From: "H. Peter Anvin" <hpa@zytor.com>
To: Julien Tinnes <jln@google.com>
Cc: Ingo Molnar <mingo@kernel.org>, Kees Cook <keescook@chromium.org>,
LKML <linux-kernel@vger.kernel.org>,
"kernel-hardening@lists.openwall.com"
<kernel-hardening@lists.openwall.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "x86@kernel.org" <x86@kernel.org>,
Jarkko Sakkinen <jarkko.sakkinen@intel.com>,
Matthew Garrett <mjg@redhat.com>,
Matt Fleming <matt.fleming@intel.com>,
Eric Northup <digitaleric@google.com>,
Dan Rosenberg <drosenberg@vsecurity.com>,
Will Drewry <wad@chromium.org>
Subject: [kernel-hardening] Re: [PATCH 3/3] x86: kernel base offset ASLR
Date: Fri, 05 Apr 2013 15:08:32 -0700 [thread overview]
Message-ID: <515F4B60.60302@zytor.com> (raw)
In-Reply-To: <CAKyRK=h0sDFn6vqdKwmWds4EubqwnqVYG4JgKk=5-EDV7dJ36g@mail.gmail.com>
On 04/05/2013 03:06 PM, Julien Tinnes wrote:
>
> Speaking of IDT, and to capture some off-thread discussion here, we
> should remember that the "SGDT" and "SIDT" instructions aren't
> privileged on x86, so user-land can leak these out without any way for
> the kernel to intercept that.
>
> Adding their own random offsets to these two tables would be very
> useful. This could be done in a later patchset of course.
>
Yes, if the GDT or IDT position is at all correlated to the kernel
position this is pointless.
-hpa
WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@zytor.com>
To: Julien Tinnes <jln@google.com>
Cc: Ingo Molnar <mingo@kernel.org>, Kees Cook <keescook@chromium.org>,
LKML <linux-kernel@vger.kernel.org>,
"kernel-hardening@lists.openwall.com"
<kernel-hardening@lists.openwall.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "x86@kernel.org" <x86@kernel.org>,
Jarkko Sakkinen <jarkko.sakkinen@intel.com>,
Matthew Garrett <mjg@redhat.com>,
Matt Fleming <matt.fleming@intel.com>,
Eric Northup <digitaleric@google.com>,
Dan Rosenberg <drosenberg@vsecurity.com>,
Will Drewry <wad@chromium.org>
Subject: Re: [PATCH 3/3] x86: kernel base offset ASLR
Date: Fri, 05 Apr 2013 15:08:32 -0700 [thread overview]
Message-ID: <515F4B60.60302@zytor.com> (raw)
In-Reply-To: <CAKyRK=h0sDFn6vqdKwmWds4EubqwnqVYG4JgKk=5-EDV7dJ36g@mail.gmail.com>
On 04/05/2013 03:06 PM, Julien Tinnes wrote:
>
> Speaking of IDT, and to capture some off-thread discussion here, we
> should remember that the "SGDT" and "SIDT" instructions aren't
> privileged on x86, so user-land can leak these out without any way for
> the kernel to intercept that.
>
> Adding their own random offsets to these two tables would be very
> useful. This could be done in a later patchset of course.
>
Yes, if the GDT or IDT position is at all correlated to the kernel
position this is pointless.
-hpa
next prev parent reply other threads:[~2013-04-05 22:08 UTC|newest]
Thread overview: 102+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-04 20:07 [kernel-hardening] [PATCH 0/3] kernel ASLR Kees Cook
2013-04-04 20:07 ` Kees Cook
2013-04-04 20:07 ` [kernel-hardening] [PATCH 1/3] x86: routines to choose random kernel base offset Kees Cook
2013-04-04 20:07 ` Kees Cook
2013-04-05 7:24 ` [kernel-hardening] " Ingo Molnar
2013-04-05 7:24 ` Ingo Molnar
2013-04-05 7:36 ` [kernel-hardening] " Ingo Molnar
2013-04-05 7:36 ` Ingo Molnar
2013-04-05 18:15 ` [kernel-hardening] " H. Peter Anvin
2013-04-05 18:15 ` H. Peter Anvin
2013-04-08 5:35 ` [kernel-hardening] " Hasinoliva MIARIMANJATO
2013-04-08 5:35 ` Hasinoliva MIARIMANJATO
2013-04-04 20:07 ` [kernel-hardening] [PATCH 2/3] x86: build reloc tool for both 64 and 32 bit Kees Cook
2013-04-04 20:07 ` Kees Cook
2013-04-05 7:13 ` [kernel-hardening] " Ingo Molnar
2013-04-05 7:13 ` Ingo Molnar
2013-04-04 20:07 ` [kernel-hardening] [PATCH 3/3] x86: kernel base offset ASLR Kees Cook
2013-04-04 20:07 ` Kees Cook
2013-04-04 20:12 ` [kernel-hardening] " H. Peter Anvin
2013-04-04 20:12 ` H. Peter Anvin
2013-04-04 20:19 ` [kernel-hardening] " Julien Tinnes
2013-04-04 20:19 ` Julien Tinnes
2013-04-04 20:23 ` [kernel-hardening] " Julien Tinnes
2013-04-04 20:23 ` Julien Tinnes
2013-04-04 20:27 ` [kernel-hardening] " H. Peter Anvin
2013-04-04 20:27 ` H. Peter Anvin
2013-04-04 20:48 ` [kernel-hardening] " Julien Tinnes
2013-04-04 20:48 ` Julien Tinnes
2013-04-05 7:05 ` [kernel-hardening] " Ingo Molnar
2013-04-05 7:05 ` Ingo Molnar
2013-04-04 20:54 ` [kernel-hardening] " Kees Cook
2013-04-04 20:54 ` Kees Cook
2013-04-04 20:58 ` [kernel-hardening] " H. Peter Anvin
2013-04-04 20:58 ` H. Peter Anvin
2013-04-04 21:00 ` [kernel-hardening] " Kees Cook
2013-04-04 21:00 ` Kees Cook
2013-04-04 21:01 ` [kernel-hardening] " H. Peter Anvin
2013-04-04 21:01 ` H. Peter Anvin
2013-04-04 21:04 ` [kernel-hardening] " Eric Northup
2013-04-04 21:04 ` Eric Northup
2013-04-04 21:06 ` [kernel-hardening] " Kees Cook
2013-04-04 21:06 ` Kees Cook
2013-04-04 21:00 ` [kernel-hardening] " Julien Tinnes
2013-04-04 21:00 ` Julien Tinnes
2013-04-04 21:01 ` [kernel-hardening] " Eric Northup
2013-04-04 21:01 ` Eric Northup
2013-04-05 7:55 ` [kernel-hardening] " Ingo Molnar
2013-04-05 7:55 ` Ingo Molnar
2013-04-04 20:21 ` [kernel-hardening] " H. Peter Anvin
2013-04-04 20:21 ` H. Peter Anvin
2013-04-04 20:47 ` [kernel-hardening] " Eric Northup
2013-04-04 20:47 ` Eric Northup
2013-04-05 1:08 ` [kernel-hardening] " H. Peter Anvin
2013-04-05 1:08 ` H. Peter Anvin
2013-04-05 8:04 ` [kernel-hardening] " Ingo Molnar
2013-04-05 8:04 ` Ingo Molnar
2013-04-05 15:30 ` [kernel-hardening] " H. Peter Anvin
2013-04-05 15:30 ` H. Peter Anvin
2013-04-08 11:58 ` [kernel-hardening] " Ingo Molnar
2013-04-08 11:58 ` Ingo Molnar
2013-04-08 14:58 ` [kernel-hardening] " H. Peter Anvin
2013-04-08 14:58 ` H. Peter Anvin
2013-04-05 18:17 ` [kernel-hardening] " H. Peter Anvin
2013-04-05 18:17 ` H. Peter Anvin
2013-04-05 20:01 ` [kernel-hardening] " Yinghai Lu
2013-04-05 20:01 ` Yinghai Lu
2013-04-05 20:05 ` [kernel-hardening] " H. Peter Anvin
2013-04-05 20:05 ` H. Peter Anvin
2013-04-05 20:19 ` [kernel-hardening] " Yinghai Lu
2013-04-05 20:19 ` Yinghai Lu
2013-04-05 20:29 ` [kernel-hardening] " H. Peter Anvin
2013-04-05 20:29 ` H. Peter Anvin
2013-04-05 7:11 ` [kernel-hardening] " Ingo Molnar
2013-04-05 7:11 ` Ingo Molnar
2013-04-05 22:06 ` [kernel-hardening] " Julien Tinnes
2013-04-05 22:06 ` Julien Tinnes
2013-04-05 22:08 ` H. Peter Anvin [this message]
2013-04-05 22:08 ` H. Peter Anvin
2013-04-05 22:13 ` [kernel-hardening] " Julien Tinnes
2013-04-05 22:13 ` Julien Tinnes
2013-04-05 7:34 ` [kernel-hardening] " Ingo Molnar
2013-04-05 7:34 ` Ingo Molnar
2013-04-05 12:12 ` [kernel-hardening] " Jiri Kosina
2013-04-05 12:12 ` Jiri Kosina
2013-04-05 14:49 ` [kernel-hardening] " Borislav Petkov
2013-04-05 14:49 ` Borislav Petkov
2013-04-05 20:19 ` [kernel-hardening] " Julien Tinnes
2013-04-05 20:19 ` Julien Tinnes
2013-04-05 20:43 ` [kernel-hardening] " Borislav Petkov
2013-04-05 20:43 ` Borislav Petkov
2013-04-05 23:18 ` [kernel-hardening] " Kees Cook
2013-04-05 23:18 ` Kees Cook
2013-04-06 10:10 ` [kernel-hardening] " Borislav Petkov
2013-04-06 10:10 ` Borislav Petkov
2013-04-08 5:34 ` [kernel-hardening] " Hasinoliva MIARIMANJATO
2013-04-08 12:13 ` Ingo Molnar
2013-04-08 12:13 ` Ingo Molnar
2013-04-08 5:34 ` [kernel-hardening] [PATCH 0/3] kernel ASLR Hasinoliva MIARIMANJATO
2013-04-11 20:52 ` [kernel-hardening] " H. Peter Anvin
2013-04-11 20:52 ` H. Peter Anvin
2013-04-11 21:28 ` [kernel-hardening] " Kees Cook
2013-04-11 21:28 ` Kees Cook
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