linux-kernel - [PATCH v5 0/4] apei/ghes: don't OOPS with bad ARM error CPER records

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Message-ID: <cover.1767804050.git.mchehab+huawei@kernel.org>
Date: Wed,  7 Jan 2026 17:41:48 +0100
From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To: "Rafael J. Wysocki" <rafael@...nel.org>,
	Ard Biesheuvel <ardb@...nel.org>,
	Robert Moore <robert.moore@...el.com>
Cc: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
	acpica-devel@...ts.linux.dev,
	linux-acpi@...r.kernel.org,
	linux-edac@...r.kernel.org,
	linux-efi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Ankit Agrawal <ankita@...dia.com>,
	Borislav Petkov <bp@...en8.de>,
	Breno Leitao <leitao@...ian.org>,
	Dave Jiang <dave.jiang@...el.com>,
	Hanjun Guo <guohanjun@...wei.com>,
	Huang Yiwei <quic_hyiwei@...cinc.com>,
	Ingo Molnar <mingo@...nel.org>,
	Ira Weiny <ira.weiny@...el.com>,
	Jason Tian <jason@...amperecomputing.com>,
	Jonathan Cameron <jonathan.cameron@...wei.com>,
	Len Brown <lenb@...nel.org>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Shuai Xue <xueshuai@...ux.alibaba.com>,
	Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>,
	Tony Luck <tony.luck@...el.com>
Subject: [PATCH v5 0/4] apei/ghes: don't OOPS with bad ARM error CPER records

Rafael,

Current parsing logic at apei/ghes for ARM Processor Error
assumes that the record sizes are correct. Yet, a bad BIOS
might produce malformed GHES reports.

Worse than that, it may end exposing data from other memory
addresses, as the logic may end dumping large portions of
the memory.

Avoid that by checking the buffer sizes where needed.

---

v5:
 - Changed the name of a var as requested by Jonathan

v4:
 - addressed Jonathan comments;
 - added two extra patches to prevent other OOM issues.

v3:
  - addressed Shuai feedback;
  - moved all ghes code to one patch;
  - fixed a typo and a bad indent;
  - cleanup the size check logic at ghes.c.


Mauro Carvalho Chehab (4):
  apei/ghes: ARM processor Error: don't go past allocated memory
  efi/cper: don't go past the ARM processor CPER record buffer
  apei/ghes: ensure that won't go past CPER allocated record
  efi/cper: don't dump the entire memory region

 drivers/acpi/apei/ghes.c        | 38 ++++++++++++++++++++++++++++-----
 drivers/firmware/efi/cper-arm.c | 12 +++++++----
 drivers/firmware/efi/cper.c     |  8 ++++++-
 drivers/ras/ras.c               |  6 +++++-
 include/acpi/ghes.h             |  1 +
 include/linux/cper.h            |  3 ++-
 6 files changed, 56 insertions(+), 12 deletions(-)

-- 
2.52.0