linux-kernel - Re: [PATCH v9] tpm: Map the ACPI provided event log

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Message-Id: <D730O4K9L593.1CJKTW6NO6TUB@kernel.org>
Date: Thu, 16 Jan 2025 00:57:09 +0200
From: "Jarkko Sakkinen" <jarkko@...nel.org>
To: "Stefan Berger" <stefanb@...ux.ibm.com>,
 <linux-integrity@...r.kernel.org>, "Peter Huewe" <peterhuewe@....de>,
 "Jason Gunthorpe" <jgg@...pe.ca>, "Colin Ian King"
 <colin.i.king@...il.com>, "Reiner Sailer" <sailer@...ibm.com>, "Seiji
 Munetoh" <munetoh@...ibm.com>, "Kylene Jo Hall" <kjhall@...ibm.com>,
 "Stefan Berger" <stefanb@...ibm.com>, "Andrew Morton" <akpm@...l.org>
Cc: "Ard Biesheuvel" <ardb@...nel.org>, <stable@...r.kernel.org>, "Andy
 Liang" <andy.liang@....com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9] tpm: Map the ACPI provided event log

On Thu Jan 16, 2025 at 12:03 AM EET, Stefan Berger wrote:
>
>
> On 1/15/25 4:22 PM, Jarkko Sakkinen wrote:
> > The following failure was reported:
> > 
> > [   10.693310][    T1] tpm_tis STM0925:00: 2.0 TPM (device-id 0x3, rev-id 0)
> > [   10.848132][    T1] ------------[ cut here ]------------
> > [   10.853559][    T1] WARNING: CPU: 59 PID: 1 at mm/page_alloc.c:4727 __alloc_pages_noprof+0x2ca/0x330
> > [   10.862827][    T1] Modules linked in:
> > [   10.866671][    T1] CPU: 59 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.12.0-lp155.2.g52785e2-default #1 openSUSE Tumbleweed (unreleased) 588cd98293a7c9eba9013378d807364c088c9375
> > [   10.882741][    T1] Hardware name: HPE ProLiant DL320 Gen12/ProLiant DL320 Gen12, BIOS 1.20 10/28/2024
> > [   10.892170][    T1] RIP: 0010:__alloc_pages_noprof+0x2ca/0x330
> > [   10.898103][    T1] Code: 24 08 e9 4a fe ff ff e8 34 36 fa ff e9 88 fe ff ff 83 fe 0a 0f 86 b3 fd ff ff 80 3d 01 e7 ce 01 00 75 09 c6 05 f8 e6 ce 01 01 <0f> 0b 45 31 ff e9 e5 fe ff ff f7 c2 00 00 08 00 75 42 89 d9 80 e1
> > [   10.917750][    T1] RSP: 0000:ffffb7cf40077980 EFLAGS: 00010246
> > [   10.923777][    T1] RAX: 0000000000000000 RBX: 0000000000040cc0 RCX: 0000000000000000
> > [   10.931727][    T1] RDX: 0000000000000000 RSI: 000000000000000c RDI: 0000000000040cc0
> > 
> > Above shows that ACPI pointed a 16 MiB buffer for the log events because
> > RSI maps to the 'order' parameter of __alloc_pages_noprof(). Address the
> > bug with kvmalloc() and devm_add_action_or_reset().
>
> Before at it was (at least) failing when the BIOS requested an excessive 
> size. Now since you don't want to limit the size of the log I suppose 
> you wouldn't also want to set a size of what is excessive so that the 
> driver could dev_warn() the user of an excessive-sized buffer ...
>
> > 
> > Suggested-by: Ard Biesheuvel <ardb@...nel.org>
> > Cc: stable@...r.kernel.org # v2.6.16+
> > Fixes: 55a82ab3181b ("[PATCH] tpm: add bios measurement log")
> > Reported-by: Andy Liang <andy.liang@....com>
> > Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219495
> > Signed-off-by: Jarkko Sakkinen <jarkko@...nel.org>
>
> Reviewed-by: Stefan Berger <stefanb@...ux.ibm.com>

Sorry there was small glitch because I had a small diff unamended
to the commit. See the last diff:

https://lore.kernel.org/linux-integrity/20250115224315.482487-1-jarkko@kernel.org/T/#u

I guess the reviewed-by still holds, right? :-)

BR, Jarkko