[PATCH] fix missed create event for directory audit

When an object is created via a symlink into an audited directory, audit misses
the event due to not having collected the inode data for the directory.  Modify
__audit_inode_child() to copy the parent inode data if a parent wasn't found in
audit_names[].

Signed-off-by: Amy Griffis <amy.griffis@hp.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

4 files changed, 21 insertions, 11 deletions

diff --git a/fs/namei.c b/fs/namei.c
index 47a7bad92d2a..0ab26cbdacc0 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1357,7 +1357,7 @@ static int may_delete(struct inode *dir,struct dentry *victim,int isdir)
                 return -ENOENT;
 
         BUG_ON(victim->d_parent->d_inode != dir);
-        audit_inode_child(victim->d_name.name, victim->d_inode, dir->i_ino);
+        audit_inode_child(victim->d_name.name, victim->d_inode, dir);
 
         error = permission(dir,MAY_WRITE | MAY_EXEC, NULL);
         if (error)
diff --git a/include/linux/audit.h b/include/linux/audit.h
index e7e5e5348987..bf196c05826c 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -327,7 +327,7 @@ extern void __audit_getname(const char *name);
 extern void audit_putname(const char *name);
 extern void __audit_inode(const char *name, const struct inode *inode);
 extern void __audit_inode_child(const char *dname, const struct inode *inode,
-                                unsigned long pino);
+                                const struct inode *parent);
 extern void __audit_inode_update(const struct inode *inode);
 static inline void audit_getname(const char *name)
 {
@@ -339,10 +339,10 @@ static inline void audit_inode(const char *name, const struct inode *inode) {
                 __audit_inode(name, inode);
 }
 static inline void audit_inode_child(const char *dname, 
-                                     const struct inode *inode, 
-                                     unsigned long pino) {
+                                     const struct inode *inode,
+                                     const struct inode *parent) {
         if (unlikely(current->audit_context))
-                __audit_inode_child(dname, inode, pino);
+                __audit_inode_child(dname, inode, parent);
 }
 static inline void audit_inode_update(const struct inode *inode) {
         if (unlikely(current->audit_context))
diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h
index cc5dec70c32c..d4f219ffaa5d 100644
--- a/include/linux/fsnotify.h
+++ b/include/linux/fsnotify.h
@@ -67,7 +67,7 @@ static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
         if (source) {
                 inotify_inode_queue_event(source, IN_MOVE_SELF, 0, NULL, NULL);
         }
-        audit_inode_child(new_name, source, new_dir->i_ino);
+        audit_inode_child(new_name, source, new_dir);
 }
 
 /*
@@ -98,7 +98,7 @@ static inline void fsnotify_create(struct inode *inode, struct dentry *dentry)
         inode_dir_notify(inode, DN_CREATE);
         inotify_inode_queue_event(inode, IN_CREATE, 0, dentry->d_name.name,
                                   dentry->d_inode);
-        audit_inode_child(dentry->d_name.name, dentry->d_inode, inode->i_ino);
+        audit_inode_child(dentry->d_name.name, dentry->d_inode, inode);
 }
 
 /*
@@ -109,7 +109,7 @@ static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry)
         inode_dir_notify(inode, DN_CREATE);
         inotify_inode_queue_event(inode, IN_CREATE | IN_ISDIR, 0, 
                                   dentry->d_name.name, dentry->d_inode);
-        audit_inode_child(dentry->d_name.name, dentry->d_inode, inode->i_ino);
+        audit_inode_child(dentry->d_name.name, dentry->d_inode, inode);
 }
 
 /*
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index b939ed2da3ee..b1356fc63b26 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1251,7 +1251,7 @@ void __audit_inode(const char *name, const struct inode *inode)
  * audit_inode_child - collect inode info for created/removed objects
  * @dname: inode's dentry name
  * @inode: inode being audited
- * @pino: inode number of dentry parent
+ * @parent: inode of dentry parent
  *
  * For syscalls that create or remove filesystem objects, audit_inode
  * can only collect information for the filesystem object's parent.
@@ -1262,7 +1262,7 @@ void __audit_inode(const char *name, const struct inode *inode)
  * unsuccessful attempts.
  */
 void __audit_inode_child(const char *dname, const struct inode *inode,
-                         unsigned long pino)
+                         const struct inode *parent)
 {
         int idx;
         struct audit_context *context = current->audit_context;
@@ -1276,7 +1276,7 @@ void __audit_inode_child(const char *dname, const struct inode *inode,
         if (!dname)
                 goto update_context;
         for (idx = 0; idx < context->name_count; idx++)
-                if (context->names[idx].ino == pino) {
+                if (context->names[idx].ino == parent->i_ino) {
                         const char *name = context->names[idx].name;
 
                         if (!name)
@@ -1304,6 +1304,16 @@ update_context:
                 context->names[idx].ino = (unsigned long)-1;
         else
                 audit_copy_inode(&context->names[idx], inode);
+
+        /* A parent was not found in audit_names, so copy the inode data for the
+         * provided parent. */
+        if (!found_name) {
+                idx = context->name_count++;
+#if AUDIT_DEBUG
+                context->ino_count++;
+#endif
+                audit_copy_inode(&context->names[idx], parent);
+        }
 }
 
 /**