linux-kernel - Re: Query about kdump_msg hook into crash

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: <20110201071933.GA21239@cr0.nay.redhat.com>
Date:	Tue, 1 Feb 2011 15:19:50 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Jarod Wilson <jwilson@...hat.com>
Subject: Re: Query about kdump_msg hook into crash_kexec()

On Mon, Jan 31, 2011 at 05:59:39PM -0500, Vivek Goyal wrote:
>
>Anyway, if an image is loaded and we have setup to capture dump also
>why do we need to save kmsg with the help of an helper. I am assuming
>this is more of a debugging aid if we have no other way to capture the
>kernel log buffer. So if somebody has setup kdump to capture the
>vmcore, why to call another handler which tries to save part of the
>vmcore (kmsg) separately.
>

Well, kmsg dumper is not only for panic/oops, it can also save kernel
messages when the system is reboot/halt.

Yeah, it is true that vmcore contains log_buf, but I think the users
of ramoops/mtdoops are mainly those who don't have kdump configured
in their kernels, they are cheaper than kdump, but less powerful.

Thanks.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/