linux-kernel - Re: [PATCH] crash: Default to CRASH_DUMP=n when support for it is unlikely

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: <f355e26eead641f5f281372aadf9dee7de19a4c7.camel@physik.fu-berlin.de>
Date: Tue, 27 Aug 2024 08:37:22 +0200
From: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To: Baoquan He <bhe@...hat.com>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>, Dave Vasilevsky
 <dave@...ilevsky.ca>, linuxppc-dev@...ts.ozlabs.org,
 linux-sh@...r.kernel.org,  mpe@...erman.id.au, kexec@...ts.infradead.org,
 linux-kernel@...r.kernel.org,  Reimar Döffinger
 <Reimar.Doeffinger@....de>
Subject: Re: [PATCH] crash: Default to CRASH_DUMP=n when support for it is
 unlikely

On Tue, 2024-08-27 at 14:22 +0800, Baoquan He wrote:
> About why it's enabled by default, as Michael has explained in another
> thread, distros usualy needs to enable it by default because vmcore
> dumping is a very important feature on servers, even guest instances. 
> Even though kdump codes are enabled to built in, not providing
> crashkernel= value won't make vmcore dumping take effect, it won't cost
> system resources in that case.

OK, thanks for the explanation. But as we have found out in the mean time,
the assumption was wrong to enable it by default for all architectures as
some architectures cannot boot a crash dump kernel with their default bootloader
but only through kexec.

Can we have a follow-up patch to disable crash dump kernels where they're
not needed? I mean, not every platform supported by Linux is obviously a
x86-based or POWER-based server.

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913