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linux/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c
Jiri Olsa 9271a0c7ae selftests/bpf: Add attach test for bpf_program__attach_kprobe_multi_opts 
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>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220316122419.933957-13-jolsa@kernel.org
2022-03-17 20:17:19 -07:00

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// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include "kprobe_multi.skel.h"
#include "trace_helpers.h"
static void kprobe_multi_test_run(struct kprobe_multi *skel, bool test_return)
{
LIBBPF_OPTS(bpf_test_run_opts, topts);
int err, prog_fd;
prog_fd = bpf_program__fd(skel->progs.trigger);
err = bpf_prog_test_run_opts(prog_fd, &topts);
ASSERT_OK(err, "test_run");
ASSERT_EQ(topts.retval, 0, "test_run");
ASSERT_EQ(skel->bss->kprobe_test1_result, 1, "kprobe_test1_result");
ASSERT_EQ(skel->bss->kprobe_test2_result, 1, "kprobe_test2_result");
ASSERT_EQ(skel->bss->kprobe_test3_result, 1, "kprobe_test3_result");
ASSERT_EQ(skel->bss->kprobe_test4_result, 1, "kprobe_test4_result");
ASSERT_EQ(skel->bss->kprobe_test5_result, 1, "kprobe_test5_result");
ASSERT_EQ(skel->bss->kprobe_test6_result, 1, "kprobe_test6_result");
ASSERT_EQ(skel->bss->kprobe_test7_result, 1, "kprobe_test7_result");
ASSERT_EQ(skel->bss->kprobe_test8_result, 1, "kprobe_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)
{
struct kprobe_multi *skel = NULL;
int err;
skel = kprobe_multi__open_and_load();
if (!ASSERT_OK_PTR(skel, "kprobe_multi__open_and_load"))
goto cleanup;
skel->bss->pid = getpid();
err = kprobe_multi__attach(skel);
if (!ASSERT_OK(err, "kprobe_multi__attach"))
goto cleanup;
kprobe_multi_test_run(skel, true);
cleanup:
kprobe_multi__destroy(skel);
}
static void test_link_api(struct bpf_link_create_opts *opts)
{
int prog_fd, link1_fd = -1, link2_fd = -1;
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();
prog_fd = bpf_program__fd(skel->progs.test_kprobe);
link1_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_KPROBE_MULTI, opts);
if (!ASSERT_GE(link1_fd, 0, "link_fd"))
goto cleanup;
opts->kprobe_multi.flags = BPF_F_KPROBE_MULTI_RETURN;
prog_fd = bpf_program__fd(skel->progs.test_kretprobe);
link2_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_KPROBE_MULTI, opts);
if (!ASSERT_GE(link2_fd, 0, "link_fd"))
goto cleanup;
kprobe_multi_test_run(skel, true);
cleanup:
if (link1_fd != -1)
close(link1_fd);
if (link2_fd != -1)
close(link2_fd);
kprobe_multi__destroy(skel);
}
#define GET_ADDR(__sym, __addr) ({ \
__addr = ksym_get_addr(__sym); \
if (!ASSERT_NEQ(__addr, 0, "kallsyms load failed for " #__sym)) \
return; \
})
static void test_link_api_addrs(void)
{
LIBBPF_OPTS(bpf_link_create_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.kprobe_multi.addrs = (const unsigned long*) addrs;
opts.kprobe_multi.cnt = ARRAY_SIZE(addrs);
test_link_api(&opts);
}
static void test_link_api_syms(void)
{
LIBBPF_OPTS(bpf_link_create_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.kprobe_multi.syms = syms;
opts.kprobe_multi.cnt = ARRAY_SIZE(syms);
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"))
return;
if (test__start_subtest("skel_api"))
test_skel_api();
if (test__start_subtest("link_api_addrs"))
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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