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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2025 Meta */
#include <test_progs.h>
#include "clone_attach_btf_id.skel.h"
/*
* Test that bpf_program__clone() respects caller-provided attach_btf_id
* override via bpf_prog_load_opts.
*
* The BPF program has SEC("fentry/bpf_fentry_test1"). Clone it twice
* from the same prepared object: first with no opts (callback resolves
* attach_btf_id from sec_name), then with attach_btf_id overridden to
* bpf_fentry_test2. Verify each loaded program's attach_btf_id via
* bpf_prog_get_info_by_fd().
*/
static int get_prog_attach_btf_id(int prog_fd)
{
struct bpf_prog_info info = {};
__u32 info_len = sizeof(info);
int err;
err = bpf_prog_get_info_by_fd(prog_fd, &info, &info_len);
if (err)
return err;
return info.attach_btf_id;
}
void test_clone_attach_btf_id(void)
{
struct clone_attach_btf_id *skel;
int fd1 = -1, fd2 = -1, err;
int btf_id_test1, btf_id_test2;
btf_id_test1 = libbpf_find_vmlinux_btf_id("bpf_fentry_test1", BPF_TRACE_FENTRY);
if (!ASSERT_GT(btf_id_test1, 0, "find_btf_id_test1"))
return;
btf_id_test2 = libbpf_find_vmlinux_btf_id("bpf_fentry_test2", BPF_TRACE_FENTRY);
if (!ASSERT_GT(btf_id_test2, 0, "find_btf_id_test2"))
return;
skel = clone_attach_btf_id__open();
if (!ASSERT_OK_PTR(skel, "skel_open"))
return;
err = bpf_object__prepare(skel->obj);
if (!ASSERT_OK(err, "obj_prepare"))
goto out;
/* Clone with no opts — callback resolves BTF from sec_name */
fd1 = bpf_program__clone(skel->progs.fentry_handler, NULL);
if (!ASSERT_GE(fd1, 0, "clone_default"))
goto out;
ASSERT_EQ(get_prog_attach_btf_id(fd1), btf_id_test1,
"attach_btf_id_default");
/*
* Clone with attach_btf_id override pointing to a different
* function. The BPF program never accesses arguments, so the
* load succeeds regardless of signature mismatch.
*/
LIBBPF_OPTS(bpf_prog_load_opts, opts,
.attach_btf_id = btf_id_test2,
);
fd2 = bpf_program__clone(skel->progs.fentry_handler, &opts);
if (!ASSERT_GE(fd2, 0, "clone_override"))
goto out;
ASSERT_EQ(get_prog_attach_btf_id(fd2), btf_id_test2,
"attach_btf_id_override");
out:
if (fd1 >= 0)
close(fd1);
if (fd2 >= 0)
close(fd2);
clone_attach_btf_id__destroy(skel);
}
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