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-lcpower.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 drivers/hid/hid-lcpower.c (limited to 'drivers/hid/hid-lcpower.c') diff --git a/drivers/hid/hid-lcpower.c b/drivers/hid/hid-lcpower.c new file mode 100644 index 000000000..58953d11d --- /dev/null +++ b/drivers/hid/hid-lcpower.c @@ -0,0 +1,57 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * HID driver for LC Power Model RC1000MCE + * + * Copyright (c) 2011 Chris Schlund + * based on hid-topseed module + */ + +/* + */ + +#include +#include +#include + +#include "hid-ids.h" + +#define ts_map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, \ + EV_KEY, (c)) +static int ts_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; + + switch (usage->hid & HID_USAGE) { + case 0x046: ts_map_key_clear(KEY_YELLOW); break; + case 0x047: ts_map_key_clear(KEY_GREEN); break; + case 0x049: ts_map_key_clear(KEY_BLUE); break; + case 0x04a: ts_map_key_clear(KEY_RED); break; + case 0x00d: ts_map_key_clear(KEY_HOME); break; + case 0x025: ts_map_key_clear(KEY_TV); break; + case 0x048: ts_map_key_clear(KEY_VCR); break; + case 0x024: ts_map_key_clear(KEY_MENU); break; + default: + return 0; + } + + return 1; +} + +static const struct hid_device_id ts_devices[] = { + { HID_USB_DEVICE( USB_VENDOR_ID_LCPOWER, USB_DEVICE_ID_LCPOWER_LC1000) }, + { } +}; +MODULE_DEVICE_TABLE(hid, ts_devices); + +static struct hid_driver ts_driver = { + .name = "LC RC1000MCE", + .id_table = ts_devices, + .input_mapping = ts_input_mapping, +}; +module_hid_driver(ts_driver); + +MODULE_DESCRIPTION("HID driver for LC Power Model RC1000MCE"); +MODULE_LICENSE("GPL"); -- cgit v1.3.1