linux-kernel - [PATCH v3 0/4] platform/x86/amd/pmf: Fix policy binary handling

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Date: Mon,  4 Mar 2024 21:50:01 +0100
From: Armin Wolf <W_Armin@....de>
To: Shyam-sundar.S-k@....com
Cc: hdegoede@...hat.com,
	ilpo.jarvinen@...ux.intel.com,
	platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 0/4] platform/x86/amd/pmf: Fix policy binary handling

This patch series fixes various issues inside the policy binary
handling code.
The first patch makes sure that a valid error code is returned upon
failing to start the policy engine, while the second patch drops the
usage of readl() on non-io memory.
The last two patches fix a possible out-of-bounds memory access when
parsing the policy binary header.

All patches are compile-tested only.

Changes since v2:
- add patches 1 and 3

Changes since v1:
- get the full dword instead of only 8 bits when reading the header
- check if the policy buffer also has enough room for storing the length

Armin Wolf (4):
  platform/x86/amd/pmf: Fix return value of
    amd_pmf_start_policy_engine()
  platform/x86/amd/pmf: Do not use readl() for policy buffer access
  platform/x86/amd/pmf: Use struct for cookie header
  platform/x86/amd/pmf: Fix possible out-of-bound memory accesses

 drivers/platform/x86/amd/pmf/pmf.h    |  6 +++++-
 drivers/platform/x86/amd/pmf/tee-if.c | 21 +++++++++++++--------
 2 files changed, 18 insertions(+), 9 deletions(-)

--
2.39.2