linux-kernel - Re: i386-show-unhandled-signals-v3

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Message-Id: <20070725211528.03262aa3.akpm@linux-foundation.org>
Date:	Wed, 25 Jul 2007 21:15:28 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	masouds@...gle.com (Masoud Asgharifard Sharbiani)
Cc:	Andi Kleen <ak@...e.de>, Kirill Korotaev <dev@...nvz.org>,
	linux-kernel@...r.kernel.org
Subject: Re: i386-show-unhandled-signals-v3

On Wed, 25 Jul 2007 16:40:06 -0700 masouds@...gle.com (Masoud Asgharifard Sharbiani) wrote:

> This patch makes the i386 behave the same way that x86_64 does when a
> segfault happens. A line gets printed to the kernel log so that tools
> that need to check for failures can behave more uniformly between
> different kernels. Like x86_64, it can be disabled by setting
> debug.show_unhandled_signals sysctl variable to 0 (or by doing
> echo 0 > /proc/sys/debug/show_unhandled_signals)

Is that still correct?  Methinks /proc/sys/debug/exception-trace.

<Looks sadly at Documentation/filesystems/proc.txt>

<Argh, your patch was reversed. Applied with patch -R.>

> Also, all of the lines being printed are now using printk_ratelimit()
> to deny the ability of DoS from a local user with a program like the
> following:
> main()
> {
>        while (1)
>                if (!fork()) *(int *)0 = 0;
> }

yup.
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