ima_fs: don't bother with removal of files in directory we'll be removing

removal of parent takes all children out

Acked-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Author: Al Viro

security/integrity/ima/ima_fs.c

@@ -396,11 +396,6 @@ static ssize_t ima_write_policy(struct file *file, const char __user *buf,
 
 static struct dentry *ima_dir;
 static struct dentry *ima_symlink;
-static struct dentry *binary_runtime_measurements;
-static struct dentry *ascii_runtime_measurements;
-static struct dentry *runtime_measurements_count;
-static struct dentry *violations;
-static struct dentry *ima_policy;
 
 enum ima_fs_flags {
 	IMA_FS_BUSY,
@@ -419,14 +414,7 @@ static const struct seq_operations ima_policy_seqops = {
 
 static void __init remove_securityfs_measurement_lists(struct dentry **lists)
 {
-	int i;
-
-	if (lists) {
-		for (i = 0; i < securityfs_measurement_list_count; i++)
-			securityfs_remove(lists[i]);
-
-		kfree(lists);
-	}
+	kfree(lists);
 }
 
 static int __init create_securityfs_measurement_lists(void)
@@ -533,8 +521,7 @@ static int ima_release_policy(struct inode *inode, struct file *file)
 
 	ima_update_policy();
 #if !defined(CONFIG_IMA_WRITE_POLICY) && !defined(CONFIG_IMA_READ_POLICY)
-	securityfs_remove(ima_policy);
-	ima_policy = NULL;
+	securityfs_remove(file->f_path.dentry);
 #elif defined(CONFIG_IMA_WRITE_POLICY)
 	clear_bit(IMA_FS_BUSY, &ima_fs_flags);
 #elif defined(CONFIG_IMA_READ_POLICY)
@@ -553,6 +540,7 @@ static const struct file_operations ima_measure_policy_ops = {
 
 int __init ima_fs_init(void)
 {
+	struct dentry *dentry;
 	int ret;
 
 	ascii_securityfs_measurement_lists = NULL;
@@ -573,54 +561,45 @@ int __init ima_fs_init(void)
 	if (ret != 0)
 		goto out;
 
-	binary_runtime_measurements =
-	    securityfs_create_symlink("binary_runtime_measurements", ima_dir,
+	dentry = securityfs_create_symlink("binary_runtime_measurements", ima_dir,
 				      "binary_runtime_measurements_sha1", NULL);
-	if (IS_ERR(binary_runtime_measurements)) {
-		ret = PTR_ERR(binary_runtime_measurements);
+	if (IS_ERR(dentry)) {
+		ret = PTR_ERR(dentry);
 		goto out;
 	}
 
-	ascii_runtime_measurements =
-	    securityfs_create_symlink("ascii_runtime_measurements", ima_dir,
+	dentry = securityfs_create_symlink("ascii_runtime_measurements", ima_dir,
 				      "ascii_runtime_measurements_sha1", NULL);
-	if (IS_ERR(ascii_runtime_measurements)) {
-		ret = PTR_ERR(ascii_runtime_measurements);
+	if (IS_ERR(dentry)) {
+		ret = PTR_ERR(dentry);
 		goto out;
 	}
 
-	runtime_measurements_count =
-	    securityfs_create_file("runtime_measurements_count",
+	dentry = securityfs_create_file("runtime_measurements_count",
 				   S_IRUSR | S_IRGRP, ima_dir, NULL,
 				   &ima_measurements_count_ops);
-	if (IS_ERR(runtime_measurements_count)) {
-		ret = PTR_ERR(runtime_measurements_count);
+	if (IS_ERR(dentry)) {
+		ret = PTR_ERR(dentry);
 		goto out;
 	}
 
-	violations =
-	    securityfs_create_file("violations", S_IRUSR | S_IRGRP,
+	dentry = securityfs_create_file("violations", S_IRUSR | S_IRGRP,
 				   ima_dir, NULL, &ima_htable_violations_ops);
-	if (IS_ERR(violations)) {
-		ret = PTR_ERR(violations);
+	if (IS_ERR(dentry)) {
+		ret = PTR_ERR(dentry);
 		goto out;
 	}
 
-	ima_policy = securityfs_create_file("policy", POLICY_FILE_FLAGS,
+	dentry = securityfs_create_file("policy", POLICY_FILE_FLAGS,
 					    ima_dir, NULL,
 					    &ima_measure_policy_ops);
-	if (IS_ERR(ima_policy)) {
-		ret = PTR_ERR(ima_policy);
+	if (IS_ERR(dentry)) {
+		ret = PTR_ERR(dentry);
 		goto out;
 	}
 
 	return 0;
 out:
-	securityfs_remove(ima_policy);
-	securityfs_remove(violations);
-	securityfs_remove(runtime_measurements_count);
-	securityfs_remove(ascii_runtime_measurements);
-	securityfs_remove(binary_runtime_measurements);
 	remove_securityfs_measurement_lists(ascii_securityfs_measurement_lists);
 	remove_securityfs_measurement_lists(binary_securityfs_measurement_lists);
 	securityfs_measurement_list_count = 0;