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[61.228.52.13]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-38a5506b48bsm3957570a91.1.2026.07.11.04.49.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 11 Jul 2026 04:49:58 -0700 (PDT) From: Shih-Yuan Lee To: Dmitry Torokhov , Mark Brown Cc: Daniel Mack , Haojian Zhuang , Robert Jarzmik , Shih-Yuan Lee , linux-input@vger.kernel.org, linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v4 0/3] Input/SPI: fixes for MacBook8,1 DMA timeout, UAF, and NULL pointer dereference Date: Sat, 11 Jul 2026 19:49:34 +0800 Message-Id: <20260711114937.16670-1-fourdollars@debian.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20260711055247.5412-1-fourdollars@debian.org> References: <20260711055247.5412-1-fourdollars@debian.org> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hi Dmitry, Mark, and the linux-input/linux-spi community, This patch series addresses a long-standing DMA initialization timeout on the early 2015 12" MacBook (MacBook8,1) on any boot (including cold boot), as well as two pre-existing, high-severity UAF/NULL-pointer bugs in the applespi driver. Changes in v4: - Reverted the runtime `can_dma` callback override from `applespi.c` to avoid architectural layering violation, data races (TOCTOU) with concurrent SPI transfers, and execute-after-free vulnerability upon module unload. - Moved the DMI quirk forcing PIO mode for MacBook8,1 to the host PCI glue driver (spi-pxa2xx-pci.c) where LPSS setup occurs. - Formatted the DMI match using a structured `pxa2xx_spi_pci_dmi_table` and helper function `pxa2xx_spi_pci_can_dma()`. - Added a `force_pio` module parameter in spi-pxa2xx-pci.c to allow other users to manually force PIO mode for debugging. Changes in v3: - Added a `force_pio` module parameter to applespi to allow users to manually disable DMA for SPI transfers. - Resolved the execute-after-free vulnerability by unconditionally restoring the original can_dma callback (even if NULL) in the driver remove path. - Fixed the probe timing issue by applying the can_dma override at the very beginning of applespi_probe() so that all early initialization transfers safely use PIO mode, and properly restoring it in all probe error paths. - Documented the Bugzilla link in the commit message of Patch 1. Changes in v2: - Fixed an unbind/remove execute-after-free vulnerability by storing and restoring the host controller's original can_dma callback in applespi_probe() and applespi_remove(). - Split the fixes into a 3-patch logical series. Patch 1 fixes a pre-existing UAF vulnerability in the driver unbind path by explicitly calling cancel_work_sync() on the asynchronous registration worker work struct before devres frees the driver private data. Patch 2 fixes a pre-existing race condition in the debugfs interface where userspace could open the tp_dim file before the asynchronous worker has finished initializing applespi->touchpad_input_dev, leading to a NULL pointer dereference. We resolve this using smp_load_acquire() and checking for NULL. Patch 3 introduces a structured DMI quirk and a `force_pio` module parameter in spi-pxa2xx-pci.c to disable DMA on MacBook8,1. This forces the controller to use the rock-solid PIO mode from the very beginning. Best regards, Shih-Yuan Lee Shih-Yuan Lee (3): Input: applespi - cancel pending work on driver remove Input: applespi - fix NULL pointer dereference in tp_dim open spi: pxa2xx: disable DMA for Apple MacBook8,1 drivers/input/keyboard/applespi.c | 10 +++++++++- drivers/spi/spi-pxa2xx-pci.c | 33 ++++++++++++++++++++++++++++++- 2 files changed, 41 insertions(+), 2 deletions(-) -- 2.39.5