From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f171.google.com (mail-pl1-f171.google.com [209.85.214.171]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 01A22392C32 for ; Sat, 11 Jul 2026 13:11:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.171 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783775508; cv=none; b=R/kkwTL1pYj7/5DwfGDyaSBsv8UCDp0HvJvTPo0xTMC/R7D+ii+BT3mHVb/QUaLVPykQ6fgvjixKAq1HVzrwt3S5o6p+Sq08KFhdtu52PoOjvJAsE7UPXzkVc9oGDPbiHepku2PPByzbtg9vz7RVR/fAWQ2P15S3H4OBytrDKFs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783775508; c=relaxed/simple; bh=Cn6yGw5q9/Z0212RFdCF/Qhf73gxRfIE4bUedXUKP7I=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Q79mWIu7/EZyLFodl/myjm9vyAqRkSFmla67BXUscdXu5zERZ+m5/mACRXHNmHhqiP2RFUUg7jsb8jAApZVnF06Bk2TuGOvkGfPCH9MMTKXqv0xGTQsOBxma/dLuatVGr5Z/E/aORDQ3svioC6nD0b/BBniZ8hGWx4ACZxvmH5U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=debian.org; spf=pass smtp.mailfrom=gmail.com; arc=none smtp.client-ip=209.85.214.171 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=debian.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Received: by mail-pl1-f171.google.com with SMTP id d9443c01a7336-2ccf2360620so15530545ad.3 for ; Sat, 11 Jul 2026 06:11:46 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1783775506; x=1784380306; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=wB9KtAsHUlHpaPuJBonnbCsh7/wGYO7fHNabzQOq95U=; b=j9i8LLhIOdRtmclV6Xjw3LW1Vr5Nn3A029MvWm3ZEkT8gUITE2pTTv6ZXr/sQnX8bW Sy2DY2no1Wy8NFqNL4e9uhIONG1zkUuPvN7AHfrj9r/D9y9Ra041oS5i/xw1yvLL5bb6 04WzMBKbFo8zlqA2po3SC8xtr49kbAmPKw7K6x2DX377RYkvsKPxxUSHteIwoZXMVgDg zkMIwBsDDLdyZx9wrfmSeR3dA5nBh0JGp/+DoEF0aBC33fSdAKUOHi1WzubwZRcohEsh /KhHIrj9SaFD2wEkh1mVRt+XqJuVMLosBmAq89Y6ugKNe5yjvX8TrurD+edFOGKtOaJ8 DVSg== X-Forwarded-Encrypted: i=1; AHgh+RoQ+YEZO1riIHxij159QWUGzq0KaWTxVGoFlUeCxoO70DBQPtq8V5xOn2DCygc9V4Utg9LAIuf5SY2clGU=@vger.kernel.org X-Gm-Message-State: AOJu0Yz4X7rcFFM7AS0HbxKRohqdXQ3JriacUCh3FgVYFam40xMr9kjB erxS7wdOgr07XLJP5uVmb0tIBU7TD7Z5hXLIUM8QOaT35tZ1jAeNnVQ= X-Gm-Gg: AfdE7cmbC2VKQTHKsrSKo2wmGarpHWVJBWbJek+94oG8OwAQIqJZcb/k+/ZwOy75fb3 TDRFyCQw0W6vtWkw5k/P/IGVke7HP6y+2jl2Z1QN3Z9xwx76P7LBRDkqWGNdjKrPg0MNSDZCgL0 95H/hWIFLqNYsg6/tJdL6kr6tDPPG6oWRh4nlC00Zc44x/DxtvCYgoYX0aS1hBAtoj5YIkiF5cd Q/v/NDa9jMj3nFWzrC+XRE/sgzy3B6sDu7/BiMA4TVfd04zpptihDlFYJNrLd9RkmQSKtScYhXy onigk0+eoOqoc/TrO+6Gf9xg/YEQhfifX2wEX6tpG7Jn5aCHik8cyef524wn00dEzGigbTPNaGB lZJuhmXEm8aWk5STi1JohmOzMTRGdsWbu/tAX72ZMFPfXNFE4I1jwgEQmPaMHr894aH7By5xRyZ fjACKKmOK+CO0p4+cfEI9JT7J7xKxQQNwV7ccQ86bLl5zErYzINebLznR6SZ2/5FCaMZInWBaV1 xq6OnngE9Zznw16PUzwWNuPRw== X-Received: by 2002:a17:90b:560f:b0:389:8f6c:4d59 with SMTP id 98e67ed59e1d1-38dc7779d1bmr2946328a91.24.1783775506362; Sat, 11 Jul 2026 06:11:46 -0700 (PDT) Received: from penguin.tail0a1999.ts.net (61-228-52-13.dynamic-ip.hinet.net. [61.228.52.13]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-38a55557f25sm4136221a91.5.2026.07.11.06.11.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 11 Jul 2026 06:11:45 -0700 (PDT) From: Shih-Yuan Lee To: Dmitry Torokhov , Mark Brown Cc: linux-input@vger.kernel.org, linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, Shih-Yuan Lee Subject: [PATCH v5 0/3] Input/SPI: fixes for MacBook8,1 DMA timeout, UAF, and NULL pointer dereference Date: Sat, 11 Jul 2026 21:11:37 +0800 Message-Id: <20260711131140.18777-1-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-kernel@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 v5: - Updated both `lpss_spi_setup()` and `mrfld_spi_setup()` in `spi-pxa2xx-pci.c` to consistently respect the `force_pio` module parameter across all supported PCI devices (avoiding hardcoded DMA enable on Merrifield systems). 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 | 35 +++++++++++++++++++++++++++++-- 2 files changed, 42 insertions(+), 3 deletions(-) -- 2.39.5