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From: "Theodore Y. Ts'o" <tytso@mit.edu>
To: Jann Horn <jannh@google.com>
Cc: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>,
	Christian Brauner <christian.brauner@ubuntu.com>,
	Florian Weimer <fweimer@redhat.com>,
	Christian Brauner <christian@brauner.io>,
	lkml <linux-kernel@vger.kernel.org>,
	linux-man <linux-man@vger.kernel.org>,
	Kees Cook <keescook@chromium.org>,
	Oleg Nesterov <oleg@redhat.com>, Arnd Bergmann <arnd@arndb.de>,
	David Howells <dhowells@redhat.com>,
	Pavel Emelyanov <xemul@virtuozzo.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Adrian Reber <adrian@lisas.de>, Andrei Vagin <avagin@gmail.com>,
	Linux API <linux-api@vger.kernel.org>,
	Ingo Molnar <mingo@elte.hu>
Subject: Re: For review: documentation of clone3() system call
Date: Mon, 11 Nov 2019 11:58:00 -0500
Message-ID: <20191111165800.GD7017@mit.edu> (raw)
In-Reply-To: <CAG48ez2of684J6suPZpko7JFV6hg5KQsrP0KAn8B8-C3PM9OfQ@mail.gmail.com>

On Mon, Nov 11, 2019 at 03:55:35PM +0100, Jann Horn wrote:
> Not on Linux, but on OpenBSD, they do use MAP_STACK now AFAIK; this
> was announced here:
> <http://openbsd-archive.7691.n7.nabble.com/stack-register-checking-td338238.html>.
> Basically they periodically check whether the userspace stack pointer
> points into a MAP_STACK region, and if not, they kill the process. So
> even if it's a no-op on Linux...

Hmm, is that something we should do in Linux?  Even if we only check
on syscall entry, which should be pretty inexpensive, it seems like it
would be very effective in protecting various ROP techniques.

      	      		   	      	      - Ted

  reply index

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-25 16:59 Michael Kerrisk (man-pages)
2019-10-25 17:07 ` Christian Brauner
2019-11-07 12:26   ` Michael Kerrisk (man-pages)
2019-10-26  2:28 ` G. Branden Robinson
2019-10-31  6:06   ` Michael Kerrisk (man-pages)
2019-10-28 15:12 ` Jann Horn
2019-10-28 17:21   ` Christian Brauner
2019-10-28 19:09     ` Jann Horn
2019-10-29 11:27       ` Christian Brauner
2019-10-29 14:26         ` Christian Brauner
2019-10-29 14:36           ` Florian Weimer
2019-10-29 16:04             ` Christian Brauner
2019-10-29 15:20           ` Jann Horn
2019-10-29 16:05             ` Christian Brauner
2019-11-07 15:19 ` Christian Brauner
2019-11-07 16:10   ` Florian Weimer
2019-11-09  8:09   ` Michael Kerrisk (man-pages)
2019-11-09 16:53     ` Christian Brauner
2019-11-11  9:02       ` Michael Kerrisk (man-pages)
2019-11-11 11:36         ` Christian Brauner
2019-11-11 19:56           ` Michael Kerrisk (man-pages)
2019-11-11 14:55     ` Jann Horn
2019-11-11 16:58       ` Theodore Y. Ts'o [this message]
2019-11-11 20:24         ` Jann Horn
2019-11-12 23:03           ` Kees Cook
2019-11-14 12:15       ` Michael Kerrisk (man-pages)
2019-11-14 12:29         ` Christian Brauner
2019-11-11 15:03 ` Florian Weimer
2019-11-11 15:15   ` Jann Horn
2019-11-11 15:20     ` Florian Weimer

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