linux-kernel - Re: [PATCH] ext3: fsid for statvfs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 10 Oct 2006 13:36:36 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Pekka J Enberg <penberg@...helsinki.fi>,
	Bryan Henderson <hbryan@...ibm.com>,
	Andries Brouwer <aebr@....tue.nl>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	sct@...hat.com, adilger@...sterfs.com,
	linux-kernel@...r.kernel.org, ext2-devel@...ts.sourceforge.net
Subject: Re: [PATCH] ext3: fsid for statvfs

On Tue, 10 Oct 2006 11:32:13 +0300 (EEST)
Pekka J Enberg <penberg@...helsinki.fi> wrote:

> From: Pekka Enberg <penberg@...helsinki.fi>
> 
> Update ext3_statfs to return an FSID that is a 64 bit XOR of the 128 bit
> filesystem UUID as suggested by Andreas Dilger. See the following Bugzilla
> entry for details:
> 
>   http://bugzilla.kernel.org/show_bug.cgi?id=136
> 
> Cc: Andreas Dilger <adilger@...sterfs.com>
> Cc: Stephen Tweedie <sct@...hat.com>
> Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>

Deja vu.  Gosh, has it really been four years?

Combatants cc'ed ;)

> 
>  fs/ext3/super.c |    5 +++++
>  1 file changed, 5 insertions(+)
> 
> Index: 2.6/fs/ext3/super.c
> ===================================================================
> --- 2.6.orig/fs/ext3/super.c
> +++ 2.6/fs/ext3/super.c
> @@ -2385,6 +2385,7 @@ static int ext3_statfs (struct dentry * 
>  	struct ext3_super_block *es = sbi->s_es;
>  	ext3_fsblk_t overhead;
>  	int i;
> +	u64 fsid;
>  
>  	if (test_opt (sb, MINIX_DF))
>  		overhead = 0;
> @@ -2431,6 +2432,10 @@ static int ext3_statfs (struct dentry * 
>  	buf->f_files = le32_to_cpu(es->s_inodes_count);
>  	buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter);
>  	buf->f_namelen = EXT3_NAME_LEN;
> +	fsid = le64_to_cpup((void *)es->s_uuid) ^
> +	       le64_to_cpup((void *)es->s_uuid + sizeof(u64));
> +	buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
> +	buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
>  	return 0;
>  }
>  

ext2 and ext4 would need patching too...
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/