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

from [Andi Kleen] [Permanent Link][Original]
To: Markus Gutschke (ÜÒÐ) <markus@google.com>
Subject: Re: [PATCH 2/2] x86-64: seccomp: fix 32/64 syscall hole
From: Andi Kleen <andi@firstfloor.org>
Date: Fri, 08 May 2009 21:18:44 +0200
Cc: Ingo Molnar <mingo@elte.hu>, Linus Torvalds <torvalds@linux-foundation.org>, Roland McGrath <roland@redhat.com>, Andrew Morton <akpm@linux-foundation.org>, x86@kernel.org, linux-kernel@vger.kernel.org, stable@kernel.org, linux-mips@linux-mips.org, sparclinux@vger.kernel.org, linuxppc-dev@ozlabs.org
In-reply-to: <904b25810905061508n6d9cb8dbg71de5b1e0332ede7@mail.gmail.com> (Markus Gutschke's message of "Wed, 6 May 2009 15:08:40 -0700")
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <20090228030226.C0D34FC3DA@magilla.sf.frob.com> <20090228030413.5B915FC3DA@magilla.sf.frob.com> <alpine.LFD.2.00.0902271932520.3111@localhost.localdomain> <alpine.LFD.2.00.0902271948570.3111@localhost.localdomain> <20090228072554.CFEA6FC3DA@magilla.sf.frob.com> <alpine.LFD.2.00.0902280916470.3111@localhost.localdomain> <904b25810905061146ged374f2se0afd24e9e3c1f06@mail.gmail.com> <20090506212913.GC4861@elte.hu> <904b25810905061446m73c42040nfff47c9b8950bcfa@mail.gmail.com> <20090506215450.GA9537@elte.hu> <904b25810905061508n6d9cb8dbg71de5b1e0332ede7@mail.gmail.com>
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"Markus Gutschke (ÜÒÐ)" <markus@google.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@linux.intel.com -- Speaking for myself only.
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