Message-ID: <44676F42.7080907@aknet.ru>
Date: Sun, 14 May 2006 21:56:18 +0400
From: Stas Sergeev <stsp@aknet.ru>
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To: Andi Kleen <ak@muc.de>
Cc: Linux kernel <linux-kernel@vger.kernel.org>
Subject: Re: Segfault on the i386 enter instruction
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Hi.

Andi Kleen wrote:
> Handling it like you expect would require to disassemble 
> the function in the page fault handler and it's probably not 
> worth doing that for this weird case.
Just wondering, is this case really that weird?
In fact, the check against %esp that the kernel
does, looks strange. I realize that it can catch a
(very rare) user-space bug of accessing below %esp, but
other than that it looks redundant (IMHO) and as soon as
it triggers the false-positives, what is it really good for?
Aren't the rlimit and the other checks of acct_stack_growth()
not enough, or am I missing something obvious?

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