linux-kernel - [PATCH] acpi/ghes: add TAINT_MACHINE

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250702-add_tain-v1-1-9187b10914b9@debian.org>
Date: Wed, 02 Jul 2025 08:39:51 -0700
From: Breno Leitao <leitao@...ian.org>
To: "Rafael J. Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>, 
 James Morse <james.morse@....com>, Tony Luck <tony.luck@...el.com>, 
 Borislav Petkov <bp@...en8.de>
Cc: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org, 
 kernel-team@...a.com, Breno Leitao <leitao@...ian.org>
Subject: [PATCH] acpi/ghes: add TAINT_MACHINE_CHECK on GHES panic path

When a GHES (Generic Hardware Error Source) triggers a panic, add the
TAINT_MACHINE_CHECK taint flag to the kernel. This explicitly marks the
kernel as tainted due to a machine check event, improving diagnostics
and post-mortem analysis. The taint is set with LOCKDEP_STILL_OK to
indicate lockdep remains valid.

At large scale deployment, this helps to quickly determin panics that
are coming due to hardware failures.

Signed-off-by: Breno Leitao <leitao@...ian.org>
---
 drivers/acpi/apei/ghes.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index f0584ccad4519..3d44f926afe8e 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -1088,6 +1088,8 @@ static void __ghes_panic(struct ghes *ghes,

 	__ghes_print_estatus(KERN_EMERG, ghes->generic, estatus);

+	add_taint(TAINT_MACHINE_CHECK, LOCKDEP_STILL_OK);
+
 	ghes_clear_estatus(ghes, estatus, buf_paddr, fixmap_idx);

 	if (!panic_timeout)

---
base-commit: e96ee511c906c59b7c4e6efd9d9b33917730e000
change-id: 20250702-add_tain-902925f3eb96

Best regards,
--  
Breno Leitao <leitao@...ian.org>