From: Andi Kleen <ak@suse.de>
To: pageexec@freemail.hu
Cc: Willy Tarreau <w@1wt.eu>,
marcelo@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] x86_64: another fix for canonical RIPs during signal handling
Date: Fri, 23 Jun 2006 14:29:04 +0200 [thread overview]
Message-ID: <200606231429.04909.ak@suse.de> (raw)
In-Reply-To: <449BC808.4174.277D15CF@pageexec.freemail.hu>
>
> that's not true. if the application expects to crash due to a bad
> signal handler then rip=0 may or may not achieve that, depending on
> what mapping exists at that address - this is inconsistent behaviour
> (from userland's point of view) created by the kernel itself, hence
> this is a kernel bug and should be fixed.
If it "wants" to crash it can just jump to 0 (or whatever unmapped address
it has) by itself. No need to involve the kernel here.
The only point of the patch was to not make the kernel/CPU crash due
to CPU bugs triggered by applications. But we really
don't care what happens to the application when it corrupts its stack frame.
-Andi
next prev parent reply other threads:[~2006-06-23 12:33 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-22 21:06 [PATCH] x86_64: another fix for canonical RIPs during signal handling Willy Tarreau
2006-06-22 21:26 ` Andi Kleen
2006-06-22 21:33 ` Willy Tarreau
2006-06-22 22:17 ` Andi Kleen
[not found] ` <449BC808.4174.277D15CF@pageexec.freemail.hu>
2006-06-23 12:29 ` Andi Kleen [this message]
[not found] ` <449C0616.4382.286F7C8C@pageexec.freemail.hu>
2006-06-23 13:32 ` Willy Tarreau
2006-06-23 13:46 ` Andi Kleen
2006-06-23 13:52 ` Willy Tarreau
2006-06-23 14:51 ` Alan Cox
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