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// SPDX-License-Identifier: GPL-2.0
#include <vmlinux.h>
#include <bpf/bpf_helpers.h>
#include "bpf_experimental.h"
#include "bpf_misc.h"
struct test_empty_event {};
struct test_flex_batch {
int nr;
struct test_empty_event events[];
};
struct map_value {
struct test_flex_batch __kptr *batch;
};
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__type(key, int);
__type(value, struct map_value);
__uint(max_entries, 1);
} batches SEC(".maps");
SEC("syscall")
__description("btf walk into flexible array of zero-sized elements")
__failure __msg("access beyond struct test_flex_batch at off 4 size 1")
int stash_and_peek(void *ctx)
{
struct test_flex_batch *b, *old;
struct map_value *v;
int key = 0;
v = bpf_map_lookup_elem(&batches, &key);
if (!v)
return 0;
b = bpf_obj_new(struct test_flex_batch);
if (!b)
return 0;
b->nr = 1;
old = bpf_kptr_xchg(&v->batch, b);
if (old)
bpf_obj_drop(old);
b = v->batch;
if (!b)
return 0;
return b->nr + *(char *)&b->events[0];
}
char _license[] SEC("license") = "GPL";
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