linux-kernel - Re: [PATCH] debugfs: convert gid= argument from decimal, not octal

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Date:	Wed, 2 Jan 2013 10:42:17 -0800
From:	Kees Cook <keescook@...omium.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Dave Reisner <dreisner@...hlinux.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Vasiliy Kulikov <segoon@...nwall.com>
Subject: Re: [PATCH] debugfs: convert gid= argument from decimal, not octal

On Wed, Jan 2, 2013 at 10:33 AM, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
> On Wed, Jan 02, 2013 at 08:54:37AM -0500, Dave Reisner wrote:
>> This patch technically breaks userspace, but I suspect that anyone who
>> actually used this flag would have encountered this brokenness, declared
>> it lunacy, and already sent a patch.
>
> Kees is the one that originally did this change (I think, right?)

I recommended the default change, but I think it was Vasiliy that
added the gid option, IIRC.

> Kees, any objection to this patch?  Will it break your existing systems?

Regardless, I have no objection -- this should be int, not octal.

-Kees

>
> thanks,
>
> greg k-h
>
>>
>> Signed-off-by: Dave Reisner <dreisner@...hlinux.org>
>> ---
>>  fs/debugfs/inode.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
>> index 153bb1e..a5f12b7 100644
>> --- a/fs/debugfs/inode.c
>> +++ b/fs/debugfs/inode.c
>> @@ -176,7 +176,7 @@ static int debugfs_parse_options(char *data, struct debugfs_mount_opts *opts)
>>                       opts->uid = uid;
>>                       break;
>>               case Opt_gid:
>> -                     if (match_octal(&args[0], &option))
>> +                     if (match_int(&args[0], &option))
>>                               return -EINVAL;
>>                       gid = make_kgid(current_user_ns(), option);
>>                       if (!gid_valid(gid))
>> --
>> 1.8.0.3



--
Kees Cook
Chrome OS Security
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