From: Daniel Kiper <daniel.kiper@oracle.com>
To: Arvind Sankar <nivedita@alum.mit.edu>
Cc: Ross Philipson <ross.philipson@oracle.com>,
linux-kernel@vger.kernel.org, x86@kernel.org,
iommu@lists.linux-foundation.org,
linux-integrity@vger.kernel.org, linux-doc@vger.kernel.org,
dpsmith@apertussolutions.com, tglx@linutronix.de,
mingo@redhat.com, bp@alien8.de, hpa@zytor.com,
luto@amacapital.net, trenchboot-devel@googlegroups.com
Subject: Re: [PATCH 07/13] x86: Secure Launch kernel early boot stub
Date: Wed, 21 Oct 2020 17:28:33 +0200 [thread overview]
Message-ID: <20201021152833.b3oys643ckcl5evq@tomti.i.net-space.pl> (raw)
In-Reply-To: <20201019171822.GD2701355@rani.riverdale.lan>
On Mon, Oct 19, 2020 at 01:18:22PM -0400, Arvind Sankar wrote:
> On Mon, Oct 19, 2020 at 04:51:53PM +0200, Daniel Kiper wrote:
> > On Fri, Oct 16, 2020 at 04:51:51PM -0400, Arvind Sankar wrote:
> > > On Thu, Oct 15, 2020 at 08:26:54PM +0200, Daniel Kiper wrote:
> > > >
> > > > I am discussing with Ross the other option. We can create
> > > > .rodata.mle_header section and put it at fixed offset as
> > > > kernel_info is. So, we would have, e.g.:
> > > >
> > > > arch/x86/boot/compressed/vmlinux.lds.S:
> > > > .rodata.kernel_info KERNEL_INFO_OFFSET : {
> > > > *(.rodata.kernel_info)
> > > > }
> > > > ASSERT(ABSOLUTE(kernel_info) == KERNEL_INFO_OFFSET, "kernel_info at bad address!")
> > > >
> > > > .rodata.mle_header MLE_HEADER_OFFSET : {
> > > > *(.rodata.mle_header)
> > > > }
> > > > ASSERT(ABSOLUTE(mle_header) == MLE_HEADER_OFFSET, "mle_header at bad address!")
> > > >
> > > > arch/x86/boot/compressed/sl_stub.S:
> > > > #define mleh_rva(X) (((X) - mle_header) + MLE_HEADER_OFFSET)
> > > >
> > > > .section ".rodata.mle_header", "a"
> > > >
> > > > SYM_DATA_START(mle_header)
> > > > .long 0x9082ac5a /* UUID0 */
> > > > .long 0x74a7476f /* UUID1 */
> > > > .long 0xa2555c0f /* UUID2 */
> > > > .long 0x42b651cb /* UUID3 */
> > > > .long 0x00000034 /* MLE header size */
> > > > .long 0x00020002 /* MLE version 2.2 */
> > > > .long mleh_rva(sl_stub_entry) /* Linear entry point of MLE (virt. address) */
> > > > .long 0x00000000 /* First valid page of MLE */
> > > > .long 0x00000000 /* Offset within binary of first byte of MLE */
> > > > .long 0x00000000 /* Offset within binary of last byte + 1 of MLE */
> > > > .long 0x00000223 /* Bit vector of MLE-supported capabilities */
> > > > .long 0x00000000 /* Starting linear address of command line (unused) */
> > > > .long 0x00000000 /* Ending linear address of command line (unused) */
> > > > SYM_DATA_END(mle_header)
> > > >
> > > > Of course MLE_HEADER_OFFSET has to be defined as a constant somewhere.
> > > > Anyway, is it acceptable?
> >
> > What do you think about my MLE_HEADER_OFFSET and related stuff proposal?
> >
>
> I'm wondering if it would be easier to just allow relocations in these
> special "header" sections. I need to check how easy/hard it is to do
> that without triggering linker warnings.
Ross and I still bouncing some ideas. We came to the conclusion that
putting mle_header into kernel .rodata.kernel_info section or even
arch/x86/boot/compressed/kernel_info.S file would be the easiest thing
to do at this point. Of course I would suggest some renaming too. E.g.
.rodata.kernel_info to .rodata.kernel_headers, etc. Does it make sense
for you?
Daniel
next prev parent reply other threads:[~2020-10-21 15:29 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-24 14:58 [PATCH 00/13] x86: Trenchboot secure dynamic launch Linux kernel support Ross Philipson
2020-09-24 14:58 ` [PATCH 01/13] x86: Secure Launch Kconfig Ross Philipson
2020-09-25 2:08 ` Randy Dunlap
2020-09-25 14:59 ` Ross Philipson
2020-09-24 14:58 ` [PATCH 02/13] x86: Secure Launch main header file Ross Philipson
2020-09-24 14:58 ` [PATCH 03/13] x86: Add early SHA support for Secure Launch early measurements Ross Philipson
2020-09-29 17:26 ` Jason Andryuk
2020-09-24 14:58 ` [PATCH 04/13] x86: Add early TPM TIS/CRB interface support for Secure Launch Ross Philipson
2020-09-24 14:58 ` [PATCH 05/13] x86: Add early TPM1.2/TPM2.0 " Ross Philipson
2020-09-25 5:43 ` Jarkko Sakkinen
2020-09-29 23:47 ` Daniel P. Smith
2020-09-30 3:19 ` Jarkko Sakkinen
2020-09-30 3:24 ` Jarkko Sakkinen
2021-01-20 0:33 ` Daniel P. Smith
2020-09-24 14:58 ` [PATCH 06/13] x86: Add early general TPM " Ross Philipson
2020-09-24 14:58 ` [PATCH 07/13] x86: Secure Launch kernel early boot stub Ross Philipson
2020-09-24 17:38 ` Arvind Sankar
2020-09-25 14:56 ` Ross Philipson
2020-09-25 19:18 ` Arvind Sankar
2020-09-29 14:03 ` Ross Philipson
2020-09-29 14:53 ` Arvind Sankar
2020-10-15 18:26 ` Daniel Kiper
2020-10-16 20:51 ` Arvind Sankar
2020-10-19 14:38 ` Ross Philipson
2020-10-19 17:06 ` Arvind Sankar
2020-10-19 19:00 ` Ross Philipson
2020-10-19 14:51 ` Daniel Kiper
2020-10-19 17:18 ` Arvind Sankar
2020-10-21 15:28 ` Daniel Kiper [this message]
2020-10-21 16:18 ` Arvind Sankar
2020-10-21 20:36 ` Ross Philipson
2020-09-24 14:58 ` [PATCH 08/13] x86: Secure Launch kernel late " Ross Philipson
2020-09-24 14:58 ` [PATCH 09/13] x86: Secure Launch SMP bringup support Ross Philipson
2020-09-24 14:58 ` [PATCH 10/13] x86: Secure Launch adding event log securityfs Ross Philipson
2020-09-24 14:58 ` [PATCH 11/13] kexec: Secure Launch kexec SEXIT support Ross Philipson
2020-09-24 14:58 ` [PATCH 12/13] reboot: Secure Launch SEXIT support on reboot paths Ross Philipson
2020-09-24 14:58 ` [PATCH 13/13] tpm: Allow locality 2 to be set when initializing the TPM for Secure Launch Ross Philipson
2020-09-25 5:30 ` [PATCH 00/13] x86: Trenchboot secure dynamic launch Linux kernel support Jarkko Sakkinen
2020-09-25 21:32 ` Daniel P. Smith
2020-09-27 23:59 ` Jarkko Sakkinen
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