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-vivaldi.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 drivers/hid/hid-vivaldi.c (limited to 'drivers/hid/hid-vivaldi.c') diff --git a/drivers/hid/hid-vivaldi.c b/drivers/hid/hid-vivaldi.c new file mode 100644 index 000000000..cda5938fb --- /dev/null +++ b/drivers/hid/hid-vivaldi.c @@ -0,0 +1,57 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * HID support for Vivaldi Keyboard + * + * Copyright 2020 Google LLC. + * Author: Sean O'Brien + */ + +#include +#include +#include +#include +#include + +#include "hid-vivaldi-common.h" + +static int vivaldi_probe(struct hid_device *hdev, + const struct hid_device_id *id) +{ + struct vivaldi_data *drvdata; + int ret; + + drvdata = devm_kzalloc(&hdev->dev, sizeof(*drvdata), GFP_KERNEL); + if (!drvdata) + return -ENOMEM; + + hid_set_drvdata(hdev, drvdata); + + ret = hid_parse(hdev); + if (ret) + return ret; + + return hid_hw_start(hdev, HID_CONNECT_DEFAULT); +} + +static const struct hid_device_id vivaldi_table[] = { + { HID_DEVICE(HID_BUS_ANY, HID_GROUP_VIVALDI, HID_ANY_ID, HID_ANY_ID) }, + { } +}; + +MODULE_DEVICE_TABLE(hid, vivaldi_table); + +static struct hid_driver hid_vivaldi = { + .name = "hid-vivaldi", + .id_table = vivaldi_table, + .probe = vivaldi_probe, + .feature_mapping = vivaldi_feature_mapping, + .driver = { + .dev_groups = vivaldi_attribute_groups, + }, +}; + +module_hid_driver(hid_vivaldi); + +MODULE_AUTHOR("Sean O'Brien"); +MODULE_DESCRIPTION("HID vivaldi driver"); +MODULE_LICENSE("GPL"); -- cgit v1.3.1