From 6668ed271eaefaa63e686bdfbedaeb7b8e492722 Mon Sep 17 00:00:00 2001 From: Kumar Kartikeya Dwivedi Date: Fri, 4 Sep 2026 10:43:19 +0200 Subject: selftests/bpf: Reject graph kptr use after RCU unlock Add a sleepable verifier test that loads a graph-node local kptr in an explicit RCU read-side critical section, then passes its node to bpf_rbtree_remove() after the section ends. Before the verifier fix, the stale NON_OWN_REF flag makes the node look like a live borrowed reference and the program is accepted. After the fix, the pointer is demoted without NON_OWN_REF and the graph kfunc argument is rejected. Also exercise a graph kptr loaded while a spin lock provides implicit RCU protection. The pointer must be invalidated when the lock is released, which guards the required ordering between non-owning-reference invalidation and RCU demotion. Update the existing fault-protected load test state description. The post-unlock pointer no longer carries NON_OWN_REF, but remains readable because the load is rewritten to use BPF_PROBE_MEM. Signed-off-by: Kumar Kartikeya Dwivedi Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com Signed-off-by: Alexei Starovoitov --- drivers/hid/intel-thc-hid/Kconfig | 43 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 drivers/hid/intel-thc-hid/Kconfig (limited to 'drivers/hid/intel-thc-hid/Kconfig') diff --git a/drivers/hid/intel-thc-hid/Kconfig b/drivers/hid/intel-thc-hid/Kconfig new file mode 100644 index 000000000..9d74e53b8 --- /dev/null +++ b/drivers/hid/intel-thc-hid/Kconfig @@ -0,0 +1,43 @@ +# SPDX-License-Identifier: GPL-2.0 +# Copyright (c) 2024, Intel Corporation. + +menu "Intel THC HID Support" + depends on X86_64 && PCI + +config INTEL_THC_HID + tristate "Intel Touch Host Controller" + depends on ACPI + select SGL_ALLOC + help + THC (Touch Host Controller) is the name of the IP block in PCH that + interfaces with Touch Devices (ex: touchscreen, touchpad etc.). It + is comprised of 3 key functional blocks: A natively half-duplex + Quad I/O capable SPI master; a low latency I2C interface to support + HIDI2C compliant devices; a hardware sequencer with Read/Write DMA + capability to system memory. + + Say Y/M here if you want to support Intel THC. If unsure, say N. + +config INTEL_QUICKSPI + tristate "Intel QuickSPI driver based on Intel Touch Host Controller" + depends on INTEL_THC_HID + help + Intel QuickSPI, based on Touch Host Controller (THC), implements + HIDSPI (HID over SPI) protocol. It configures THC to work at SPI + mode, and controls THC hardware sequencer to accelerate HIDSPI + transaction flow. + + Say Y/M here if you want to support Intel QuickSPI. If unsure, say N. + +config INTEL_QUICKI2C + tristate "Intel QuickI2C driver based on Intel Touch Host Controller" + depends on INTEL_THC_HID + help + Intel QuickI2C, uses Touch Host Controller (THC) hardware, implements + HIDI2C (HID over I2C) protocol. It configures THC to work in I2C + mode, and controls THC hardware sequencer to accelerate HIDI2C + transaction flow. + + Say Y/M here if you want to support Intel QuickI2C. If unsure, say N. + +endmenu -- cgit v1.3.1