From 9271a0c7ae7a914782759d8fe22ef28fffab82fe Mon Sep 17 00:00:00 2001 From: Jiri Olsa Date: Wed, 16 Mar 2022 13:24:18 +0100 Subject: [PATCH] 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 Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20220316122419.933957-13-jolsa@kernel.org --- .../bpf/prog_tests/kprobe_multi_test.c | 204 +++++++++++++++++- 1 file changed, 193 insertions(+), 11 deletions(-) diff --git a/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c b/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c index ded6b8c8ec05..b9876b55fc0c 100644 --- a/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c +++ b/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c @@ -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; @@ -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) @@ -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); @@ -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) @@ -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")) @@ -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(); }