From: "Daniel P. Smith" <dpsmith@apertussolutions.com> To: Matthew Garrett <mjg59@srcf.ucam.org>, Ross Philipson <ross.philipson@oracle.com> Cc: linux-kernel@vger.kernel.org, x86@kernel.org, linux-integrity@vger.kernel.org, linux-doc@vger.kernel.org, linux-crypto@vger.kernel.org, iommu@lists.linux-foundation.org, kexec@lists.infradead.org, linux-efi@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, ardb@kernel.org, James.Bottomley@hansenpartnership.com, luto@amacapital.net, nivedita@alum.mit.edu, kanth.ghatraju@oracle.com, trenchboot-devel@googlegroups.com Subject: Re: [PATCH v6 04/14] x86: Secure Launch Resource Table header file Date: Mon, 15 May 2023 17:15:15 -0400 [thread overview] Message-ID: <30d5891d-4747-8d67-2667-ff07628740bd@apertussolutions.com> (raw) In-Reply-To: <20230512105554.GB14461@srcf.ucam.org> On 5/12/23 06:55, Matthew Garrett wrote: > On Thu, May 04, 2023 at 02:50:13PM +0000, Ross Philipson wrote: > >> +#define SLR_TABLE_MAGIC 0x4452544d > > From convention I'd expect this to be 0x534c5254, but not really an > issue. Apologies, but which convention? >> +/* SLR defined bootloaders */ >> +#define SLR_BOOTLOADER_INVALID 0 >> +#define SLR_BOOTLOADER_GRUB 1 > > Oof. Having the kernel know about bootloaders has not worked out super > well for us in the past. If someone writes a new bootloader, are they > unable to Secure Launch any existing kernels? The pragmatic thing for > them to do would be to just pretend they're grub, which kind of defeats > the point of having this definition... Actually, this is not for making the kernel know about bootloaders. This is dealing with the challenge created when the preamble was split for efi-stub, and similar use cases, where what sets up the preamble, ie. the bootloader, is separate from what invokes the dynamic launch, ie. the DLE handler. The reality is that even in the simplest implementation of the DLE handler, a remnant of GRUB for call back from efi-stub, there is information that is needed to cross the gap. >> +} __packed; > > Random nit - why are they all packed? Are there circumstances where two > pieces of code with different assumptions about alignment will be > looking at a single instance of a table? It doesn't seem likely we're > going to be doing DRTM in a 32-bit firmware environment while launching > a 64-bit kernel? We wrote the TrenchBoot Secure Launch general spec [1] with as much forethought as possible for the target environments. Specifically, the desire is to have a common approach for x86 (Intel and AMD), Arm, and perhaps down the road the POWER arch. In particular, I do not believe there is anything in the Arm DRTM beta spec that prohibits a mixed 32/64 bit environment. In the end it is better to for the spec to be safe for those environments then having to make changes to the spec later down the road. [1] https://trenchboot.org/specifications/Secure_Launch/ v/r, dps
WARNING: multiple messages have this Message-ID (diff)
From: "Daniel P. Smith" <dpsmith@apertussolutions.com> To: Matthew Garrett <mjg59@srcf.ucam.org>, Ross Philipson <ross.philipson@oracle.com> Cc: linux-kernel@vger.kernel.org, x86@kernel.org, linux-integrity@vger.kernel.org, linux-doc@vger.kernel.org, linux-crypto@vger.kernel.org, iommu@lists.linux-foundation.org, kexec@lists.infradead.org, linux-efi@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, ardb@kernel.org, James.Bottomley@hansenpartnership.com, luto@amacapital.net, nivedita@alum.mit.edu, kanth.ghatraju@oracle.com, trenchboot-devel@googlegroups.com Subject: Re: [PATCH v6 04/14] x86: Secure Launch Resource Table header file Date: Mon, 15 May 2023 17:15:15 -0400 [thread overview] Message-ID: <30d5891d-4747-8d67-2667-ff07628740bd@apertussolutions.com> (raw) In-Reply-To: <20230512105554.GB14461@srcf.ucam.org> On 5/12/23 06:55, Matthew Garrett wrote: > On Thu, May 04, 2023 at 02:50:13PM +0000, Ross Philipson wrote: > >> +#define SLR_TABLE_MAGIC 0x4452544d > > From convention I'd expect this to be 0x534c5254, but not really an > issue. Apologies, but which convention? >> +/* SLR defined bootloaders */ >> +#define SLR_BOOTLOADER_INVALID 0 >> +#define SLR_BOOTLOADER_GRUB 1 > > Oof. Having the kernel know about bootloaders has not worked out super > well for us in the past. If someone writes a new bootloader, are they > unable to Secure Launch any existing kernels? The pragmatic thing for > them to do would be to just pretend they're grub, which kind of defeats > the point of having this definition... Actually, this is not for making the kernel know about bootloaders. This is dealing with the challenge created when the preamble was split for efi-stub, and similar use cases, where what sets up the preamble, ie. the bootloader, is separate from what invokes the dynamic launch, ie. the DLE handler. The reality is that even in the simplest implementation of the DLE handler, a remnant of GRUB for call back from efi-stub, there is information that is needed to cross the gap. >> +} __packed; > > Random nit - why are they all packed? Are there circumstances where two > pieces of code with different assumptions about alignment will be > looking at a single instance of a table? It doesn't seem likely we're > going to be doing DRTM in a 32-bit firmware environment while launching > a 64-bit kernel? We wrote the TrenchBoot Secure Launch general spec [1] with as much forethought as possible for the target environments. Specifically, the desire is to have a common approach for x86 (Intel and AMD), Arm, and perhaps down the road the POWER arch. In particular, I do not believe there is anything in the Arm DRTM beta spec that prohibits a mixed 32/64 bit environment. In the end it is better to for the spec to be safe for those environments then having to make changes to the spec later down the road. [1] https://trenchboot.org/specifications/Secure_Launch/ v/r, dps _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec
next prev parent reply other threads:[~2023-05-15 21:16 UTC|newest] Thread overview: 200+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-05-04 14:50 [PATCH v6 00/14] x86: Trenchboot secure dynamic launch Linux kernel support Ross Philipson 2023-05-04 14:50 ` Ross Philipson 2023-05-04 14:50 ` [PATCH v6 01/14] x86/boot: Place kernel_info at a fixed offset Ross Philipson 2023-05-04 14:50 ` Ross Philipson 2023-05-04 14:50 ` [PATCH v6 02/14] Documentation/x86: Secure Launch kernel documentation Ross Philipson 2023-05-04 14:50 ` Ross Philipson 2023-05-05 16:19 ` Simon Horman 2023-05-05 16:19 ` Simon Horman 2023-05-05 17:32 ` Ross Philipson 2023-05-05 17:32 ` Ross Philipson 2023-05-06 8:48 ` Bagas Sanjaya 2023-05-06 8:48 ` Bagas Sanjaya 2023-05-10 15:41 ` Ross Philipson 2023-05-10 15:41 ` Ross Philipson 2023-05-12 10:47 ` Matthew Garrett 2023-05-12 10:47 ` Matthew Garrett 2023-06-16 16:44 ` Daniel P. Smith 2023-06-16 16:44 ` Daniel P. Smith 2023-06-16 16:54 ` Matthew Garrett 2023-06-16 16:54 ` Matthew Garrett 2023-06-16 18:21 ` Daniel P. Smith 2023-06-16 18:21 ` Daniel P. Smith 2023-05-12 13:19 ` Thomas Gleixner 2023-05-12 13:19 ` Thomas Gleixner 2023-05-04 14:50 ` [PATCH v6 03/14] x86: Secure Launch Kconfig Ross Philipson 2023-05-04 14:50 ` Ross Philipson 2023-05-04 14:50 ` [PATCH v6 04/14] x86: Secure Launch Resource Table header file Ross Philipson 2023-05-04 14:50 ` Ross Philipson 2023-05-05 16:22 ` Simon Horman 2023-05-05 16:22 ` Simon Horman 2023-05-05 17:34 ` Ross Philipson 2023-05-05 17:34 ` Ross Philipson 2023-05-10 23:04 ` Jarkko Sakkinen 2023-05-10 23:04 ` Jarkko Sakkinen 2023-05-15 20:58 ` Daniel P. Smith 2023-05-15 20:58 ` Daniel P. Smith 2023-05-12 10:55 ` Matthew Garrett 2023-05-12 10:55 ` Matthew Garrett 2023-05-15 21:15 ` Daniel P. Smith [this message] 2023-05-15 21:15 ` Daniel P. Smith 2023-05-15 21:22 ` Matthew Garrett 2023-05-15 21:22 ` Matthew Garrett 2023-05-16 0:41 ` Daniel P. Smith 2023-05-16 0:41 ` Daniel P. Smith 2023-05-16 1:43 ` Matthew Garrett 2023-05-16 1:43 ` Matthew Garrett 2023-06-16 20:01 ` Daniel P. Smith 2023-06-16 20:01 ` Daniel P. Smith 2023-06-16 20:15 ` Matthew Garrett 2023-06-16 20:15 ` Matthew Garrett 2023-07-07 19:31 ` Daniel P. Smith 2023-07-07 19:31 ` Daniel P. Smith 2023-05-04 14:50 ` [PATCH v6 05/14] x86: Secure Launch main " Ross Philipson 2023-05-04 14:50 ` Ross Philipson 2023-05-05 16:25 ` Simon Horman 2023-05-05 16:25 ` Simon Horman 2023-05-05 17:37 ` Ross Philipson 2023-05-05 17:37 ` Ross Philipson 2023-05-12 11:00 ` Matthew Garrett 2023-05-12 11:00 ` Matthew Garrett 2023-05-12 16:10 ` Ross Philipson 2023-05-12 16:10 ` Ross Philipson 2023-10-31 21:37 ` ross.philipson 2023-10-31 21:37 ` ross.philipson 2023-05-04 14:50 ` [PATCH v6 06/14] x86: Add early SHA support for Secure Launch early measurements Ross Philipson 2023-05-04 14:50 ` Ross Philipson 2023-05-05 16:34 ` Simon Horman 2023-05-05 16:34 ` Simon Horman 2023-05-09 16:09 ` Daniel P. Smith 2023-05-09 16:09 ` Daniel P. Smith 2023-05-10 1:21 ` Eric Biggers 2023-05-10 1:21 ` Eric Biggers 2023-05-10 22:28 ` Jarkko Sakkinen 2023-05-10 22:28 ` Jarkko Sakkinen 2023-05-12 11:04 ` Matthew Garrett 2023-05-12 11:04 ` Matthew Garrett 2023-05-12 11:18 ` Ard Biesheuvel 2023-05-12 11:18 ` Ard Biesheuvel 2023-05-12 11:28 ` Matthew Garrett 2023-05-12 11:28 ` Matthew Garrett 2023-05-12 11:58 ` Ard Biesheuvel 2023-05-12 11:58 ` Ard Biesheuvel 2023-05-12 12:24 ` Andrew Cooper 2023-05-12 12:24 ` Andrew Cooper 2023-05-14 18:18 ` Eric Biggers 2023-05-14 18:18 ` Eric Biggers 2023-05-14 19:11 ` Matthew Garrett 2023-05-14 19:11 ` Matthew Garrett 2023-05-12 13:24 ` Thomas Gleixner 2023-05-12 13:24 ` Thomas Gleixner 2023-05-12 16:13 ` Matthew Garrett 2023-05-12 16:13 ` Matthew Garrett 2023-05-12 18:17 ` Thomas Gleixner 2023-05-12 18:17 ` Thomas Gleixner 2023-05-12 19:12 ` Matthew Garrett 2023-05-12 19:12 ` Matthew Garrett 2023-05-12 19:42 ` Andrew Cooper 2023-05-12 19:42 ` Andrew Cooper 2023-05-15 21:23 ` Daniel P. Smith 2023-05-15 21:23 ` Daniel P. Smith 2023-05-11 3:33 ` Herbert Xu 2023-05-11 3:33 ` Herbert Xu 2023-05-16 0:50 ` Daniel P. Smith 2023-05-16 0:50 ` Daniel P. Smith 2023-05-04 14:50 ` [PATCH v6 07/14] x86: Secure Launch kernel early boot stub Ross Philipson 2023-05-04 14:50 ` Ross Philipson 2023-05-05 17:47 ` Simon Horman 2023-05-05 17:47 ` Simon Horman 2023-05-05 18:58 ` Ross Philipson 2023-05-05 18:58 ` Ross Philipson 2023-05-05 19:46 ` Simon Horman 2023-05-05 19:46 ` Simon Horman 2023-05-12 11:26 ` Matthew Garrett 2023-05-12 11:26 ` Matthew Garrett 2023-05-12 16:17 ` Ross Philipson 2023-05-12 16:17 ` Ross Philipson 2023-05-12 16:27 ` Matthew Garrett 2023-05-12 16:27 ` Matthew Garrett 2023-05-16 1:11 ` Daniel P. Smith 2023-05-16 1:11 ` Daniel P. Smith 2023-05-16 1:45 ` Matthew Garrett 2023-05-16 1:45 ` Matthew Garrett 2023-06-15 18:00 ` Ross Philipson 2023-06-15 18:00 ` Ross Philipson 2023-05-12 18:04 ` Thomas Gleixner 2023-05-12 18:04 ` Thomas Gleixner 2023-05-15 20:13 ` Ross Philipson 2023-05-15 20:13 ` Ross Philipson 2023-09-20 21:40 ` ross.philipson 2023-09-20 21:40 ` ross.philipson 2023-05-04 14:50 ` [PATCH v6 08/14] x86: Secure Launch kernel late " Ross Philipson 2023-05-04 14:50 ` Ross Philipson 2023-05-05 17:52 ` Simon Horman 2023-05-05 17:52 ` Simon Horman 2023-05-05 18:59 ` Ross Philipson 2023-05-05 18:59 ` Ross Philipson 2023-05-10 23:02 ` Jarkko Sakkinen 2023-05-10 23:02 ` Jarkko Sakkinen 2023-05-12 15:58 ` Ross Philipson 2023-05-12 15:58 ` Ross Philipson 2023-05-24 2:55 ` Jarkko Sakkinen 2023-05-24 2:55 ` Jarkko Sakkinen 2023-05-12 15:44 ` Thomas Gleixner 2023-05-12 15:44 ` Thomas Gleixner 2023-05-15 20:06 ` Ross Philipson 2023-05-15 20:06 ` Ross Philipson 2023-05-04 14:50 ` [PATCH v6 09/14] x86: Secure Launch SMP bringup support Ross Philipson 2023-05-04 14:50 ` Ross Philipson 2023-05-05 17:54 ` Simon Horman 2023-05-05 17:54 ` Simon Horman 2023-05-05 18:59 ` Ross Philipson 2023-05-05 18:59 ` Ross Philipson 2023-05-10 22:55 ` Jarkko Sakkinen 2023-05-10 22:55 ` Jarkko Sakkinen 2023-05-11 16:21 ` Ross Philipson 2023-05-11 16:21 ` Ross Philipson 2023-05-12 18:02 ` Thomas Gleixner 2023-05-12 18:02 ` Thomas Gleixner 2023-05-15 20:19 ` Ross Philipson 2023-05-15 20:19 ` Ross Philipson 2023-05-04 14:50 ` [PATCH v6 10/14] kexec: Secure Launch kexec SEXIT support Ross Philipson 2023-05-04 14:50 ` Ross Philipson 2023-05-04 14:50 ` [PATCH v6 11/14] reboot: Secure Launch SEXIT support on reboot paths Ross Philipson 2023-05-04 14:50 ` Ross Philipson 2023-05-12 11:40 ` Matthew Garrett 2023-05-12 11:40 ` Matthew Garrett 2023-05-15 18:16 ` Ross Philipson 2023-05-15 18:16 ` Ross Philipson 2023-05-16 1:23 ` Daniel P. Smith 2023-05-16 1:23 ` Daniel P. Smith 2023-05-04 14:50 ` [PATCH v6 12/14] x86: Secure Launch late initcall platform module Ross Philipson 2023-05-04 14:50 ` Ross Philipson 2023-05-05 19:42 ` Simon Horman 2023-05-05 19:42 ` Simon Horman 2023-05-08 15:07 ` Ross Philipson 2023-05-08 15:07 ` Ross Philipson 2023-05-10 22:39 ` Jarkko Sakkinen 2023-05-10 22:39 ` Jarkko Sakkinen 2023-05-12 15:53 ` Ross Philipson 2023-05-12 15:53 ` Ross Philipson 2023-05-10 22:40 ` Jarkko Sakkinen 2023-05-10 22:40 ` Jarkko Sakkinen 2023-05-12 15:54 ` Ross Philipson 2023-05-12 15:54 ` Ross Philipson 2023-05-04 14:50 ` [PATCH v6 13/14] tpm: Allow locality 2 to be set when initializing the TPM for Secure Launch Ross Philipson 2023-05-04 14:50 ` Ross Philipson 2023-05-12 11:43 ` Matthew Garrett 2023-05-12 11:43 ` Matthew Garrett 2023-05-12 16:22 ` Ross Philipson 2023-05-12 16:22 ` Ross Philipson 2023-05-16 1:37 ` Daniel P. Smith 2023-05-16 1:37 ` Daniel P. Smith 2023-05-04 14:50 ` [PATCH v6 14/14] x86: EFI stub DRTM launch support " Ross Philipson 2023-05-04 14:50 ` Ross Philipson 2023-05-05 8:39 ` [PATCH v6 00/14] x86: Trenchboot secure dynamic launch Linux kernel support Bagas Sanjaya 2023-05-05 8:39 ` Bagas Sanjaya 2023-05-05 15:45 ` Ross Philipson 2023-05-05 15:45 ` Ross Philipson 2023-05-06 7:56 ` Bagas Sanjaya 2023-05-06 7:56 ` Bagas Sanjaya
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