linux-kernel - Re: + fully-honor-vdso_enabled.patch added to -mm tree

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Message-ID: <45E894FA.2040103@BitWagon.com>
Date:	Fri, 02 Mar 2007 13:19:54 -0800
From:	John Reiser <jreiser@...Wagon.com>
To:	Oleg Nesterov <oleg@...sign.ru>
CC:	Paul Mundt <lethal@...ux-sh.org>, Andi Kleen <ak@...e.de>,
	Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: + fully-honor-vdso_enabled.patch added to -mm tree

Oleg Nesterov wrote:

> Still, I don't understand why we don't pass NEW_AUX_ENT(AT_SYSINFO) when
> vdso_enabled == 0. We don't need linux-gate.so to use __kernel_vsyscall,
> we have FIX_VDSO. In that case we should s/PAGE_KERNEL_RO/PAGE_READONLY/
> of course. I guess the reason is some magic in glibc.

In the past there were problems where user code could not single-step
(or even read the code of) such system calls.  Can these two operations
be performed today with what you propose, particularly if FIX_VDSO is
near 0xfffff000 ?

-- 
John Reiser, jreiser@...Wagon.com
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