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Tag: process isolation
Kristaps Dzonsons - Process isolation for NetBSD and OpenBSD
Added: 24 May 2009
Tags: dcbsdcon, dcbsdcon2009, slides, openbsd, netbsd, process isolation, kristaps dzonsons
PDF (687 Kb, 27 pages)
In NetBSD and OpenBSD, user-land process and
process-context isolation is limited to credential
cross-checks, file-system chroot and explicit
systrace/kauth applications. I'll demonstrate a
working mechanism of isolated process trees in
branched OpenBSD-4.4 and NetBSD-5.0-beta kernels
where an isolated process is started by a system
call similar to fork; following that, the child
process and its descendants execute in a context
isolated from the caller. This system is the continued
work of "mult" -- first prototyped in a branched
NetBSD-3.1 kernel and isolating all system resources
-- pared down to a lightweight, auditable patch of
process-only separation for both OpenBSD and NetBSD.
I specifically address solutions to performance
issues and mechanism design with an eye toward more
resources being isolated in the future.