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/mfd/intel-lpss.h | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 drivers/mfd/intel-lpss.h (limited to 'drivers/mfd/intel-lpss.h') diff --git a/drivers/mfd/intel-lpss.h b/drivers/mfd/intel-lpss.h new file mode 100644 index 000000000..6f8f668f4 --- /dev/null +++ b/drivers/mfd/intel-lpss.h @@ -0,0 +1,47 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Intel LPSS core support. + * + * Copyright (C) 2015, Intel Corporation + * + * Authors: Andy Shevchenko + * Mika Westerberg + */ + +#ifndef __MFD_INTEL_LPSS_H +#define __MFD_INTEL_LPSS_H + +#include +#include + +/* + * Some DSDTs have an unused GEXP ACPI device conflicting with I2C4 resources. + * Set to ignore resource conflicts with ACPI declared SystemMemory regions. + */ +#define QUIRK_IGNORE_RESOURCE_CONFLICTS BIT(0) +/* + * Some devices have misconfigured clock divider due to a firmware bug. + * Set this to force the clock divider to 1:1 ratio. + */ +#define QUIRK_CLOCK_DIVIDER_UNITY BIT(1) + +struct device; +struct resource; +struct software_node; + +struct intel_lpss_platform_info { + struct resource *mem; + int irq; + unsigned int quirks; + unsigned long clk_rate; + const char *clk_con_id; + const struct software_node *swnode; +}; + +int intel_lpss_probe(struct device *dev, + const struct intel_lpss_platform_info *info); +void intel_lpss_remove(struct device *dev); + +extern const struct dev_pm_ops intel_lpss_pm_ops; + +#endif /* __MFD_INTEL_LPSS_H */ -- cgit v1.3.1