linux-kernel - Re: [patch] Add basic sanity checks to the syscall execution patch

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: <8ee0b8e80809060934y385c1fefhd614befccbf64869@mail.gmail.com>
Date:	Sat, 6 Sep 2008 18:34:56 +0200
From:	"Jeroen van Rijn" <jvrnix@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Willy Tarreau" <w@....eu>,
	"Benjamin Herrenschmidt" <benh@...nel.crashing.org>,
	pageexec@...email.hu, "Andi Kleen" <andi@...stfloor.org>,
	"Arjan van de Ven" <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, tglx@...x.de, hpa@...or.com
Subject: Re: [patch] Add basic sanity checks to the syscall execution patch

> a reboot often raises attention. But yes, in terms of end user boxes,
> probably not. Anyway, my points were about transparent rootkits
> installed on a running system without anyone noticing - obviously if the
> attacker can modify the kernel image and the user does not mind a reboot
> it's game over.
>

Hi,

can't then, in this scenario, the VFS keep tabs on /boot/vmlinuz and
only allow modification when the process in question properly
authenticates itself. As long as we're talking signed modules, why not
lock certain files down as well?

e.g. hand the kernel a signed list of files to watch write access to,
and allow only after the process auths via a private key.

-- Jeroen.

n.b. I understand this would slow down things more, but if we're
talking about taking extreme measures...
--
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/