linux-kernel - Re: [PATCH], issue EOI to APIC prior to calling crash_kexec in die

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:	Wed, 6 Feb 2008 23:00:01 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Neil Horman <nhorman@...driver.com>
Cc:	linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, kexec@...ts.infradead.org
Subject: Re: [PATCH], issue EOI to APIC prior to calling crash_kexec in
	die_nmi path

* Neil Horman <nhorman@...driver.com> wrote:

>  	if (!user_mode_vm(regs)) {
> +		nmi_exit();
> +		local_irq_enable();
>  		current->thread.trap_no = 2;
>  		crash_kexec(regs);

looks good to me, but please move the local_irq_enable() to within 
crash_kexec() instead - probably inside the "got the kexec lock" 
section. That makes crash_kexec() use generally safer too i guess: right 
it seems that die() too can call crash_kexec() with irqs disabled - and 
can thus hang in smp_send_stop() [or wherever it hung before].

	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/