audit: overhaul __audit_inode_child to accomodate retrying

In order to accomodate retrying path-based syscalls, we need to add a
new "type" argument to audit_inode_child. This will tell us whether
we're looking for a child entry that represents a create or a delete.

If we find a parent, don't automatically assume that we need to create a
new entry. Instead, use the information we have to try to find an
existing entry first. Update it if one is found and create a new one if
not.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

2 files changed, 15 insertions, 9 deletions

diff --git a/include/linux/audit.h b/include/linux/audit.h
index b11f517dce04..3df643d1ac5b 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -457,6 +457,8 @@ extern int audit_classify_arch(int arch);
 #define	AUDIT_TYPE_UNKNOWN	0	/* we don't know yet */
 #define	AUDIT_TYPE_NORMAL	1	/* a "normal" audit record */
 #define	AUDIT_TYPE_PARENT	2	/* a parent audit record */
+#define	AUDIT_TYPE_CHILD_DELETE 3	/* a child being deleted */
+#define	AUDIT_TYPE_CHILD_CREATE 4	/* a child being created */
 
 #ifdef CONFIG_AUDITSYSCALL
 /* These are defined in auditsc.c */
@@ -472,7 +474,8 @@ extern void audit_putname(const char *name);
 extern void __audit_inode(const char *name, const struct dentry *dentry,
 				unsigned int parent);
 extern void __audit_inode_child(const struct inode *parent,
-				const struct dentry *dentry);
+				const struct dentry *dentry,
+				const unsigned char type);
 extern void __audit_seccomp(unsigned long syscall, long signr, int code);
 extern void __audit_ptrace(struct task_struct *t);
 
@@ -513,9 +516,10 @@ static inline void audit_inode(const char *name, const struct dentry *dentry,
 		__audit_inode(name, dentry, parent);
 }
 static inline void audit_inode_child(const struct inode *parent,
-				     const struct dentry *dentry) {
+				     const struct dentry *dentry,
+				     const unsigned char type) {
 	if (unlikely(!audit_dummy_context()))
-		__audit_inode_child(parent, dentry);
+		__audit_inode_child(parent, dentry, type);
 }
 void audit_core_dumps(long signr);
 
@@ -667,13 +671,15 @@ static inline void __audit_inode(const char *name, const struct dentry *dentry,
 					unsigned int parent)
 { }
 static inline void __audit_inode_child(const struct inode *parent,
-					const struct dentry *dentry)
+					const struct dentry *dentry,
+					const unsigned char type)
 { }
 static inline void audit_inode(const char *name, const struct dentry *dentry,
 				unsigned int parent)
 { }
 static inline void audit_inode_child(const struct inode *parent,
-				     const struct dentry *dentry)
+				     const struct dentry *dentry,
+				     const unsigned char type)
 { }
 static inline void audit_core_dumps(long signr)
 { }
diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h
index 9c284714977d..0fbfb4646d1b 100644
--- a/include/linux/fsnotify.h
+++ b/include/linux/fsnotify.h
@@ -109,7 +109,7 @@ static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
 
 	if (source)
 		fsnotify(source, FS_MOVE_SELF, moved->d_inode, FSNOTIFY_EVENT_INODE, NULL, 0);
-	audit_inode_child(new_dir, moved);
+	audit_inode_child(new_dir, moved, AUDIT_TYPE_CHILD_CREATE);
 }
 
 /*
@@ -155,7 +155,7 @@ static inline void fsnotify_inoderemove(struct inode *inode)
  */
 static inline void fsnotify_create(struct inode *inode, struct dentry *dentry)
 {
-	audit_inode_child(inode, dentry);
+	audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE);
 
 	fsnotify(inode, FS_CREATE, dentry->d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0);
 }
@@ -168,7 +168,7 @@ static inline void fsnotify_create(struct inode *inode, struct dentry *dentry)
 static inline void fsnotify_link(struct inode *dir, struct inode *inode, struct dentry *new_dentry)
 {
 	fsnotify_link_count(inode);
-	audit_inode_child(dir, new_dentry);
+	audit_inode_child(dir, new_dentry, AUDIT_TYPE_CHILD_CREATE);
 
 	fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE, new_dentry->d_name.name, 0);
 }
@@ -181,7 +181,7 @@ static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry)
 	__u32 mask = (FS_CREATE | FS_ISDIR);
 	struct inode *d_inode = dentry->d_inode;
 
-	audit_inode_child(inode, dentry);
+	audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE);
 
 	fsnotify(inode, mask, d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0);
 }