linux-kernel - Re: [PATCH 2/2] x86-64: seccomp: fix 32/64 syscall hole

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Message-ID: <878wl7o12j.fsf@basil.nowhere.org>
Date:	Fri, 08 May 2009 21:18:44 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Markus Gutschke (ÜÒÐ) 
	<markus@...gle.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Roland McGrath <roland@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	linux-mips@...ux-mips.org, sparclinux@...r.kernel.org,
	linuxppc-dev@...abs.org
Subject: Re: [PATCH 2/2] x86-64: seccomp: fix 32/64 syscall hole

"Markus Gutschke (ÜÒÐ)" <markus@...gle.com> writes:
>
> There are a large number of system calls that "normal" C/C++ code uses
> quite frequently, and that are not security sensitive. A typical
> example would be gettimeofday().

At least on x86-64 gettimeofday() (and time(2)) work inside seccomp because 
they're vsyscalls that run in ring 3 only.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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