linux-ext4 - Re: ioctl32 (was Re: filefrag abort)

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 for Android: free password hash cracker in your pocket

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

Date:	Wed, 22 Jul 2009 23:51:07 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Andreas Dilger <adilger@....com>
CC:	Ron Johnson <ron.l.johnson@....net>, linux-ext4@...r.kernel.org
Subject: Re: ioctl32 (was Re: filefrag abort)

Andreas Dilger wrote:
> On Jul 21, 2009  19:57 -0500, Eric Sandeen wrote:
>> Ron Johnson wrote:
>>> On 2009-07-20 21:03, Theodore Tso wrote:
>>>> On Mon, Jul 20, 2009 at 04:49:04PM -0500, Ron Johnson wrote:
>>>>> Hi,
>>>>>
>>>>> (Is this OT?  http://sourceforge.net/forum/forum.php?forum_id=7052  
>>>>> doesn't show much activity...)
>>>>>
>>>>> Debian Sid, e2fsprogs 1.41.8-1
>>>>> Home-rolled 64-bit 2.6.30 with 32-bit userland
>>>> Should be fixed in e2fsprogs 1.41.8-2
>>> ff seems to work now, but I still get this in dmesg:
>>>
>>> [188883.274547] ioctl32(filefrag:7086): Unknown cmd fd(3) 
>>> cmd(c020660b){t:'f';sz:32} arg(ffacb808) on /some/large/file
>> Huh, did we miss a compat ioctl for fiemap.... looks like so.  I'll look
>> into that tomorrow, thanks.
> 
> Sigh, I wish there was some sort of automatic ioctl parser tool that
> would report if the ioctl will need compat handling or not.  I thought
> the fiemap structs didn't need any compat handling because they are
> properly sized/aligned and w/o pointers...

They are properly sized yep but I think they still have to be flagged:

/* pointer to compatible structure or no argument */
#define COMPATIBLE_IOCTL(cmd) \
        { (cmd), do_ioctl32_pointer },

I have to remind myself how this all works, despite doing a bunch of
ioctl32 work for xfs last year :)

I think adding COMPATIBLE_IOCTL(FS_IOC_FIEMAP); to fs/compat_ioctl.c
should be enough, I'll try to get it tested tomorrow.

-Eric

-Eric
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html