From: Joseph Myers <joseph@codesourcery.com>
To: Jeff Law <law@redhat.com>
Cc: gcc-patches <gcc-patches@gcc.gnu.org>
Subject: Re: RFC: stack/heap collision vulnerability and mitigation with GCC
Date: Mon, 19 Jun 2017 17:51:00 -0000 [thread overview]
Message-ID: <alpine.DEB.2.20.1706191744230.27712@digraph.polyomino.org.uk> (raw)
In-Reply-To: <bef46e40-8004-0f80-4928-ad0795eb76ba@redhat.com>
On Mon, 19 Jun 2017, Jeff Law wrote:
> A key point to remember is that you can never have an allocation
> (potentially using more than one allocation site) which is larger than a
> page without probing the page.
There's a platform ABI issue here. At least some kernel fixes for these
stack issues, as I understand it, increase the size of the stack guard to
more than a single page. It would be possible to define the ABI to
require such a larger guard for protection and so reduce the number of
(non-alloca/VLA-using) functions that need probes generated, depending on
whether a goal is to achieve security on kernels without such a fix.
(Thinking in terms of how to get to enabling such probes by default.)
--
Joseph S. Myers
joseph@codesourcery.com
next prev parent reply other threads:[~2017-06-19 17:51 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-19 17:07 Jeff Law
2017-06-19 17:29 ` Jakub Jelinek
2017-06-19 17:45 ` Jeff Law
2017-06-19 17:51 ` Jakub Jelinek
2017-06-19 21:51 ` Jeff Law
2017-06-20 8:03 ` Uros Bizjak
2017-06-20 10:18 ` Richard Biener
2017-06-20 11:10 ` Uros Bizjak
2017-06-20 12:13 ` Florian Weimer
2017-06-20 12:17 ` Uros Bizjak
2017-06-20 12:20 ` Uros Bizjak
2017-06-20 12:27 ` Richard Biener
2017-06-20 21:57 ` Jeff Law
2017-06-20 15:59 ` Jeff Law
2017-06-19 18:00 ` Richard Biener
2017-06-19 18:02 ` Richard Biener
2017-06-19 18:15 ` Florian Weimer
2017-06-19 21:57 ` Jeff Law
2017-06-19 22:08 ` Jeff Law
2017-06-20 7:50 ` Eric Botcazou
2017-06-19 17:51 ` Joseph Myers [this message]
2017-06-19 17:55 ` Jakub Jelinek
2017-06-19 18:21 ` Florian Weimer
2017-06-19 21:56 ` Joseph Myers
2017-06-19 22:05 ` Jeff Law
2017-06-19 22:10 ` Florian Weimer
2017-06-19 19:05 ` Jeff Law
2017-06-19 19:45 ` Jakub Jelinek
2017-06-19 21:41 ` Jeff Law
2017-06-20 8:27 ` Richard Earnshaw (lists)
2017-06-20 15:50 ` Jeff Law
2017-06-19 18:12 ` Richard Kenner
2017-06-19 22:05 ` Jeff Law
2017-06-19 22:07 ` Richard Kenner
2017-06-20 8:21 ` Eric Botcazou
2017-06-20 15:50 ` Jeff Law
2017-06-20 19:48 ` Jakub Jelinek
2017-06-20 20:37 ` Eric Botcazou
2017-06-20 20:46 ` Jeff Law
2017-06-20 8:17 ` Eric Botcazou
2017-06-20 21:52 ` Jeff Law
2017-06-20 22:20 ` Eric Botcazou
2017-06-21 17:31 ` Jeff Law
2017-06-21 19:07 ` Florian Weimer
2017-06-21 7:56 ` Andreas Schwab
2017-06-20 9:27 ` Richard Earnshaw (lists)
2017-06-20 21:39 ` Jeff Law
2017-06-21 8:41 ` Richard Earnshaw (lists)
2017-06-21 17:25 ` Jeff Law
2017-06-22 9:53 ` Richard Earnshaw (lists)
2017-06-22 15:30 ` Jeff Law
2017-06-22 16:07 ` Szabolcs Nagy
2017-06-22 16:15 ` Jeff Law
2017-06-28 6:45 ` Florian Weimer
2017-07-13 23:21 ` Jeff Law
2017-07-18 19:54 ` Florian Weimer
2017-06-20 23:22 Wilco Dijkstra
2017-06-21 8:34 ` Richard Earnshaw (lists)
2017-06-21 8:44 ` Andreas Schwab
2017-06-21 8:46 ` Richard Earnshaw (lists)
2017-06-21 8:46 ` Richard Earnshaw (lists)
2017-06-21 9:03 ` Wilco Dijkstra
2017-06-21 17:05 ` Jeff Law
2017-06-21 17:47 ` Wilco Dijkstra
2017-06-22 16:10 ` Jeff Law
2017-06-22 22:57 ` Wilco Dijkstra
Reply instructions:
You may reply publicly 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=alpine.DEB.2.20.1706191744230.27712@digraph.polyomino.org.uk \
--to=joseph@codesourcery.com \
--cc=gcc-patches@gcc.gnu.org \
--cc=law@redhat.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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).