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-gyration.c | 91 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 91 insertions(+) create mode 100644 drivers/hid/hid-gyration.c (limited to 'drivers/hid/hid-gyration.c') diff --git a/drivers/hid/hid-gyration.c b/drivers/hid/hid-gyration.c new file mode 100644 index 000000000..6606b57ab --- /dev/null +++ b/drivers/hid/hid-gyration.c @@ -0,0 +1,91 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * HID driver for some gyration "special" devices + * + * Copyright (c) 1999 Andreas Gal + * Copyright (c) 2000-2005 Vojtech Pavlik + * Copyright (c) 2005 Michael Haboustak for Concept2, Inc + * Copyright (c) 2008 Jiri Slaby + * Copyright (c) 2006-2008 Jiri Kosina + */ + +/* + */ + +#include +#include +#include +#include + +#include "hid-ids.h" + +#define gy_map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, \ + EV_KEY, (c)) +static int gyration_input_mapping(struct hid_device *hdev, struct hid_input *hi, + struct hid_field *field, struct hid_usage *usage, + unsigned long **bit, int *max) +{ + if ((usage->hid & HID_USAGE_PAGE) != HID_UP_LOGIVENDOR) + return 0; + + set_bit(EV_REP, hi->input->evbit); + switch (usage->hid & HID_USAGE) { + /* Reported on Gyration MCE Remote */ + case 0x00d: gy_map_key_clear(KEY_HOME); break; + case 0x024: gy_map_key_clear(KEY_DVD); break; + case 0x025: gy_map_key_clear(KEY_PVR); break; + case 0x046: gy_map_key_clear(KEY_MEDIA); break; + case 0x047: gy_map_key_clear(KEY_MP3); break; + case 0x048: gy_map_key_clear(KEY_MEDIA); break; + case 0x049: gy_map_key_clear(KEY_CAMERA); break; + case 0x04a: gy_map_key_clear(KEY_VIDEO); break; + case 0x05a: gy_map_key_clear(KEY_TEXT); break; + case 0x05b: gy_map_key_clear(KEY_RED); break; + case 0x05c: gy_map_key_clear(KEY_GREEN); break; + case 0x05d: gy_map_key_clear(KEY_YELLOW); break; + case 0x05e: gy_map_key_clear(KEY_BLUE); break; + + default: + return 0; + } + return 1; +} + +static int gyration_event(struct hid_device *hdev, struct hid_field *field, + struct hid_usage *usage, __s32 value) +{ + + if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput) + return 0; + + if ((usage->hid & HID_USAGE_PAGE) == HID_UP_GENDESK && + (usage->hid & 0xff) == 0x82) { + struct input_dev *input = field->hidinput->input; + input_event(input, usage->type, usage->code, 1); + input_sync(input); + input_event(input, usage->type, usage->code, 0); + input_sync(input); + return 1; + } + + return 0; +} + +static const struct hid_device_id gyration_devices[] = { + { HID_USB_DEVICE(USB_VENDOR_ID_GYRATION, USB_DEVICE_ID_GYRATION_REMOTE) }, + { HID_USB_DEVICE(USB_VENDOR_ID_GYRATION, USB_DEVICE_ID_GYRATION_REMOTE_2) }, + { HID_USB_DEVICE(USB_VENDOR_ID_GYRATION, USB_DEVICE_ID_GYRATION_REMOTE_3) }, + { } +}; +MODULE_DEVICE_TABLE(hid, gyration_devices); + +static struct hid_driver gyration_driver = { + .name = "gyration", + .id_table = gyration_devices, + .input_mapping = gyration_input_mapping, + .event = gyration_event, +}; +module_hid_driver(gyration_driver); + +MODULE_DESCRIPTION("HID driver for some gyration \"special\" devices"); +MODULE_LICENSE("GPL"); -- cgit v1.3.1