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

[Eric Biggers]

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@xxxxxxxxxxxxx>
> Reviewed-by: Dexuan Cui <decui@xxxxxxxxxxxxx>
> Signed-off-by: Chris von Recklinghausen <crecklin@xxxxxxxxxx>

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

- Eric