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selftests/bpf: Ensure the unsupported struct_ops prog cannot be loaded

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There is an existing "bpf_tcp_ca/unsupp_cong_op" test to ensure
the unsupported tcp-cc "get_info" struct_ops prog cannot be loaded.

This patch adds a new test in the bpf_testmod such that the
unsupported ops test does not depend on other kernel subsystem
where its supporting ops may be changed in the future.

Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20240722183049.2254692-4-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
This commit is contained in:
Martin KaFai Lau 2024-07-22 11:30:47 -07:00 committed by Andrii Nakryiko
parent e44b4fc40c
commit 4009c95fed
3 changed files with 25 additions and 0 deletions
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1
tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.h
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@ -35,6 +35,7 @@ struct bpf_testmod_ops {
void (*test_2)(int a, int b);
/* Used to test nullable arguments. */
int (*test_maybe_null)(int dummy, struct task_struct *task);
int (*unsupported_ops)(void);
/* The following fields are used to test shadow copies. */
char onebyte;

2
tools/testing/selftests/bpf/prog_tests/test_struct_ops_module.c
View File

@ -9,6 +9,7 @@
#include "struct_ops_nulled_out_cb.skel.h"
#include "struct_ops_forgotten_cb.skel.h"
#include "struct_ops_detach.skel.h"
#include "unsupported_ops.skel.h"
static void check_map_info(struct bpf_map_info *info)
{
@ -311,5 +312,6 @@ void serial_test_struct_ops_module(void)
test_struct_ops_forgotten_cb();
if (test__start_subtest("test_detach_link"))
test_detach_link();
RUN_TESTS(unsupported_ops);
}

22
tools/testing/selftests/bpf/progs/unsupported_ops.c Normal file
View File

@ -0,0 +1,22 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
#include <vmlinux.h>
#include <bpf/bpf_tracing.h>
#include "bpf_misc.h"
#include "../bpf_testmod/bpf_testmod.h"
char _license[] SEC("license") = "GPL";
SEC("struct_ops/unsupported_ops")
__failure
__msg("attach to unsupported member unsupported_ops of struct bpf_testmod_ops")
int BPF_PROG(unsupported_ops)
{
return 0;
}
SEC(".struct_ops.link")
struct bpf_testmod_ops testmod = {
.unsupported_ops = (void *)unsupported_ops,
};