linux-kernel - Re: [PATCH 3/3] x86: Disable running 32bit processes if ia32

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]

Message-ID: <4217f682-f0e3-28de-1fb9-634c5df3581a@suse.cz>
Date:   Thu, 8 Jun 2023 08:16:27 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Andrew Cooper <andrew.cooper3@...rix.com>,
        Nikolay Borisov <nik.borisov@...e.com>, x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, mhocko@...e.com
Subject: Re: [PATCH 3/3] x86: Disable running 32bit processes if ia32_disabled
 is passed

On 08. 06. 23, 2:25, Thomas Gleixner wrote:
> I really wish that we could disable syscall32 reliably on AMD and make
> it raise #UD as it does on Intal.

Sorry, I am likely missing something, but why is not #GP enough when we 
set CSTAR = 0? It's of course not as good as Intel's *defined* #UD, but 
why is not the above sufficient/reliable?

thanks,
-- 
js
suse labs