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 "bpf_experimental.h"
  7#include "bpf_misc.h"
  8#include "uptr_test_common.h"
  9
 10struct {
 11	__uint(type, BPF_MAP_TYPE_TASK_STORAGE);
 12	__uint(map_flags, BPF_F_NO_PREALLOC);
 13	__type(key, int);
 14	__type(value, struct value_type);
 15} datamap SEC(".maps");
 16
 17SEC("?syscall")
 18__failure __msg("store to uptr disallowed")
 19int uptr_write(const void *ctx)
 20{
 21	struct task_struct *task;
 22	struct value_type *v;
 23
 24	task = bpf_get_current_task_btf();
 25	v = bpf_task_storage_get(&datamap, task, 0,
 26				 BPF_LOCAL_STORAGE_GET_F_CREATE);
 27	if (!v)
 28		return 0;
 29
 30	v->udata = NULL;
 31	return 0;
 32}
 33
 34SEC("?syscall")
 35__failure __msg("store to uptr disallowed")
 36int uptr_write_nested(const void *ctx)
 37{
 38	struct task_struct *task;
 39	struct value_type *v;
 40
 41	task = bpf_get_current_task_btf();
 42	v = bpf_task_storage_get(&datamap, task, 0,
 43				 BPF_LOCAL_STORAGE_GET_F_CREATE);
 44	if (!v)
 45		return 0;
 46
 47	v->nested.udata = NULL;
 48	return 0;
 49}
 50
 51SEC("?syscall")
 52__failure __msg("R1 invalid mem access 'mem_or_null'")
 53int uptr_no_null_check(const void *ctx)
 54{
 55	struct task_struct *task;
 56	struct value_type *v;
 57
 58	task = bpf_get_current_task_btf();
 59	v = bpf_task_storage_get(&datamap, task, 0,
 60				 BPF_LOCAL_STORAGE_GET_F_CREATE);
 61	if (!v)
 62		return 0;
 63
 64	v->udata->result = 0;
 65
 66	return 0;
 67}
 68
 69SEC("?syscall")
 70__failure __msg("doesn't point to kptr")
 71int uptr_kptr_xchg(const void *ctx)
 72{
 73	struct task_struct *task;
 74	struct value_type *v;
 75
 76	task = bpf_get_current_task_btf();
 77	v = bpf_task_storage_get(&datamap, task, 0,
 78				 BPF_LOCAL_STORAGE_GET_F_CREATE);
 79	if (!v)
 80		return 0;
 81
 82	bpf_kptr_xchg(&v->udata, NULL);
 83
 84	return 0;
 85}
 86
 87SEC("?syscall")
 88__failure __msg("invalid mem access 'scalar'")
 89int uptr_obj_new(const void *ctx)
 90{
 91	struct value_type *v;
 92
 93	v = bpf_obj_new(typeof(*v));
 94	if (!v)
 95		return 0;
 96
 97	if (v->udata)
 98		v->udata->result = 0;
 99
100	bpf_obj_drop(v);
101
102	return 0;
103}
104
105char _license[] SEC("license") = "GPL";