106 lines
2.0 KiB
C
106 lines
2.0 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
|
||
|
|
|
||
|
|
#include <vmlinux.h>
|
||
|
|
#include <bpf/bpf_helpers.h>
|
||
|
|
#include "bpf_experimental.h"
|
||
|
|
#include "bpf_misc.h"
|
||
|
|
#include "uptr_test_common.h"
|
||
|
|
|
||
|
|
struct {
|
||
|
|
__uint(type, BPF_MAP_TYPE_TASK_STORAGE);
|
||
|
|
__uint(map_flags, BPF_F_NO_PREALLOC);
|
||
|
|
__type(key, int);
|
||
|
|
__type(value, struct value_type);
|
||
|
|
} datamap SEC(".maps");
|
||
|
|
|
||
|
|
SEC("?syscall")
|
||
|
|
__failure __msg("store to uptr disallowed")
|
||
|
|
int uptr_write(const void *ctx)
|
||
|
|
{
|
||
|
|
struct task_struct *task;
|
||
|
|
struct value_type *v;
|
||
|
|
|
||
|
|
task = bpf_get_current_task_btf();
|
||
|
|
v = bpf_task_storage_get(&datamap, task, 0,
|
||
|
|
BPF_LOCAL_STORAGE_GET_F_CREATE);
|
||
|
|
if (!v)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
v->udata = NULL;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
SEC("?syscall")
|
||
|
|
__failure __msg("store to uptr disallowed")
|
||
|
|
int uptr_write_nested(const void *ctx)
|
||
|
|
{
|
||
|
|
struct task_struct *task;
|
||
|
|
struct value_type *v;
|
||
|
|
|
||
|
|
task = bpf_get_current_task_btf();
|
||
|
|
v = bpf_task_storage_get(&datamap, task, 0,
|
||
|
|
BPF_LOCAL_STORAGE_GET_F_CREATE);
|
||
|
|
if (!v)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
v->nested.udata = NULL;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
SEC("?syscall")
|
||
|
|
__failure __msg("R1 invalid mem access 'mem_or_null'")
|
||
|
|
int uptr_no_null_check(const void *ctx)
|
||
|
|
{
|
||
|
|
struct task_struct *task;
|
||
|
|
struct value_type *v;
|
||
|
|
|
||
|
|
task = bpf_get_current_task_btf();
|
||
|
|
v = bpf_task_storage_get(&datamap, task, 0,
|
||
|
|
BPF_LOCAL_STORAGE_GET_F_CREATE);
|
||
|
|
if (!v)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
v->udata->result = 0;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
SEC("?syscall")
|
||
|
|
__failure __msg("doesn't point to kptr")
|
||
|
|
int uptr_kptr_xchg(const void *ctx)
|
||
|
|
{
|
||
|
|
struct task_struct *task;
|
||
|
|
struct value_type *v;
|
||
|
|
|
||
|
|
task = bpf_get_current_task_btf();
|
||
|
|
v = bpf_task_storage_get(&datamap, task, 0,
|
||
|
|
BPF_LOCAL_STORAGE_GET_F_CREATE);
|
||
|
|
if (!v)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
bpf_kptr_xchg(&v->udata, NULL);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
SEC("?syscall")
|
||
|
|
__failure __msg("invalid mem access 'scalar'")
|
||
|
|
int uptr_obj_new(const void *ctx)
|
||
|
|
{
|
||
|
|
struct value_type *v;
|
||
|
|
|
||
|
|
v = bpf_obj_new(typeof(*v));
|
||
|
|
if (!v)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
if (v->udata)
|
||
|
|
v->udata->result = 0;
|
||
|
|
|
||
|
|
bpf_obj_drop(v);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
char _license[] SEC("license") = "GPL";
|