struct key *key_alloc(struct key_type *type, const char *desc, |
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uid_t uid, gid_t gid, const struct cred *cred, |
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key_perm_t perm, unsigned long flags) |
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{ struct key_user *user = NULL; struct key *key; size_t desclen, quotalen; |
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int ret; |
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key = ERR_PTR(-EINVAL); if (!desc || !*desc) goto error; desclen = strlen(desc) + 1; quotalen = desclen + type->def_datalen; /* get hold of the key tracking for this user */ |
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user = key_user_lookup(uid, cred->user->user_ns); |
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if (!user) goto no_memory_1; /* check that the user's quota permits allocation of another key and * its description */ |
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if (!(flags & KEY_ALLOC_NOT_IN_QUOTA)) { |
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unsigned maxkeys = (uid == 0) ? key_quota_root_maxkeys : key_quota_maxkeys; unsigned maxbytes = (uid == 0) ? key_quota_root_maxbytes : key_quota_maxbytes; |
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spin_lock(&user->lock); |
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if (!(flags & KEY_ALLOC_QUOTA_OVERRUN)) { |
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if (user->qnkeys + 1 >= maxkeys || user->qnbytes + quotalen >= maxbytes || user->qnbytes + quotalen < user->qnbytes) |
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goto no_quota; } |
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user->qnkeys++; user->qnbytes += quotalen; spin_unlock(&user->lock); } /* allocate and initialise the key and its description */ |
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key = kmem_cache_alloc(key_jar, GFP_KERNEL); |
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if (!key) goto no_memory_2; if (desc) { |
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key->description = kmemdup(desc, desclen, GFP_KERNEL); |
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if (!key->description) goto no_memory_3; |
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} atomic_set(&key->usage, 1); |
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init_rwsem(&key->sem); key->type = type; key->user = user; key->quotalen = quotalen; key->datalen = type->def_datalen; key->uid = uid; key->gid = gid; key->perm = perm; key->flags = 0; key->expiry = 0; key->payload.data = NULL; |
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key->security = NULL; |
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|
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if (!(flags & KEY_ALLOC_NOT_IN_QUOTA)) |
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key->flags |= 1 << KEY_FLAG_IN_QUOTA; |
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memset(&key->type_data, 0, sizeof(key->type_data)); #ifdef KEY_DEBUGGING key->magic = KEY_DEBUG_MAGIC; #endif |
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/* let the security module know about the key */ |
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ret = security_key_alloc(key, cred, flags); |
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if (ret < 0) goto security_error; |
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/* publish the key by giving it a serial number */ atomic_inc(&user->nkeys); key_alloc_serial(key); |
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error: |
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return key; |
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security_error: kfree(key->description); |
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kmem_cache_free(key_jar, key); |
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if (!(flags & KEY_ALLOC_NOT_IN_QUOTA)) { |
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spin_lock(&user->lock); user->qnkeys--; user->qnbytes -= quotalen; spin_unlock(&user->lock); } key_user_put(user); |
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key = ERR_PTR(ret); goto error; no_memory_3: kmem_cache_free(key_jar, key); no_memory_2: |
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if (!(flags & KEY_ALLOC_NOT_IN_QUOTA)) { |
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spin_lock(&user->lock); user->qnkeys--; user->qnbytes -= quotalen; spin_unlock(&user->lock); } key_user_put(user); no_memory_1: |
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key = ERR_PTR(-ENOMEM); goto error; |
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no_quota: |
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spin_unlock(&user->lock); key_user_put(user); key = ERR_PTR(-EDQUOT); goto error; } /* end key_alloc() */ EXPORT_SYMBOL(key_alloc); /*****************************************************************************/ /* * reserve an amount of quota for the key's payload */ int key_payload_reserve(struct key *key, size_t datalen) { |
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int delta = (int)datalen - key->datalen; |
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int ret = 0; key_check(key); /* contemplate the quota adjustment */ |
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if (delta != 0 && test_bit(KEY_FLAG_IN_QUOTA, &key->flags)) { |
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unsigned maxbytes = (key->user->uid == 0) ? key_quota_root_maxbytes : key_quota_maxbytes; |
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spin_lock(&key->user->lock); if (delta > 0 && |
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(key->user->qnbytes + delta >= maxbytes || key->user->qnbytes + delta < key->user->qnbytes)) { |
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ret = -EDQUOT; } else { key->user->qnbytes += delta; key->quotalen += delta; } spin_unlock(&key->user->lock); } /* change the recorded data length if that didn't generate an error */ if (ret == 0) key->datalen = datalen; return ret; } /* end key_payload_reserve() */ EXPORT_SYMBOL(key_payload_reserve); /*****************************************************************************/ /* * instantiate a key and link it into the target keyring atomically * - called with the target keyring's semaphore writelocked */ static int __key_instantiate_and_link(struct key *key, const void *data, size_t datalen, |
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struct key *keyring, |
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struct key *authkey, struct keyring_list **_prealloc) |
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{ int ret, awaken; key_check(key); key_check(keyring); awaken = 0; ret = -EBUSY; |
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mutex_lock(&key_construction_mutex); |
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/* can't instantiate twice */ |
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if (!test_bit(KEY_FLAG_INSTANTIATED, &key->flags)) { |
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/* instantiate the key */ ret = key->type->instantiate(key, data, datalen); if (ret == 0) { /* mark the key as being instantiated */ |
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atomic_inc(&key->user->nikeys); |
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set_bit(KEY_FLAG_INSTANTIATED, &key->flags); |
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|
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if (test_and_clear_bit(KEY_FLAG_USER_CONSTRUCT, &key->flags)) |
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awaken = 1; |
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/* and link it into the destination keyring */ if (keyring) |
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__key_link(keyring, key, _prealloc); |
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/* disable the authorisation key */ |
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if (authkey) key_revoke(authkey); |
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} } |
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mutex_unlock(&key_construction_mutex); |
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/* wake up anyone waiting for a key to be constructed */ if (awaken) |
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wake_up_bit(&key->flags, KEY_FLAG_USER_CONSTRUCT); |
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return ret; } /* end __key_instantiate_and_link() */ /*****************************************************************************/ /* * instantiate a key and link it into the target keyring atomically */ int key_instantiate_and_link(struct key *key, const void *data, size_t datalen, |
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struct key *keyring, |
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struct key *authkey) |
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{ |
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struct keyring_list *prealloc; |
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int ret; |
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if (keyring) { ret = __key_link_begin(keyring, key->type, key->description, &prealloc); if (ret < 0) return ret; } |
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ret = __key_instantiate_and_link(key, data, datalen, keyring, authkey, &prealloc); |
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if (keyring) |
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__key_link_end(keyring, key->type, prealloc); |
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return ret; |
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|
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} /* end key_instantiate_and_link() */ EXPORT_SYMBOL(key_instantiate_and_link); /*****************************************************************************/ /* * negatively instantiate a key and link it into the target keyring atomically */ int key_negate_and_link(struct key *key, unsigned timeout, |
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struct key *keyring, |
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struct key *authkey) |
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{ |
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struct keyring_list *prealloc; |
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struct timespec now; |
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int ret, awaken, link_ret = 0; |
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key_check(key); key_check(keyring); awaken = 0; ret = -EBUSY; if (keyring) |
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link_ret = __key_link_begin(keyring, key->type, key->description, &prealloc); |
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|
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mutex_lock(&key_construction_mutex); |
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/* can't instantiate twice */ |
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if (!test_bit(KEY_FLAG_INSTANTIATED, &key->flags)) { |
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/* mark the key as being negatively instantiated */ |
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atomic_inc(&key->user->nikeys); |
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set_bit(KEY_FLAG_NEGATIVE, &key->flags); set_bit(KEY_FLAG_INSTANTIATED, &key->flags); |
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now = current_kernel_time(); key->expiry = now.tv_sec + timeout; |
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key_schedule_gc(key->expiry + key_gc_delay); |
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|
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if (test_and_clear_bit(KEY_FLAG_USER_CONSTRUCT, &key->flags)) |
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awaken = 1; |
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|
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ret = 0; /* and link it into the destination keyring */ |
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if (keyring && link_ret == 0) __key_link(keyring, key, &prealloc); |
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/* disable the authorisation key */ |
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if (authkey) key_revoke(authkey); |
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511 |
} |
76181c134 KEYS: Make reques... |
512 |
mutex_unlock(&key_construction_mutex); |
1da177e4c Linux-2.6.12-rc2 |
513 514 |
if (keyring) |
f70e2e061 KEYS: Do prealloc... |
515 |
__key_link_end(keyring, key->type, prealloc); |
1da177e4c Linux-2.6.12-rc2 |
516 517 518 |
/* wake up anyone waiting for a key to be constructed */ if (awaken) |
76181c134 KEYS: Make reques... |
519 |
wake_up_bit(&key->flags, KEY_FLAG_USER_CONSTRUCT); |
1da177e4c Linux-2.6.12-rc2 |
520 |
|
f70e2e061 KEYS: Do prealloc... |
521 |
return ret == 0 ? link_ret : ret; |
1da177e4c Linux-2.6.12-rc2 |
522 523 524 525 526 527 528 529 530 531 |
} /* end key_negate_and_link() */ EXPORT_SYMBOL(key_negate_and_link); /*****************************************************************************/ /* * do cleaning up in process context so that we don't have to disable * interrupts all over the place */ |
65f27f384 WorkStruct: Pass ... |
532 |
static void key_cleanup(struct work_struct *work) |
1da177e4c Linux-2.6.12-rc2 |
533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 |
{ struct rb_node *_n; struct key *key; go_again: /* look for a dead key in the tree */ spin_lock(&key_serial_lock); for (_n = rb_first(&key_serial_tree); _n; _n = rb_next(_n)) { key = rb_entry(_n, struct key, serial_node); if (atomic_read(&key->usage) == 0) goto found_dead_key; } spin_unlock(&key_serial_lock); return; found_dead_key: /* we found a dead key - once we've removed it from the tree, we can * drop the lock */ rb_erase(&key->serial_node, &key_serial_tree); spin_unlock(&key_serial_lock); |
76d8aeabf [PATCH] keys: Dis... |
556 |
key_check(key); |
29db91906 [PATCH] Keys: Add... |
557 |
security_key_free(key); |
1da177e4c Linux-2.6.12-rc2 |
558 |
/* deal with the user's key tracking and quota */ |
76d8aeabf [PATCH] keys: Dis... |
559 |
if (test_bit(KEY_FLAG_IN_QUOTA, &key->flags)) { |
1da177e4c Linux-2.6.12-rc2 |
560 561 562 563 564 565 566 |
spin_lock(&key->user->lock); key->user->qnkeys--; key->user->qnbytes -= key->quotalen; spin_unlock(&key->user->lock); } atomic_dec(&key->user->nkeys); |
76d8aeabf [PATCH] keys: Dis... |
567 |
if (test_bit(KEY_FLAG_INSTANTIATED, &key->flags)) |
1da177e4c Linux-2.6.12-rc2 |
568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 |
atomic_dec(&key->user->nikeys); key_user_put(key->user); /* now throw away the key memory */ if (key->type->destroy) key->type->destroy(key); kfree(key->description); #ifdef KEY_DEBUGGING key->magic = KEY_DEBUG_MAGIC_X; #endif kmem_cache_free(key_jar, key); /* there may, of course, be more than one key to destroy */ goto go_again; } /* end key_cleanup() */ /*****************************************************************************/ /* * dispose of a reference to a key * - when all the references are gone, we schedule the cleanup task to come and * pull it out of the tree in definite process context */ void key_put(struct key *key) { if (key) { key_check(key); if (atomic_dec_and_test(&key->usage)) schedule_work(&key_cleanup_task); } } /* end key_put() */ EXPORT_SYMBOL(key_put); /*****************************************************************************/ /* * find a key by its serial number */ struct key *key_lookup(key_serial_t id) { struct rb_node *n; struct key *key; spin_lock(&key_serial_lock); /* search the tree for the specified key */ n = key_serial_tree.rb_node; while (n) { key = rb_entry(n, struct key, serial_node); if (id < key->serial) n = n->rb_left; else if (id > key->serial) n = n->rb_right; else goto found; } not_found: key = ERR_PTR(-ENOKEY); goto error; found: |
5593122ee KEYS: Deal with d... |
636 637 |
/* pretend it doesn't exist if it is awaiting deletion */ if (atomic_read(&key->usage) == 0) |
1da177e4c Linux-2.6.12-rc2 |
638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 |
goto not_found; /* this races with key_put(), but that doesn't matter since key_put() * doesn't actually change the key */ atomic_inc(&key->usage); error: spin_unlock(&key_serial_lock); return key; } /* end key_lookup() */ /*****************************************************************************/ /* * find and lock the specified key type against removal * - we return with the sem readlocked */ struct key_type *key_type_lookup(const char *type) { struct key_type *ktype; down_read(&key_types_sem); /* look up the key type to see if it's one of the registered kernel * types */ list_for_each_entry(ktype, &key_types_list, link) { if (strcmp(ktype->name, type) == 0) goto found_kernel_type; } up_read(&key_types_sem); ktype = ERR_PTR(-ENOKEY); found_kernel_type: return ktype; } /* end key_type_lookup() */ /*****************************************************************************/ /* * unlock a key type */ void key_type_put(struct key_type *ktype) { up_read(&key_types_sem); } /* end key_type_put() */ /*****************************************************************************/ /* * attempt to update an existing key * - the key has an incremented refcount * - we need to put the key if we get an error */ |
664cceb00 [PATCH] Keys: Add... |
693 694 |
static inline key_ref_t __key_update(key_ref_t key_ref, const void *payload, size_t plen) |
1da177e4c Linux-2.6.12-rc2 |
695 |
{ |
664cceb00 [PATCH] Keys: Add... |
696 |
struct key *key = key_ref_to_ptr(key_ref); |
1da177e4c Linux-2.6.12-rc2 |
697 698 699 |
int ret; /* need write permission on the key to update it */ |
29db91906 [PATCH] Keys: Add... |
700 701 |
ret = key_permission(key_ref, KEY_WRITE); if (ret < 0) |
1da177e4c Linux-2.6.12-rc2 |
702 703 704 705 706 707 708 709 710 |
goto error; ret = -EEXIST; if (!key->type->update) goto error; down_write(&key->sem); ret = key->type->update(key, payload, plen); |
76d8aeabf [PATCH] keys: Dis... |
711 |
if (ret == 0) |
1da177e4c Linux-2.6.12-rc2 |
712 |
/* updating a negative key instantiates it */ |
76d8aeabf [PATCH] keys: Dis... |
713 |
clear_bit(KEY_FLAG_NEGATIVE, &key->flags); |
1da177e4c Linux-2.6.12-rc2 |
714 715 716 717 718 |
up_write(&key->sem); if (ret < 0) goto error; |
664cceb00 [PATCH] Keys: Add... |
719 720 |
out: return key_ref; |
1da177e4c Linux-2.6.12-rc2 |
721 |
|
664cceb00 [PATCH] Keys: Add... |
722 |
error: |
1da177e4c Linux-2.6.12-rc2 |
723 |
key_put(key); |
664cceb00 [PATCH] Keys: Add... |
724 |
key_ref = ERR_PTR(ret); |
1da177e4c Linux-2.6.12-rc2 |
725 726 727 728 729 730 731 732 733 |
goto out; } /* end __key_update() */ /*****************************************************************************/ /* * search the specified keyring for a key of the same description; if one is * found, update it, otherwise add a new one */ |
664cceb00 [PATCH] Keys: Add... |
734 735 736 737 738 |
key_ref_t key_create_or_update(key_ref_t keyring_ref, const char *type, const char *description, const void *payload, size_t plen, |
6b79ccb51 keys: allow clien... |
739 |
key_perm_t perm, |
7e047ef5f [PATCH] keys: sor... |
740 |
unsigned long flags) |
1da177e4c Linux-2.6.12-rc2 |
741 |
{ |
f70e2e061 KEYS: Do prealloc... |
742 |
struct keyring_list *prealloc; |
d84f4f992 CRED: Inaugurate ... |
743 |
const struct cred *cred = current_cred(); |
1da177e4c Linux-2.6.12-rc2 |
744 |
struct key_type *ktype; |
664cceb00 [PATCH] Keys: Add... |
745 |
struct key *keyring, *key = NULL; |
664cceb00 [PATCH] Keys: Add... |
746 |
key_ref_t key_ref; |
1da177e4c Linux-2.6.12-rc2 |
747 |
int ret; |
1da177e4c Linux-2.6.12-rc2 |
748 749 750 751 |
/* look up the key type to see if it's one of the registered kernel * types */ ktype = key_type_lookup(type); if (IS_ERR(ktype)) { |
664cceb00 [PATCH] Keys: Add... |
752 |
key_ref = ERR_PTR(-ENODEV); |
1da177e4c Linux-2.6.12-rc2 |
753 754 |
goto error; } |
664cceb00 [PATCH] Keys: Add... |
755 |
key_ref = ERR_PTR(-EINVAL); |
1da177e4c Linux-2.6.12-rc2 |
756 757 |
if (!ktype->match || !ktype->instantiate) goto error_2; |
664cceb00 [PATCH] Keys: Add... |
758 759 760 |
keyring = key_ref_to_ptr(keyring_ref); key_check(keyring); |
c3a9d6541 [Security] Keys: ... |
761 762 763 |
key_ref = ERR_PTR(-ENOTDIR); if (keyring->type != &key_type_keyring) goto error_2; |
f70e2e061 KEYS: Do prealloc... |
764 765 766 |
ret = __key_link_begin(keyring, ktype, description, &prealloc); if (ret < 0) goto error_2; |
664cceb00 [PATCH] Keys: Add... |
767 768 769 |
/* if we're going to allocate a new key, we're going to have * to modify the keyring */ |
29db91906 [PATCH] Keys: Add... |
770 771 772 |
ret = key_permission(keyring_ref, KEY_WRITE); if (ret < 0) { key_ref = ERR_PTR(ret); |
664cceb00 [PATCH] Keys: Add... |
773 |
goto error_3; |
29db91906 [PATCH] Keys: Add... |
774 |
} |
664cceb00 [PATCH] Keys: Add... |
775 |
|
1d9b7d97d [PATCH] Keys: Rep... |
776 777 778 |
/* if it's possible to update this type of key, search for an existing * key of the same type and description in the destination keyring and * update that instead if possible |
1da177e4c Linux-2.6.12-rc2 |
779 |
*/ |
1d9b7d97d [PATCH] Keys: Rep... |
780 781 782 783 784 785 |
if (ktype->update) { key_ref = __keyring_search_one(keyring_ref, ktype, description, 0); if (!IS_ERR(key_ref)) goto found_matching_key; } |
1da177e4c Linux-2.6.12-rc2 |
786 |
|
6b79ccb51 keys: allow clien... |
787 788 789 790 |
/* if the client doesn't provide, decide on the permissions we want */ if (perm == KEY_PERM_UNDEF) { perm = KEY_POS_VIEW | KEY_POS_SEARCH | KEY_POS_LINK | KEY_POS_SETATTR; perm |= KEY_USR_VIEW | KEY_USR_SEARCH | KEY_USR_LINK | KEY_USR_SETATTR; |
1da177e4c Linux-2.6.12-rc2 |
791 |
|
6b79ccb51 keys: allow clien... |
792 793 |
if (ktype->read) perm |= KEY_POS_READ | KEY_USR_READ; |
1da177e4c Linux-2.6.12-rc2 |
794 |
|
6b79ccb51 keys: allow clien... |
795 796 797 |
if (ktype == &key_type_keyring || ktype->update) perm |= KEY_USR_WRITE; } |
1da177e4c Linux-2.6.12-rc2 |
798 799 |
/* allocate a new key */ |
d84f4f992 CRED: Inaugurate ... |
800 801 |
key = key_alloc(ktype, description, cred->fsuid, cred->fsgid, cred, perm, flags); |
1da177e4c Linux-2.6.12-rc2 |
802 |
if (IS_ERR(key)) { |
e231c2ee6 Convert ERR_PTR(P... |
803 |
key_ref = ERR_CAST(key); |
1da177e4c Linux-2.6.12-rc2 |
804 805 806 807 |
goto error_3; } /* instantiate it and link it into the target keyring */ |
f70e2e061 KEYS: Do prealloc... |
808 809 |
ret = __key_instantiate_and_link(key, payload, plen, keyring, NULL, &prealloc); |
1da177e4c Linux-2.6.12-rc2 |
810 811 |
if (ret < 0) { key_put(key); |
664cceb00 [PATCH] Keys: Add... |
812 813 |
key_ref = ERR_PTR(ret); goto error_3; |
1da177e4c Linux-2.6.12-rc2 |
814 |
} |
664cceb00 [PATCH] Keys: Add... |
815 |
key_ref = make_key_ref(key, is_key_possessed(keyring_ref)); |
1da177e4c Linux-2.6.12-rc2 |
816 |
error_3: |
f70e2e061 KEYS: Do prealloc... |
817 |
__key_link_end(keyring, ktype, prealloc); |
1da177e4c Linux-2.6.12-rc2 |
818 819 820 |
error_2: key_type_put(ktype); error: |
664cceb00 [PATCH] Keys: Add... |
821 |
return key_ref; |
1da177e4c Linux-2.6.12-rc2 |
822 823 824 825 826 |
found_matching_key: /* we found a matching key, so we're going to try to update it * - we can drop the locks first as we have the key pinned */ |
f70e2e061 KEYS: Do prealloc... |
827 |
__key_link_end(keyring, ktype, prealloc); |
1da177e4c Linux-2.6.12-rc2 |
828 |
key_type_put(ktype); |
664cceb00 [PATCH] Keys: Add... |
829 |
key_ref = __key_update(key_ref, payload, plen); |
1da177e4c Linux-2.6.12-rc2 |
830 831 832 833 834 835 836 837 838 839 |
goto error; } /* end key_create_or_update() */ EXPORT_SYMBOL(key_create_or_update); /*****************************************************************************/ /* * update a key */ |
664cceb00 [PATCH] Keys: Add... |
840 |
int key_update(key_ref_t key_ref, const void *payload, size_t plen) |
1da177e4c Linux-2.6.12-rc2 |
841 |
{ |
664cceb00 [PATCH] Keys: Add... |
842 |
struct key *key = key_ref_to_ptr(key_ref); |
1da177e4c Linux-2.6.12-rc2 |
843 844 845 846 847 |
int ret; key_check(key); /* the key must be writable */ |
29db91906 [PATCH] Keys: Add... |
848 849 |
ret = key_permission(key_ref, KEY_WRITE); if (ret < 0) |
1da177e4c Linux-2.6.12-rc2 |
850 851 852 853 854 855 |
goto error; /* attempt to update it if supported */ ret = -EOPNOTSUPP; if (key->type->update) { down_write(&key->sem); |
1da177e4c Linux-2.6.12-rc2 |
856 |
|
29db91906 [PATCH] Keys: Add... |
857 |
ret = key->type->update(key, payload, plen); |
76d8aeabf [PATCH] keys: Dis... |
858 |
if (ret == 0) |
1da177e4c Linux-2.6.12-rc2 |
859 |
/* updating a negative key instantiates it */ |
76d8aeabf [PATCH] keys: Dis... |
860 |
clear_bit(KEY_FLAG_NEGATIVE, &key->flags); |
1da177e4c Linux-2.6.12-rc2 |
861 862 863 864 865 866 867 868 869 870 871 872 873 |
up_write(&key->sem); } error: return ret; } /* end key_update() */ EXPORT_SYMBOL(key_update); /*****************************************************************************/ /* |
1da177e4c Linux-2.6.12-rc2 |
874 875 876 877 |
* revoke a key */ void key_revoke(struct key *key) { |
5d135440f KEYS: Add garbage... |
878 879 |
struct timespec now; time_t time; |
1da177e4c Linux-2.6.12-rc2 |
880 |
key_check(key); |
76181c134 KEYS: Make reques... |
881 882 883 884 885 886 887 888 |
/* make sure no one's trying to change or use the key when we mark it * - we tell lockdep that we might nest because we might be revoking an * authorisation key whilst holding the sem on a key we've just * instantiated */ down_write_nested(&key->sem, 1); if (!test_and_set_bit(KEY_FLAG_REVOKED, &key->flags) && key->type->revoke) |
04c567d93 [PATCH] Keys: Fix... |
889 |
key->type->revoke(key); |
5d135440f KEYS: Add garbage... |
890 891 892 893 894 |
/* set the death time to no more than the expiry time */ now = current_kernel_time(); time = now.tv_sec; if (key->revoked_at == 0 || key->revoked_at > time) { key->revoked_at = time; |
c08ef808e KEYS: Fix garbage... |
895 |
key_schedule_gc(key->revoked_at + key_gc_delay); |
5d135440f KEYS: Add garbage... |
896 |
} |
1da177e4c Linux-2.6.12-rc2 |
897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 |
up_write(&key->sem); } /* end key_revoke() */ EXPORT_SYMBOL(key_revoke); /*****************************************************************************/ /* * register a type of key */ int register_key_type(struct key_type *ktype) { struct key_type *p; int ret; ret = -EEXIST; down_write(&key_types_sem); /* disallow key types with the same name */ list_for_each_entry(p, &key_types_list, link) { if (strcmp(p->name, ktype->name) == 0) goto out; } /* store the type */ list_add(&ktype->link, &key_types_list); ret = 0; out: up_write(&key_types_sem); return ret; } /* end register_key_type() */ EXPORT_SYMBOL(register_key_type); /*****************************************************************************/ /* * unregister a type of key */ void unregister_key_type(struct key_type *ktype) { struct rb_node *_n; struct key *key; down_write(&key_types_sem); /* withdraw the key type */ list_del_init(&ktype->link); |
76d8aeabf [PATCH] keys: Dis... |
946 |
/* mark all the keys of this type dead */ |
1da177e4c Linux-2.6.12-rc2 |
947 948 949 950 |
spin_lock(&key_serial_lock); for (_n = rb_first(&key_serial_tree); _n; _n = rb_next(_n)) { key = rb_entry(_n, struct key, serial_node); |
f041ae2f9 KEYS: Flag dead k... |
951 |
if (key->type == ktype) { |
76d8aeabf [PATCH] keys: Dis... |
952 |
key->type = &key_type_dead; |
f041ae2f9 KEYS: Flag dead k... |
953 954 |
set_bit(KEY_FLAG_DEAD, &key->flags); } |
76d8aeabf [PATCH] keys: Dis... |
955 956 957 958 959 |
} spin_unlock(&key_serial_lock); /* make sure everyone revalidates their keys */ |
b2b186600 [PATCH] RCU: clea... |
960 |
synchronize_rcu(); |
76d8aeabf [PATCH] keys: Dis... |
961 962 963 964 |
/* we should now be able to destroy the payloads of all the keys of * this type with impunity */ spin_lock(&key_serial_lock); |
1da177e4c Linux-2.6.12-rc2 |
965 |
|
76d8aeabf [PATCH] keys: Dis... |
966 967 |
for (_n = rb_first(&key_serial_tree); _n; _n = rb_next(_n)) { key = rb_entry(_n, struct key, serial_node); |
1da177e4c Linux-2.6.12-rc2 |
968 |
|
76d8aeabf [PATCH] keys: Dis... |
969 970 971 |
if (key->type == ktype) { if (ktype->destroy) ktype->destroy(key); |
a7807a32b [PATCH] poison: a... |
972 |
memset(&key->payload, KEY_DESTROY, sizeof(key->payload)); |
76d8aeabf [PATCH] keys: Dis... |
973 |
} |
1da177e4c Linux-2.6.12-rc2 |
974 975 976 977 |
} spin_unlock(&key_serial_lock); up_write(&key_types_sem); |
5d135440f KEYS: Add garbage... |
978 |
key_schedule_gc(0); |
1da177e4c Linux-2.6.12-rc2 |
979 980 981 982 983 984 985 986 987 988 989 990 |
} /* end unregister_key_type() */ EXPORT_SYMBOL(unregister_key_type); /*****************************************************************************/ /* * initialise the key management stuff */ void __init key_init(void) { /* allocate a slab in which we can store keys */ key_jar = kmem_cache_create("key_jar", sizeof(struct key), |
20c2df83d mm: Remove slab d... |
991 |
0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
1da177e4c Linux-2.6.12-rc2 |
992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 |
/* add the special key types */ list_add_tail(&key_type_keyring.link, &key_types_list); list_add_tail(&key_type_dead.link, &key_types_list); list_add_tail(&key_type_user.link, &key_types_list); /* record the root user tracking */ rb_link_node(&root_key_user.node, NULL, &key_user_tree.rb_node); rb_insert_color(&root_key_user.node, &key_user_tree); |
1da177e4c Linux-2.6.12-rc2 |
1005 |
} /* end key_init() */ |