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From: Jonathan McDowell <noodles@fb.com>
To: Borislav Petkov <bp@alien8.de>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	James Morris <jmorris@namei.org>, Ingo Molnar <mingo@redhat.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Dmitry Kasatkin <dmitry.kasatkin@gmail.com>,
	"x86@kernel.org" <x86@kernel.org>,
	Mimi Zohar <zohar@linux.ibm.com>,
	"Serge E. Hallyn" <serge@hallyn.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-integrity@vger.kernel.org"
	<linux-integrity@vger.kernel.org>,
	"linux-security-module@vger.kernel.org" 
	<linux-security-module@vger.kernel.org>
Subject: Re: [PATCH v2] Carry forward IMA measurement log on kexec on x86_64
Date: Tue, 10 May 2022 08:02:50 +0000	[thread overview]
Message-ID: <YnocKdTRRHVIpf4t@noodles-fedora.dhcp.thefacebook.com> (raw)
In-Reply-To: <YnluLIEN9HH+QvrD@zn.tnic>

On Mon, May 09, 2022 at 09:40:28PM +0200, Borislav Petkov wrote:
> On Mon, May 09, 2022 at 06:41:17PM +0000, Jonathan McDowell wrote:
> > I'm not tied to setup_data but given the concerns I raise above with
> > device tree on x86 and the need to handle this in the kernel it seemed
> > like a reasonable first approach. You seem to be saying it's not and
> > either adding the device tree infrastructure or doing a command line
> > hack would be preferable?
> 
> All I'm doing is asking more questions to make you give more details as
> to why you wanna do it this way. I'll take a detailed look tomorrow but
> it looks ok from a quick glance.

That's reasonable, thanks for taking the time to do so. I realised
another problem with the command line approach is that this is a flow
involving attestation and potentially signing across the kexec boundary,
so if the command line changes every time due to the memory address we
pass the IMA buffer in then we have to recalculate the expected PCR etc
values for every kexec after we've done the user space buffer
allocation, rather than being able to do so once + offline in advance
for a particular kexec across multiple machines.

J.

  reply	other threads:[~2022-05-10  8:03 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-22 13:50 [PATCH] " Jonathan McDowell
2022-04-25 16:29 ` Mimi Zohar
2022-04-26 12:08   ` Jonathan McDowell
2022-04-26 13:49     ` Mimi Zohar
2022-04-26 16:48       ` Jonathan McDowell
2022-04-26 18:10         ` Mimi Zohar
2022-04-28 10:40           ` Jonathan McDowell
2022-04-28 12:25             ` Mimi Zohar
2022-04-26 16:52 ` [PATCH v2] " Jonathan McDowell
2022-04-29 21:30   ` Mimi Zohar
2022-05-03 12:02     ` Jonathan McDowell
2022-05-04 13:49       ` Mimi Zohar
2022-05-09 10:40   ` Jonathan McDowell
2022-05-09 11:25     ` Boris Petkov
2022-05-09 17:46       ` Jonathan McDowell
2022-05-09 18:09         ` Borislav Petkov
2022-05-09 18:41           ` Jonathan McDowell
2022-05-09 19:40             ` Borislav Petkov
2022-05-10  8:02               ` Jonathan McDowell [this message]
2022-05-10 10:46   ` Borislav Petkov
2022-05-11  9:59   ` [PATCH v3] x86/kexec: Carry forward IMA measurement log on kexec Jonathan McDowell
2022-05-11 17:53     ` Mimi Zohar
2022-05-11 17:56       ` Borislav Petkov
2022-05-11 19:12         ` Mimi Zohar
2022-05-12  1:34       ` Mimi Zohar
2022-05-12 16:25     ` [PATCH v4] " Jonathan McDowell
2022-05-13 17:19       ` Lakshmi Ramasubramanian
2022-05-16 15:15         ` Jonathan McDowell
2022-05-17 17:19           ` Lakshmi Ramasubramanian
2022-05-18 10:42             ` Jonathan McDowell
2022-05-18 14:43       ` Mimi Zohar
2022-05-30  8:40         ` Jonathan McDowell
2022-06-03 15:55           ` Dave Hansen
2022-06-03 15:55             ` Dave Hansen
2022-06-06  3:54             ` Baoquan He
2022-06-06  3:54               ` Baoquan He
2022-06-06  4:06       ` Baoquan He
2022-06-10  9:52         ` Jonathan McDowell
2022-06-10  9:52           ` Jonathan McDowell
2022-06-13 10:30       ` [PATCH v5] " Jonathan McDowell
2022-06-13 10:30         ` Jonathan McDowell
2022-06-13 21:01         ` Mimi Zohar
2022-06-13 21:01           ` Mimi Zohar
2022-06-16  2:59           ` Baoquan He
2022-06-16  2:59             ` Baoquan He
2022-06-16 15:30         ` [PATCH v6] " Jonathan McDowell
2022-06-16 15:30           ` Jonathan McDowell
2022-06-30  8:36           ` [PATCH v7] " Jonathan McDowell
2022-06-30  8:36             ` Jonathan McDowell
2022-06-30 11:54             ` Mimi Zohar
2022-06-30 11:54               ` Mimi Zohar
2022-07-04  2:36             ` Baoquan He
2022-07-04  2:36               ` Baoquan He
2022-06-27 11:56 ` [tip: x86/kdump] " tip-bot2 for Jonathan McDowell
2022-07-01 14:37 ` tip-bot2 for Jonathan McDowell
2022-07-07 16:52 ` [tip: x86/boot] " tip-bot2 for Jonathan McDowell
2022-07-07 17:37   ` Jonathan McDowell
2022-07-07 17:50     ` Dave Hansen

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