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selftests/bpf: Add attach test for bpf_program__attach_kprobe_multi_opts
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Adding tests for bpf_program__attach_kprobe_multi_opts function,
that test attach with pattern, symbols and addrs.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
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@olsajiri
olsajiri authored and Nobody committed Mar 17, 2022
1 parent 6e180af commit 21d6bd0
Showing 1 changed file with 193 additions and 11 deletions.
204 changes: 193 additions & 11 deletions tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,7 @@
#include "kprobe_multi.skel.h"
#include "trace_helpers.h"

static void kprobe_multi_test_run(struct kprobe_multi *skel)
static void kprobe_multi_test_run(struct kprobe_multi *skel, bool test_return)
{
LIBBPF_OPTS(bpf_test_run_opts, topts);
int err, prog_fd;
Expand All @@ -22,14 +22,16 @@ static void kprobe_multi_test_run(struct kprobe_multi *skel)
ASSERT_EQ(skel->bss->kprobe_test7_result, 1, "kprobe_test7_result");
ASSERT_EQ(skel->bss->kprobe_test8_result, 1, "kprobe_test8_result");

ASSERT_EQ(skel->bss->kretprobe_test1_result, 1, "kretprobe_test1_result");
ASSERT_EQ(skel->bss->kretprobe_test2_result, 1, "kretprobe_test2_result");
ASSERT_EQ(skel->bss->kretprobe_test3_result, 1, "kretprobe_test3_result");
ASSERT_EQ(skel->bss->kretprobe_test4_result, 1, "kretprobe_test4_result");
ASSERT_EQ(skel->bss->kretprobe_test5_result, 1, "kretprobe_test5_result");
ASSERT_EQ(skel->bss->kretprobe_test6_result, 1, "kretprobe_test6_result");
ASSERT_EQ(skel->bss->kretprobe_test7_result, 1, "kretprobe_test7_result");
ASSERT_EQ(skel->bss->kretprobe_test8_result, 1, "kretprobe_test8_result");
if (test_return) {
ASSERT_EQ(skel->bss->kretprobe_test1_result, 1, "kretprobe_test1_result");
ASSERT_EQ(skel->bss->kretprobe_test2_result, 1, "kretprobe_test2_result");
ASSERT_EQ(skel->bss->kretprobe_test3_result, 1, "kretprobe_test3_result");
ASSERT_EQ(skel->bss->kretprobe_test4_result, 1, "kretprobe_test4_result");
ASSERT_EQ(skel->bss->kretprobe_test5_result, 1, "kretprobe_test5_result");
ASSERT_EQ(skel->bss->kretprobe_test6_result, 1, "kretprobe_test6_result");
ASSERT_EQ(skel->bss->kretprobe_test7_result, 1, "kretprobe_test7_result");
ASSERT_EQ(skel->bss->kretprobe_test8_result, 1, "kretprobe_test8_result");
}
}

static void test_skel_api(void)
Expand All @@ -46,7 +48,7 @@ static void test_skel_api(void)
if (!ASSERT_OK(err, "kprobe_multi__attach"))
goto cleanup;

kprobe_multi_test_run(skel);
kprobe_multi_test_run(skel, true);

cleanup:
kprobe_multi__destroy(skel);
Expand All @@ -73,7 +75,7 @@ static void test_link_api(struct bpf_link_create_opts *opts)
if (!ASSERT_GE(link2_fd, 0, "link_fd"))
goto cleanup;

kprobe_multi_test_run(skel);
kprobe_multi_test_run(skel, true);

cleanup:
if (link1_fd != -1)
Expand Down Expand Up @@ -127,6 +129,178 @@ static void test_link_api_syms(void)
test_link_api(&opts);
}

static void
test_attach_api(const char *pattern, struct bpf_kprobe_multi_opts *opts)
{
struct bpf_link *link1 = NULL, *link2 = NULL;
struct kprobe_multi *skel = NULL;

skel = kprobe_multi__open_and_load();
if (!ASSERT_OK_PTR(skel, "fentry_raw_skel_load"))
goto cleanup;

skel->bss->pid = getpid();
link1 = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kprobe,
pattern, opts);
if (!ASSERT_OK_PTR(link1, "bpf_program__attach_kprobe_multi_opts"))
goto cleanup;

if (opts) {
opts->retprobe = true;
link2 = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kretprobe,
pattern, opts);
if (!ASSERT_OK_PTR(link2, "bpf_program__attach_kprobe_multi_opts"))
goto cleanup;
}

kprobe_multi_test_run(skel, !!opts);

cleanup:
bpf_link__destroy(link2);
bpf_link__destroy(link1);
kprobe_multi__destroy(skel);
}

static void test_attach_api_pattern(void)
{
LIBBPF_OPTS(bpf_kprobe_multi_opts, opts);

test_attach_api("bpf_fentry_test*", &opts);
test_attach_api("bpf_fentry_test?", NULL);
}

static void test_attach_api_addrs(void)
{
LIBBPF_OPTS(bpf_kprobe_multi_opts, opts);
unsigned long long addrs[8];

GET_ADDR("bpf_fentry_test1", addrs[0]);
GET_ADDR("bpf_fentry_test2", addrs[1]);
GET_ADDR("bpf_fentry_test3", addrs[2]);
GET_ADDR("bpf_fentry_test4", addrs[3]);
GET_ADDR("bpf_fentry_test5", addrs[4]);
GET_ADDR("bpf_fentry_test6", addrs[5]);
GET_ADDR("bpf_fentry_test7", addrs[6]);
GET_ADDR("bpf_fentry_test8", addrs[7]);

opts.addrs = (const unsigned long *) addrs;
opts.cnt = ARRAY_SIZE(addrs);
test_attach_api(NULL, &opts);
}

static void test_attach_api_syms(void)
{
LIBBPF_OPTS(bpf_kprobe_multi_opts, opts);
const char *syms[8] = {
"bpf_fentry_test1",
"bpf_fentry_test2",
"bpf_fentry_test3",
"bpf_fentry_test4",
"bpf_fentry_test5",
"bpf_fentry_test6",
"bpf_fentry_test7",
"bpf_fentry_test8",
};

opts.syms = syms;
opts.cnt = ARRAY_SIZE(syms);
test_attach_api(NULL, &opts);
}

static void test_attach_api_fails(void)
{
LIBBPF_OPTS(bpf_kprobe_multi_opts, opts);
struct kprobe_multi *skel = NULL;
struct bpf_link *link = NULL;
unsigned long long addrs[2];
const char *syms[2] = {
"bpf_fentry_test1",
"bpf_fentry_test2",
};
__u64 cookies[2];

addrs[0] = ksym_get_addr("bpf_fentry_test1");
addrs[1] = ksym_get_addr("bpf_fentry_test2");

if (!ASSERT_FALSE(!addrs[0] || !addrs[1], "ksym_get_addr"))
goto cleanup;

skel = kprobe_multi__open_and_load();
if (!ASSERT_OK_PTR(skel, "fentry_raw_skel_load"))
goto cleanup;

skel->bss->pid = getpid();

/* fail_1 - pattern and opts NULL */
link = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kprobe,
NULL, NULL);
if (!ASSERT_ERR_PTR(link, "fail_1"))
goto cleanup;

if (!ASSERT_EQ(libbpf_get_error(link), -EINVAL, "fail_1_error"))
goto cleanup;

/* fail_2 - both addrs and syms set */
opts.addrs = (const unsigned long *) addrs;
opts.syms = syms;
opts.cnt = ARRAY_SIZE(syms);
opts.cookies = NULL;

link = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kprobe,
NULL, &opts);
if (!ASSERT_ERR_PTR(link, "fail_2"))
goto cleanup;

if (!ASSERT_EQ(libbpf_get_error(link), -EINVAL, "fail_2_error"))
goto cleanup;

/* fail_3 - pattern and addrs set */
opts.addrs = (const unsigned long *) addrs;
opts.syms = NULL;
opts.cnt = ARRAY_SIZE(syms);
opts.cookies = NULL;

link = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kprobe,
"ksys_*", &opts);
if (!ASSERT_ERR_PTR(link, "fail_3"))
goto cleanup;

if (!ASSERT_EQ(libbpf_get_error(link), -EINVAL, "fail_3_error"))
goto cleanup;

/* fail_4 - pattern and cnt set */
opts.addrs = NULL;
opts.syms = NULL;
opts.cnt = ARRAY_SIZE(syms);
opts.cookies = NULL;

link = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kprobe,
"ksys_*", &opts);
if (!ASSERT_ERR_PTR(link, "fail_4"))
goto cleanup;

if (!ASSERT_EQ(libbpf_get_error(link), -EINVAL, "fail_4_error"))
goto cleanup;

/* fail_5 - pattern and cookies */
opts.addrs = NULL;
opts.syms = NULL;
opts.cnt = 0;
opts.cookies = cookies;

link = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kprobe,
"ksys_*", &opts);
if (!ASSERT_ERR_PTR(link, "fail_5"))
goto cleanup;

if (!ASSERT_EQ(libbpf_get_error(link), -EINVAL, "fail_5_error"))
goto cleanup;

cleanup:
bpf_link__destroy(link);
kprobe_multi__destroy(skel);
}

void test_kprobe_multi_test(void)
{
if (!ASSERT_OK(load_kallsyms(), "load_kallsyms"))
Expand All @@ -138,4 +312,12 @@ void test_kprobe_multi_test(void)
test_link_api_syms();
if (test__start_subtest("link_api_syms"))
test_link_api_addrs();
if (test__start_subtest("attach_api_pattern"))
test_attach_api_pattern();
if (test__start_subtest("attach_api_addrs"))
test_attach_api_addrs();
if (test__start_subtest("attach_api_syms"))
test_attach_api_syms();
if (test__start_subtest("attach_api_fails"))
test_attach_api_fails();
}

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