linux-kernel - Re: [patch] fix emergency reboot: call reboot notifier list if possible

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: <20070117102510.GA20917@elte.hu>
Date:	Wed, 17 Jan 2007 11:25:11 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Morton <akpm@...l.org>
Cc:	rmk+lkml@....linux.org.uk, linux-kernel@...r.kernel.org
Subject: Re: [patch] fix emergency reboot: call reboot notifier list if possible

* Andrew Morton <akpm@...l.org> wrote:

> Making it dependent upon CONFIG_PREEMPT seems a bit sucky.  Perhaps 
> pass in some "you were called from /proc/sysrq-trigger" notification?

looks quite invasive to the whole sysrq interfaces, it trickles all the 
way down into sysrq.c's handler prototype, affecting 20 prototypes. 
Worth the trouble?

> Also, there are ways of telling if the kernel has oopsed (oops 
> counter, oops_in_progress, etc) which should perhaps be tested.

i'm not sure. Should we perhaps forget this patch and only do the 
i386/x86_64 VMX patch i sent?

> Or just learn to type `reboot -fn' ;)

well, emergency_reboot() might also be called from panic(), if someone 
sets panic_timeout, resulting in a similar hang. It might be called from 
a serial console on a soft-locked-up system, having no physical access 
to the system. Having a hung reboot in that scenario is not really 
productive.

	Ingo
-
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/