Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
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Date: Mon, 21 May 2012 12:13:05 -0700
From: "H. Peter Anvin" <>
To: richard -rw- weinberger <>
CC: Eric Paris <>, Will Drewry <>,,,,,,,,,,,,,,,,,,,,
Subject: Re: seccomp and ptrace. what is the correct order?

On 05/21/2012 11:47 AM, richard -rw- weinberger wrote:
> On Mon, May 21, 2012 at 8:21 PM, Eric Paris <> wrote:
>> Is that what we want?  Do we want to do the permission check based on
>> what a process ask at syscall enter or do we want to do the permission
>> check based on what the kernel is actually going to do on behalf of
>> the process?
> I think we want the latter.
> A system call emulator like UserModeLinux would benefit from that.

Are you sure?  This would mean that a seccomp program used by the
process to intercept its own system calls via SIGSYS would give
completely different results under UML than under native...


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