From: Matthew Garrett <matthew.garrett@nebula.com>
To: Kees Cook <keescook@chromium.org>
Cc: Lenny Szubowicz <lszubowi@redhat.com>,
LKML <linux-kernel@vger.kernel.org>,
"linux-efi@vger.kernel.org" <linux-efi@vger.kernel.org>,
Josh Boyer <jwboyer@redhat.com>
Subject: Re: [PATCH 0/10] Add additional security checks when module loading is restricted
Date: Wed, 28 Aug 2013 23:12:57 +0000 [thread overview]
Message-ID: <1377731577.27493.11.camel@x230> (raw)
In-Reply-To: <CAGXu5jKQtx1OEn8qT8+LgHL+xFgK_pHGrxtdwFfKT1q3FHhaNg@mail.gmail.com>
On Wed, 2013-08-28 at 16:07 -0700, Kees Cook wrote:
> Strictly speaking, RAM contents are not available via /dev/*mem, even
> to root. However, you can request a suspend image be written, but to
> not enter hibernation. Then modify the image, and request a resume
> from it.
Is that true? Oh, hm - I guess you could do it with uswsusp. Ugh. Now I
wonder what else you can do with uswsusp. Yeah, ok, I think that case
certainly needs handling.
--
Matthew Garrett <matthew.garrett@nebula.com>
WARNING: multiple messages have this Message-ID (diff)
From: Matthew Garrett <matthew.garrett@nebula.com>
To: Kees Cook <keescook@chromium.org>
Cc: Lenny Szubowicz <lszubowi@redhat.com>,
LKML <linux-kernel@vger.kernel.org>,
"linux-efi@vger.kernel.org" <linux-efi@vger.kernel.org>,
Josh Boyer <jwboyer@redhat.com>
Subject: Re: [PATCH 0/10] Add additional security checks when module loading is restricted
Date: Wed, 28 Aug 2013 23:12:57 +0000 [thread overview]
Message-ID: <1377731577.27493.11.camel@x230> (raw)
In-Reply-To: <CAGXu5jKQtx1OEn8qT8+LgHL+xFgK_pHGrxtdwFfKT1q3FHhaNg@mail.gmail.com>
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset="utf-8", Size: 655 bytes --]
On Wed, 2013-08-28 at 16:07 -0700, Kees Cook wrote:
> Strictly speaking, RAM contents are not available via /dev/*mem, even
> to root. However, you can request a suspend image be written, but to
> not enter hibernation. Then modify the image, and request a resume
> from it.
Is that true? Oh, hm - I guess you could do it with uswsusp. Ugh. Now I
wonder what else you can do with uswsusp. Yeah, ok, I think that case
certainly needs handling.
--
Matthew Garrett <matthew.garrett@nebula.com>
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next prev parent reply other threads:[~2013-08-28 23:12 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-19 17:26 [PATCH 0/10] Add additional security checks when module loading is restricted Matthew Garrett
2013-08-19 17:26 ` Matthew Garrett
2013-08-19 17:26 ` [PATCH V2 01/10] Add secure_modules() call Matthew Garrett
[not found] ` <1376933171-9854-2-git-send-email-matthew.garrett-05XSO3Yj/JvQT0dZR+AlfA@public.gmane.org>
2013-08-29 15:01 ` Josh Boyer
2013-08-29 15:01 ` Josh Boyer
2013-08-19 17:26 ` [PATCH V2 03/10] x86: Lock down IO port access when module security is enabled Matthew Garrett
2013-08-19 17:26 ` [PATCH V2 04/10] ACPI: Limit access to custom_method Matthew Garrett
2013-08-19 17:26 ` [PATCH V2 05/10] asus-wmi: Restrict debugfs interface when module loading is restricted Matthew Garrett
[not found] ` <1376933171-9854-1-git-send-email-matthew.garrett-05XSO3Yj/JvQT0dZR+AlfA@public.gmane.org>
2013-08-19 17:26 ` [PATCH V2 02/10] PCI: Lock down BAR access when module security is enabled Matthew Garrett
2013-08-19 17:26 ` Matthew Garrett
2013-08-19 17:26 ` [PATCH V2 06/10] Restrict /dev/mem and /dev/kmem when module loading is restricted Matthew Garrett
2013-08-19 17:26 ` Matthew Garrett
2013-08-19 17:26 ` [PATCH V2 10/10] Add option to automatically enforce module signatures when in Secure Boot mode Matthew Garrett
2013-08-19 17:26 ` Matthew Garrett
2013-08-29 18:37 ` Josh Boyer
[not found] ` <20130829183713.GT20828-dHPIJuKSOV01V+h/cAXI7w8O6CCKKCg3HZ5vskTnxNA@public.gmane.org>
2013-08-30 20:46 ` H. Peter Anvin
2013-08-30 20:46 ` H. Peter Anvin
[not found] ` <522104A6.5000700-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2013-08-30 23:41 ` Josh Boyer
2013-08-30 23:41 ` Josh Boyer
[not found] ` <20130830234133.GR20828-dHPIJuKSOV01V+h/cAXI7w8O6CCKKCg3HZ5vskTnxNA@public.gmane.org>
2013-09-04 10:51 ` joeyli
2013-09-04 10:51 ` joeyli
[not found] ` <1378291877.6380.74.camel-ONCj+Eqt86TasUa73XJKwA@public.gmane.org>
2013-09-04 12:01 ` Josh Boyer
2013-09-04 12:01 ` Josh Boyer
[not found] ` <CA+5PVA4J1mL0o=MHM-D81rcViR+E3JUyGChvHe8P+3+yt3v_qA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-09-04 13:13 ` joeyli
2013-09-04 13:13 ` joeyli
2013-08-28 22:37 ` [PATCH 0/10] Add additional security checks when module loading is restricted Lenny Szubowicz
2013-08-28 22:37 ` Lenny Szubowicz
[not found] ` <1241952070.8587861.1377729463830.JavaMail.root-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-08-28 22:41 ` Matthew Garrett
2013-08-28 22:41 ` Matthew Garrett
2013-08-28 22:58 ` Lenny Szubowicz
2013-08-28 22:58 ` Lenny Szubowicz
[not found] ` <761791749.8594444.1377730692707.JavaMail.root-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-08-28 23:05 ` Matthew Garrett
2013-08-28 23:05 ` Matthew Garrett
2013-08-28 23:07 ` Kees Cook
2013-08-28 23:07 ` Kees Cook
2013-08-28 23:12 ` Matthew Garrett [this message]
2013-08-28 23:12 ` Matthew Garrett
[not found] ` <CAGXu5jKQtx1OEn8qT8+LgHL+xFgK_pHGrxtdwFfKT1q3FHhaNg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-09-02 5:22 ` joeyli
2013-09-02 5:22 ` joeyli
2013-08-19 17:26 ` [PATCH V2 07/10] acpi: Ignore acpi_rsdp kernel parameter " Matthew Garrett
2013-08-19 17:26 ` [PATCH V2 08/10] kexec: Disable at runtime if the kernel enforces module loading restrictions Matthew Garrett
[not found] ` <1376933171-9854-9-git-send-email-matthew.garrett-05XSO3Yj/JvQT0dZR+AlfA@public.gmane.org>
2013-08-29 15:57 ` Lenny Szubowicz
2013-08-29 15:57 ` Lenny Szubowicz
[not found] ` <410604531.9664777.1377791856786.JavaMail.root-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-08-29 18:14 ` Lenny Szubowicz
2013-08-29 18:14 ` Lenny Szubowicz
2013-08-29 18:10 ` Vivek Goyal
2013-08-29 18:10 ` Vivek Goyal
2013-08-19 17:26 ` [PATCH V2 09/10] x86: Restrict MSR access when module loading is restricted Matthew Garrett
2013-08-19 17:34 ` [PATCH 0/10] Add additional security checks " Kees Cook
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