linux-kernel - Re: [PATCH 1/2] selftests/lkdtm: Don't clear dmesg when running tests

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]

Date:   Fri, 8 May 2020 00:30:13 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] selftests/lkdtm: Don't clear dmesg when running tests

On Fri, May 08, 2020 at 04:53:55PM +1000, Michael Ellerman wrote:
> It is Very Rude to clear dmesg in test scripts. That's because the
> script may be part of a larger test run, and clearing dmesg
> potentially destroys the output of other tests.
> 
> We can avoid using dmesg -c by saving the content of dmesg before the
> test, and then using diff to compare that to the dmesg afterward,
> producing a log with just the added lines.

Sounds good to me!

> 
> Signed-off-by: Michael Ellerman <mpe@...erman.id.au>

Acked-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook