From: tycho@tycho.ws (Tycho Andersen)
To: linux-security-module@vger.kernel.org
Subject: arm64 physmap (was Re: [kernel-hardening] [PATCH 4/6] Protectable Memory)
Date: Wed, 14 Feb 2018 15:13:28 -0700 [thread overview]
Message-ID: <20180214221328.glbrdib3wumve53z@cisco> (raw)
In-Reply-To: <CAGXu5j+zkFx+1Dn908iqaTV-yP7Wk_rMXZRvXN32h+i_oAcy6w@mail.gmail.com>
On Wed, Feb 14, 2018 at 11:48:38AM -0800, Kees Cook wrote:
> On Wed, Feb 14, 2018 at 11:06 AM, Laura Abbott <labbott@redhat.com> wrote:
> > fixed. Modules yes are not fully protected. The conclusion from past
> > experience has been that we cannot safely break down larger page sizes
> > at runtime like x86 does. We could theoretically
> > add support for fixing up the alias if PAGE_POISONING is enabled but
> > I don't know who would actually use that in production. Performance
> > is very poor at that point.
>
> XPFO forces 4K pages on the physmap[1] for similar reasons. I have no
> doubt about performance changes, but I'd be curious to see real
> numbers. Did anyone do benchmarks on just the huge/4K change? (Without
> also the XPFO overhead?)
>
> If this, XPFO, and PAGE_POISONING all need it, I think we have to
> start a closer investigation. :)
I haven't but it shouldn't be too hard. What benchmarks are you
thinking?
Tycho
--
To unsubscribe from this list: send the line "unsubscribe linux-security-module" in
the body of a message to majordomo at vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2018-02-14 22:13 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-24 17:56 [RFC PATCH v11 0/6] mm: security: ro protection for dynamic data Igor Stoppa
2018-01-24 17:56 ` [PATCH 1/6] genalloc: track beginning of allocations Igor Stoppa
2018-01-24 17:56 ` [PATCH 2/6] genalloc: selftest Igor Stoppa
2018-01-24 17:56 ` [PATCH 3/6] struct page: add field for vm_struct Igor Stoppa
2018-01-24 17:56 ` [PATCH 4/6] Protectable Memory Igor Stoppa
2018-01-24 19:10 ` [kernel-hardening] " Jann Horn
2018-01-25 11:59 ` Igor Stoppa
2018-01-25 15:14 ` Boris Lukashev
2018-01-25 15:38 ` Jerome Glisse
2018-01-26 12:28 ` Igor Stoppa
2018-01-26 16:36 ` Boris Lukashev
2018-01-30 13:46 ` Igor Stoppa
2018-01-26 5:35 ` Matthew Wilcox
2018-01-26 11:46 ` Igor Stoppa
2018-02-02 18:39 ` Christopher Lameter
2018-02-03 15:38 ` Igor Stoppa
2018-02-03 19:57 ` Igor Stoppa
2018-02-03 20:12 ` Boris Lukashev
2018-02-03 20:32 ` Igor Stoppa
2018-02-03 22:29 ` Boris Lukashev
2018-02-04 15:05 ` Igor Stoppa
2018-02-12 23:27 ` Kees Cook
2018-02-13 0:40 ` Laura Abbott
2018-02-13 1:25 ` Kees Cook
2018-02-13 3:39 ` Jann Horn
2018-02-13 16:09 ` Laura Abbott
2018-02-13 21:43 ` Kees Cook
2018-02-14 19:06 ` arm64 physmap (was Re: [kernel-hardening] [PATCH 4/6] Protectable Memory) Laura Abbott
2018-02-14 19:28 ` Ard Biesheuvel
2018-02-14 20:13 ` Laura Abbott
2018-02-14 19:29 ` Kees Cook
2018-02-14 19:35 ` Kees Cook
2018-02-20 16:28 ` Igor Stoppa
2018-02-21 22:22 ` Kees Cook
2018-02-14 19:48 ` Kees Cook
2018-02-14 22:13 ` Tycho Andersen [this message]
2018-02-14 22:27 ` Kees Cook
[not found] ` <5a83024c.64369d0a.a1e94.cdd6SMTPIN_ADDED_BROKEN@mx.google.com>
2018-02-13 18:10 ` [kernel-hardening] [PATCH 4/6] Protectable Memory Laura Abbott
2018-02-20 17:16 ` Igor Stoppa
2018-02-21 22:37 ` Kees Cook
2018-02-05 15:40 ` Christopher Lameter
2018-02-09 11:17 ` Igor Stoppa
2018-01-26 19:41 ` Igor Stoppa
2018-01-24 17:56 ` [PATCH 5/6] Documentation for Pmalloc Igor Stoppa
2018-01-24 19:14 ` Ralph Campbell
2018-01-25 7:53 ` Igor Stoppa
2018-01-24 17:56 ` [PATCH 6/6] Pmalloc: self-test Igor Stoppa
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=20180214221328.glbrdib3wumve53z@cisco \
--to=tycho@tycho.ws \
--cc=linux-security-module@vger.kernel.org \
/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 NNTP newsgroup(s).