[coreboot - Bug #576] (New) GPIO locking is broken on Kaby Lake and possibly other platforms - coreboot

30 Jan 2025


      Issue #576 has been reported by Mate Kukri.
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Bug #576: GPIO locking is broken on Kaby Lake and possibly other platforms
https://ticket.coreboot.org/issues/576
* Author: Mate Kukri
* Status: New
* Priority: Normal
* Target version: none
* Start date: 2025-01-30
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Many supported Kaby Lake boards (and possibly newer platforms as well) are vulnerable to [TPM GPIO reset attacks](https://mkukri.xyz/2024/06/01/tpm-gpio-fail.html).
Trying to fix this by marking the affected GPIOs as locked in gpio.h and even also selecting `SOC_INTEL_COMMON_BLOCK_SMM_LOCK_GPIO_PADS` does not work.
This was discovered last year and briefly discussed on #coreboot, but it came up again on the Heads matrix group in relation to supporting the TPM on the in-progress ThinkPad T480 port.
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