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[213.175.37.12]) by smtp.gmail.com with ESMTPSA id kw5sm8493321ejc.140.2022.02.02.05.54.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Feb 2022 05:54:24 -0800 (PST) From: Jiri Olsa X-Google-Original-From: Jiri Olsa To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Masami Hiramatsu Cc: netdev@vger.kernel.org, bpf@vger.kernel.org, lkml , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Steven Rostedt , Jiri Olsa Subject: [PATCH 8/8] selftest/bpf: Add fprobe test for bpf_cookie values Date: Wed, 2 Feb 2022 14:53:33 +0100 Message-Id: <20220202135333.190761-9-jolsa@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220202135333.190761-1-jolsa@kernel.org> References: <20220202135333.190761-1-jolsa@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Adding bpf_cookie test for kprobe attached by fprobe link. Signed-off-by: Jiri Olsa --- .../selftests/bpf/prog_tests/bpf_cookie.c | 73 +++++++++++++++++++ .../selftests/bpf/progs/fprobe_bpf_cookie.c | 62 ++++++++++++++++ 2 files changed, 135 insertions(+) create mode 100644 tools/testing/selftests/bpf/progs/fprobe_bpf_cookie.c diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c b/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c index cd10df6cd0fc..bf70d859c598 100644 --- a/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c +++ b/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c @@ -7,6 +7,7 @@ #include #include #include "test_bpf_cookie.skel.h" +#include "fprobe_bpf_cookie.skel.h" /* uprobe attach point */ static void trigger_func(void) @@ -63,6 +64,76 @@ static void kprobe_subtest(struct test_bpf_cookie *skel) bpf_link__destroy(retlink2); } +static void fprobe_subtest(void) +{ + DECLARE_LIBBPF_OPTS(bpf_link_create_opts, opts); + int err, prog_fd, link1_fd = -1, link2_fd = -1; + struct fprobe_bpf_cookie *skel = NULL; + __u32 duration = 0, retval; + __u64 addrs[8], cookies[8]; + + skel = fprobe_bpf_cookie__open_and_load(); + if (!ASSERT_OK_PTR(skel, "fentry_raw_skel_load")) + goto cleanup; + + kallsyms_find("bpf_fentry_test1", &addrs[0]); + kallsyms_find("bpf_fentry_test2", &addrs[1]); + kallsyms_find("bpf_fentry_test3", &addrs[2]); + kallsyms_find("bpf_fentry_test4", &addrs[3]); + kallsyms_find("bpf_fentry_test5", &addrs[4]); + kallsyms_find("bpf_fentry_test6", &addrs[5]); + kallsyms_find("bpf_fentry_test7", &addrs[6]); + kallsyms_find("bpf_fentry_test8", &addrs[7]); + + cookies[0] = 1; + cookies[1] = 2; + cookies[2] = 3; + cookies[3] = 4; + cookies[4] = 5; + cookies[5] = 6; + cookies[6] = 7; + cookies[7] = 8; + + opts.fprobe.addrs = (__u64) &addrs; + opts.fprobe.cnt = 8; + opts.fprobe.bpf_cookies = (__u64) &cookies; + prog_fd = bpf_program__fd(skel->progs.test2); + + link1_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_FPROBE, &opts); + if (!ASSERT_GE(link1_fd, 0, "link1_fd")) + return; + + cookies[0] = 8; + cookies[1] = 7; + cookies[2] = 6; + cookies[3] = 5; + cookies[4] = 4; + cookies[5] = 3; + cookies[6] = 2; + cookies[7] = 1; + + opts.flags = BPF_F_FPROBE_RETURN; + prog_fd = bpf_program__fd(skel->progs.test3); + + link2_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_FPROBE, &opts); + if (!ASSERT_GE(link2_fd, 0, "link2_fd")) + goto cleanup; + + prog_fd = bpf_program__fd(skel->progs.test1); + err = bpf_prog_test_run(prog_fd, 1, NULL, 0, + NULL, NULL, &retval, &duration); + ASSERT_OK(err, "test_run"); + ASSERT_EQ(retval, 0, "test_run"); + + ASSERT_EQ(skel->bss->test2_result, 8, "test2_result"); + ASSERT_EQ(skel->bss->test3_result, 8, "test3_result"); + +cleanup: + close(link1_fd); + close(link2_fd); + fprobe_bpf_cookie__destroy(skel); +} + static void uprobe_subtest(struct test_bpf_cookie *skel) { DECLARE_LIBBPF_OPTS(bpf_uprobe_opts, opts); @@ -249,6 +320,8 @@ void test_bpf_cookie(void) if (test__start_subtest("kprobe")) kprobe_subtest(skel); + if (test__start_subtest("rawkprobe")) + fprobe_subtest(); if (test__start_subtest("uprobe")) uprobe_subtest(skel); if (test__start_subtest("tracepoint")) diff --git a/tools/testing/selftests/bpf/progs/fprobe_bpf_cookie.c b/tools/testing/selftests/bpf/progs/fprobe_bpf_cookie.c new file mode 100644 index 000000000000..42cb109e5a30 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/fprobe_bpf_cookie.c @@ -0,0 +1,62 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include + +char _license[] SEC("license") = "GPL"; + +extern const void bpf_fentry_test1 __ksym; +extern const void bpf_fentry_test2 __ksym; +extern const void bpf_fentry_test3 __ksym; +extern const void bpf_fentry_test4 __ksym; +extern const void bpf_fentry_test5 __ksym; +extern const void bpf_fentry_test6 __ksym; +extern const void bpf_fentry_test7 __ksym; +extern const void bpf_fentry_test8 __ksym; + +/* No tests, just to trigger bpf_fentry_test* through tracing test_run */ +SEC("fentry/bpf_modify_return_test") +int BPF_PROG(test1) +{ + return 0; +} + +__u64 test2_result = 0; + +SEC("kprobe/bpf_fentry_test*") +int test2(struct pt_regs *ctx) +{ + __u64 cookie = bpf_get_attach_cookie(ctx); + __u64 addr = bpf_get_func_ip(ctx); + + test2_result += (const void *) addr == &bpf_fentry_test1 && cookie == 1; + test2_result += (const void *) addr == &bpf_fentry_test2 && cookie == 2; + test2_result += (const void *) addr == &bpf_fentry_test3 && cookie == 3; + test2_result += (const void *) addr == &bpf_fentry_test4 && cookie == 4; + test2_result += (const void *) addr == &bpf_fentry_test5 && cookie == 5; + test2_result += (const void *) addr == &bpf_fentry_test6 && cookie == 6; + test2_result += (const void *) addr == &bpf_fentry_test7 && cookie == 7; + test2_result += (const void *) addr == &bpf_fentry_test8 && cookie == 8; + + return 0; +} + +__u64 test3_result = 0; + +SEC("kretprobe/bpf_fentry_test*") +int test3(struct pt_regs *ctx) +{ + __u64 cookie = bpf_get_attach_cookie(ctx); + __u64 addr = bpf_get_func_ip(ctx); + + test3_result += (const void *) addr == &bpf_fentry_test1 && cookie == 8; + test3_result += (const void *) addr == &bpf_fentry_test2 && cookie == 7; + test3_result += (const void *) addr == &bpf_fentry_test3 && cookie == 6; + test3_result += (const void *) addr == &bpf_fentry_test4 && cookie == 5; + test3_result += (const void *) addr == &bpf_fentry_test5 && cookie == 4; + test3_result += (const void *) addr == &bpf_fentry_test6 && cookie == 3; + test3_result += (const void *) addr == &bpf_fentry_test7 && cookie == 2; + test3_result += (const void *) addr == &bpf_fentry_test8 && cookie == 1; + + return 0; +} -- 2.34.1