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selftests/bpf: Ensure fentry prog cannot attach to bpf_spin_{lock,unlcok}()

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Add two tests to ensure fentry programs cannot attach to
bpf_spin_{lock,unlock}() helpers. The tracing_failure.c files
can be used in the future for other tracing failure cases.

Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240207070107.335341-1-yonghong.song@linux.dev
This commit is contained in:
Yonghong Song 2024-02-06 23:01:07 -08:00 committed by Andrii Nakryiko
parent 178c54666f
commit fc1c9e40da
2 changed files with 57 additions and 0 deletions
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37
tools/testing/selftests/bpf/prog_tests/tracing_failure.c Normal file
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@ -0,0 +1,37 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
#include <test_progs.h>
#include "tracing_failure.skel.h"
static void test_bpf_spin_lock(bool is_spin_lock)
{
struct tracing_failure *skel;
int err;
skel = tracing_failure__open();
if (!ASSERT_OK_PTR(skel, "tracing_failure__open"))
return;
if (is_spin_lock)
bpf_program__set_autoload(skel->progs.test_spin_lock, true);
else
bpf_program__set_autoload(skel->progs.test_spin_unlock, true);
err = tracing_failure__load(skel);
if (!ASSERT_OK(err, "tracing_failure__load"))
goto out;
err = tracing_failure__attach(skel);
ASSERT_ERR(err, "tracing_failure__attach");
out:
tracing_failure__destroy(skel);
}
void test_tracing_failure(void)
{
if (test__start_subtest("bpf_spin_lock"))
test_bpf_spin_lock(true);
if (test__start_subtest("bpf_spin_unlock"))
test_bpf_spin_lock(false);
}

20
tools/testing/selftests/bpf/progs/tracing_failure.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
char _license[] SEC("license") = "GPL";
SEC("?fentry/bpf_spin_lock")
int BPF_PROG(test_spin_lock, struct bpf_spin_lock *lock)
{
return 0;
}
SEC("?fentry/bpf_spin_unlock")
int BPF_PROG(test_spin_unlock, struct bpf_spin_lock *lock)
{
return 0;
}