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authorNick Piggin <npiggin@kernel.dk>2011-01-07 17:49:16 +1100
committerNick Piggin <npiggin@kernel.dk>2011-01-07 17:50:16 +1100
commit786a5e15b613a9cee4fc9139fc3113a5ab0fde79 (patch)
tree0c0100945f74ad1d68b9b546e1929cfcb67e9095
parentd3a23e1678a5827c38ed8a465ad91d65e59fa911 (diff)
downloadop-kernel-dev-786a5e15b613a9cee4fc9139fc3113a5ab0fde79.zip
op-kernel-dev-786a5e15b613a9cee4fc9139fc3113a5ab0fde79.tar.gz
fs: d_validate fixes
d_validate has been broken for a long time. kmem_ptr_validate does not guarantee that a pointer can be dereferenced if it can go away at any time. Even rcu_read_lock doesn't help, because the pointer might be queued in RCU callbacks but not executed yet. So the parent cannot be checked, nor the name hashed. The dentry pointer can not be touched until it can be verified under lock. Hashing simply cannot be used. Instead, verify the parent/child relationship by traversing parent's d_child list. It's slow, but only ncpfs and the destaged smbfs care about it, at this point. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
-rw-r--r--fs/dcache.c25
1 files changed, 7 insertions, 18 deletions
diff --git a/fs/dcache.c b/fs/dcache.c
index cc2b938..9d1a59df 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1483,41 +1483,30 @@ out:
}
/**
- * d_validate - verify dentry provided from insecure source
+ * d_validate - verify dentry provided from insecure source (deprecated)
* @dentry: The dentry alleged to be valid child of @dparent
* @dparent: The parent dentry (known to be valid)
*
* An insecure source has sent us a dentry, here we verify it and dget() it.
* This is used by ncpfs in its readdir implementation.
* Zero is returned in the dentry is invalid.
+ *
+ * This function is slow for big directories, and deprecated, do not use it.
*/
-
int d_validate(struct dentry *dentry, struct dentry *dparent)
{
- struct hlist_head *base;
- struct hlist_node *lhp;
-
- /* Check whether the ptr might be valid at all.. */
- if (!kmem_ptr_validate(dentry_cache, dentry))
- goto out;
-
- if (dentry->d_parent != dparent)
- goto out;
+ struct dentry *child;
spin_lock(&dcache_lock);
- base = d_hash(dparent, dentry->d_name.hash);
- hlist_for_each(lhp,base) {
- /* hlist_for_each_entry_rcu() not required for d_hash list
- * as it is parsed under dcache_lock
- */
- if (dentry == hlist_entry(lhp, struct dentry, d_hash)) {
+ list_for_each_entry(child, &dparent->d_subdirs, d_u.d_child) {
+ if (dentry == child) {
__dget_locked(dentry);
spin_unlock(&dcache_lock);
return 1;
}
}
spin_unlock(&dcache_lock);
-out:
+
return 0;
}
EXPORT_SYMBOL(d_validate);
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