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author | Jan Kara <jack@suse.cz> | 2018-11-12 15:54:48 +0100 |
---|---|---|
committer | Paul Moore <paul@paul-moore.com> | 2018-11-12 15:54:48 +0100 |
commit | 1635e5722350597b6a149bdb131358fcd7e34906 (patch) | |
tree | 216c24efdcd39602c92b7419d522c519bc3486e8 /kernel/audit_tree.c | |
parent | audit: Embed key into chunk (diff) | |
download | linux-1635e5722350597b6a149bdb131358fcd7e34906.tar.xz linux-1635e5722350597b6a149bdb131358fcd7e34906.zip |
audit: Make hash table insertion safe against concurrent lookups
Currently, the audit tree code does not make sure that when a chunk is
inserted into the hash table, it is fully initialized. So in theory a
user of RCU lookup could see uninitialized structure in the hash table
and crash. Add appropriate barriers between initialization of the
structure and its insertion into hash table.
Reviewed-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'kernel/audit_tree.c')
-rw-r--r-- | kernel/audit_tree.c | 32 |
1 files changed, 29 insertions, 3 deletions
diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c index bac5dd90c629..307749d6773c 100644 --- a/kernel/audit_tree.c +++ b/kernel/audit_tree.c @@ -186,6 +186,12 @@ static void insert_hash(struct audit_chunk *chunk) if (!(chunk->mark.flags & FSNOTIFY_MARK_FLAG_ATTACHED)) return; + /* + * 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(); WARN_ON_ONCE(!chunk->key); list = chunk_hash(chunk->key); list_add_rcu(&chunk->hash, list); @@ -199,7 +205,11 @@ struct audit_chunk *audit_tree_lookup(const struct inode *inode) struct audit_chunk *p; list_for_each_entry_rcu(p, list, hash) { - if (p->key == key) { + /* + * 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) { atomic_long_inc(&p->refs); return p; } @@ -304,9 +314,15 @@ static void untag_chunk(struct node *p) list_replace_init(&chunk->owners[j].list, &new->owners[i].list); } - list_replace_rcu(&chunk->hash, &new->hash); list_for_each_entry(owner, &new->trees, same_root) owner->root = new; + /* + * 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(&chunk->hash, &new->hash); spin_unlock(&hash_lock); fsnotify_detach_mark(entry); mutex_unlock(&entry->group->mark_mutex); @@ -368,6 +384,10 @@ static int create_chunk(struct inode *inode, struct audit_tree *tree) list_add(&tree->same_root, &chunk->trees); } chunk->key = inode_to_key(inode); + /* + * Inserting into the hash table has to go last as once we do that RCU + * readers can see the chunk. + */ insert_hash(chunk); spin_unlock(&hash_lock); mutex_unlock(&audit_tree_group->mark_mutex); @@ -459,7 +479,6 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree) p->owner = tree; get_tree(tree); list_add(&p->list, &tree->chunks); - list_replace_rcu(&old->hash, &chunk->hash); list_for_each_entry(owner, &chunk->trees, same_root) owner->root = chunk; old->dead = 1; @@ -467,6 +486,13 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree) tree->root = chunk; list_add(&tree->same_root, &chunk->trees); } + /* + * 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, &chunk->hash); spin_unlock(&hash_lock); fsnotify_detach_mark(old_entry); mutex_unlock(&audit_tree_group->mark_mutex); |