86 lines
1.8 KiB
C
86 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
|
|
|
|
#include <vmlinux.h>
|
|
#include <bpf/bpf_helpers.h>
|
|
#include <bpf/bpf_tracing.h>
|
|
#include <bpf/bpf_core_read.h>
|
|
#include "../bpf_experimental.h"
|
|
#include "bpf_misc.h"
|
|
|
|
struct node_data {
|
|
long key;
|
|
long data;
|
|
struct bpf_rb_node node;
|
|
};
|
|
|
|
struct map_value {
|
|
struct node_data __kptr *node;
|
|
};
|
|
|
|
struct node_data2 {
|
|
long key[4];
|
|
};
|
|
|
|
/* This is necessary so that LLVM generates BTF for node_data struct
|
|
* If it's not included, a fwd reference for node_data will be generated but
|
|
* no struct. Example BTF of "node" field in map_value when not included:
|
|
*
|
|
* [10] PTR '(anon)' type_id=35
|
|
* [34] FWD 'node_data' fwd_kind=struct
|
|
* [35] TYPE_TAG 'kptr_ref' type_id=34
|
|
*/
|
|
struct node_data *just_here_because_btf_bug;
|
|
|
|
struct {
|
|
__uint(type, BPF_MAP_TYPE_ARRAY);
|
|
__type(key, int);
|
|
__type(value, struct map_value);
|
|
__uint(max_entries, 2);
|
|
} some_nodes SEC(".maps");
|
|
|
|
SEC("tc")
|
|
__failure __msg("invalid kptr access, R2 type=ptr_node_data2 expected=ptr_node_data")
|
|
long stash_rb_nodes(void *ctx)
|
|
{
|
|
struct map_value *mapval;
|
|
struct node_data2 *res;
|
|
int idx = 0;
|
|
|
|
mapval = bpf_map_lookup_elem(&some_nodes, &idx);
|
|
if (!mapval)
|
|
return 1;
|
|
|
|
res = bpf_obj_new(typeof(*res));
|
|
if (!res)
|
|
return 1;
|
|
res->key[0] = 40;
|
|
|
|
res = bpf_kptr_xchg(&mapval->node, res);
|
|
if (res)
|
|
bpf_obj_drop(res);
|
|
return 0;
|
|
}
|
|
|
|
SEC("tc")
|
|
__failure __msg("R1 must have zero offset when passed to release func")
|
|
long drop_rb_node_off(void *ctx)
|
|
{
|
|
struct map_value *mapval;
|
|
struct node_data *res;
|
|
int idx = 0;
|
|
|
|
mapval = bpf_map_lookup_elem(&some_nodes, &idx);
|
|
if (!mapval)
|
|
return 1;
|
|
|
|
res = bpf_obj_new(typeof(*res));
|
|
if (!res)
|
|
return 1;
|
|
/* Try releasing with graph node offset */
|
|
bpf_obj_drop(&res->node);
|
|
return 0;
|
|
}
|
|
|
|
char _license[] SEC("license") = "GPL";
|