linux-kernel - System call audit

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Date:	Mon, 12 May 2008 20:06:17 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	David Woodhouse <dwmw2@...radead.org>, linux-kernel@...r.kernel.org
Cc:	mingo@...hat.com
Subject: System call audit

Hi David,

As I am looking into the system-wide system call tracing problem, I
start to wonder how auditsc deals with the fact that user-space could
concurrently change the content referred to by the __user pointers.

This would be the case for execve. If we create a program with two
thread; one is executing execve syscalls and the other thread would be
modifying the userspace string containing the name of the program to
execute. Since we have two copy_from_user, one in auditsc and one in the
real execve() function, the string passed to the OS could differ from
the string seen by auditsc.

Regards,

Mathieu

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Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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