linux-kernel - [PATCH 09/29] ext2: move ext2_xattr_handlers and ext2_xattr_handler

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Message-Id: <20230930050033.41174-10-wedsonaf@gmail.com>
Date:   Sat, 30 Sep 2023 02:00:13 -0300
From:   Wedson Almeida Filho <wedsonaf@...il.com>
To:     Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        linux-fsdevel@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Wedson Almeida Filho <walmeida@...rosoft.com>,
        Jan Kara <jack@...e.com>, linux-ext4@...r.kernel.org
Subject: [PATCH 09/29] ext2: move ext2_xattr_handlers and ext2_xattr_handler_map to .rodata

From: Wedson Almeida Filho <walmeida@...rosoft.com>

This makes it harder for accidental or malicious changes to
ext2_xattr_handlers or ext2_xattr_handler_map at runtime.

Cc: Jan Kara <jack@...e.com>
Cc: linux-ext4@...r.kernel.org
Signed-off-by: Wedson Almeida Filho <walmeida@...rosoft.com>
---
 fs/ext2/xattr.c | 4 ++--
 fs/ext2/xattr.h | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/ext2/xattr.c b/fs/ext2/xattr.c
index 8906ba479aaf..cfbe376da612 100644
--- a/fs/ext2/xattr.c
+++ b/fs/ext2/xattr.c
@@ -98,7 +98,7 @@ static struct buffer_head *ext2_xattr_cache_find(struct inode *,
 static void ext2_xattr_rehash(struct ext2_xattr_header *,
 			      struct ext2_xattr_entry *);
 
-static const struct xattr_handler *ext2_xattr_handler_map[] = {
+static const struct xattr_handler * const ext2_xattr_handler_map[] = {
 	[EXT2_XATTR_INDEX_USER]		     = &ext2_xattr_user_handler,
 #ifdef CONFIG_EXT2_FS_POSIX_ACL
 	[EXT2_XATTR_INDEX_POSIX_ACL_ACCESS]  = &nop_posix_acl_access,
@@ -110,7 +110,7 @@ static const struct xattr_handler *ext2_xattr_handler_map[] = {
 #endif
 };
 
-const struct xattr_handler *ext2_xattr_handlers[] = {
+const struct xattr_handler * const ext2_xattr_handlers[] = {
 	&ext2_xattr_user_handler,
 	&ext2_xattr_trusted_handler,
 #ifdef CONFIG_EXT2_FS_SECURITY
diff --git a/fs/ext2/xattr.h b/fs/ext2/xattr.h
index 7925f596e8e2..6a4966949047 100644
--- a/fs/ext2/xattr.h
+++ b/fs/ext2/xattr.h
@@ -72,7 +72,7 @@ extern void ext2_xattr_delete_inode(struct inode *);
 extern struct mb_cache *ext2_xattr_create_cache(void);
 extern void ext2_xattr_destroy_cache(struct mb_cache *cache);
 
-extern const struct xattr_handler *ext2_xattr_handlers[];
+extern const struct xattr_handler * const ext2_xattr_handlers[];
 
 # else  /* CONFIG_EXT2_FS_XATTR */
 
-- 
2.34.1