linux-kernel - Re: [PATCH] fs: add the tuncate check of exfat and hfsplus

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Date:   Tue, 7 Mar 2023 18:38:28 +0900
From:   Namjae Jeon <linkinjeon@...nel.org>
To:     MIngyi Cong <congmingyi@...il.com>
Cc:     senozhatsky@...omium.org, sfrench@...ba.org, hyc.lee@...il.com,
        linux-kernel@...r.kernel.org, linux-cifs@...r.kernel.org
Subject: Re: [PATCH] fs: add the tuncate check of exfat and hfsplus

2023-03-04 17:35 GMT+09:00, MIngyi Cong <congmingyi@...il.com>:
> From: Mingyi Cong <congmingyi@...il.com>
>
> EXFAT and HFSPLUS will fill zero data in truncated range.
> Fix this by adding *_SUPER_MAGIC check.
>
> Signed-off-by: Mingyi Cong <congmingyi@...il.com>
> ---
>  fs/ksmbd/smb2pdu.c         | 4 +++-
>  include/uapi/linux/magic.h | 2 ++
>  2 files changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
> index ac029dfd2..10ab929ad 100644
> --- a/fs/ksmbd/smb2pdu.c
> +++ b/fs/ksmbd/smb2pdu.c
> @@ -5738,7 +5738,9 @@ static int set_end_of_file_info(struct ksmbd_work
> *work, struct ksmbd_file *fp,
>  	 * truncate of some filesystem like FAT32 fill zero data in
>  	 * truncated range.
>  	 */
> -	if (inode->i_sb->s_magic != MSDOS_SUPER_MAGIC) {
> +	if (inode->i_sb->s_magic != MSDOS_SUPER_MAGIC ||
> +		inode->i_sb->s_magic != EXFAT_SUPER_MAGIC ||
> +		inode->i_sb->s_magic != HFSPLUS_SUPER_MAGIC) {
>  		ksmbd_debug(SMB, "filename : %s truncated to newsize %lld\n",
>  			    fp->filename, newsize);
>  		rc = ksmbd_vfs_truncate(work, fp, newsize);
> diff --git a/include/uapi/linux/magic.h b/include/uapi/linux/magic.h
> index 35687dcb1..687b7f584 100644
> --- a/include/uapi/linux/magic.h
> +++ b/include/uapi/linux/magic.h
> @@ -43,6 +43,8 @@
>  #define MINIX3_SUPER_MAGIC	0x4d5a		/* minix v3 fs, 60 char names */
>
>  #define MSDOS_SUPER_MAGIC	0x4d44		/* MD */
> +#define EXFAT_SUPER_MAGIC	0x2011BAB0UL		/* EXFAT */
EXFAT_SUPER_MAGIC is already here. Please check it.

> +#define HFSPLUS_SUPER_MAGIC	0x482b		/* HFSPLUS */
Is there no need to add HFS magic?

>  #define NCP_SUPER_MAGIC		0x564c		/* Guess, what 0x564c is :-) */
>  #define NFS_SUPER_MAGIC		0x6969
>  #define OCFS2_SUPER_MAGIC	0x7461636f
> --
> 2.34.1
>
>