linux-kernel - [PATCH v6 1/2] tpm: Map the ACPI provided event log

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Message-ID: <20241225193242.40066-1-jarkko@kernel.org>
Date: Wed, 25 Dec 2024 21:32:31 +0200
From: Jarkko Sakkinen <jarkko@...nel.org>
To: linux-integrity@...r.kernel.org,
	Peter Huewe <peterhuewe@....de>,
	Jarkko Sakkinen <jarkko@...nel.org>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Colin Ian King <colin.i.king@...il.com>,
	Seiji Munetoh <munetoh@...ibm.com>,
	Andrew Morton <akpm@...l.org>,
	Reiner Sailer <sailer@...ibm.com>,
	Kylene Jo Hall <kjhall@...ibm.com>,
	Stefan Berger <stefanb@...ibm.com>
Cc: stable@...r.kernel.org,
	Andy Liang <andy.liang@....com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v6 1/2] tpm: Map the ACPI provided event log

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 devres_add().

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
Suggested-by: Matthew Garrett <mjg59@...f.ucam.org>
Signed-off-by: Jarkko Sakkinen <jarkko@...nel.org>
---
v6:
* A new patch.
---
 drivers/char/tpm/eventlog/acpi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/char/tpm/eventlog/acpi.c b/drivers/char/tpm/eventlog/acpi.c
index 69533d0bfb51..7cd44a46a0d7 100644
--- a/drivers/char/tpm/eventlog/acpi.c
+++ b/drivers/char/tpm/eventlog/acpi.c
@@ -136,10 +136,12 @@ int tpm_read_log_acpi(struct tpm_chip *chip)
 	}
 
 	/* malloc EventLog space */
-	log->bios_event_log = devm_kmalloc(&chip->dev, len, GFP_KERNEL);
+	log->bios_event_log = kvmalloc(len, GFP_KERNEL);
 	if (!log->bios_event_log)
 		return -ENOMEM;
 
+	devres_add(&chip->dev, log->bios_event_log);
+
 	log->bios_event_log_end = log->bios_event_log + len;
 
 	virt = acpi_os_map_iomem(start, len);
-- 
2.47.1