Linux-man Archive on lore.kernel.org
 help / color / Atom feed
From: Jann Horn <jannh@google.com>
To: "Theodore Y. Ts'o" <tytso@mit.edu>
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 21:24:33 +0100
Message-ID: <CAG48ez3K6g7NSFmeuw-4paqPQTDYmNkZ-nVvufk25EB+Us850w@mail.gmail.com> (raw)
In-Reply-To: <20191111165800.GD7017@mit.edu>

On Mon, Nov 11, 2019 at 5:58 PM Theodore Y. Ts'o <tytso@mit.edu> wrote:
> 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.

I'm not a big fan, especially if that would only happen on syscall
entry; at the point where you have enough control to perform syscalls,
it probably isn't too difficult to move your ROP stack over to a
legitimate stack.

  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
2019-11-11 20:24         ` Jann Horn [this message]
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

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=CAG48ez3K6g7NSFmeuw-4paqPQTDYmNkZ-nVvufk25EB+Us850w@mail.gmail.com \
    --to=jannh@google.com \
    --cc=adrian@lisas.de \
    --cc=akpm@linux-foundation.org \
    --cc=arnd@arndb.de \
    --cc=avagin@gmail.com \
    --cc=christian.brauner@ubuntu.com \
    --cc=christian@brauner.io \
    --cc=dhowells@redhat.com \
    --cc=fweimer@redhat.com \
    --cc=keescook@chromium.org \
    --cc=linux-api@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-man@vger.kernel.org \
    --cc=mingo@elte.hu \
    --cc=mtk.manpages@gmail.com \
    --cc=oleg@redhat.com \
    --cc=tytso@mit.edu \
    --cc=xemul@virtuozzo.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-man Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-man/0 linux-man/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-man linux-man/ https://lore.kernel.org/linux-man \
		linux-man@vger.kernel.org
	public-inbox-index linux-man

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-man


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git