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-ezkey.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 drivers/hid/hid-ezkey.c (limited to 'drivers/hid/hid-ezkey.c') diff --git a/drivers/hid/hid-ezkey.c b/drivers/hid/hid-ezkey.c new file mode 100644 index 000000000..0e28bc0b8 --- /dev/null +++ b/drivers/hid/hid-ezkey.c @@ -0,0 +1,79 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * HID driver for some ezkey "special" devices + * + * Copyright (c) 1999 Andreas Gal + * Copyright (c) 2000-2005 Vojtech Pavlik + * Copyright (c) 2005 Michael Haboustak for Concept2, Inc + * Copyright (c) 2006-2007 Jiri Kosina + * Copyright (c) 2008 Jiri Slaby + */ + +/* + */ + +#include +#include +#include +#include + +#include "hid-ids.h" + +#define ez_map_rel(c) hid_map_usage(hi, usage, bit, max, EV_REL, (c)) +#define ez_map_key(c) hid_map_usage(hi, usage, bit, max, EV_KEY, (c)) + +static int ez_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_CONSUMER) + return 0; + + switch (usage->hid & HID_USAGE) { + case 0x230: ez_map_key(BTN_MOUSE); break; + case 0x231: ez_map_rel(REL_WHEEL); break; + /* + * this keyboard has a scrollwheel implemented in + * totally broken way. We map this usage temporarily + * to HWHEEL and handle it in the event quirk handler + */ + case 0x232: ez_map_rel(REL_HWHEEL); break; + default: + return 0; + } + return 1; +} + +static int ez_event(struct hid_device *hdev, struct hid_field *field, + struct hid_usage *usage, __s32 value) +{ + if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput || + !usage->type) + return 0; + + /* handle the temporary quirky mapping to HWHEEL */ + if (usage->type == EV_REL && usage->code == REL_HWHEEL) { + struct input_dev *input = field->hidinput->input; + input_event(input, usage->type, REL_WHEEL, -value); + return 1; + } + + return 0; +} + +static const struct hid_device_id ez_devices[] = { + { HID_USB_DEVICE(USB_VENDOR_ID_EZKEY, USB_DEVICE_ID_BTC_8193) }, + { } +}; +MODULE_DEVICE_TABLE(hid, ez_devices); + +static struct hid_driver ez_driver = { + .name = "ezkey", + .id_table = ez_devices, + .input_mapping = ez_input_mapping, + .event = ez_event, +}; +module_hid_driver(ez_driver); + +MODULE_DESCRIPTION("HID driver for some ezkey \"special\" devices"); +MODULE_LICENSE("GPL"); -- cgit v1.3.1