linux-kernel - Re: System call interposition/unprotecting the table

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: <20070814123425.4f61b42f@the-village.bc.nu>
Date:	Tue, 14 Aug 2007 12:34:25 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Avi Kivity <avi@...o.co.il>
Cc:	hinoue@...l.carleton.ca, linux-kernel@...r.kernel.org
Subject: Re: System call interposition/unprotecting the table

On Tue, 14 Aug 2007 08:12:29 +0300
Avi Kivity <avi@...o.co.il> wrote:

> Alan Cox wrote:
> > This is to protect it from being changed by an attacker or someone trying
> > to do strange and bogus things to the kernel.
> >   
> 
> Someone who apparently hasn't heard of vmap(), etc.
> 
> It's a debug aid at best.

You assume the average attacker is smart. Fortunately this isn't true,
although some certainly are. For guests however we can push this further
as a hypervisor can implement 'irrevocably read only' pages for a guest.
Something we don't currently do but should.

Alan
-
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/