From 506ada89629ec7059b96ecfb0dc7d33ece0103ca Mon Sep 17 00:00:00 2001 From: Eduard Zingerman Date: Fri, 4 Sep 2026 17:05:56 -0700 Subject: bpf: mark a NULL kfunc argument precise check_kfunc_arg() allows bpf_register_is_null() for nullable arguments w/o marking the underlying scalar register precise. Hence a checkpoint created on such a path would prune against arbitrary scalar value. Fixes: 3bda08b63670 ("bpf: Allow NULL buffers in bpf_dynptr_slice(_rw)") Signed-off-by: Eduard Zingerman Link: https://lore.kernel.org/r/20260904-register-is-null-precise-fixes-v1-5-0f5a360ff15d@gmail.com Signed-off-by: Alexei Starovoitov --- drivers/md/dm-vdo/thread-device.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 drivers/md/dm-vdo/thread-device.c (limited to 'drivers/md/dm-vdo/thread-device.c') diff --git a/drivers/md/dm-vdo/thread-device.c b/drivers/md/dm-vdo/thread-device.c new file mode 100644 index 000000000..df13ca914 --- /dev/null +++ b/drivers/md/dm-vdo/thread-device.c @@ -0,0 +1,34 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2023 Red Hat + */ + +#include "thread-device.h" + +/* A registry of threads associated with device id numbers. */ +static struct thread_registry device_id_thread_registry; + +/* Any registered thread must be unregistered. */ +void vdo_register_thread_device_id(struct registered_thread *new_thread, + unsigned int *id_ptr) +{ + vdo_register_thread(&device_id_thread_registry, new_thread, id_ptr); +} + +void vdo_unregister_thread_device_id(void) +{ + vdo_unregister_thread(&device_id_thread_registry); +} + +int vdo_get_thread_device_id(void) +{ + const unsigned int *pointer; + + pointer = vdo_lookup_thread(&device_id_thread_registry); + return (pointer != NULL) ? *pointer : -1; +} + +void vdo_initialize_thread_device_registry(void) +{ + vdo_initialize_thread_registry(&device_id_thread_registry); +} -- cgit v1.3.1