linux-kernel - [PATCH 08/29] erofs: move erofs_xattr_handlers and xattr_handler

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Date:   Sat, 30 Sep 2023 02:00:12 -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>,
        Gao Xiang <xiang@...nel.org>, Chao Yu <chao@...nel.org>,
        Yue Hu <huyue2@...lpad.com>,
        Jeffle Xu <jefflexu@...ux.alibaba.com>,
        linux-erofs@...ts.ozlabs.org
Subject: [PATCH 08/29] erofs: move erofs_xattr_handlers and xattr_handler_map to .rodata

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

This makes it harder for accidental or malicious changes to
erofs_xattr_handlers or xattr_handler_map at runtime.

Cc: Gao Xiang <xiang@...nel.org>
Cc: Chao Yu <chao@...nel.org>
Cc: Yue Hu <huyue2@...lpad.com>
Cc: Jeffle Xu <jefflexu@...ux.alibaba.com>
Cc: linux-erofs@...ts.ozlabs.org
Signed-off-by: Wedson Almeida Filho <walmeida@...rosoft.com>
---
 fs/erofs/xattr.c | 2 +-
 fs/erofs/xattr.h | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
index 40178b6e0688..a6dd68ea5df2 100644
--- a/fs/erofs/xattr.c
+++ b/fs/erofs/xattr.c
@@ -166,7 +166,7 @@ const struct xattr_handler __maybe_unused erofs_xattr_security_handler = {
 };
 #endif
 
-const struct xattr_handler *erofs_xattr_handlers[] = {
+const struct xattr_handler * const erofs_xattr_handlers[] = {
 	&erofs_xattr_user_handler,
 	&erofs_xattr_trusted_handler,
 #ifdef CONFIG_EROFS_FS_SECURITY
diff --git a/fs/erofs/xattr.h b/fs/erofs/xattr.h
index f16283cb8c93..b246cd0e135e 100644
--- a/fs/erofs/xattr.h
+++ b/fs/erofs/xattr.h
@@ -23,7 +23,7 @@ static inline const char *erofs_xattr_prefix(unsigned int idx,
 {
 	const struct xattr_handler *handler = NULL;
 
-	static const struct xattr_handler *xattr_handler_map[] = {
+	static const struct xattr_handler * const xattr_handler_map[] = {
 		[EROFS_XATTR_INDEX_USER] = &erofs_xattr_user_handler,
 #ifdef CONFIG_EROFS_FS_POSIX_ACL
 		[EROFS_XATTR_INDEX_POSIX_ACL_ACCESS] = &nop_posix_acl_access,
@@ -44,7 +44,7 @@ static inline const char *erofs_xattr_prefix(unsigned int idx,
 	return xattr_prefix(handler);
 }
 
-extern const struct xattr_handler *erofs_xattr_handlers[];
+extern const struct xattr_handler * const erofs_xattr_handlers[];
 
 int erofs_xattr_prefixes_init(struct super_block *sb);
 void erofs_xattr_prefixes_cleanup(struct super_block *sb);
-- 
2.34.1