174c3cbe3SAl Viro #include "audit.h" 228a3a7ebSEric Paris #include <linux/fsnotify_backend.h> 374c3cbe3SAl Viro #include <linux/namei.h> 474c3cbe3SAl Viro #include <linux/mount.h> 5916d7576SAl Viro #include <linux/kthread.h> 65a0e3ad6STejun Heo #include <linux/slab.h> 774c3cbe3SAl Viro 874c3cbe3SAl Viro struct audit_tree; 974c3cbe3SAl Viro struct audit_chunk; 1074c3cbe3SAl Viro 1174c3cbe3SAl Viro struct audit_tree { 1274c3cbe3SAl Viro atomic_t count; 1374c3cbe3SAl Viro int goner; 1474c3cbe3SAl Viro struct audit_chunk *root; 1574c3cbe3SAl Viro struct list_head chunks; 1674c3cbe3SAl Viro struct list_head rules; 1774c3cbe3SAl Viro struct list_head list; 1874c3cbe3SAl Viro struct list_head same_root; 1974c3cbe3SAl Viro struct rcu_head head; 2074c3cbe3SAl Viro char pathname[]; 2174c3cbe3SAl Viro }; 2274c3cbe3SAl Viro 2374c3cbe3SAl Viro struct audit_chunk { 2474c3cbe3SAl Viro struct list_head hash; 25e61ce867SEric Paris struct fsnotify_mark mark; 2674c3cbe3SAl Viro struct list_head trees; /* with root here */ 2774c3cbe3SAl Viro int dead; 2874c3cbe3SAl Viro int count; 298f7b0ba1SAl Viro atomic_long_t refs; 3074c3cbe3SAl Viro struct rcu_head head; 3174c3cbe3SAl Viro struct node { 3274c3cbe3SAl Viro struct list_head list; 3374c3cbe3SAl Viro struct audit_tree *owner; 3474c3cbe3SAl Viro unsigned index; /* index; upper bit indicates 'will prune' */ 3574c3cbe3SAl Viro } owners[]; 3674c3cbe3SAl Viro }; 3774c3cbe3SAl Viro 3874c3cbe3SAl Viro static LIST_HEAD(tree_list); 3974c3cbe3SAl Viro static LIST_HEAD(prune_list); 40f1aaf262SImre Palik static struct task_struct *prune_thread; 4174c3cbe3SAl Viro 4274c3cbe3SAl Viro /* 4374c3cbe3SAl Viro * One struct chunk is attached to each inode of interest. 4474c3cbe3SAl Viro * We replace struct chunk on tagging/untagging. 4574c3cbe3SAl Viro * Rules have pointer to struct audit_tree. 4674c3cbe3SAl Viro * Rules have struct list_head rlist forming a list of rules over 4774c3cbe3SAl Viro * the same tree. 4874c3cbe3SAl Viro * References to struct chunk are collected at audit_inode{,_child}() 4974c3cbe3SAl Viro * time and used in AUDIT_TREE rule matching. 5074c3cbe3SAl Viro * These references are dropped at the same time we are calling 5174c3cbe3SAl Viro * audit_free_names(), etc. 5274c3cbe3SAl Viro * 5374c3cbe3SAl Viro * Cyclic lists galore: 5474c3cbe3SAl Viro * tree.chunks anchors chunk.owners[].list hash_lock 5574c3cbe3SAl Viro * tree.rules anchors rule.rlist audit_filter_mutex 5674c3cbe3SAl Viro * chunk.trees anchors tree.same_root hash_lock 5774c3cbe3SAl Viro * chunk.hash is a hash with middle bits of watch.inode as 5874c3cbe3SAl Viro * a hash function. RCU, hash_lock 5974c3cbe3SAl Viro * 6074c3cbe3SAl Viro * tree is refcounted; one reference for "some rules on rules_list refer to 6174c3cbe3SAl Viro * it", one for each chunk with pointer to it. 6274c3cbe3SAl Viro * 6328a3a7ebSEric Paris * chunk is refcounted by embedded fsnotify_mark + .refs (non-zero refcount 648f7b0ba1SAl Viro * of watch contributes 1 to .refs). 6574c3cbe3SAl Viro * 6674c3cbe3SAl Viro * node.index allows to get from node.list to containing chunk. 6774c3cbe3SAl Viro * MSB of that sucker is stolen to mark taggings that we might have to 6874c3cbe3SAl Viro * revert - several operations have very unpleasant cleanup logics and 6974c3cbe3SAl Viro * that makes a difference. Some. 7074c3cbe3SAl Viro */ 7174c3cbe3SAl Viro 7228a3a7ebSEric Paris static struct fsnotify_group *audit_tree_group; 7374c3cbe3SAl Viro 7474c3cbe3SAl Viro static struct audit_tree *alloc_tree(const char *s) 7574c3cbe3SAl Viro { 7674c3cbe3SAl Viro struct audit_tree *tree; 7774c3cbe3SAl Viro 7874c3cbe3SAl Viro tree = kmalloc(sizeof(struct audit_tree) + strlen(s) + 1, GFP_KERNEL); 7974c3cbe3SAl Viro if (tree) { 8074c3cbe3SAl Viro atomic_set(&tree->count, 1); 8174c3cbe3SAl Viro tree->goner = 0; 8274c3cbe3SAl Viro INIT_LIST_HEAD(&tree->chunks); 8374c3cbe3SAl Viro INIT_LIST_HEAD(&tree->rules); 8474c3cbe3SAl Viro INIT_LIST_HEAD(&tree->list); 8574c3cbe3SAl Viro INIT_LIST_HEAD(&tree->same_root); 8674c3cbe3SAl Viro tree->root = NULL; 8774c3cbe3SAl Viro strcpy(tree->pathname, s); 8874c3cbe3SAl Viro } 8974c3cbe3SAl Viro return tree; 9074c3cbe3SAl Viro } 9174c3cbe3SAl Viro 9274c3cbe3SAl Viro static inline void get_tree(struct audit_tree *tree) 9374c3cbe3SAl Viro { 9474c3cbe3SAl Viro atomic_inc(&tree->count); 9574c3cbe3SAl Viro } 9674c3cbe3SAl Viro 9774c3cbe3SAl Viro static inline void put_tree(struct audit_tree *tree) 9874c3cbe3SAl Viro { 9974c3cbe3SAl Viro if (atomic_dec_and_test(&tree->count)) 1003b097c46SLai Jiangshan kfree_rcu(tree, head); 10174c3cbe3SAl Viro } 10274c3cbe3SAl Viro 10374c3cbe3SAl Viro /* to avoid bringing the entire thing in audit.h */ 10474c3cbe3SAl Viro const char *audit_tree_path(struct audit_tree *tree) 10574c3cbe3SAl Viro { 10674c3cbe3SAl Viro return tree->pathname; 10774c3cbe3SAl Viro } 10874c3cbe3SAl Viro 1098f7b0ba1SAl Viro static void free_chunk(struct audit_chunk *chunk) 11074c3cbe3SAl Viro { 11174c3cbe3SAl Viro int i; 11274c3cbe3SAl Viro 11374c3cbe3SAl Viro for (i = 0; i < chunk->count; i++) { 11474c3cbe3SAl Viro if (chunk->owners[i].owner) 11574c3cbe3SAl Viro put_tree(chunk->owners[i].owner); 11674c3cbe3SAl Viro } 11774c3cbe3SAl Viro kfree(chunk); 11874c3cbe3SAl Viro } 11974c3cbe3SAl Viro 12074c3cbe3SAl Viro void audit_put_chunk(struct audit_chunk *chunk) 12174c3cbe3SAl Viro { 1228f7b0ba1SAl Viro if (atomic_long_dec_and_test(&chunk->refs)) 1238f7b0ba1SAl Viro free_chunk(chunk); 1248f7b0ba1SAl Viro } 1258f7b0ba1SAl Viro 1268f7b0ba1SAl Viro static void __put_chunk(struct rcu_head *rcu) 1278f7b0ba1SAl Viro { 1288f7b0ba1SAl Viro struct audit_chunk *chunk = container_of(rcu, struct audit_chunk, head); 1298f7b0ba1SAl Viro audit_put_chunk(chunk); 13074c3cbe3SAl Viro } 13174c3cbe3SAl Viro 132e61ce867SEric Paris static void audit_tree_destroy_watch(struct fsnotify_mark *entry) 13328a3a7ebSEric Paris { 13428a3a7ebSEric Paris struct audit_chunk *chunk = container_of(entry, struct audit_chunk, mark); 13528a3a7ebSEric Paris call_rcu(&chunk->head, __put_chunk); 13628a3a7ebSEric Paris } 13728a3a7ebSEric Paris 13828a3a7ebSEric Paris static struct audit_chunk *alloc_chunk(int count) 13928a3a7ebSEric Paris { 14028a3a7ebSEric Paris struct audit_chunk *chunk; 14128a3a7ebSEric Paris size_t size; 14228a3a7ebSEric Paris int i; 14328a3a7ebSEric Paris 14428a3a7ebSEric Paris size = offsetof(struct audit_chunk, owners) + count * sizeof(struct node); 14528a3a7ebSEric Paris chunk = kzalloc(size, GFP_KERNEL); 14628a3a7ebSEric Paris if (!chunk) 14728a3a7ebSEric Paris return NULL; 14828a3a7ebSEric Paris 14928a3a7ebSEric Paris INIT_LIST_HEAD(&chunk->hash); 15028a3a7ebSEric Paris INIT_LIST_HEAD(&chunk->trees); 15128a3a7ebSEric Paris chunk->count = count; 15228a3a7ebSEric Paris atomic_long_set(&chunk->refs, 1); 15328a3a7ebSEric Paris for (i = 0; i < count; i++) { 15428a3a7ebSEric Paris INIT_LIST_HEAD(&chunk->owners[i].list); 15528a3a7ebSEric Paris chunk->owners[i].index = i; 15628a3a7ebSEric Paris } 15728a3a7ebSEric Paris fsnotify_init_mark(&chunk->mark, audit_tree_destroy_watch); 158799b6014SMiklos Szeredi chunk->mark.mask = FS_IN_IGNORED; 15928a3a7ebSEric Paris return chunk; 16028a3a7ebSEric Paris } 16128a3a7ebSEric Paris 16274c3cbe3SAl Viro enum {HASH_SIZE = 128}; 16374c3cbe3SAl Viro static struct list_head chunk_hash_heads[HASH_SIZE]; 16474c3cbe3SAl Viro static __cacheline_aligned_in_smp DEFINE_SPINLOCK(hash_lock); 16574c3cbe3SAl Viro 16674c3cbe3SAl Viro static inline struct list_head *chunk_hash(const struct inode *inode) 16774c3cbe3SAl Viro { 16874c3cbe3SAl Viro unsigned long n = (unsigned long)inode / L1_CACHE_BYTES; 16974c3cbe3SAl Viro return chunk_hash_heads + n % HASH_SIZE; 17074c3cbe3SAl Viro } 17174c3cbe3SAl Viro 17228a3a7ebSEric Paris /* hash_lock & entry->lock is held by caller */ 17374c3cbe3SAl Viro static void insert_hash(struct audit_chunk *chunk) 17474c3cbe3SAl Viro { 175e61ce867SEric Paris struct fsnotify_mark *entry = &chunk->mark; 17628a3a7ebSEric Paris struct list_head *list; 17728a3a7ebSEric Paris 1782823e04dSEric Paris if (!entry->i.inode) 17928a3a7ebSEric Paris return; 1802823e04dSEric Paris list = chunk_hash(entry->i.inode); 18174c3cbe3SAl Viro list_add_rcu(&chunk->hash, list); 18274c3cbe3SAl Viro } 18374c3cbe3SAl Viro 18474c3cbe3SAl Viro /* called under rcu_read_lock */ 18574c3cbe3SAl Viro struct audit_chunk *audit_tree_lookup(const struct inode *inode) 18674c3cbe3SAl Viro { 18774c3cbe3SAl Viro struct list_head *list = chunk_hash(inode); 1886793a051SPaul E. McKenney struct audit_chunk *p; 18974c3cbe3SAl Viro 1906793a051SPaul E. McKenney list_for_each_entry_rcu(p, list, hash) { 19128a3a7ebSEric Paris /* mark.inode may have gone NULL, but who cares? */ 1922823e04dSEric Paris if (p->mark.i.inode == inode) { 1938f7b0ba1SAl Viro atomic_long_inc(&p->refs); 19474c3cbe3SAl Viro return p; 19574c3cbe3SAl Viro } 19674c3cbe3SAl Viro } 19774c3cbe3SAl Viro return NULL; 19874c3cbe3SAl Viro } 19974c3cbe3SAl Viro 20074c3cbe3SAl Viro int audit_tree_match(struct audit_chunk *chunk, struct audit_tree *tree) 20174c3cbe3SAl Viro { 20274c3cbe3SAl Viro int n; 20374c3cbe3SAl Viro for (n = 0; n < chunk->count; n++) 20474c3cbe3SAl Viro if (chunk->owners[n].owner == tree) 20574c3cbe3SAl Viro return 1; 20674c3cbe3SAl Viro return 0; 20774c3cbe3SAl Viro } 20874c3cbe3SAl Viro 20974c3cbe3SAl Viro /* tagging and untagging inodes with trees */ 21074c3cbe3SAl Viro 2118f7b0ba1SAl Viro static struct audit_chunk *find_chunk(struct node *p) 21274c3cbe3SAl Viro { 2138f7b0ba1SAl Viro int index = p->index & ~(1U<<31); 2148f7b0ba1SAl Viro p -= index; 2158f7b0ba1SAl Viro return container_of(p, struct audit_chunk, owners[0]); 2168f7b0ba1SAl Viro } 2178f7b0ba1SAl Viro 2188f7b0ba1SAl Viro static void untag_chunk(struct node *p) 2198f7b0ba1SAl Viro { 2208f7b0ba1SAl Viro struct audit_chunk *chunk = find_chunk(p); 221e61ce867SEric Paris struct fsnotify_mark *entry = &chunk->mark; 222f7a998a9SAl Viro struct audit_chunk *new = NULL; 22374c3cbe3SAl Viro struct audit_tree *owner; 22474c3cbe3SAl Viro int size = chunk->count - 1; 22574c3cbe3SAl Viro int i, j; 22674c3cbe3SAl Viro 22728a3a7ebSEric Paris fsnotify_get_mark(entry); 2288f7b0ba1SAl Viro 2298f7b0ba1SAl Viro spin_unlock(&hash_lock); 2308f7b0ba1SAl Viro 231f7a998a9SAl Viro if (size) 232f7a998a9SAl Viro new = alloc_chunk(size); 233f7a998a9SAl Viro 23428a3a7ebSEric Paris spin_lock(&entry->lock); 2352823e04dSEric Paris if (chunk->dead || !entry->i.inode) { 23628a3a7ebSEric Paris spin_unlock(&entry->lock); 237f7a998a9SAl Viro if (new) 238f7a998a9SAl Viro free_chunk(new); 2398f7b0ba1SAl Viro goto out; 24074c3cbe3SAl Viro } 24174c3cbe3SAl Viro 24274c3cbe3SAl Viro owner = p->owner; 24374c3cbe3SAl Viro 24474c3cbe3SAl Viro if (!size) { 24574c3cbe3SAl Viro chunk->dead = 1; 24674c3cbe3SAl Viro spin_lock(&hash_lock); 24774c3cbe3SAl Viro list_del_init(&chunk->trees); 24874c3cbe3SAl Viro if (owner->root == chunk) 24974c3cbe3SAl Viro owner->root = NULL; 25074c3cbe3SAl Viro list_del_init(&p->list); 25174c3cbe3SAl Viro list_del_rcu(&chunk->hash); 25274c3cbe3SAl Viro spin_unlock(&hash_lock); 25328a3a7ebSEric Paris spin_unlock(&entry->lock); 254e2a29943SLino Sanfilippo fsnotify_destroy_mark(entry, audit_tree_group); 2558f7b0ba1SAl Viro goto out; 25674c3cbe3SAl Viro } 25774c3cbe3SAl Viro 25874c3cbe3SAl Viro if (!new) 25974c3cbe3SAl Viro goto Fallback; 260f7a998a9SAl Viro 26128a3a7ebSEric Paris fsnotify_duplicate_mark(&new->mark, entry); 2625444e298SEric Paris if (fsnotify_add_mark(&new->mark, new->mark.group, new->mark.i.inode, NULL, 1)) { 2630fe33aaeSMiklos Szeredi fsnotify_put_mark(&new->mark); 26474c3cbe3SAl Viro goto Fallback; 26574c3cbe3SAl Viro } 26674c3cbe3SAl Viro 26774c3cbe3SAl Viro chunk->dead = 1; 26874c3cbe3SAl Viro spin_lock(&hash_lock); 26974c3cbe3SAl Viro list_replace_init(&chunk->trees, &new->trees); 27074c3cbe3SAl Viro if (owner->root == chunk) { 27174c3cbe3SAl Viro list_del_init(&owner->same_root); 27274c3cbe3SAl Viro owner->root = NULL; 27374c3cbe3SAl Viro } 27474c3cbe3SAl Viro 2756f5d5114SAl Viro for (i = j = 0; j <= size; i++, j++) { 27674c3cbe3SAl Viro struct audit_tree *s; 27774c3cbe3SAl Viro if (&chunk->owners[j] == p) { 27874c3cbe3SAl Viro list_del_init(&p->list); 27974c3cbe3SAl Viro i--; 28074c3cbe3SAl Viro continue; 28174c3cbe3SAl Viro } 28274c3cbe3SAl Viro s = chunk->owners[j].owner; 28374c3cbe3SAl Viro new->owners[i].owner = s; 28474c3cbe3SAl Viro new->owners[i].index = chunk->owners[j].index - j + i; 28574c3cbe3SAl Viro if (!s) /* result of earlier fallback */ 28674c3cbe3SAl Viro continue; 28774c3cbe3SAl Viro get_tree(s); 2886f5d5114SAl Viro list_replace_init(&chunk->owners[j].list, &new->owners[i].list); 28974c3cbe3SAl Viro } 29074c3cbe3SAl Viro 29174c3cbe3SAl Viro list_replace_rcu(&chunk->hash, &new->hash); 29274c3cbe3SAl Viro list_for_each_entry(owner, &new->trees, same_root) 29374c3cbe3SAl Viro owner->root = new; 29474c3cbe3SAl Viro spin_unlock(&hash_lock); 29528a3a7ebSEric Paris spin_unlock(&entry->lock); 296e2a29943SLino Sanfilippo fsnotify_destroy_mark(entry, audit_tree_group); 297b3e8692bSMiklos Szeredi fsnotify_put_mark(&new->mark); /* drop initial reference */ 2988f7b0ba1SAl Viro goto out; 29974c3cbe3SAl Viro 30074c3cbe3SAl Viro Fallback: 30174c3cbe3SAl Viro // do the best we can 30274c3cbe3SAl Viro spin_lock(&hash_lock); 30374c3cbe3SAl Viro if (owner->root == chunk) { 30474c3cbe3SAl Viro list_del_init(&owner->same_root); 30574c3cbe3SAl Viro owner->root = NULL; 30674c3cbe3SAl Viro } 30774c3cbe3SAl Viro list_del_init(&p->list); 30874c3cbe3SAl Viro p->owner = NULL; 30974c3cbe3SAl Viro put_tree(owner); 31074c3cbe3SAl Viro spin_unlock(&hash_lock); 31128a3a7ebSEric Paris spin_unlock(&entry->lock); 3128f7b0ba1SAl Viro out: 31328a3a7ebSEric Paris fsnotify_put_mark(entry); 3148f7b0ba1SAl Viro spin_lock(&hash_lock); 31574c3cbe3SAl Viro } 31674c3cbe3SAl Viro 31774c3cbe3SAl Viro static int create_chunk(struct inode *inode, struct audit_tree *tree) 31874c3cbe3SAl Viro { 319e61ce867SEric Paris struct fsnotify_mark *entry; 32074c3cbe3SAl Viro struct audit_chunk *chunk = alloc_chunk(1); 32174c3cbe3SAl Viro if (!chunk) 32274c3cbe3SAl Viro return -ENOMEM; 32374c3cbe3SAl Viro 32428a3a7ebSEric Paris entry = &chunk->mark; 3255444e298SEric Paris if (fsnotify_add_mark(entry, audit_tree_group, inode, NULL, 0)) { 3260fe33aaeSMiklos Szeredi fsnotify_put_mark(entry); 32774c3cbe3SAl Viro return -ENOSPC; 32874c3cbe3SAl Viro } 32974c3cbe3SAl Viro 33028a3a7ebSEric Paris spin_lock(&entry->lock); 33174c3cbe3SAl Viro spin_lock(&hash_lock); 33274c3cbe3SAl Viro if (tree->goner) { 33374c3cbe3SAl Viro spin_unlock(&hash_lock); 33474c3cbe3SAl Viro chunk->dead = 1; 33528a3a7ebSEric Paris spin_unlock(&entry->lock); 336e2a29943SLino Sanfilippo fsnotify_destroy_mark(entry, audit_tree_group); 33728a3a7ebSEric Paris fsnotify_put_mark(entry); 33874c3cbe3SAl Viro return 0; 33974c3cbe3SAl Viro } 34074c3cbe3SAl Viro chunk->owners[0].index = (1U << 31); 34174c3cbe3SAl Viro chunk->owners[0].owner = tree; 34274c3cbe3SAl Viro get_tree(tree); 34374c3cbe3SAl Viro list_add(&chunk->owners[0].list, &tree->chunks); 34474c3cbe3SAl Viro if (!tree->root) { 34574c3cbe3SAl Viro tree->root = chunk; 34674c3cbe3SAl Viro list_add(&tree->same_root, &chunk->trees); 34774c3cbe3SAl Viro } 34874c3cbe3SAl Viro insert_hash(chunk); 34974c3cbe3SAl Viro spin_unlock(&hash_lock); 35028a3a7ebSEric Paris spin_unlock(&entry->lock); 351b3e8692bSMiklos Szeredi fsnotify_put_mark(entry); /* drop initial reference */ 35274c3cbe3SAl Viro return 0; 35374c3cbe3SAl Viro } 35474c3cbe3SAl Viro 35574c3cbe3SAl Viro /* the first tagged inode becomes root of tree */ 35674c3cbe3SAl Viro static int tag_chunk(struct inode *inode, struct audit_tree *tree) 35774c3cbe3SAl Viro { 358e61ce867SEric Paris struct fsnotify_mark *old_entry, *chunk_entry; 35974c3cbe3SAl Viro struct audit_tree *owner; 36074c3cbe3SAl Viro struct audit_chunk *chunk, *old; 36174c3cbe3SAl Viro struct node *p; 36274c3cbe3SAl Viro int n; 36374c3cbe3SAl Viro 3645444e298SEric Paris old_entry = fsnotify_find_inode_mark(audit_tree_group, inode); 36528a3a7ebSEric Paris if (!old_entry) 36674c3cbe3SAl Viro return create_chunk(inode, tree); 36774c3cbe3SAl Viro 36828a3a7ebSEric Paris old = container_of(old_entry, struct audit_chunk, mark); 36974c3cbe3SAl Viro 37074c3cbe3SAl Viro /* are we already there? */ 37174c3cbe3SAl Viro spin_lock(&hash_lock); 37274c3cbe3SAl Viro for (n = 0; n < old->count; n++) { 37374c3cbe3SAl Viro if (old->owners[n].owner == tree) { 37474c3cbe3SAl Viro spin_unlock(&hash_lock); 37528a3a7ebSEric Paris fsnotify_put_mark(old_entry); 37674c3cbe3SAl Viro return 0; 37774c3cbe3SAl Viro } 37874c3cbe3SAl Viro } 37974c3cbe3SAl Viro spin_unlock(&hash_lock); 38074c3cbe3SAl Viro 38174c3cbe3SAl Viro chunk = alloc_chunk(old->count + 1); 382b4c30aadSAl Viro if (!chunk) { 38328a3a7ebSEric Paris fsnotify_put_mark(old_entry); 38474c3cbe3SAl Viro return -ENOMEM; 385b4c30aadSAl Viro } 38674c3cbe3SAl Viro 38728a3a7ebSEric Paris chunk_entry = &chunk->mark; 38828a3a7ebSEric Paris 38928a3a7ebSEric Paris spin_lock(&old_entry->lock); 3902823e04dSEric Paris if (!old_entry->i.inode) { 39128a3a7ebSEric Paris /* old_entry is being shot, lets just lie */ 39228a3a7ebSEric Paris spin_unlock(&old_entry->lock); 39328a3a7ebSEric Paris fsnotify_put_mark(old_entry); 39474c3cbe3SAl Viro free_chunk(chunk); 39528a3a7ebSEric Paris return -ENOENT; 39628a3a7ebSEric Paris } 39728a3a7ebSEric Paris 39828a3a7ebSEric Paris fsnotify_duplicate_mark(chunk_entry, old_entry); 3995444e298SEric Paris if (fsnotify_add_mark(chunk_entry, chunk_entry->group, chunk_entry->i.inode, NULL, 1)) { 40028a3a7ebSEric Paris spin_unlock(&old_entry->lock); 4010fe33aaeSMiklos Szeredi fsnotify_put_mark(chunk_entry); 40228a3a7ebSEric Paris fsnotify_put_mark(old_entry); 40374c3cbe3SAl Viro return -ENOSPC; 40474c3cbe3SAl Viro } 40528a3a7ebSEric Paris 40628a3a7ebSEric Paris /* even though we hold old_entry->lock, this is safe since chunk_entry->lock could NEVER have been grabbed before */ 40728a3a7ebSEric Paris spin_lock(&chunk_entry->lock); 40874c3cbe3SAl Viro spin_lock(&hash_lock); 40928a3a7ebSEric Paris 41028a3a7ebSEric Paris /* we now hold old_entry->lock, chunk_entry->lock, and hash_lock */ 41174c3cbe3SAl Viro if (tree->goner) { 41274c3cbe3SAl Viro spin_unlock(&hash_lock); 41374c3cbe3SAl Viro chunk->dead = 1; 41428a3a7ebSEric Paris spin_unlock(&chunk_entry->lock); 41528a3a7ebSEric Paris spin_unlock(&old_entry->lock); 41628a3a7ebSEric Paris 417e2a29943SLino Sanfilippo fsnotify_destroy_mark(chunk_entry, audit_tree_group); 41828a3a7ebSEric Paris 41928a3a7ebSEric Paris fsnotify_put_mark(chunk_entry); 42028a3a7ebSEric Paris fsnotify_put_mark(old_entry); 42174c3cbe3SAl Viro return 0; 42274c3cbe3SAl Viro } 42374c3cbe3SAl Viro list_replace_init(&old->trees, &chunk->trees); 42474c3cbe3SAl Viro for (n = 0, p = chunk->owners; n < old->count; n++, p++) { 42574c3cbe3SAl Viro struct audit_tree *s = old->owners[n].owner; 42674c3cbe3SAl Viro p->owner = s; 42774c3cbe3SAl Viro p->index = old->owners[n].index; 42874c3cbe3SAl Viro if (!s) /* result of fallback in untag */ 42974c3cbe3SAl Viro continue; 43074c3cbe3SAl Viro get_tree(s); 43174c3cbe3SAl Viro list_replace_init(&old->owners[n].list, &p->list); 43274c3cbe3SAl Viro } 43374c3cbe3SAl Viro p->index = (chunk->count - 1) | (1U<<31); 43474c3cbe3SAl Viro p->owner = tree; 43574c3cbe3SAl Viro get_tree(tree); 43674c3cbe3SAl Viro list_add(&p->list, &tree->chunks); 43774c3cbe3SAl Viro list_replace_rcu(&old->hash, &chunk->hash); 43874c3cbe3SAl Viro list_for_each_entry(owner, &chunk->trees, same_root) 43974c3cbe3SAl Viro owner->root = chunk; 44074c3cbe3SAl Viro old->dead = 1; 44174c3cbe3SAl Viro if (!tree->root) { 44274c3cbe3SAl Viro tree->root = chunk; 44374c3cbe3SAl Viro list_add(&tree->same_root, &chunk->trees); 44474c3cbe3SAl Viro } 44574c3cbe3SAl Viro spin_unlock(&hash_lock); 44628a3a7ebSEric Paris spin_unlock(&chunk_entry->lock); 44728a3a7ebSEric Paris spin_unlock(&old_entry->lock); 448e2a29943SLino Sanfilippo fsnotify_destroy_mark(old_entry, audit_tree_group); 449b3e8692bSMiklos Szeredi fsnotify_put_mark(chunk_entry); /* drop initial reference */ 45028a3a7ebSEric Paris fsnotify_put_mark(old_entry); /* pair to fsnotify_find mark_entry */ 45174c3cbe3SAl Viro return 0; 45274c3cbe3SAl Viro } 45374c3cbe3SAl Viro 4542991dd2bSRichard Guy Briggs static void audit_tree_log_remove_rule(struct audit_krule *rule) 45574c3cbe3SAl Viro { 45674c3cbe3SAl Viro struct audit_buffer *ab; 45774c3cbe3SAl Viro 45874c3cbe3SAl Viro ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE); 4590644ec0cSKees Cook if (unlikely(!ab)) 4600644ec0cSKees Cook return; 4619d960985SEric Paris audit_log_format(ab, "op="); 462e7df61f4SBurn Alting audit_log_string(ab, "remove_rule"); 4639d960985SEric Paris audit_log_format(ab, " dir="); 46474c3cbe3SAl Viro audit_log_untrustedstring(ab, rule->tree->pathname); 4659d960985SEric Paris audit_log_key(ab, rule->filterkey); 46674c3cbe3SAl Viro audit_log_format(ab, " list=%d res=1", rule->listnr); 46774c3cbe3SAl Viro audit_log_end(ab); 4680644ec0cSKees Cook } 4690644ec0cSKees Cook 4700644ec0cSKees Cook static void kill_rules(struct audit_tree *tree) 4710644ec0cSKees Cook { 4720644ec0cSKees Cook struct audit_krule *rule, *next; 4730644ec0cSKees Cook struct audit_entry *entry; 4740644ec0cSKees Cook 4750644ec0cSKees Cook list_for_each_entry_safe(rule, next, &tree->rules, rlist) { 4760644ec0cSKees Cook entry = container_of(rule, struct audit_entry, rule); 4770644ec0cSKees Cook 4780644ec0cSKees Cook list_del_init(&rule->rlist); 4790644ec0cSKees Cook if (rule->tree) { 4800644ec0cSKees Cook /* not a half-baked one */ 4812991dd2bSRichard Guy Briggs audit_tree_log_remove_rule(rule); 48274c3cbe3SAl Viro rule->tree = NULL; 48374c3cbe3SAl Viro list_del_rcu(&entry->list); 484e45aa212SAl Viro list_del(&entry->rule.list); 48574c3cbe3SAl Viro call_rcu(&entry->rcu, audit_free_rule_rcu); 48674c3cbe3SAl Viro } 48774c3cbe3SAl Viro } 48874c3cbe3SAl Viro } 48974c3cbe3SAl Viro 49074c3cbe3SAl Viro /* 49174c3cbe3SAl Viro * finish killing struct audit_tree 49274c3cbe3SAl Viro */ 49374c3cbe3SAl Viro static void prune_one(struct audit_tree *victim) 49474c3cbe3SAl Viro { 49574c3cbe3SAl Viro spin_lock(&hash_lock); 49674c3cbe3SAl Viro while (!list_empty(&victim->chunks)) { 49774c3cbe3SAl Viro struct node *p; 49874c3cbe3SAl Viro 49974c3cbe3SAl Viro p = list_entry(victim->chunks.next, struct node, list); 50074c3cbe3SAl Viro 5018f7b0ba1SAl Viro untag_chunk(p); 50274c3cbe3SAl Viro } 50374c3cbe3SAl Viro spin_unlock(&hash_lock); 50474c3cbe3SAl Viro put_tree(victim); 50574c3cbe3SAl Viro } 50674c3cbe3SAl Viro 50774c3cbe3SAl Viro /* trim the uncommitted chunks from tree */ 50874c3cbe3SAl Viro 50974c3cbe3SAl Viro static void trim_marked(struct audit_tree *tree) 51074c3cbe3SAl Viro { 51174c3cbe3SAl Viro struct list_head *p, *q; 51274c3cbe3SAl Viro spin_lock(&hash_lock); 51374c3cbe3SAl Viro if (tree->goner) { 51474c3cbe3SAl Viro spin_unlock(&hash_lock); 51574c3cbe3SAl Viro return; 51674c3cbe3SAl Viro } 51774c3cbe3SAl Viro /* reorder */ 51874c3cbe3SAl Viro for (p = tree->chunks.next; p != &tree->chunks; p = q) { 51974c3cbe3SAl Viro struct node *node = list_entry(p, struct node, list); 52074c3cbe3SAl Viro q = p->next; 52174c3cbe3SAl Viro if (node->index & (1U<<31)) { 52274c3cbe3SAl Viro list_del_init(p); 52374c3cbe3SAl Viro list_add(p, &tree->chunks); 52474c3cbe3SAl Viro } 52574c3cbe3SAl Viro } 52674c3cbe3SAl Viro 52774c3cbe3SAl Viro while (!list_empty(&tree->chunks)) { 52874c3cbe3SAl Viro struct node *node; 52974c3cbe3SAl Viro 53074c3cbe3SAl Viro node = list_entry(tree->chunks.next, struct node, list); 53174c3cbe3SAl Viro 53274c3cbe3SAl Viro /* have we run out of marked? */ 53374c3cbe3SAl Viro if (!(node->index & (1U<<31))) 53474c3cbe3SAl Viro break; 53574c3cbe3SAl Viro 5368f7b0ba1SAl Viro untag_chunk(node); 53774c3cbe3SAl Viro } 53874c3cbe3SAl Viro if (!tree->root && !tree->goner) { 53974c3cbe3SAl Viro tree->goner = 1; 54074c3cbe3SAl Viro spin_unlock(&hash_lock); 54174c3cbe3SAl Viro mutex_lock(&audit_filter_mutex); 54274c3cbe3SAl Viro kill_rules(tree); 54374c3cbe3SAl Viro list_del_init(&tree->list); 54474c3cbe3SAl Viro mutex_unlock(&audit_filter_mutex); 54574c3cbe3SAl Viro prune_one(tree); 54674c3cbe3SAl Viro } else { 54774c3cbe3SAl Viro spin_unlock(&hash_lock); 54874c3cbe3SAl Viro } 54974c3cbe3SAl Viro } 55074c3cbe3SAl Viro 551916d7576SAl Viro static void audit_schedule_prune(void); 552916d7576SAl Viro 55374c3cbe3SAl Viro /* called with audit_filter_mutex */ 55474c3cbe3SAl Viro int audit_remove_tree_rule(struct audit_krule *rule) 55574c3cbe3SAl Viro { 55674c3cbe3SAl Viro struct audit_tree *tree; 55774c3cbe3SAl Viro tree = rule->tree; 55874c3cbe3SAl Viro if (tree) { 55974c3cbe3SAl Viro spin_lock(&hash_lock); 56074c3cbe3SAl Viro list_del_init(&rule->rlist); 56174c3cbe3SAl Viro if (list_empty(&tree->rules) && !tree->goner) { 56274c3cbe3SAl Viro tree->root = NULL; 56374c3cbe3SAl Viro list_del_init(&tree->same_root); 56474c3cbe3SAl Viro tree->goner = 1; 56574c3cbe3SAl Viro list_move(&tree->list, &prune_list); 56674c3cbe3SAl Viro rule->tree = NULL; 56774c3cbe3SAl Viro spin_unlock(&hash_lock); 56874c3cbe3SAl Viro audit_schedule_prune(); 56974c3cbe3SAl Viro return 1; 57074c3cbe3SAl Viro } 57174c3cbe3SAl Viro rule->tree = NULL; 57274c3cbe3SAl Viro spin_unlock(&hash_lock); 57374c3cbe3SAl Viro return 1; 57474c3cbe3SAl Viro } 57574c3cbe3SAl Viro return 0; 57674c3cbe3SAl Viro } 57774c3cbe3SAl Viro 5781f707137SAl Viro static int compare_root(struct vfsmount *mnt, void *arg) 5791f707137SAl Viro { 5801f707137SAl Viro return mnt->mnt_root->d_inode == arg; 5811f707137SAl Viro } 5821f707137SAl Viro 58374c3cbe3SAl Viro void audit_trim_trees(void) 58474c3cbe3SAl Viro { 58574c3cbe3SAl Viro struct list_head cursor; 58674c3cbe3SAl Viro 58774c3cbe3SAl Viro mutex_lock(&audit_filter_mutex); 58874c3cbe3SAl Viro list_add(&cursor, &tree_list); 58974c3cbe3SAl Viro while (cursor.next != &tree_list) { 59074c3cbe3SAl Viro struct audit_tree *tree; 59198bc993fSAl Viro struct path path; 59274c3cbe3SAl Viro struct vfsmount *root_mnt; 59374c3cbe3SAl Viro struct node *node; 59474c3cbe3SAl Viro int err; 59574c3cbe3SAl Viro 59674c3cbe3SAl Viro tree = container_of(cursor.next, struct audit_tree, list); 59774c3cbe3SAl Viro get_tree(tree); 59874c3cbe3SAl Viro list_del(&cursor); 59974c3cbe3SAl Viro list_add(&cursor, &tree->list); 60074c3cbe3SAl Viro mutex_unlock(&audit_filter_mutex); 60174c3cbe3SAl Viro 60298bc993fSAl Viro err = kern_path(tree->pathname, 0, &path); 60374c3cbe3SAl Viro if (err) 60474c3cbe3SAl Viro goto skip_it; 60574c3cbe3SAl Viro 606589ff870SAl Viro root_mnt = collect_mounts(&path); 60798bc993fSAl Viro path_put(&path); 608be34d1a3SDavid Howells if (IS_ERR(root_mnt)) 60974c3cbe3SAl Viro goto skip_it; 61074c3cbe3SAl Viro 61174c3cbe3SAl Viro spin_lock(&hash_lock); 61274c3cbe3SAl Viro list_for_each_entry(node, &tree->chunks, list) { 61328a3a7ebSEric Paris struct audit_chunk *chunk = find_chunk(node); 61425985edcSLucas De Marchi /* this could be NULL if the watch is dying else where... */ 6152823e04dSEric Paris struct inode *inode = chunk->mark.i.inode; 61674c3cbe3SAl Viro node->index |= 1U<<31; 6171f707137SAl Viro if (iterate_mounts(compare_root, inode, root_mnt)) 61874c3cbe3SAl Viro node->index &= ~(1U<<31); 61974c3cbe3SAl Viro } 62074c3cbe3SAl Viro spin_unlock(&hash_lock); 62174c3cbe3SAl Viro trim_marked(tree); 62274c3cbe3SAl Viro drop_collected_mounts(root_mnt); 62374c3cbe3SAl Viro skip_it: 62412b2f117SChen Gang put_tree(tree); 62574c3cbe3SAl Viro mutex_lock(&audit_filter_mutex); 62674c3cbe3SAl Viro } 62774c3cbe3SAl Viro list_del(&cursor); 62874c3cbe3SAl Viro mutex_unlock(&audit_filter_mutex); 62974c3cbe3SAl Viro } 63074c3cbe3SAl Viro 63174c3cbe3SAl Viro int audit_make_tree(struct audit_krule *rule, char *pathname, u32 op) 63274c3cbe3SAl Viro { 63374c3cbe3SAl Viro 63474c3cbe3SAl Viro if (pathname[0] != '/' || 63574c3cbe3SAl Viro rule->listnr != AUDIT_FILTER_EXIT || 6365af75d8dSAl Viro op != Audit_equal || 63774c3cbe3SAl Viro rule->inode_f || rule->watch || rule->tree) 63874c3cbe3SAl Viro return -EINVAL; 63974c3cbe3SAl Viro rule->tree = alloc_tree(pathname); 64074c3cbe3SAl Viro if (!rule->tree) 64174c3cbe3SAl Viro return -ENOMEM; 64274c3cbe3SAl Viro return 0; 64374c3cbe3SAl Viro } 64474c3cbe3SAl Viro 64574c3cbe3SAl Viro void audit_put_tree(struct audit_tree *tree) 64674c3cbe3SAl Viro { 64774c3cbe3SAl Viro put_tree(tree); 64874c3cbe3SAl Viro } 64974c3cbe3SAl Viro 6501f707137SAl Viro static int tag_mount(struct vfsmount *mnt, void *arg) 6511f707137SAl Viro { 6521f707137SAl Viro return tag_chunk(mnt->mnt_root->d_inode, arg); 6531f707137SAl Viro } 6541f707137SAl Viro 655f1aaf262SImre Palik /* 656f1aaf262SImre Palik * That gets run when evict_chunk() ends up needing to kill audit_tree. 657f1aaf262SImre Palik * Runs from a separate thread. 658f1aaf262SImre Palik */ 659f1aaf262SImre Palik static int prune_tree_thread(void *unused) 660f1aaf262SImre Palik { 661f1aaf262SImre Palik for (;;) { 662f1aaf262SImre Palik set_current_state(TASK_INTERRUPTIBLE); 663f1aaf262SImre Palik if (list_empty(&prune_list)) 664f1aaf262SImre Palik schedule(); 665f1aaf262SImre Palik __set_current_state(TASK_RUNNING); 666f1aaf262SImre Palik 667f1aaf262SImre Palik mutex_lock(&audit_cmd_mutex); 668f1aaf262SImre Palik mutex_lock(&audit_filter_mutex); 669f1aaf262SImre Palik 670f1aaf262SImre Palik while (!list_empty(&prune_list)) { 671f1aaf262SImre Palik struct audit_tree *victim; 672f1aaf262SImre Palik 673f1aaf262SImre Palik victim = list_entry(prune_list.next, 674f1aaf262SImre Palik struct audit_tree, list); 675f1aaf262SImre Palik list_del_init(&victim->list); 676f1aaf262SImre Palik 677f1aaf262SImre Palik mutex_unlock(&audit_filter_mutex); 678f1aaf262SImre Palik 679f1aaf262SImre Palik prune_one(victim); 680f1aaf262SImre Palik 681f1aaf262SImre Palik mutex_lock(&audit_filter_mutex); 682f1aaf262SImre Palik } 683f1aaf262SImre Palik 684f1aaf262SImre Palik mutex_unlock(&audit_filter_mutex); 685f1aaf262SImre Palik mutex_unlock(&audit_cmd_mutex); 686f1aaf262SImre Palik } 687f1aaf262SImre Palik return 0; 688f1aaf262SImre Palik } 689f1aaf262SImre Palik 690f1aaf262SImre Palik static int audit_launch_prune(void) 691f1aaf262SImre Palik { 692f1aaf262SImre Palik if (prune_thread) 693f1aaf262SImre Palik return 0; 694f1aaf262SImre Palik prune_thread = kthread_create(prune_tree_thread, NULL, 695f1aaf262SImre Palik "audit_prune_tree"); 696f1aaf262SImre Palik if (IS_ERR(prune_thread)) { 697f1aaf262SImre Palik pr_err("cannot start thread audit_prune_tree"); 698f1aaf262SImre Palik prune_thread = NULL; 699f1aaf262SImre Palik return -ENOMEM; 700f1aaf262SImre Palik } else { 701f1aaf262SImre Palik wake_up_process(prune_thread); 702f1aaf262SImre Palik return 0; 703f1aaf262SImre Palik } 704f1aaf262SImre Palik } 705f1aaf262SImre Palik 70674c3cbe3SAl Viro /* called with audit_filter_mutex */ 70774c3cbe3SAl Viro int audit_add_tree_rule(struct audit_krule *rule) 70874c3cbe3SAl Viro { 70974c3cbe3SAl Viro struct audit_tree *seed = rule->tree, *tree; 71098bc993fSAl Viro struct path path; 7111f707137SAl Viro struct vfsmount *mnt; 71274c3cbe3SAl Viro int err; 71374c3cbe3SAl Viro 714736f3203SChen Gang rule->tree = NULL; 71574c3cbe3SAl Viro list_for_each_entry(tree, &tree_list, list) { 71674c3cbe3SAl Viro if (!strcmp(seed->pathname, tree->pathname)) { 71774c3cbe3SAl Viro put_tree(seed); 71874c3cbe3SAl Viro rule->tree = tree; 71974c3cbe3SAl Viro list_add(&rule->rlist, &tree->rules); 72074c3cbe3SAl Viro return 0; 72174c3cbe3SAl Viro } 72274c3cbe3SAl Viro } 72374c3cbe3SAl Viro tree = seed; 72474c3cbe3SAl Viro list_add(&tree->list, &tree_list); 72574c3cbe3SAl Viro list_add(&rule->rlist, &tree->rules); 72674c3cbe3SAl Viro /* do not set rule->tree yet */ 72774c3cbe3SAl Viro mutex_unlock(&audit_filter_mutex); 72874c3cbe3SAl Viro 729f1aaf262SImre Palik if (unlikely(!prune_thread)) { 730f1aaf262SImre Palik err = audit_launch_prune(); 731f1aaf262SImre Palik if (err) 732f1aaf262SImre Palik goto Err; 733f1aaf262SImre Palik } 734f1aaf262SImre Palik 73598bc993fSAl Viro err = kern_path(tree->pathname, 0, &path); 73674c3cbe3SAl Viro if (err) 73774c3cbe3SAl Viro goto Err; 738589ff870SAl Viro mnt = collect_mounts(&path); 73998bc993fSAl Viro path_put(&path); 740be34d1a3SDavid Howells if (IS_ERR(mnt)) { 741be34d1a3SDavid Howells err = PTR_ERR(mnt); 74274c3cbe3SAl Viro goto Err; 74374c3cbe3SAl Viro } 74474c3cbe3SAl Viro 74574c3cbe3SAl Viro get_tree(tree); 7461f707137SAl Viro err = iterate_mounts(tag_mount, tree, mnt); 74774c3cbe3SAl Viro drop_collected_mounts(mnt); 74874c3cbe3SAl Viro 74974c3cbe3SAl Viro if (!err) { 75074c3cbe3SAl Viro struct node *node; 75174c3cbe3SAl Viro spin_lock(&hash_lock); 75274c3cbe3SAl Viro list_for_each_entry(node, &tree->chunks, list) 75374c3cbe3SAl Viro node->index &= ~(1U<<31); 75474c3cbe3SAl Viro spin_unlock(&hash_lock); 75574c3cbe3SAl Viro } else { 75674c3cbe3SAl Viro trim_marked(tree); 75774c3cbe3SAl Viro goto Err; 75874c3cbe3SAl Viro } 75974c3cbe3SAl Viro 76074c3cbe3SAl Viro mutex_lock(&audit_filter_mutex); 76174c3cbe3SAl Viro if (list_empty(&rule->rlist)) { 76274c3cbe3SAl Viro put_tree(tree); 76374c3cbe3SAl Viro return -ENOENT; 76474c3cbe3SAl Viro } 76574c3cbe3SAl Viro rule->tree = tree; 76674c3cbe3SAl Viro put_tree(tree); 76774c3cbe3SAl Viro 76874c3cbe3SAl Viro return 0; 76974c3cbe3SAl Viro Err: 77074c3cbe3SAl Viro mutex_lock(&audit_filter_mutex); 77174c3cbe3SAl Viro list_del_init(&tree->list); 77274c3cbe3SAl Viro list_del_init(&tree->rules); 77374c3cbe3SAl Viro put_tree(tree); 77474c3cbe3SAl Viro return err; 77574c3cbe3SAl Viro } 77674c3cbe3SAl Viro 77774c3cbe3SAl Viro int audit_tag_tree(char *old, char *new) 77874c3cbe3SAl Viro { 77974c3cbe3SAl Viro struct list_head cursor, barrier; 78074c3cbe3SAl Viro int failed = 0; 7812096f759SAl Viro struct path path1, path2; 78274c3cbe3SAl Viro struct vfsmount *tagged; 78374c3cbe3SAl Viro int err; 78474c3cbe3SAl Viro 7852096f759SAl Viro err = kern_path(new, 0, &path2); 78674c3cbe3SAl Viro if (err) 78774c3cbe3SAl Viro return err; 7882096f759SAl Viro tagged = collect_mounts(&path2); 7892096f759SAl Viro path_put(&path2); 790be34d1a3SDavid Howells if (IS_ERR(tagged)) 791be34d1a3SDavid Howells return PTR_ERR(tagged); 79274c3cbe3SAl Viro 7932096f759SAl Viro err = kern_path(old, 0, &path1); 79474c3cbe3SAl Viro if (err) { 79574c3cbe3SAl Viro drop_collected_mounts(tagged); 79674c3cbe3SAl Viro return err; 79774c3cbe3SAl Viro } 79874c3cbe3SAl Viro 79974c3cbe3SAl Viro mutex_lock(&audit_filter_mutex); 80074c3cbe3SAl Viro list_add(&barrier, &tree_list); 80174c3cbe3SAl Viro list_add(&cursor, &barrier); 80274c3cbe3SAl Viro 80374c3cbe3SAl Viro while (cursor.next != &tree_list) { 80474c3cbe3SAl Viro struct audit_tree *tree; 8052096f759SAl Viro int good_one = 0; 80674c3cbe3SAl Viro 80774c3cbe3SAl Viro tree = container_of(cursor.next, struct audit_tree, list); 80874c3cbe3SAl Viro get_tree(tree); 80974c3cbe3SAl Viro list_del(&cursor); 81074c3cbe3SAl Viro list_add(&cursor, &tree->list); 81174c3cbe3SAl Viro mutex_unlock(&audit_filter_mutex); 81274c3cbe3SAl Viro 8132096f759SAl Viro err = kern_path(tree->pathname, 0, &path2); 8142096f759SAl Viro if (!err) { 8152096f759SAl Viro good_one = path_is_under(&path1, &path2); 8162096f759SAl Viro path_put(&path2); 81774c3cbe3SAl Viro } 81874c3cbe3SAl Viro 8192096f759SAl Viro if (!good_one) { 82074c3cbe3SAl Viro put_tree(tree); 82174c3cbe3SAl Viro mutex_lock(&audit_filter_mutex); 82274c3cbe3SAl Viro continue; 82374c3cbe3SAl Viro } 82474c3cbe3SAl Viro 8251f707137SAl Viro failed = iterate_mounts(tag_mount, tree, tagged); 82674c3cbe3SAl Viro if (failed) { 82774c3cbe3SAl Viro put_tree(tree); 82874c3cbe3SAl Viro mutex_lock(&audit_filter_mutex); 82974c3cbe3SAl Viro break; 83074c3cbe3SAl Viro } 83174c3cbe3SAl Viro 83274c3cbe3SAl Viro mutex_lock(&audit_filter_mutex); 83374c3cbe3SAl Viro spin_lock(&hash_lock); 83474c3cbe3SAl Viro if (!tree->goner) { 83574c3cbe3SAl Viro list_del(&tree->list); 83674c3cbe3SAl Viro list_add(&tree->list, &tree_list); 83774c3cbe3SAl Viro } 83874c3cbe3SAl Viro spin_unlock(&hash_lock); 83974c3cbe3SAl Viro put_tree(tree); 84074c3cbe3SAl Viro } 84174c3cbe3SAl Viro 84274c3cbe3SAl Viro while (barrier.prev != &tree_list) { 84374c3cbe3SAl Viro struct audit_tree *tree; 84474c3cbe3SAl Viro 84574c3cbe3SAl Viro tree = container_of(barrier.prev, struct audit_tree, list); 84674c3cbe3SAl Viro get_tree(tree); 84774c3cbe3SAl Viro list_del(&tree->list); 84874c3cbe3SAl Viro list_add(&tree->list, &barrier); 84974c3cbe3SAl Viro mutex_unlock(&audit_filter_mutex); 85074c3cbe3SAl Viro 85174c3cbe3SAl Viro if (!failed) { 85274c3cbe3SAl Viro struct node *node; 85374c3cbe3SAl Viro spin_lock(&hash_lock); 85474c3cbe3SAl Viro list_for_each_entry(node, &tree->chunks, list) 85574c3cbe3SAl Viro node->index &= ~(1U<<31); 85674c3cbe3SAl Viro spin_unlock(&hash_lock); 85774c3cbe3SAl Viro } else { 85874c3cbe3SAl Viro trim_marked(tree); 85974c3cbe3SAl Viro } 86074c3cbe3SAl Viro 86174c3cbe3SAl Viro put_tree(tree); 86274c3cbe3SAl Viro mutex_lock(&audit_filter_mutex); 86374c3cbe3SAl Viro } 86474c3cbe3SAl Viro list_del(&barrier); 86574c3cbe3SAl Viro list_del(&cursor); 86674c3cbe3SAl Viro mutex_unlock(&audit_filter_mutex); 8672096f759SAl Viro path_put(&path1); 86874c3cbe3SAl Viro drop_collected_mounts(tagged); 86974c3cbe3SAl Viro return failed; 87074c3cbe3SAl Viro } 87174c3cbe3SAl Viro 872916d7576SAl Viro 873916d7576SAl Viro static void audit_schedule_prune(void) 874916d7576SAl Viro { 875f1aaf262SImre Palik wake_up_process(prune_thread); 876916d7576SAl Viro } 877916d7576SAl Viro 878916d7576SAl Viro /* 879916d7576SAl Viro * ... and that one is done if evict_chunk() decides to delay until the end 880916d7576SAl Viro * of syscall. Runs synchronously. 881916d7576SAl Viro */ 882916d7576SAl Viro void audit_kill_trees(struct list_head *list) 883916d7576SAl Viro { 884916d7576SAl Viro mutex_lock(&audit_cmd_mutex); 885916d7576SAl Viro mutex_lock(&audit_filter_mutex); 886916d7576SAl Viro 887916d7576SAl Viro while (!list_empty(list)) { 888916d7576SAl Viro struct audit_tree *victim; 889916d7576SAl Viro 890916d7576SAl Viro victim = list_entry(list->next, struct audit_tree, list); 891916d7576SAl Viro kill_rules(victim); 892916d7576SAl Viro list_del_init(&victim->list); 893916d7576SAl Viro 894916d7576SAl Viro mutex_unlock(&audit_filter_mutex); 895916d7576SAl Viro 896916d7576SAl Viro prune_one(victim); 897916d7576SAl Viro 898916d7576SAl Viro mutex_lock(&audit_filter_mutex); 899916d7576SAl Viro } 900916d7576SAl Viro 901916d7576SAl Viro mutex_unlock(&audit_filter_mutex); 902916d7576SAl Viro mutex_unlock(&audit_cmd_mutex); 90374c3cbe3SAl Viro } 90474c3cbe3SAl Viro 90574c3cbe3SAl Viro /* 90674c3cbe3SAl Viro * Here comes the stuff asynchronous to auditctl operations 90774c3cbe3SAl Viro */ 90874c3cbe3SAl Viro 90974c3cbe3SAl Viro static void evict_chunk(struct audit_chunk *chunk) 91074c3cbe3SAl Viro { 91174c3cbe3SAl Viro struct audit_tree *owner; 912916d7576SAl Viro struct list_head *postponed = audit_killed_trees(); 913916d7576SAl Viro int need_prune = 0; 91474c3cbe3SAl Viro int n; 91574c3cbe3SAl Viro 91674c3cbe3SAl Viro if (chunk->dead) 91774c3cbe3SAl Viro return; 91874c3cbe3SAl Viro 91974c3cbe3SAl Viro chunk->dead = 1; 92074c3cbe3SAl Viro mutex_lock(&audit_filter_mutex); 92174c3cbe3SAl Viro spin_lock(&hash_lock); 92274c3cbe3SAl Viro while (!list_empty(&chunk->trees)) { 92374c3cbe3SAl Viro owner = list_entry(chunk->trees.next, 92474c3cbe3SAl Viro struct audit_tree, same_root); 92574c3cbe3SAl Viro owner->goner = 1; 92674c3cbe3SAl Viro owner->root = NULL; 92774c3cbe3SAl Viro list_del_init(&owner->same_root); 92874c3cbe3SAl Viro spin_unlock(&hash_lock); 929916d7576SAl Viro if (!postponed) { 93074c3cbe3SAl Viro kill_rules(owner); 93174c3cbe3SAl Viro list_move(&owner->list, &prune_list); 932916d7576SAl Viro need_prune = 1; 933916d7576SAl Viro } else { 934916d7576SAl Viro list_move(&owner->list, postponed); 935916d7576SAl Viro } 93674c3cbe3SAl Viro spin_lock(&hash_lock); 93774c3cbe3SAl Viro } 93874c3cbe3SAl Viro list_del_rcu(&chunk->hash); 93974c3cbe3SAl Viro for (n = 0; n < chunk->count; n++) 94074c3cbe3SAl Viro list_del_init(&chunk->owners[n].list); 94174c3cbe3SAl Viro spin_unlock(&hash_lock); 942f1aaf262SImre Palik mutex_unlock(&audit_filter_mutex); 943916d7576SAl Viro if (need_prune) 944916d7576SAl Viro audit_schedule_prune(); 94574c3cbe3SAl Viro } 94674c3cbe3SAl Viro 9473a9b16b4SEric Paris static int audit_tree_handle_event(struct fsnotify_group *group, 9487053aee2SJan Kara struct inode *to_tell, 949ce8f76fbSEric Paris struct fsnotify_mark *inode_mark, 9507053aee2SJan Kara struct fsnotify_mark *vfsmount_mark, 9517053aee2SJan Kara u32 mask, void *data, int data_type, 95245a22f4cSJan Kara const unsigned char *file_name, u32 cookie) 95374c3cbe3SAl Viro { 95483c4c4b0SJan Kara return 0; 95528a3a7ebSEric Paris } 95674c3cbe3SAl Viro 957e61ce867SEric Paris static void audit_tree_freeing_mark(struct fsnotify_mark *entry, struct fsnotify_group *group) 95828a3a7ebSEric Paris { 95928a3a7ebSEric Paris struct audit_chunk *chunk = container_of(entry, struct audit_chunk, mark); 96028a3a7ebSEric Paris 96174c3cbe3SAl Viro evict_chunk(chunk); 962b3e8692bSMiklos Szeredi 963b3e8692bSMiklos Szeredi /* 964b3e8692bSMiklos Szeredi * We are guaranteed to have at least one reference to the mark from 965b3e8692bSMiklos Szeredi * either the inode or the caller of fsnotify_destroy_mark(). 966b3e8692bSMiklos Szeredi */ 967b3e8692bSMiklos Szeredi BUG_ON(atomic_read(&entry->refcnt) < 1); 96874c3cbe3SAl Viro } 96974c3cbe3SAl Viro 97028a3a7ebSEric Paris static const struct fsnotify_ops audit_tree_ops = { 97128a3a7ebSEric Paris .handle_event = audit_tree_handle_event, 97228a3a7ebSEric Paris .freeing_mark = audit_tree_freeing_mark, 97374c3cbe3SAl Viro }; 97474c3cbe3SAl Viro 97574c3cbe3SAl Viro static int __init audit_tree_init(void) 97674c3cbe3SAl Viro { 97774c3cbe3SAl Viro int i; 97874c3cbe3SAl Viro 9790d2e2a1dSEric Paris audit_tree_group = fsnotify_alloc_group(&audit_tree_ops); 98028a3a7ebSEric Paris if (IS_ERR(audit_tree_group)) 98128a3a7ebSEric Paris audit_panic("cannot initialize fsnotify group for rectree watches"); 98274c3cbe3SAl Viro 98374c3cbe3SAl Viro for (i = 0; i < HASH_SIZE; i++) 98474c3cbe3SAl Viro INIT_LIST_HEAD(&chunk_hash_heads[i]); 98574c3cbe3SAl Viro 98674c3cbe3SAl Viro return 0; 98774c3cbe3SAl Viro } 98874c3cbe3SAl Viro __initcall(audit_tree_init); 989