linux-kernel - Re: old buffer overflow in moxa driver

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:	Tue, 01 May 2007 09:58:47 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	dann frazier <dannf@...com>, linux-kernel@...r.kernel.org,
	support@...a.com.tw, dilinger@...ian.org
Subject: Re: old buffer overflow in moxa driver

Alan Cox napsal(a):
>>   I noticed that the moxa input checking security bug described by
>> CVE-2005-0504 appears to remain unfixed upstream.
>>  
>> The issue is described here:
>>   http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-0504
>>
>> Debian has been shipping the following patch from Andres Salomon. I
>> tried contacting the listed maintainer a few months ago but received
>> no response.
> 
> 
>        case MOXA_LOAD_BIOS:
>         case MOXA_FIND_BOARD:
>         case MOXA_LOAD_C320B:
>         case MOXA_LOAD_CODE:
>                 if (!capable(CAP_SYS_RAWIO))
>                         return -EPERM;
>                 break;
> 
> At the point you abuse these calls you can already just load arbitary
> data from userspace anyway.

The problem is that we BUG_ON, when len < 0 in copy_from_user which is unlikely
something we want to cause?

regards,
-- 
http://www.fi.muni.cz/~xslaby/            Jiri Slaby
faculty of informatics, masaryk university, brno, cz
e-mail: jirislaby gmail com, gpg pubkey fingerprint:
B674 9967 0407 CE62 ACC8  22A0 32CC 55C3 39D4 7A7E
-
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/