uptr_update_failure.c

 1// SPDX-License-Identifier: GPL-2.0
 2/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
 3
 4#include <vmlinux.h>
 5#include <bpf/bpf_helpers.h>
 6#include "uptr_test_common.h"
 7
 8struct {
 9	__uint(type, BPF_MAP_TYPE_TASK_STORAGE);
10	__uint(map_flags, BPF_F_NO_PREALLOC);
11	__type(key, int);
12	__type(value, struct value_lock_type);
13} datamap SEC(".maps");
14
15/* load test only. not used */
16SEC("syscall")
17int not_used(void *ctx)
18{
19	struct value_lock_type *ptr;
20	struct task_struct *task;
21	struct user_data *udata;
22
23	task = bpf_get_current_task_btf();
24	ptr = bpf_task_storage_get(&datamap, task, 0, 0);
25	if (!ptr)
26		return 0;
27
28	bpf_spin_lock(&ptr->lock);
29
30	udata = ptr->udata;
31	if (!udata) {
32		bpf_spin_unlock(&ptr->lock);
33		return 0;
34	}
35	udata->result = MAGIC_VALUE + udata->a + udata->b;
36
37	bpf_spin_unlock(&ptr->lock);
38
39	return 0;
40}
41
42char _license[] SEC("license") = "GPL";