linux-kernel - Systrace 2.6.19 patch -- need comments

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Message-ID: <20061209201625.20f4210b@silver>
Date:	Sat, 9 Dec 2006 20:16:25 +0100
From:	iSteve <isteve@...ez.cz>
To:	linux-kernel@...r.kernel.org
Subject: Systrace 2.6.19 patch -- need comments

Hi,
while getting familiar with OpenBSD, I've noticed a utility called systrace
(http://www.citi.umich.edu/u/provos/systrace/, http://www.systrace.org/). This
application can alter behavior of syscalls on a simple rules basis; it can
operate on various backends and systems: it's native in OpenBSD and NetBSD, it
has generic ptrace backend (yes, I know that's not really safe) and it has a
Linux kernel patch.

The latest Linux kernel patch I've found was for 2.6.13.4; I've found no mention
of systrace whatsoever when searching through LKML, so I've decided to try my
best and upgrade it to 2.6.19.

Please see the attached patch; it basically only fixes of what didn't apply
clean with the old patch. It's been vaguely tested and it appears to work
as expected.

As I'm not the author, nor do I understand exactly the internals, I'd merely
like to ask someone to look at it, comment it, perhaps even fix it; in the most
optimistic thoughts, maintain it.

My thought on the patch is that linux_sysent.c could be replaced by something
way cleaner. Also, I'm not entirely certain whether it should be in drivers/
instead of security/. Last but definitely not least, only x86 asm code is
available, so it'd have to be ported to other architectures as well.

Thanks in advance for any reply.

PS.: Please, CC me, I'm off-list.
PPS.: To build systrace userland application to use the Linux kernel backend,
ensure that the configure script has access to systrace header files.

View attachment "systrace-2.6.19.diff" of type "text/x-patch" (74886 bytes)