linux-kernel - Re: [PATCH v3 1/1] use crc32 instead of md5 for hibernation e820 integrity check

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] [day] [month] [year] [list]

Date:   Wed, 7 Apr 2021 13:59:46 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Chris von Recklinghausen <crecklin@...hat.com>
Cc:     ardb@...nel.org, simo@...hat.com, rafael@...nel.org,
        decui@...rosoft.com, linux-pm@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/1] use crc32 instead of md5 for hibernation e820
 integrity check

On Wed, Apr 07, 2021 at 06:04:21AM -0400, Chris von Recklinghausen wrote:
> Suspend fails on a system in fips mode because md5 is used for the e820
> integrity check and is not available. Use crc32 instead.
> 
> Prior to this patch, MD5 is used only to create a digest to ensure integrity of
> the region, no actual encryption is done. This patch set changes the integrity
> check to use crc32 instead of md5 since crc32 is available in both FIPS and
> non-FIPS modes.
> 
> Fixes: 62a03defeabd ("PM / hibernate: Verify the consistent of e820 memory map
>        by md5 digest")
> 
> Tested-by: Dexuan Cui <decui@...rosoft.com>
> Reviewed-by: Dexuan Cui <decui@...rosoft.com>
> Signed-off-by: Chris von Recklinghausen <crecklin@...hat.com>

Please include an explanation about whether this use case requires cryptographic
security or not.

- Eric