[PATCH] fix faulty inode data collection for open() with O_CREAT

When the specified path is an existing file or when it is a symlink, audit
collects the wrong inode number, which causes it to miss the open() event.
Adding a second hook to the open() path fixes this.

Also add audit_copy_inode() to consolidate some code.

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

3 files changed, 50 insertions, 22 deletions

diff --git a/fs/namei.c b/fs/namei.c
index e01070d..47a7bad9 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1659,6 +1659,7 @@ do_last:
 	 * It already exists.
 	 */
 	mutex_unlock(&dir->d_inode->i_mutex);
+	audit_inode_update(path.dentry->d_inode);
 
 	error = -EEXIST;
 	if (flag & O_EXCL)
@@ -1669,6 +1670,7 @@ do_last:
 		if (flag & O_NOFOLLOW)
 			goto exit_dput;
 	}
+
 	error = -ENOENT;
 	if (!path.dentry->d_inode)
 		goto exit_dput;
diff --git a/include/linux/audit.h b/include/linux/audit.h
index b27d7de..e7e5e53 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -328,6 +328,7 @@ 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);
+extern void __audit_inode_update(const struct inode *inode);
 static inline void audit_getname(const char *name)
 {
 	if (unlikely(current->audit_context))
@@ -343,6 +344,10 @@ static inline void audit_inode_child(const char *dname,
 	if (unlikely(current->audit_context))
 		__audit_inode_child(dname, inode, pino);
 }
+static inline void audit_inode_update(const struct inode *inode) {
+	if (unlikely(current->audit_context))
+		__audit_inode_update(inode);
+}
 
 				/* Private API (for audit.c only) */
 extern unsigned int audit_serial(void);
@@ -414,8 +419,10 @@ static inline int audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
 #define audit_putname(n) do { ; } while (0)
 #define __audit_inode(n,i) do { ; } while (0)
 #define __audit_inode_child(d,i,p) do { ; } while (0)
+#define __audit_inode_update(i) do { ; } while (0)
 #define audit_inode(n,i) do { ; } while (0)
 #define audit_inode_child(d,i,p) do { ; } while (0)
+#define audit_inode_update(i) do { ; } while (0)
 #define auditsc_get_stamp(c,t,s) do { BUG(); } while (0)
 #define audit_get_loginuid(c) ({ -1; })
 #define audit_ipc_obj(i) ({ 0; })
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index ae40ac8..b939ed2 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1199,14 +1199,18 @@ void audit_putname(const char *name)
 #endif
 }
 
-static void audit_inode_context(int idx, const struct inode *inode)
+/* Copy inode data into an audit_names. */
+static void audit_copy_inode(struct audit_names *name, const struct inode *inode)
 {
-	struct audit_context *context = current->audit_context;
-
-	selinux_get_inode_sid(inode, &context->names[idx].osid);
+	name->ino   = inode->i_ino;
+	name->dev   = inode->i_sb->s_dev;
+	name->mode  = inode->i_mode;
+	name->uid   = inode->i_uid;
+	name->gid   = inode->i_gid;
+	name->rdev  = inode->i_rdev;
+	selinux_get_inode_sid(inode, &name->osid);
 }
 
-
 /**
  * audit_inode - store the inode and device from a lookup
  * @name: name being audited
@@ -1240,13 +1244,7 @@ void __audit_inode(const char *name, const struct inode *inode)
 		++context->ino_count;
 #endif
 	}
-	context->names[idx].ino   = inode->i_ino;
-	context->names[idx].dev	  = inode->i_sb->s_dev;
-	context->names[idx].mode  = inode->i_mode;
-	context->names[idx].uid   = inode->i_uid;
-	context->names[idx].gid   = inode->i_gid;
-	context->names[idx].rdev  = inode->i_rdev;
-	audit_inode_context(idx, inode);
+	audit_copy_inode(&context->names[idx], inode);
 }
 
 /**
@@ -1302,16 +1300,37 @@ update_context:
 	context->names[idx].name_len = AUDIT_NAME_FULL;
 	context->names[idx].name_put = 0;	/* don't call __putname() */
 
-	if (inode) {
-		context->names[idx].ino   = inode->i_ino;
-		context->names[idx].dev	  = inode->i_sb->s_dev;
-		context->names[idx].mode  = inode->i_mode;
-		context->names[idx].uid   = inode->i_uid;
-		context->names[idx].gid   = inode->i_gid;
-		context->names[idx].rdev  = inode->i_rdev;
-		audit_inode_context(idx, inode);
-	} else
-		context->names[idx].ino   = (unsigned long)-1;
+	if (!inode)
+		context->names[idx].ino = (unsigned long)-1;
+	else
+		audit_copy_inode(&context->names[idx], inode);
+}
+
+/**
+ * audit_inode_update - update inode info for last collected name
+ * @inode: inode being audited
+ *
+ * When open() is called on an existing object with the O_CREAT flag, the inode
+ * data audit initially collects is incorrect.  This additional hook ensures
+ * audit has the inode data for the actual object to be opened.
+ */
+void __audit_inode_update(const struct inode *inode)
+{
+	struct audit_context *context = current->audit_context;
+	int idx;
+
+	if (!context->in_syscall || !inode)
+		return;
+
+	if (context->name_count == 0) {
+		context->name_count++;
+#if AUDIT_DEBUG
+		context->ino_count++;
+#endif
+	}
+	idx = context->name_count - 1;
+
+	audit_copy_inode(&context->names[idx], inode);
 }
 
 /**