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selftest/bpf: Add kprobe_multi attach test
Adding kprobe_multi attach test that uses new fprobe interface to attach kprobe program to multiple functions. The test is attaching programs to bpf_fentry_test* functions and uses single trampoline program bpf_prog_test_run to trigger bpf_fentry_test* functions. Signed-off-by: Jiri Olsa <[email protected]>
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‎tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c‎

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// SPDX-License-Identifier: GPL-2.0
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#include <test_progs.h>
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#include "kprobe_multi.skel.h"
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#include "trace_helpers.h"
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static void test_skel_api(void)
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{
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LIBBPF_OPTS(bpf_test_run_opts, topts);
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struct kprobe_multi *skel = NULL;
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int err, prog_fd;
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skel = kprobe_multi__open_and_load();
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if (!ASSERT_OK_PTR(skel, "kprobe_multi__open_and_load"))
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goto cleanup;
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err = kprobe_multi__attach(skel);
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if (!ASSERT_OK(err, "kprobe_multi__attach"))
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goto cleanup;
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prog_fd = bpf_program__fd(skel->progs.test1);
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err = bpf_prog_test_run_opts(prog_fd, &topts);
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ASSERT_OK(err, "test_run");
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ASSERT_EQ(topts.retval, 0, "test_run");
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ASSERT_EQ(skel->bss->test2_result, 8, "test2_result");
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ASSERT_EQ(skel->bss->test3_result, 8, "test3_result");
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cleanup:
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kprobe_multi__destroy(skel);
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}
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static void test_link_api(struct bpf_link_create_opts *opts)
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{
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LIBBPF_OPTS(bpf_test_run_opts, topts);
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int err, prog_fd, link1_fd = -1, link2_fd = -1;
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struct kprobe_multi *skel = NULL;
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skel = kprobe_multi__open_and_load();
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if (!ASSERT_OK_PTR(skel, "fentry_raw_skel_load"))
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goto cleanup;
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prog_fd = bpf_program__fd(skel->progs.test2);
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link1_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_KPROBE_MULTI, opts);
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if (!ASSERT_GE(link1_fd, 0, "link_fd"))
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goto cleanup;
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opts->kprobe_multi.flags = BPF_F_KPROBE_MULTI_RETURN;
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prog_fd = bpf_program__fd(skel->progs.test3);
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link2_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_KPROBE_MULTI, opts);
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if (!ASSERT_GE(link2_fd, 0, "link_fd"))
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goto cleanup;
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skel->bss->test2_result = 0;
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skel->bss->test3_result = 0;
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prog_fd = bpf_program__fd(skel->progs.test1);
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err = bpf_prog_test_run_opts(prog_fd, &topts);
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ASSERT_OK(err, "test_run");
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ASSERT_EQ(topts.retval, 0, "test_run");
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ASSERT_EQ(skel->bss->test2_result, 8, "test2_result");
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ASSERT_EQ(skel->bss->test3_result, 8, "test3_result");
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cleanup:
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if (link1_fd != -1)
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close(link1_fd);
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if (link2_fd != -1)
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close(link2_fd);
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kprobe_multi__destroy(skel);
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}
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static void test_link_api_addrs(void)
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{
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DECLARE_LIBBPF_OPTS(bpf_link_create_opts, opts);
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__u64 addrs[8];
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kallsyms_find("bpf_fentry_test1", &addrs[0]);
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kallsyms_find("bpf_fentry_test2", &addrs[1]);
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kallsyms_find("bpf_fentry_test3", &addrs[2]);
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kallsyms_find("bpf_fentry_test4", &addrs[3]);
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kallsyms_find("bpf_fentry_test5", &addrs[4]);
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kallsyms_find("bpf_fentry_test6", &addrs[5]);
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kallsyms_find("bpf_fentry_test7", &addrs[6]);
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kallsyms_find("bpf_fentry_test8", &addrs[7]);
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opts.kprobe_multi.addrs = (__u64) addrs;
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opts.kprobe_multi.cnt = 8;
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test_link_api(&opts);
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}
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static void test_link_api_syms(void)
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{
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DECLARE_LIBBPF_OPTS(bpf_link_create_opts, opts);
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const char *syms[8] = {
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"bpf_fentry_test1",
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"bpf_fentry_test2",
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"bpf_fentry_test3",
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"bpf_fentry_test4",
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"bpf_fentry_test5",
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"bpf_fentry_test6",
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"bpf_fentry_test7",
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"bpf_fentry_test8",
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};
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opts.kprobe_multi.syms = (__u64) syms;
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opts.kprobe_multi.cnt = 8;
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test_link_api(&opts);
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}
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void test_kprobe_multi_test(void)
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{
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test_skel_api();
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test_link_api_syms();
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test_link_api_addrs();
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}

‎tools/testing/selftests/bpf/progs/kprobe_multi.c‎

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// SPDX-License-Identifier: GPL-2.0
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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char _license[] SEC("license") = "GPL";
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extern const void bpf_fentry_test1 __ksym;
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extern const void bpf_fentry_test2 __ksym;
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extern const void bpf_fentry_test3 __ksym;
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extern const void bpf_fentry_test4 __ksym;
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extern const void bpf_fentry_test5 __ksym;
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extern const void bpf_fentry_test6 __ksym;
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extern const void bpf_fentry_test7 __ksym;
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extern const void bpf_fentry_test8 __ksym;
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/* No tests, just to trigger bpf_fentry_test* through tracing test_run */
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SEC("fentry/bpf_modify_return_test")
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int BPF_PROG(test1)
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{
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return 0;
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}
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__u64 test2_result = 0;
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SEC("kprobe.multi/bpf_fentry_test?")
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int test2(struct pt_regs *ctx)
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{
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__u64 addr = bpf_get_func_ip(ctx);
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test2_result += (const void *) addr == &bpf_fentry_test1 ||
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(const void *) addr == &bpf_fentry_test2 ||
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(const void *) addr == &bpf_fentry_test3 ||
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(const void *) addr == &bpf_fentry_test4 ||
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(const void *) addr == &bpf_fentry_test5 ||
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(const void *) addr == &bpf_fentry_test6 ||
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(const void *) addr == &bpf_fentry_test7 ||
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(const void *) addr == &bpf_fentry_test8;
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return 0;
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}
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__u64 test3_result = 0;
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SEC("kretprobe.multi/bpf_fentry_test*")
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int test3(struct pt_regs *ctx)
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{
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__u64 addr = bpf_get_func_ip(ctx);
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test3_result += (const void *) addr == &bpf_fentry_test1 ||
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(const void *) addr == &bpf_fentry_test2 ||
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(const void *) addr == &bpf_fentry_test3 ||
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(const void *) addr == &bpf_fentry_test4 ||
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(const void *) addr == &bpf_fentry_test5 ||
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(const void *) addr == &bpf_fentry_test6 ||
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(const void *) addr == &bpf_fentry_test7 ||
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(const void *) addr == &bpf_fentry_test8;
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return 0;
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}

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