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selftests/bpf: Add kprobe_multi override test 

Adding test that tries to attach program with bpf_override_return
helper to function not within error injection list.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20230907200652.926951-2-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2023-09-07 22:06:52 +02:00 committed by Andrii Nakryiko
parent 41bc46c12a
commit 7182e56411
2 changed files with 50 additions and 0 deletions
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37
tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c
View File

@ -3,6 +3,7 @@
#include "kprobe_multi.skel.h"
#include "trace_helpers.h"
#include "kprobe_multi_empty.skel.h"
#include "kprobe_multi_override.skel.h"
#include "bpf/libbpf_internal.h"
#include "bpf/hashmap.h"
@ -453,6 +454,40 @@ cleanup:
}
}
void test_attach_override(void)
{
struct kprobe_multi_override *skel = NULL;
struct bpf_link *link = NULL;
skel = kprobe_multi_override__open_and_load();
if (!ASSERT_OK_PTR(skel, "kprobe_multi_empty__open_and_load"))
goto cleanup;
/* The test_override calls bpf_override_return so it should fail
* to attach to bpf_fentry_test1 function, which is not on error
* injection list.
*/
link = bpf_program__attach_kprobe_multi_opts(skel->progs.test_override,
"bpf_fentry_test1", NULL);
if (!ASSERT_ERR_PTR(link, "override_attached_bpf_fentry_test1")) {
bpf_link__destroy(link);
goto cleanup;
}
/* The should_fail_bio function is on error injection list,
* attach should succeed.
*/
link = bpf_program__attach_kprobe_multi_opts(skel->progs.test_override,
"should_fail_bio", NULL);
if (!ASSERT_OK_PTR(link, "override_attached_should_fail_bio"))
goto cleanup;
bpf_link__destroy(link);
cleanup:
kprobe_multi_override__destroy(skel);
}
void serial_test_kprobe_multi_bench_attach(void)
{
if (test__start_subtest("kernel"))
@ -480,4 +515,6 @@ void test_kprobe_multi_test(void)
test_attach_api_syms();
if (test__start_subtest("attach_api_fails"))
test_attach_api_fails();
if (test__start_subtest("attach_override"))
test_attach_override();
}

13
tools/testing/selftests/bpf/progs/kprobe_multi_override.c Normal file
View File

@ -0,0 +1,13 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
char _license[] SEC("license") = "GPL";
SEC("kprobe.multi")
int test_override(struct pt_regs *ctx)
{
bpf_override_return(ctx, 123);
return 0;
}