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/hid-evision.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 drivers/hid/hid-evision.c (limited to 'drivers/hid/hid-evision.c') diff --git a/drivers/hid/hid-evision.c b/drivers/hid/hid-evision.c new file mode 100644 index 000000000..3e7f43ab8 --- /dev/null +++ b/drivers/hid/hid-evision.c @@ -0,0 +1,75 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * HID driver for EVision devices + * For now, only ignore bogus consumer reports + * sent after the keyboard has been configured + * + * Copyright (c) 2022 Philippe Valembois + */ + +#include +#include +#include +#include + +#include "hid-ids.h" + +static int evision_input_mapping(struct hid_device *hdev, struct hid_input *hi, + struct hid_field *field, struct hid_usage *usage, + unsigned long **bit, int *max) +{ + /* mapping only applies to USB_DEVICE_ID_EVISION_ICL01 */ + if (hdev->product != USB_DEVICE_ID_EVISION_ICL01) + return 0; + + if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER) + return 0; + + /* Ignore key down event */ + if ((usage->hid & HID_USAGE) >> 8 == 0x05) + return -1; + /* Ignore key up event */ + if ((usage->hid & HID_USAGE) >> 8 == 0x06) + return -1; + + switch (usage->hid & HID_USAGE) { + /* Ignore configuration saved event */ + case 0x0401: return -1; + /* Ignore reset event */ + case 0x0402: return -1; + } + return 0; +} + +#define REP_DSC_SIZE 236 +#define USAGE_MAX_INDEX 59 + +static const __u8 *evision_report_fixup(struct hid_device *hdev, __u8 *rdesc, + unsigned int *rsize) +{ + if (hdev->product == USB_DEVICE_ID_EV_TELINK_RECEIVER && + *rsize == REP_DSC_SIZE && rdesc[USAGE_MAX_INDEX] == 0x29 && + rdesc[USAGE_MAX_INDEX + 1] == 3) { + hid_info(hdev, "fixing EVision:TeLink Receiver report descriptor\n"); + rdesc[USAGE_MAX_INDEX + 1] = 5; // change usage max from 3 to 5 + } + return rdesc; +} + +static const struct hid_device_id evision_devices[] = { + { HID_USB_DEVICE(USB_VENDOR_ID_EVISION, USB_DEVICE_ID_EVISION_ICL01) }, + { HID_USB_DEVICE(USB_VENDOR_ID_EVISION, USB_DEVICE_ID_EV_TELINK_RECEIVER) }, + { } +}; +MODULE_DEVICE_TABLE(hid, evision_devices); + +static struct hid_driver evision_driver = { + .name = "evision", + .id_table = evision_devices, + .input_mapping = evision_input_mapping, + .report_fixup = evision_report_fixup, +}; +module_hid_driver(evision_driver); + +MODULE_DESCRIPTION("HID driver for EVision devices"); +MODULE_LICENSE("GPL"); -- cgit v1.3.1