linux-kernel - Re: [PATCH 30/30] x32: Add x32 VDSO support

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Message-ID: <4F43EA83.6020203@zytor.com>
Date:	Tue, 21 Feb 2012 11:03:31 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andrew Lutomirski <luto@....edu>
CC:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	mingo@...nel.org, tglx@...utronix.de,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	hjl.tools@...il.com
Subject: Re: [PATCH 30/30] x32: Add x32 VDSO support

On 02/21/2012 10:54 AM, Andrew Lutomirski wrote:
> 
> uclibc hardcodes a call to the vsyscall gettimeofday implementation in
> its locking primitives, which probably gives terrible performance, but
> that's a separate issue.  I think do_emulate_vsyscall should send a
> segfault if called by an x32 task -- there's some security benefit to
> doing so, and there's unlikely to be any downside.
> 

The vsyscall page shouldn't be mapped for x32 tasks...

	-hpa


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