linux-kernel - Re: [PATCH 1/4] KEYS: Insert incompressible bytes to reserve space in bzImage

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: <14475.1480064784@warthog.procyon.org.uk>
Date:   Fri, 25 Nov 2016 09:06:24 +0000
From:   David Howells <dhowells@...hat.com>
To:     Mehmet Kayaalp <mkayaalp@...ux.vnet.ibm.com>
Cc:     dhowells@...hat.com, Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        Stefan Berger <stefanb@...ux.vnet.ibm.com>,
        George Wilson <gcwilson@...ibm.com>,
        LSM <linux-security-module@...r.kernel.org>,
        keyrings@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] KEYS: Insert incompressible bytes to reserve space in bzImage

Mehmet Kayaalp <mkayaalp@...ux.vnet.ibm.com> wrote:

> Include a random filled binary in vmlinux at the space reserved with
> CONFIG_SYSTEM_EXTRA_CERTIFICATE. This results in an uncompressed reserved
> area inside the bzImage as well, so that it can be replaced with an actual
> certificate later (after the bzImage is distributed).

You haven't said *why* you need an incompressible buffer.  I presume it's
something to do with the decompression wrapper.

David