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Merge branch 'stable-4.10' of git://git.infradead.org/users/pcmoore/audit

Browse source 
Pull audit fixes from Paul Moore:
 "Two small fixes relating to audit's use of fsnotify.

  The first patch plugs a leak and the second fixes some lock
  shenanigans. The patches are small and I banged on this for an
  afternoon with our testsuite and didn't see anything odd"

* 'stable-4.10' of git://git.infradead.org/users/pcmoore/audit:
  audit: Fix sleep in atomic
  fsnotify: Remove fsnotify_duplicate_mark()
This commit is contained in:
Linus Torvalds 2017-01-05 23:06:06 -08:00
commit 6989606a72
3 changed files with 14 additions and 18 deletions
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12
fs/notify/mark.c
View file

@ -510,18 +510,6 @@ void fsnotify_detach_group_marks(struct fsnotify_group *group)
}
}
void fsnotify_duplicate_mark(struct fsnotify_mark *new, struct fsnotify_mark *old)
{
assert_spin_locked(&old->lock);
new->inode = old->inode;
new->mnt = old->mnt;
if (old->group)
fsnotify_get_group(old->group);
new->group = old->group;
new->mask = old->mask;
new->free_mark = old->free_mark;
}
/*
* Nothing fancy, just initialize lists and locks and counters.
*/

2
include/linux/fsnotify_backend.h
View file

@ -323,8 +323,6 @@ extern void fsnotify_init_mark(struct fsnotify_mark *mark, void (*free_mark)(str
extern struct fsnotify_mark *fsnotify_find_inode_mark(struct fsnotify_group *group, struct inode *inode);
/* find (and take a reference) to a mark associated with group and vfsmount */
extern struct fsnotify_mark *fsnotify_find_vfsmount_mark(struct fsnotify_group *group, struct vfsmount *mnt);
/* copy the values from old into new */
extern void fsnotify_duplicate_mark(struct fsnotify_mark *new, struct fsnotify_mark *old);
/* set the ignored_mask of a mark */
extern void fsnotify_set_mark_ignored_mask_locked(struct fsnotify_mark *mark, __u32 mask);
/* set the mask of a mark (might pin the object into memory */

18
kernel/audit_tree.c
View file

@ -231,9 +231,11 @@ static void untag_chunk(struct node *p)
if (size)
new = alloc_chunk(size);
mutex_lock(&entry->group->mark_mutex);
spin_lock(&entry->lock);
if (chunk->dead || !entry->inode) {
spin_unlock(&entry->lock);
mutex_unlock(&entry->group->mark_mutex);
if (new)
free_chunk(new);
goto out;
@ -251,6 +253,7 @@ static void untag_chunk(struct node *p)
list_del_rcu(&chunk->hash);
spin_unlock(&hash_lock);
spin_unlock(&entry->lock);
mutex_unlock(&entry->group->mark_mutex);
fsnotify_destroy_mark(entry, audit_tree_group);
goto out;
}
@ -258,8 +261,8 @@ static void untag_chunk(struct node *p)
if (!new)
goto Fallback;
fsnotify_duplicate_mark(&new->mark, entry);
if (fsnotify_add_mark(&new->mark, new->mark.group, new->mark.inode, NULL, 1)) {
if (fsnotify_add_mark_locked(&new->mark, entry->group, entry->inode,
NULL, 1)) {
fsnotify_put_mark(&new->mark);
goto Fallback;
}
@ -293,6 +296,7 @@ static void untag_chunk(struct node *p)
owner->root = new;
spin_unlock(&hash_lock);
spin_unlock(&entry->lock);
mutex_unlock(&entry->group->mark_mutex);
fsnotify_destroy_mark(entry, audit_tree_group);
fsnotify_put_mark(&new->mark); /* drop initial reference */
goto out;
@ -309,6 +313,7 @@ static void untag_chunk(struct node *p)
put_tree(owner);
spin_unlock(&hash_lock);
spin_unlock(&entry->lock);
mutex_unlock(&entry->group->mark_mutex);
out:
fsnotify_put_mark(entry);
spin_lock(&hash_lock);
@ -386,18 +391,21 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
chunk_entry = &chunk->mark;
mutex_lock(&old_entry->group->mark_mutex);
spin_lock(&old_entry->lock);
if (!old_entry->inode) {
/* old_entry is being shot, lets just lie */
spin_unlock(&old_entry->lock);
mutex_unlock(&old_entry->group->mark_mutex);
fsnotify_put_mark(old_entry);
free_chunk(chunk);
return -ENOENT;
}
fsnotify_duplicate_mark(chunk_entry, old_entry);
if (fsnotify_add_mark(chunk_entry, chunk_entry->group, chunk_entry->inode, NULL, 1)) {
if (fsnotify_add_mark_locked(chunk_entry, old_entry->group,
old_entry->inode, NULL, 1)) {
spin_unlock(&old_entry->lock);
mutex_unlock(&old_entry->group->mark_mutex);
fsnotify_put_mark(chunk_entry);
fsnotify_put_mark(old_entry);
return -ENOSPC;
@ -413,6 +421,7 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
chunk->dead = 1;
spin_unlock(&chunk_entry->lock);
spin_unlock(&old_entry->lock);
mutex_unlock(&old_entry->group->mark_mutex);
fsnotify_destroy_mark(chunk_entry, audit_tree_group);
@ -445,6 +454,7 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
spin_unlock(&hash_lock);
spin_unlock(&chunk_entry->lock);
spin_unlock(&old_entry->lock);
mutex_unlock(&old_entry->group->mark_mutex);
fsnotify_destroy_mark(old_entry, audit_tree_group);
fsnotify_put_mark(chunk_entry); /* drop initial reference */
fsnotify_put_mark(old_entry); /* pair to fsnotify_find mark_entry */