linux-kernel - [PATCH 5/8] efi_secret: clean securityfs use up

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Message-ID: <20250509044001.GP2023217@ZenIV>
Date: Fri, 9 May 2025 05:40:01 +0100
From: Al Viro <viro@...iv.linux.org.uk>
To: alexjlzheng@...il.com
Cc: paul@...l-moore.com, jmorris@...ei.org, serge@...lyn.com,
	greg@...ah.com, chrisw@...l.org,
	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jinliang Zheng <alexjlzheng@...cent.com>
Subject: [PATCH 5/8] efi_secret: clean securityfs use up

>From 3d85b8d99ead2537b8be972631a9c88e6814f18b Mon Sep 17 00:00:00 2001
From: Al Viro <viro@...iv.linux.org.uk>
Date: Tue, 14 May 2024 08:53:07 -0600
Subject: [PATCH 5/8] efi_secret: clean securityfs use up

securityfs_remove() does take care of entire subtree now; no need
to mess with them individually.

NB: ->i_op replacement in there is still buggy.  One shouldn't
ever modify ->i_op of live accessible inode.

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 drivers/virt/coco/efi_secret/efi_secret.c | 37 +++++------------------
 1 file changed, 8 insertions(+), 29 deletions(-)

diff --git a/drivers/virt/coco/efi_secret/efi_secret.c b/drivers/virt/coco/efi_secret/efi_secret.c
index f2da4819ec3b..5946c5abeae8 100644
--- a/drivers/virt/coco/efi_secret/efi_secret.c
+++ b/drivers/virt/coco/efi_secret/efi_secret.c
@@ -31,8 +31,6 @@
 
 struct efi_secret {
 	struct dentry *secrets_dir;
-	struct dentry *fs_dir;
-	struct dentry *fs_files[EFI_SECRET_NUM_FILES];
 	void __iomem *secret_data;
 	u64 secret_data_len;
 };
@@ -119,10 +117,8 @@ static void wipe_memory(void *addr, size_t size)
 
 static int efi_secret_unlink(struct inode *dir, struct dentry *dentry)
 {
-	struct efi_secret *s = efi_secret_get();
 	struct inode *inode = d_inode(dentry);
 	struct secret_entry *e = (struct secret_entry *)inode->i_private;
-	int i;
 
 	if (e) {
 		/* Zero out the secret data */
@@ -132,10 +128,6 @@ static int efi_secret_unlink(struct inode *dir, struct dentry *dentry)
 
 	inode->i_private = NULL;
 
-	for (i = 0; i < EFI_SECRET_NUM_FILES; i++)
-		if (s->fs_files[i] == dentry)
-			s->fs_files[i] = NULL;
-
 	return simple_unlink(inode, dentry);
 }
 
@@ -186,15 +178,6 @@ static int efi_secret_map_area(struct platform_device *dev)
 static void efi_secret_securityfs_teardown(struct platform_device *dev)
 {
 	struct efi_secret *s = efi_secret_get();
-	int i;
-
-	for (i = (EFI_SECRET_NUM_FILES - 1); i >= 0; i--) {
-		securityfs_remove(s->fs_files[i]);
-		s->fs_files[i] = NULL;
-	}
-
-	securityfs_remove(s->fs_dir);
-	s->fs_dir = NULL;
 
 	securityfs_remove(s->secrets_dir);
 	s->secrets_dir = NULL;
@@ -209,7 +192,7 @@ static int efi_secret_securityfs_setup(struct platform_device *dev)
 	unsigned char *ptr;
 	struct secret_header *h;
 	struct secret_entry *e;
-	struct dentry *dent;
+	struct dentry *dent, *dir;
 	char guid_str[EFI_VARIABLE_GUID_LEN + 1];
 
 	ptr = (void __force *)s->secret_data;
@@ -232,8 +215,6 @@ static int efi_secret_securityfs_setup(struct platform_device *dev)
 	}
 
 	s->secrets_dir = NULL;
-	s->fs_dir = NULL;
-	memset(s->fs_files, 0, sizeof(s->fs_files));
 
 	dent = securityfs_create_dir("secrets", NULL);
 	if (IS_ERR(dent)) {
@@ -243,14 +224,13 @@ static int efi_secret_securityfs_setup(struct platform_device *dev)
 	}
 	s->secrets_dir = dent;
 
-	dent = securityfs_create_dir("coco", s->secrets_dir);
-	if (IS_ERR(dent)) {
+	dir = securityfs_create_dir("coco", s->secrets_dir);
+	if (IS_ERR(dir)) {
 		dev_err(&dev->dev, "Error creating coco securityfs directory entry err=%ld\n",
-			PTR_ERR(dent));
-		return PTR_ERR(dent);
+			PTR_ERR(dir));
+		return PTR_ERR(dir);
 	}
-	d_inode(dent)->i_op = &efi_secret_dir_inode_operations;
-	s->fs_dir = dent;
+	d_inode(dir)->i_op = &efi_secret_dir_inode_operations;
 
 	bytes_left = h->len - sizeof(*h);
 	ptr += sizeof(*h);
@@ -266,15 +246,14 @@ static int efi_secret_securityfs_setup(struct platform_device *dev)
 		if (efi_guidcmp(e->guid, NULL_GUID)) {
 			efi_guid_to_str(&e->guid, guid_str);
 
-			dent = securityfs_create_file(guid_str, 0440, s->fs_dir, (void *)e,
+			dent = securityfs_create_file(guid_str, 0440, dir, (void *)e,
 						      &efi_secret_bin_file_fops);
 			if (IS_ERR(dent)) {
 				dev_err(&dev->dev, "Error creating efi_secret securityfs entry\n");
 				ret = PTR_ERR(dent);
 				goto err_cleanup;
 			}
-
-			s->fs_files[i++] = dent;
+			i++;
 		}
 		ptr += e->len;
 		bytes_left -= e->len;
-- 
2.39.5