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-petalynx.c | 106 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 106 insertions(+) create mode 100644 drivers/hid/hid-petalynx.c (limited to 'drivers/hid/hid-petalynx.c') diff --git a/drivers/hid/hid-petalynx.c b/drivers/hid/hid-petalynx.c new file mode 100644 index 000000000..1a986f077 --- /dev/null +++ b/drivers/hid/hid-petalynx.c @@ -0,0 +1,106 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * HID driver for some petalynx "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 "hid-ids.h" + +/* Petalynx Maxter Remote has maximum for consumer page set too low */ +static const __u8 *pl_report_fixup(struct hid_device *hdev, __u8 *rdesc, + unsigned int *rsize) +{ + if (*rsize >= 62 && rdesc[39] == 0x2a && rdesc[40] == 0xf5 && + rdesc[41] == 0x00 && rdesc[59] == 0x26 && + rdesc[60] == 0xf9 && rdesc[61] == 0x00) { + hid_info(hdev, "fixing up Petalynx Maxter Remote report descriptor\n"); + rdesc[60] = 0xfa; + rdesc[40] = 0xfa; + } + return rdesc; +} + +#define pl_map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, \ + EV_KEY, (c)) +static int pl_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) { + switch (usage->hid & HID_USAGE) { + case 0x05a: pl_map_key_clear(KEY_TEXT); break; + case 0x05b: pl_map_key_clear(KEY_RED); break; + case 0x05c: pl_map_key_clear(KEY_GREEN); break; + case 0x05d: pl_map_key_clear(KEY_YELLOW); break; + case 0x05e: pl_map_key_clear(KEY_BLUE); break; + default: + return 0; + } + return 1; + } + + if ((usage->hid & HID_USAGE_PAGE) == HID_UP_CONSUMER) { + switch (usage->hid & HID_USAGE) { + case 0x0f6: pl_map_key_clear(KEY_NEXT); break; + case 0x0fa: pl_map_key_clear(KEY_BACK); break; + default: + return 0; + } + return 1; + } + + return 0; +} + +static int pl_probe(struct hid_device *hdev, const struct hid_device_id *id) +{ + int ret; + + hdev->quirks |= HID_QUIRK_NOGET; + + ret = hid_parse(hdev); + if (ret) { + hid_err(hdev, "parse failed\n"); + goto err_free; + } + + ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); + if (ret) { + hid_err(hdev, "hw start failed\n"); + goto err_free; + } + + return 0; +err_free: + return ret; +} + +static const struct hid_device_id pl_devices[] = { + { HID_USB_DEVICE(USB_VENDOR_ID_PETALYNX, USB_DEVICE_ID_PETALYNX_MAXTER_REMOTE) }, + { } +}; +MODULE_DEVICE_TABLE(hid, pl_devices); + +static struct hid_driver pl_driver = { + .name = "petalynx", + .id_table = pl_devices, + .report_fixup = pl_report_fixup, + .input_mapping = pl_input_mapping, + .probe = pl_probe, +}; +module_hid_driver(pl_driver); + +MODULE_DESCRIPTION("HID driver for some petalynx \"special\" devices"); +MODULE_LICENSE("GPL"); -- cgit v1.3.1