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kernel/audit_tree.c
25.7 KB
b24413180 License cleanup: ... |
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// SPDX-License-Identifier: GPL-2.0 |
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#include "audit.h" |
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#include <linux/fsnotify_backend.h> |
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#include <linux/namei.h> #include <linux/mount.h> |
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#include <linux/kthread.h> |
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#include <linux/refcount.h> |
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#include <linux/slab.h> |
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struct audit_tree; struct audit_chunk; struct audit_tree { |
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refcount_t count; |
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int goner; struct audit_chunk *root; struct list_head chunks; struct list_head rules; struct list_head list; struct list_head same_root; struct rcu_head head; char pathname[]; }; struct audit_chunk { struct list_head hash; |
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unsigned long key; |
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struct fsnotify_mark *mark; |
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struct list_head trees; /* with root here */ |
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int count; |
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atomic_long_t refs; |
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struct rcu_head head; struct node { struct list_head list; struct audit_tree *owner; unsigned index; /* index; upper bit indicates 'will prune' */ } owners[]; }; |
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struct audit_tree_mark { struct fsnotify_mark mark; struct audit_chunk *chunk; }; |
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static LIST_HEAD(tree_list); static LIST_HEAD(prune_list); |
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static struct task_struct *prune_thread; |
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/* |
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* One struct chunk is attached to each inode of interest through * audit_tree_mark (fsnotify mark). We replace struct chunk on tagging / * untagging, the mark is stable as long as there is chunk attached. The * association between mark and chunk is protected by hash_lock and * audit_tree_group->mark_mutex. Thus as long as we hold * audit_tree_group->mark_mutex and check that the mark is alive by * FSNOTIFY_MARK_FLAG_ATTACHED flag check, we are sure the mark points to * the current chunk. * |
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* Rules have pointer to struct audit_tree. * Rules have struct list_head rlist forming a list of rules over * the same tree. * References to struct chunk are collected at audit_inode{,_child}() * time and used in AUDIT_TREE rule matching. * These references are dropped at the same time we are calling * audit_free_names(), etc. * * Cyclic lists galore: * tree.chunks anchors chunk.owners[].list hash_lock * tree.rules anchors rule.rlist audit_filter_mutex * chunk.trees anchors tree.same_root hash_lock * chunk.hash is a hash with middle bits of watch.inode as * a hash function. RCU, hash_lock * * tree is refcounted; one reference for "some rules on rules_list refer to * it", one for each chunk with pointer to it. * |
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* chunk is refcounted by embedded .refs. Mark associated with the chunk holds * one chunk reference. This reference is dropped either when a mark is going * to be freed (corresponding inode goes away) or when chunk attached to the * mark gets replaced. This reference must be dropped using * audit_mark_put_chunk() to make sure the reference is dropped only after RCU * grace period as it protects RCU readers of the hash table. |
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* * node.index allows to get from node.list to containing chunk. * MSB of that sucker is stolen to mark taggings that we might have to * revert - several operations have very unpleasant cleanup logics and * that makes a difference. Some. */ |
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static struct fsnotify_group *audit_tree_group; |
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static struct kmem_cache *audit_tree_mark_cachep __read_mostly; |
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static struct audit_tree *alloc_tree(const char *s) { struct audit_tree *tree; tree = kmalloc(sizeof(struct audit_tree) + strlen(s) + 1, GFP_KERNEL); if (tree) { |
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refcount_set(&tree->count, 1); |
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tree->goner = 0; INIT_LIST_HEAD(&tree->chunks); INIT_LIST_HEAD(&tree->rules); INIT_LIST_HEAD(&tree->list); INIT_LIST_HEAD(&tree->same_root); tree->root = NULL; strcpy(tree->pathname, s); } return tree; } static inline void get_tree(struct audit_tree *tree) { |
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refcount_inc(&tree->count); |
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} |
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static inline void put_tree(struct audit_tree *tree) { |
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if (refcount_dec_and_test(&tree->count)) |
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kfree_rcu(tree, head); |
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} /* to avoid bringing the entire thing in audit.h */ const char *audit_tree_path(struct audit_tree *tree) { return tree->pathname; } |
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static void free_chunk(struct audit_chunk *chunk) |
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{ |
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int i; for (i = 0; i < chunk->count; i++) { if (chunk->owners[i].owner) put_tree(chunk->owners[i].owner); } kfree(chunk); } |
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void audit_put_chunk(struct audit_chunk *chunk) |
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{ |
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if (atomic_long_dec_and_test(&chunk->refs)) free_chunk(chunk); |
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} |
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static void __put_chunk(struct rcu_head *rcu) |
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{ |
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struct audit_chunk *chunk = container_of(rcu, struct audit_chunk, head); audit_put_chunk(chunk); |
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} |
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/* * Drop reference to the chunk that was held by the mark. This is the reference * that gets dropped after we've removed the chunk from the hash table and we * use it to make sure chunk cannot be freed before RCU grace period expires. */ static void audit_mark_put_chunk(struct audit_chunk *chunk) { call_rcu(&chunk->head, __put_chunk); } |
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static inline struct audit_tree_mark *audit_mark(struct fsnotify_mark *mark) |
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{ |
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return container_of(mark, struct audit_tree_mark, mark); |
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} static struct audit_chunk *mark_chunk(struct fsnotify_mark *mark) { return audit_mark(mark)->chunk; } |
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static void audit_tree_destroy_watch(struct fsnotify_mark *mark) |
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{ |
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kmem_cache_free(audit_tree_mark_cachep, audit_mark(mark)); |
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} static struct fsnotify_mark *alloc_mark(void) { struct audit_tree_mark *amark; amark = kmem_cache_zalloc(audit_tree_mark_cachep, GFP_KERNEL); if (!amark) return NULL; fsnotify_init_mark(&amark->mark, audit_tree_group); amark->mark.mask = FS_IN_IGNORED; return &amark->mark; |
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} static struct audit_chunk *alloc_chunk(int count) { struct audit_chunk *chunk; size_t size; int i; size = offsetof(struct audit_chunk, owners) + count * sizeof(struct node); chunk = kzalloc(size, GFP_KERNEL); if (!chunk) return NULL; INIT_LIST_HEAD(&chunk->hash); INIT_LIST_HEAD(&chunk->trees); chunk->count = count; atomic_long_set(&chunk->refs, 1); for (i = 0; i < count; i++) { INIT_LIST_HEAD(&chunk->owners[i].list); chunk->owners[i].index = i; } |
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return chunk; } |
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enum {HASH_SIZE = 128}; static struct list_head chunk_hash_heads[HASH_SIZE]; static __cacheline_aligned_in_smp DEFINE_SPINLOCK(hash_lock); |
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/* Function to return search key in our hash from inode. */ static unsigned long inode_to_key(const struct inode *inode) |
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{ |
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/* Use address pointed to by connector->obj as the key */ return (unsigned long)&inode->i_fsnotify_marks; |
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} |
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static inline struct list_head *chunk_hash(unsigned long key) { unsigned long n = key / L1_CACHE_BYTES; |
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return chunk_hash_heads + n % HASH_SIZE; } |
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/* hash_lock & mark->group->mark_mutex is held by caller */ |
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static void insert_hash(struct audit_chunk *chunk) { |
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struct list_head *list; |
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/* * Make sure chunk is fully initialized before making it visible in the * hash. Pairs with a data dependency barrier in READ_ONCE() in * audit_tree_lookup(). */ smp_wmb(); |
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WARN_ON_ONCE(!chunk->key); list = chunk_hash(chunk->key); |
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list_add_rcu(&chunk->hash, list); } /* called under rcu_read_lock */ struct audit_chunk *audit_tree_lookup(const struct inode *inode) { |
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unsigned long key = inode_to_key(inode); struct list_head *list = chunk_hash(key); |
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struct audit_chunk *p; |
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|
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list_for_each_entry_rcu(p, list, hash) { |
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/* * We use a data dependency barrier in READ_ONCE() to make sure * the chunk we see is fully initialized. */ if (READ_ONCE(p->key) == key) { |
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atomic_long_inc(&p->refs); |
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return p; } } return NULL; } |
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bool audit_tree_match(struct audit_chunk *chunk, struct audit_tree *tree) |
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{ int n; for (n = 0; n < chunk->count; n++) if (chunk->owners[n].owner == tree) |
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return true; return false; |
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} /* tagging and untagging inodes with trees */ |
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static struct audit_chunk *find_chunk(struct node *p) { int index = p->index & ~(1U<<31); p -= index; return container_of(p, struct audit_chunk, owners[0]); } |
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static void replace_mark_chunk(struct fsnotify_mark *mark, |
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struct audit_chunk *chunk) { struct audit_chunk *old; assert_spin_locked(&hash_lock); |
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old = mark_chunk(mark); audit_mark(mark)->chunk = chunk; |
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if (chunk) |
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chunk->mark = mark; |
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if (old) old->mark = NULL; } |
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static void replace_chunk(struct audit_chunk *new, struct audit_chunk *old) |
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{ struct audit_tree *owner; int i, j; new->key = old->key; list_splice_init(&old->trees, &new->trees); list_for_each_entry(owner, &new->trees, same_root) owner->root = new; for (i = j = 0; j < old->count; i++, j++) { |
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if (!old->owners[j].owner) { |
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i--; continue; } owner = old->owners[j].owner; new->owners[i].owner = owner; new->owners[i].index = old->owners[j].index - j + i; if (!owner) /* result of earlier fallback */ continue; get_tree(owner); list_replace_init(&old->owners[j].list, &new->owners[i].list); } |
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replace_mark_chunk(old->mark, new); |
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/* * Make sure chunk is fully initialized before making it visible in the * hash. Pairs with a data dependency barrier in READ_ONCE() in * audit_tree_lookup(). */ smp_wmb(); list_replace_rcu(&old->hash, &new->hash); } |
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static void remove_chunk_node(struct audit_chunk *chunk, struct node *p) { struct audit_tree *owner = p->owner; if (owner->root == chunk) { list_del_init(&owner->same_root); owner->root = NULL; } list_del_init(&p->list); p->owner = NULL; put_tree(owner); } |
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static int chunk_count_trees(struct audit_chunk *chunk) { int i; int ret = 0; for (i = 0; i < chunk->count; i++) if (chunk->owners[i].owner) ret++; return ret; } |
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static void untag_chunk(struct audit_chunk *chunk, struct fsnotify_mark *mark) |
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{ |
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struct audit_chunk *new; |
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int size; |
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|
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mutex_lock(&audit_tree_group->mark_mutex); |
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/* |
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* mark_mutex stabilizes chunk attached to the mark so we can check * whether it didn't change while we've dropped hash_lock. |
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*/ |
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if (!(mark->flags & FSNOTIFY_MARK_FLAG_ATTACHED) || mark_chunk(mark) != chunk) |
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goto out_mutex; |
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|
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size = chunk_count_trees(chunk); |
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if (!size) { |
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spin_lock(&hash_lock); list_del_init(&chunk->trees); |
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list_del_rcu(&chunk->hash); |
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replace_mark_chunk(mark, NULL); |
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spin_unlock(&hash_lock); |
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fsnotify_detach_mark(mark); |
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mutex_unlock(&audit_tree_group->mark_mutex); |
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audit_mark_put_chunk(chunk); |
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fsnotify_free_mark(mark); |
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return; |
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} |
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new = alloc_chunk(size); |
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if (!new) |
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goto out_mutex; |
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|
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spin_lock(&hash_lock); |
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/* |
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* This has to go last when updating chunk as once replace_chunk() is * called, new RCU readers can see the new chunk. |
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*/ |
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replace_chunk(new, chunk); |
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spin_unlock(&hash_lock); |
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mutex_unlock(&audit_tree_group->mark_mutex); |
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audit_mark_put_chunk(chunk); |
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return; |
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|
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out_mutex: |
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mutex_unlock(&audit_tree_group->mark_mutex); |
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} |
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/* Call with group->mark_mutex held, releases it */ |
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static int create_chunk(struct inode *inode, struct audit_tree *tree) { |
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struct fsnotify_mark *mark; |
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struct audit_chunk *chunk = alloc_chunk(1); |
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if (!chunk) { mutex_unlock(&audit_tree_group->mark_mutex); |
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return -ENOMEM; |
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} |
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|
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mark = alloc_mark(); if (!mark) { |
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mutex_unlock(&audit_tree_group->mark_mutex); kfree(chunk); return -ENOMEM; } |
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if (fsnotify_add_inode_mark_locked(mark, inode, 0)) { |
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mutex_unlock(&audit_tree_group->mark_mutex); |
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fsnotify_put_mark(mark); |
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kfree(chunk); |
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return -ENOSPC; } |
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spin_lock(&hash_lock); if (tree->goner) { spin_unlock(&hash_lock); |
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fsnotify_detach_mark(mark); |
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mutex_unlock(&audit_tree_group->mark_mutex); |
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fsnotify_free_mark(mark); fsnotify_put_mark(mark); |
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kfree(chunk); |
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return 0; } |
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replace_mark_chunk(mark, chunk); |
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chunk->owners[0].index = (1U << 31); chunk->owners[0].owner = tree; get_tree(tree); list_add(&chunk->owners[0].list, &tree->chunks); if (!tree->root) { tree->root = chunk; list_add(&tree->same_root, &chunk->trees); } |
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chunk->key = inode_to_key(inode); |
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/* * Inserting into the hash table has to go last as once we do that RCU * readers can see the chunk. */ |
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insert_hash(chunk); spin_unlock(&hash_lock); |
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mutex_unlock(&audit_tree_group->mark_mutex); |
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/* * Drop our initial reference. When mark we point to is getting freed, * we get notification through ->freeing_mark callback and cleanup * chunk pointing to this mark. */ |
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fsnotify_put_mark(mark); |
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return 0; } /* the first tagged inode becomes root of tree */ static int tag_chunk(struct inode *inode, struct audit_tree *tree) { |
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struct fsnotify_mark *mark; |
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struct audit_chunk *chunk, *old; struct node *p; int n; |
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mutex_lock(&audit_tree_group->mark_mutex); |
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mark = fsnotify_find_mark(&inode->i_fsnotify_marks, audit_tree_group); if (!mark) |
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return create_chunk(inode, tree); |
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/* * Found mark is guaranteed to be attached and mark_mutex protects mark * from getting detached and thus it makes sure there is chunk attached * to the mark. */ |
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/* are we already there? */ spin_lock(&hash_lock); |
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old = mark_chunk(mark); |
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for (n = 0; n < old->count; n++) { if (old->owners[n].owner == tree) { spin_unlock(&hash_lock); |
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mutex_unlock(&audit_tree_group->mark_mutex); |
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fsnotify_put_mark(mark); |
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return 0; } } spin_unlock(&hash_lock); chunk = alloc_chunk(old->count + 1); |
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if (!chunk) { |
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mutex_unlock(&audit_tree_group->mark_mutex); |
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fsnotify_put_mark(mark); |
74c3cbe33 [PATCH] audit: wa... |
466 |
return -ENOMEM; |
b4c30aad3 fix more leaks in... |
467 |
} |
74c3cbe33 [PATCH] audit: wa... |
468 |
|
74c3cbe33 [PATCH] audit: wa... |
469 470 471 |
spin_lock(&hash_lock); if (tree->goner) { spin_unlock(&hash_lock); |
a5789b07b audit: Fix possib... |
472 |
mutex_unlock(&audit_tree_group->mark_mutex); |
f905c2fc3 audit: Use 'mark'... |
473 |
fsnotify_put_mark(mark); |
83d23bc8a audit: Replace ch... |
474 |
kfree(chunk); |
74c3cbe33 [PATCH] audit: wa... |
475 476 |
return 0; } |
d31b326d3 audit: Factor out... |
477 |
p = &chunk->owners[chunk->count - 1]; |
74c3cbe33 [PATCH] audit: wa... |
478 479 480 481 |
p->index = (chunk->count - 1) | (1U<<31); p->owner = tree; get_tree(tree); list_add(&p->list, &tree->chunks); |
74c3cbe33 [PATCH] audit: wa... |
482 483 484 485 |
if (!tree->root) { tree->root = chunk; list_add(&tree->same_root, &chunk->trees); } |
1635e5722 audit: Make hash ... |
486 |
/* |
d31b326d3 audit: Factor out... |
487 488 |
* This has to go last when updating chunk as once replace_chunk() is * called, new RCU readers can see the new chunk. |
1635e5722 audit: Make hash ... |
489 |
*/ |
c22fcde77 audit: Drop all u... |
490 |
replace_chunk(chunk, old); |
74c3cbe33 [PATCH] audit: wa... |
491 |
spin_unlock(&hash_lock); |
a5789b07b audit: Fix possib... |
492 |
mutex_unlock(&audit_tree_group->mark_mutex); |
f905c2fc3 audit: Use 'mark'... |
493 |
fsnotify_put_mark(mark); /* pair to fsnotify_find_mark */ |
83d23bc8a audit: Replace ch... |
494 |
audit_mark_put_chunk(old); |
74c3cbe33 [PATCH] audit: wa... |
495 496 |
return 0; } |
9e36a5d49 audit: hand taken... |
497 498 |
static void audit_tree_log_remove_rule(struct audit_context *context, struct audit_krule *rule) |
0644ec0cc audit: catch poss... |
499 500 |
{ struct audit_buffer *ab; |
65a8766f5 audit: check audi... |
501 502 |
if (!audit_enabled) return; |
9e36a5d49 audit: hand taken... |
503 |
ab = audit_log_start(context, GFP_KERNEL, AUDIT_CONFIG_CHANGE); |
0644ec0cc audit: catch poss... |
504 505 |
if (unlikely(!ab)) return; |
d0a3f18a7 audit: minimize o... |
506 |
audit_log_format(ab, "op=remove_rule dir="); |
0644ec0cc audit: catch poss... |
507 508 509 510 511 |
audit_log_untrustedstring(ab, rule->tree->pathname); audit_log_key(ab, rule->filterkey); audit_log_format(ab, " list=%d res=1", rule->listnr); audit_log_end(ab); } |
9e36a5d49 audit: hand taken... |
512 |
static void kill_rules(struct audit_context *context, struct audit_tree *tree) |
74c3cbe33 [PATCH] audit: wa... |
513 514 515 |
{ struct audit_krule *rule, *next; struct audit_entry *entry; |
74c3cbe33 [PATCH] audit: wa... |
516 517 518 519 520 521 522 |
list_for_each_entry_safe(rule, next, &tree->rules, rlist) { entry = container_of(rule, struct audit_entry, rule); list_del_init(&rule->rlist); if (rule->tree) { /* not a half-baked one */ |
9e36a5d49 audit: hand taken... |
523 |
audit_tree_log_remove_rule(context, rule); |
34d99af52 audit: implement ... |
524 525 |
if (entry->rule.exe) audit_remove_mark(entry->rule.exe); |
74c3cbe33 [PATCH] audit: wa... |
526 527 |
rule->tree = NULL; list_del_rcu(&entry->list); |
e45aa212e audit rules order... |
528 |
list_del(&entry->rule.list); |
74c3cbe33 [PATCH] audit: wa... |
529 530 531 532 533 534 |
call_rcu(&entry->rcu, audit_free_rule_rcu); } } } /* |
8432c7006 audit: Simplify l... |
535 536 537 |
* Remove tree from chunks. If 'tagged' is set, remove tree only from tagged * chunks. The function expects tagged chunks are all at the beginning of the * chunks list. |
74c3cbe33 [PATCH] audit: wa... |
538 |
*/ |
8432c7006 audit: Simplify l... |
539 |
static void prune_tree_chunks(struct audit_tree *victim, bool tagged) |
74c3cbe33 [PATCH] audit: wa... |
540 541 542 543 |
{ spin_lock(&hash_lock); while (!list_empty(&victim->chunks)) { struct node *p; |
8432c7006 audit: Simplify l... |
544 545 546 547 548 549 550 551 552 553 |
struct audit_chunk *chunk; struct fsnotify_mark *mark; p = list_first_entry(&victim->chunks, struct node, list); /* have we run out of marked? */ if (tagged && !(p->index & (1U<<31))) break; chunk = find_chunk(p); mark = chunk->mark; remove_chunk_node(chunk, p); |
83d23bc8a audit: Replace ch... |
554 555 556 |
/* Racing with audit_tree_freeing_mark()? */ if (!mark) continue; |
8432c7006 audit: Simplify l... |
557 558 |
fsnotify_get_mark(mark); spin_unlock(&hash_lock); |
74c3cbe33 [PATCH] audit: wa... |
559 |
|
8432c7006 audit: Simplify l... |
560 561 |
untag_chunk(chunk, mark); fsnotify_put_mark(mark); |
74c3cbe33 [PATCH] audit: wa... |
562 |
|
8432c7006 audit: Simplify l... |
563 |
spin_lock(&hash_lock); |
74c3cbe33 [PATCH] audit: wa... |
564 565 566 567 |
} spin_unlock(&hash_lock); put_tree(victim); } |
8432c7006 audit: Simplify l... |
568 569 570 571 572 573 574 |
/* * finish killing struct audit_tree */ static void prune_one(struct audit_tree *victim) { prune_tree_chunks(victim, false); } |
74c3cbe33 [PATCH] audit: wa... |
575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 |
/* trim the uncommitted chunks from tree */ static void trim_marked(struct audit_tree *tree) { struct list_head *p, *q; spin_lock(&hash_lock); if (tree->goner) { spin_unlock(&hash_lock); return; } /* reorder */ for (p = tree->chunks.next; p != &tree->chunks; p = q) { struct node *node = list_entry(p, struct node, list); q = p->next; if (node->index & (1U<<31)) { list_del_init(p); list_add(p, &tree->chunks); } } |
8432c7006 audit: Simplify l... |
594 |
spin_unlock(&hash_lock); |
74c3cbe33 [PATCH] audit: wa... |
595 |
|
8432c7006 audit: Simplify l... |
596 |
prune_tree_chunks(tree, true); |
74c3cbe33 [PATCH] audit: wa... |
597 |
|
8432c7006 audit: Simplify l... |
598 |
spin_lock(&hash_lock); |
74c3cbe33 [PATCH] audit: wa... |
599 600 601 602 |
if (!tree->root && !tree->goner) { tree->goner = 1; spin_unlock(&hash_lock); mutex_lock(&audit_filter_mutex); |
9e36a5d49 audit: hand taken... |
603 |
kill_rules(audit_context(), tree); |
74c3cbe33 [PATCH] audit: wa... |
604 605 606 607 608 609 610 |
list_del_init(&tree->list); mutex_unlock(&audit_filter_mutex); prune_one(tree); } else { spin_unlock(&hash_lock); } } |
916d75761 Fix rule eviction... |
611 |
static void audit_schedule_prune(void); |
74c3cbe33 [PATCH] audit: wa... |
612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 |
/* called with audit_filter_mutex */ int audit_remove_tree_rule(struct audit_krule *rule) { struct audit_tree *tree; tree = rule->tree; if (tree) { spin_lock(&hash_lock); list_del_init(&rule->rlist); if (list_empty(&tree->rules) && !tree->goner) { tree->root = NULL; list_del_init(&tree->same_root); tree->goner = 1; list_move(&tree->list, &prune_list); rule->tree = NULL; spin_unlock(&hash_lock); audit_schedule_prune(); return 1; } rule->tree = NULL; spin_unlock(&hash_lock); return 1; } return 0; } |
1f707137b new helper: itera... |
636 637 |
static int compare_root(struct vfsmount *mnt, void *arg) { |
f410ff655 audit: Abstract h... |
638 639 |
return inode_to_key(d_backing_inode(mnt->mnt_root)) == (unsigned long)arg; |
1f707137b new helper: itera... |
640 |
} |
74c3cbe33 [PATCH] audit: wa... |
641 642 643 644 645 646 647 648 |
void audit_trim_trees(void) { struct list_head cursor; mutex_lock(&audit_filter_mutex); list_add(&cursor, &tree_list); while (cursor.next != &tree_list) { struct audit_tree *tree; |
98bc993f9 [PATCH] get rid o... |
649 |
struct path path; |
74c3cbe33 [PATCH] audit: wa... |
650 651 |
struct vfsmount *root_mnt; struct node *node; |
74c3cbe33 [PATCH] audit: wa... |
652 653 654 655 656 657 658 |
int err; tree = container_of(cursor.next, struct audit_tree, list); get_tree(tree); list_del(&cursor); list_add(&cursor, &tree->list); mutex_unlock(&audit_filter_mutex); |
98bc993f9 [PATCH] get rid o... |
659 |
err = kern_path(tree->pathname, 0, &path); |
74c3cbe33 [PATCH] audit: wa... |
660 661 |
if (err) goto skip_it; |
589ff870e Switch collect_mo... |
662 |
root_mnt = collect_mounts(&path); |
98bc993f9 [PATCH] get rid o... |
663 |
path_put(&path); |
be34d1a3b VFS: Make clone_m... |
664 |
if (IS_ERR(root_mnt)) |
74c3cbe33 [PATCH] audit: wa... |
665 |
goto skip_it; |
74c3cbe33 [PATCH] audit: wa... |
666 667 |
spin_lock(&hash_lock); list_for_each_entry(node, &tree->chunks, list) { |
28a3a7eb3 audit: reimplemen... |
668 |
struct audit_chunk *chunk = find_chunk(node); |
25985edce Fix common misspe... |
669 |
/* this could be NULL if the watch is dying else where... */ |
74c3cbe33 [PATCH] audit: wa... |
670 |
node->index |= 1U<<31; |
f410ff655 audit: Abstract h... |
671 |
if (iterate_mounts(compare_root, |
8d20d6e93 audit: Embed key ... |
672 |
(void *)(chunk->key), |
f410ff655 audit: Abstract h... |
673 |
root_mnt)) |
1f707137b new helper: itera... |
674 |
node->index &= ~(1U<<31); |
74c3cbe33 [PATCH] audit: wa... |
675 676 677 |
} spin_unlock(&hash_lock); trim_marked(tree); |
74c3cbe33 [PATCH] audit: wa... |
678 679 |
drop_collected_mounts(root_mnt); skip_it: |
12b2f117f kernel/audit_tree... |
680 |
put_tree(tree); |
74c3cbe33 [PATCH] audit: wa... |
681 682 683 684 685 |
mutex_lock(&audit_filter_mutex); } list_del(&cursor); mutex_unlock(&audit_filter_mutex); } |
74c3cbe33 [PATCH] audit: wa... |
686 687 688 689 690 |
int audit_make_tree(struct audit_krule *rule, char *pathname, u32 op) { if (pathname[0] != '/' || rule->listnr != AUDIT_FILTER_EXIT || |
5af75d8d5 audit: validate c... |
691 |
op != Audit_equal || |
74c3cbe33 [PATCH] audit: wa... |
692 693 694 695 696 697 698 699 700 701 702 703 |
rule->inode_f || rule->watch || rule->tree) return -EINVAL; rule->tree = alloc_tree(pathname); if (!rule->tree) return -ENOMEM; return 0; } void audit_put_tree(struct audit_tree *tree) { put_tree(tree); } |
1f707137b new helper: itera... |
704 705 |
static int tag_mount(struct vfsmount *mnt, void *arg) { |
3b362157b VFS: audit: d_bac... |
706 |
return tag_chunk(d_backing_inode(mnt->mnt_root), arg); |
1f707137b new helper: itera... |
707 |
} |
f1aaf2622 audit: move the t... |
708 709 710 711 712 713 714 |
/* * That gets run when evict_chunk() ends up needing to kill audit_tree. * Runs from a separate thread. */ static int prune_tree_thread(void *unused) { for (;;) { |
0bf676d1f audit: cleanup pr... |
715 716 |
if (list_empty(&prune_list)) { set_current_state(TASK_INTERRUPTIBLE); |
f1aaf2622 audit: move the t... |
717 |
schedule(); |
0bf676d1f audit: cleanup pr... |
718 |
} |
f1aaf2622 audit: move the t... |
719 |
|
ce423631c audit: track the ... |
720 |
audit_ctl_lock(); |
f1aaf2622 audit: move the t... |
721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 |
mutex_lock(&audit_filter_mutex); while (!list_empty(&prune_list)) { struct audit_tree *victim; victim = list_entry(prune_list.next, struct audit_tree, list); list_del_init(&victim->list); mutex_unlock(&audit_filter_mutex); prune_one(victim); mutex_lock(&audit_filter_mutex); } mutex_unlock(&audit_filter_mutex); |
ce423631c audit: track the ... |
738 |
audit_ctl_unlock(); |
f1aaf2622 audit: move the t... |
739 740 741 742 743 744 745 746 |
} return 0; } static int audit_launch_prune(void) { if (prune_thread) return 0; |
0bf676d1f audit: cleanup pr... |
747 |
prune_thread = kthread_run(prune_tree_thread, NULL, |
f1aaf2622 audit: move the t... |
748 749 750 751 752 |
"audit_prune_tree"); if (IS_ERR(prune_thread)) { pr_err("cannot start thread audit_prune_tree"); prune_thread = NULL; return -ENOMEM; |
f1aaf2622 audit: move the t... |
753 |
} |
0bf676d1f audit: cleanup pr... |
754 |
return 0; |
f1aaf2622 audit: move the t... |
755 |
} |
74c3cbe33 [PATCH] audit: wa... |
756 757 758 759 |
/* called with audit_filter_mutex */ int audit_add_tree_rule(struct audit_krule *rule) { struct audit_tree *seed = rule->tree, *tree; |
98bc993f9 [PATCH] get rid o... |
760 |
struct path path; |
1f707137b new helper: itera... |
761 |
struct vfsmount *mnt; |
74c3cbe33 [PATCH] audit: wa... |
762 |
int err; |
736f3203a kernel/audit_tree... |
763 |
rule->tree = NULL; |
74c3cbe33 [PATCH] audit: wa... |
764 765 766 767 768 769 770 771 772 773 774 775 776 |
list_for_each_entry(tree, &tree_list, list) { if (!strcmp(seed->pathname, tree->pathname)) { put_tree(seed); rule->tree = tree; list_add(&rule->rlist, &tree->rules); return 0; } } tree = seed; list_add(&tree->list, &tree_list); list_add(&rule->rlist, &tree->rules); /* do not set rule->tree yet */ mutex_unlock(&audit_filter_mutex); |
f1aaf2622 audit: move the t... |
777 778 779 780 781 |
if (unlikely(!prune_thread)) { err = audit_launch_prune(); if (err) goto Err; } |
98bc993f9 [PATCH] get rid o... |
782 |
err = kern_path(tree->pathname, 0, &path); |
74c3cbe33 [PATCH] audit: wa... |
783 784 |
if (err) goto Err; |
589ff870e Switch collect_mo... |
785 |
mnt = collect_mounts(&path); |
98bc993f9 [PATCH] get rid o... |
786 |
path_put(&path); |
be34d1a3b VFS: Make clone_m... |
787 788 |
if (IS_ERR(mnt)) { err = PTR_ERR(mnt); |
74c3cbe33 [PATCH] audit: wa... |
789 790 |
goto Err; } |
74c3cbe33 [PATCH] audit: wa... |
791 792 |
get_tree(tree); |
1f707137b new helper: itera... |
793 |
err = iterate_mounts(tag_mount, tree, mnt); |
74c3cbe33 [PATCH] audit: wa... |
794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 |
drop_collected_mounts(mnt); if (!err) { struct node *node; spin_lock(&hash_lock); list_for_each_entry(node, &tree->chunks, list) node->index &= ~(1U<<31); spin_unlock(&hash_lock); } else { trim_marked(tree); goto Err; } mutex_lock(&audit_filter_mutex); if (list_empty(&rule->rlist)) { put_tree(tree); return -ENOENT; } rule->tree = tree; put_tree(tree); return 0; Err: mutex_lock(&audit_filter_mutex); list_del_init(&tree->list); list_del_init(&tree->rules); put_tree(tree); return err; } int audit_tag_tree(char *old, char *new) { struct list_head cursor, barrier; int failed = 0; |
2096f759a New helper: path_... |
828 |
struct path path1, path2; |
74c3cbe33 [PATCH] audit: wa... |
829 |
struct vfsmount *tagged; |
74c3cbe33 [PATCH] audit: wa... |
830 |
int err; |
2096f759a New helper: path_... |
831 |
err = kern_path(new, 0, &path2); |
74c3cbe33 [PATCH] audit: wa... |
832 833 |
if (err) return err; |
2096f759a New helper: path_... |
834 835 |
tagged = collect_mounts(&path2); path_put(&path2); |
be34d1a3b VFS: Make clone_m... |
836 837 |
if (IS_ERR(tagged)) return PTR_ERR(tagged); |
74c3cbe33 [PATCH] audit: wa... |
838 |
|
2096f759a New helper: path_... |
839 |
err = kern_path(old, 0, &path1); |
74c3cbe33 [PATCH] audit: wa... |
840 841 842 843 |
if (err) { drop_collected_mounts(tagged); return err; } |
74c3cbe33 [PATCH] audit: wa... |
844 |
|
74c3cbe33 [PATCH] audit: wa... |
845 846 847 848 849 850 |
mutex_lock(&audit_filter_mutex); list_add(&barrier, &tree_list); list_add(&cursor, &barrier); while (cursor.next != &tree_list) { struct audit_tree *tree; |
2096f759a New helper: path_... |
851 |
int good_one = 0; |
74c3cbe33 [PATCH] audit: wa... |
852 853 854 855 856 857 |
tree = container_of(cursor.next, struct audit_tree, list); get_tree(tree); list_del(&cursor); list_add(&cursor, &tree->list); mutex_unlock(&audit_filter_mutex); |
2096f759a New helper: path_... |
858 859 860 861 |
err = kern_path(tree->pathname, 0, &path2); if (!err) { good_one = path_is_under(&path1, &path2); path_put(&path2); |
74c3cbe33 [PATCH] audit: wa... |
862 |
} |
2096f759a New helper: path_... |
863 |
if (!good_one) { |
74c3cbe33 [PATCH] audit: wa... |
864 865 866 867 |
put_tree(tree); mutex_lock(&audit_filter_mutex); continue; } |
74c3cbe33 [PATCH] audit: wa... |
868 |
|
1f707137b new helper: itera... |
869 |
failed = iterate_mounts(tag_mount, tree, tagged); |
74c3cbe33 [PATCH] audit: wa... |
870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 |
if (failed) { put_tree(tree); mutex_lock(&audit_filter_mutex); break; } mutex_lock(&audit_filter_mutex); spin_lock(&hash_lock); if (!tree->goner) { list_del(&tree->list); list_add(&tree->list, &tree_list); } spin_unlock(&hash_lock); put_tree(tree); } while (barrier.prev != &tree_list) { struct audit_tree *tree; tree = container_of(barrier.prev, struct audit_tree, list); get_tree(tree); list_del(&tree->list); list_add(&tree->list, &barrier); mutex_unlock(&audit_filter_mutex); if (!failed) { struct node *node; spin_lock(&hash_lock); list_for_each_entry(node, &tree->chunks, list) node->index &= ~(1U<<31); spin_unlock(&hash_lock); } else { trim_marked(tree); } put_tree(tree); mutex_lock(&audit_filter_mutex); } list_del(&barrier); list_del(&cursor); |
74c3cbe33 [PATCH] audit: wa... |
910 |
mutex_unlock(&audit_filter_mutex); |
2096f759a New helper: path_... |
911 |
path_put(&path1); |
74c3cbe33 [PATCH] audit: wa... |
912 913 914 |
drop_collected_mounts(tagged); return failed; } |
916d75761 Fix rule eviction... |
915 916 917 |
static void audit_schedule_prune(void) { |
f1aaf2622 audit: move the t... |
918 |
wake_up_process(prune_thread); |
916d75761 Fix rule eviction... |
919 920 921 922 923 924 |
} /* * ... and that one is done if evict_chunk() decides to delay until the end * of syscall. Runs synchronously. */ |
9e36a5d49 audit: hand taken... |
925 |
void audit_kill_trees(struct audit_context *context) |
916d75761 Fix rule eviction... |
926 |
{ |
9e36a5d49 audit: hand taken... |
927 |
struct list_head *list = &context->killed_trees; |
ce423631c audit: track the ... |
928 |
audit_ctl_lock(); |
916d75761 Fix rule eviction... |
929 930 931 932 933 934 |
mutex_lock(&audit_filter_mutex); while (!list_empty(list)) { struct audit_tree *victim; victim = list_entry(list->next, struct audit_tree, list); |
9e36a5d49 audit: hand taken... |
935 |
kill_rules(context, victim); |
916d75761 Fix rule eviction... |
936 937 938 939 940 941 942 943 944 945 |
list_del_init(&victim->list); mutex_unlock(&audit_filter_mutex); prune_one(victim); mutex_lock(&audit_filter_mutex); } mutex_unlock(&audit_filter_mutex); |
ce423631c audit: track the ... |
946 |
audit_ctl_unlock(); |
74c3cbe33 [PATCH] audit: wa... |
947 948 949 950 951 |
} /* * Here comes the stuff asynchronous to auditctl operations */ |
74c3cbe33 [PATCH] audit: wa... |
952 953 954 |
static void evict_chunk(struct audit_chunk *chunk) { struct audit_tree *owner; |
916d75761 Fix rule eviction... |
955 956 |
struct list_head *postponed = audit_killed_trees(); int need_prune = 0; |
74c3cbe33 [PATCH] audit: wa... |
957 |
int n; |
74c3cbe33 [PATCH] audit: wa... |
958 959 960 961 962 963 964 965 966 |
mutex_lock(&audit_filter_mutex); spin_lock(&hash_lock); while (!list_empty(&chunk->trees)) { owner = list_entry(chunk->trees.next, struct audit_tree, same_root); owner->goner = 1; owner->root = NULL; list_del_init(&owner->same_root); spin_unlock(&hash_lock); |
916d75761 Fix rule eviction... |
967 |
if (!postponed) { |
9e36a5d49 audit: hand taken... |
968 |
kill_rules(audit_context(), owner); |
916d75761 Fix rule eviction... |
969 970 971 972 973 |
list_move(&owner->list, &prune_list); need_prune = 1; } else { list_move(&owner->list, postponed); } |
74c3cbe33 [PATCH] audit: wa... |
974 975 976 977 978 979 |
spin_lock(&hash_lock); } list_del_rcu(&chunk->hash); for (n = 0; n < chunk->count; n++) list_del_init(&chunk->owners[n].list); spin_unlock(&hash_lock); |
f1aaf2622 audit: move the t... |
980 |
mutex_unlock(&audit_filter_mutex); |
916d75761 Fix rule eviction... |
981 982 |
if (need_prune) audit_schedule_prune(); |
74c3cbe33 [PATCH] audit: wa... |
983 |
} |
3a9b16b40 fsnotify: send fs... |
984 |
static int audit_tree_handle_event(struct fsnotify_group *group, |
7053aee26 fsnotify: do not ... |
985 |
struct inode *to_tell, |
3cd5eca8d fsnotify: constif... |
986 |
u32 mask, const void *data, int data_type, |
e43e9c339 fsnotify: switch ... |
987 |
const struct qstr *file_name, u32 cookie, |
9385a84d7 fsnotify: Pass fs... |
988 |
struct fsnotify_iter_info *iter_info) |
74c3cbe33 [PATCH] audit: wa... |
989 |
{ |
83c4c4b0a fsnotify: remove ... |
990 |
return 0; |
28a3a7eb3 audit: reimplemen... |
991 |
} |
74c3cbe33 [PATCH] audit: wa... |
992 |
|
f905c2fc3 audit: Use 'mark'... |
993 994 |
static void audit_tree_freeing_mark(struct fsnotify_mark *mark, struct fsnotify_group *group) |
28a3a7eb3 audit: reimplemen... |
995 |
{ |
83d23bc8a audit: Replace ch... |
996 |
struct audit_chunk *chunk; |
28a3a7eb3 audit: reimplemen... |
997 |
|
f905c2fc3 audit: Use 'mark'... |
998 |
mutex_lock(&mark->group->mark_mutex); |
83d23bc8a audit: Replace ch... |
999 |
spin_lock(&hash_lock); |
f905c2fc3 audit: Use 'mark'... |
1000 1001 |
chunk = mark_chunk(mark); replace_mark_chunk(mark, NULL); |
83d23bc8a audit: Replace ch... |
1002 |
spin_unlock(&hash_lock); |
f905c2fc3 audit: Use 'mark'... |
1003 |
mutex_unlock(&mark->group->mark_mutex); |
83d23bc8a audit: Replace ch... |
1004 1005 1006 1007 |
if (chunk) { evict_chunk(chunk); audit_mark_put_chunk(chunk); } |
b3e8692b4 audit: clean up r... |
1008 1009 1010 1011 1012 |
/* * We are guaranteed to have at least one reference to the mark from * either the inode or the caller of fsnotify_destroy_mark(). */ |
f905c2fc3 audit: Use 'mark'... |
1013 |
BUG_ON(refcount_read(&mark->refcnt) < 1); |
74c3cbe33 [PATCH] audit: wa... |
1014 |
} |
28a3a7eb3 audit: reimplemen... |
1015 1016 |
static const struct fsnotify_ops audit_tree_ops = { .handle_event = audit_tree_handle_event, |
28a3a7eb3 audit: reimplemen... |
1017 |
.freeing_mark = audit_tree_freeing_mark, |
054c636e5 fsnotify: Move ->... |
1018 |
.free_mark = audit_tree_destroy_watch, |
74c3cbe33 [PATCH] audit: wa... |
1019 1020 1021 1022 1023 |
}; static int __init audit_tree_init(void) { int i; |
5f5161300 audit: Allocate f... |
1024 |
audit_tree_mark_cachep = KMEM_CACHE(audit_tree_mark, SLAB_PANIC); |
0d2e2a1d0 fsnotify: drop ma... |
1025 |
audit_tree_group = fsnotify_alloc_group(&audit_tree_ops); |
28a3a7eb3 audit: reimplemen... |
1026 1027 |
if (IS_ERR(audit_tree_group)) audit_panic("cannot initialize fsnotify group for rectree watches"); |
74c3cbe33 [PATCH] audit: wa... |
1028 1029 1030 1031 1032 1033 1034 |
for (i = 0; i < HASH_SIZE; i++) INIT_LIST_HEAD(&chunk_hash_heads[i]); return 0; } __initcall(audit_tree_init); |