linux-kernel - Re: [PATCH 06/29] ceph: move ceph_xattr

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Date:   Tue, 3 Oct 2023 16:30:29 +0200
From:   Ilya Dryomov <idryomov@...il.com>
To:     Wedson Almeida Filho <wedsonaf@...il.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wedson Almeida Filho <walmeida@...rosoft.com>,
        Xiubo Li <xiubli@...hat.com>, Jeff Layton <jlayton@...nel.org>,
        ceph-devel@...r.kernel.org
Subject: Re: [PATCH 06/29] ceph: move ceph_xattr_handlers to .rodata

On Sat, Sep 30, 2023 at 7:01 AM Wedson Almeida Filho <wedsonaf@...il.com> wrote:
>
> From: Wedson Almeida Filho <walmeida@...rosoft.com>
>
> This makes it harder for accidental or malicious changes to
> ceph_xattr_handlers at runtime.
>
> Cc: Xiubo Li <xiubli@...hat.com>
> Cc: Ilya Dryomov <idryomov@...il.com>
> Cc: Jeff Layton <jlayton@...nel.org>
> Cc: ceph-devel@...r.kernel.org
> Signed-off-by: Wedson Almeida Filho <walmeida@...rosoft.com>
> ---
>  fs/ceph/super.h | 2 +-
>  fs/ceph/xattr.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/fs/ceph/super.h b/fs/ceph/super.h
> index 3bfddf34d488..b40be1a0f778 100644
> --- a/fs/ceph/super.h
> +++ b/fs/ceph/super.h
> @@ -1089,7 +1089,7 @@ ssize_t __ceph_getxattr(struct inode *, const char *, void *, size_t);
>  extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
>  extern struct ceph_buffer *__ceph_build_xattrs_blob(struct ceph_inode_info *ci);
>  extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci);
> -extern const struct xattr_handler *ceph_xattr_handlers[];
> +extern const struct xattr_handler * const ceph_xattr_handlers[];
>
>  struct ceph_acl_sec_ctx {
>  #ifdef CONFIG_CEPH_FS_POSIX_ACL
> diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
> index 806183959c47..0350d7465bbb 100644
> --- a/fs/ceph/xattr.c
> +++ b/fs/ceph/xattr.c
> @@ -1416,7 +1416,7 @@ void ceph_release_acl_sec_ctx(struct ceph_acl_sec_ctx *as_ctx)
>   * List of handlers for synthetic system.* attributes. Other
>   * attributes are handled directly.
>   */
> -const struct xattr_handler *ceph_xattr_handlers[] = {
> +const struct xattr_handler * const ceph_xattr_handlers[] = {
>         &ceph_other_xattr_handler,
>         NULL,
>  };
> --
> 2.34.1
>

Acked-by: Ilya Dryomov <idryomov@...il.com>

Thanks,

                Ilya