diff options
Diffstat (limited to '')
| -rw-r--r-- | tools/testing/selftests/bpf/prog_tests/bpf_cookie.c | 526 |
1 files changed, 526 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c b/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c new file mode 100644 index 000000000000..2be2d61954bc --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c @@ -0,0 +1,526 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2021 Facebook */ +#define _GNU_SOURCE +#include <pthread.h> +#include <sched.h> +#include <sys/syscall.h> +#include <sys/mman.h> +#include <unistd.h> +#include <test_progs.h> +#include <network_helpers.h> +#include <bpf/btf.h> +#include "test_bpf_cookie.skel.h" +#include "kprobe_multi.skel.h" + +/* uprobe attach point */ +static noinline void trigger_func(void) +{ + asm volatile (""); +} + +static void kprobe_subtest(struct test_bpf_cookie *skel) +{ + DECLARE_LIBBPF_OPTS(bpf_kprobe_opts, opts); + struct bpf_link *link1 = NULL, *link2 = NULL; + struct bpf_link *retlink1 = NULL, *retlink2 = NULL; + + /* attach two kprobes */ + opts.bpf_cookie = 0x1; + opts.retprobe = false; + link1 = bpf_program__attach_kprobe_opts(skel->progs.handle_kprobe, + SYS_NANOSLEEP_KPROBE_NAME, &opts); + if (!ASSERT_OK_PTR(link1, "link1")) + goto cleanup; + + opts.bpf_cookie = 0x2; + opts.retprobe = false; + link2 = bpf_program__attach_kprobe_opts(skel->progs.handle_kprobe, + SYS_NANOSLEEP_KPROBE_NAME, &opts); + if (!ASSERT_OK_PTR(link2, "link2")) + goto cleanup; + + /* attach two kretprobes */ + opts.bpf_cookie = 0x10; + opts.retprobe = true; + retlink1 = bpf_program__attach_kprobe_opts(skel->progs.handle_kretprobe, + SYS_NANOSLEEP_KPROBE_NAME, &opts); + if (!ASSERT_OK_PTR(retlink1, "retlink1")) + goto cleanup; + + opts.bpf_cookie = 0x20; + opts.retprobe = true; + retlink2 = bpf_program__attach_kprobe_opts(skel->progs.handle_kretprobe, + SYS_NANOSLEEP_KPROBE_NAME, &opts); + if (!ASSERT_OK_PTR(retlink2, "retlink2")) + goto cleanup; + + /* trigger kprobe && kretprobe */ + usleep(1); + + ASSERT_EQ(skel->bss->kprobe_res, 0x1 | 0x2, "kprobe_res"); + ASSERT_EQ(skel->bss->kretprobe_res, 0x10 | 0x20, "kretprobe_res"); + +cleanup: + bpf_link__destroy(link1); + bpf_link__destroy(link2); + bpf_link__destroy(retlink1); + bpf_link__destroy(retlink2); +} + +static void kprobe_multi_test_run(struct kprobe_multi *skel) +{ + 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"); + + 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 kprobe_multi_link_api_subtest(void) +{ + int prog_fd, link1_fd = -1, link2_fd = -1; + struct kprobe_multi *skel = NULL; + LIBBPF_OPTS(bpf_link_create_opts, opts); + unsigned long long addrs[8]; + __u64 cookies[8]; + + if (!ASSERT_OK(load_kallsyms(), "load_kallsyms")) + goto cleanup; + + skel = kprobe_multi__open_and_load(); + if (!ASSERT_OK_PTR(skel, "fentry_raw_skel_load")) + goto cleanup; + + skel->bss->pid = getpid(); + skel->bss->test_cookie = true; + +#define GET_ADDR(__sym, __addr) ({ \ + __addr = ksym_get_addr(__sym); \ + if (!ASSERT_NEQ(__addr, 0, "ksym_get_addr " #__sym)) \ + goto cleanup; \ +}) + + GET_ADDR("bpf_fentry_test1", addrs[0]); + GET_ADDR("bpf_fentry_test3", addrs[1]); + GET_ADDR("bpf_fentry_test4", addrs[2]); + GET_ADDR("bpf_fentry_test5", addrs[3]); + GET_ADDR("bpf_fentry_test6", addrs[4]); + GET_ADDR("bpf_fentry_test7", addrs[5]); + GET_ADDR("bpf_fentry_test2", addrs[6]); + GET_ADDR("bpf_fentry_test8", addrs[7]); + +#undef GET_ADDR + + cookies[0] = 1; /* bpf_fentry_test1 */ + cookies[1] = 2; /* bpf_fentry_test3 */ + cookies[2] = 3; /* bpf_fentry_test4 */ + cookies[3] = 4; /* bpf_fentry_test5 */ + cookies[4] = 5; /* bpf_fentry_test6 */ + cookies[5] = 6; /* bpf_fentry_test7 */ + cookies[6] = 7; /* bpf_fentry_test2 */ + cookies[7] = 8; /* bpf_fentry_test8 */ + + opts.kprobe_multi.addrs = (const unsigned long *) &addrs; + opts.kprobe_multi.cnt = ARRAY_SIZE(addrs); + opts.kprobe_multi.cookies = (const __u64 *) &cookies; + 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, "link1_fd")) + goto cleanup; + + cookies[0] = 8; /* bpf_fentry_test1 */ + cookies[1] = 7; /* bpf_fentry_test3 */ + cookies[2] = 6; /* bpf_fentry_test4 */ + cookies[3] = 5; /* bpf_fentry_test5 */ + cookies[4] = 4; /* bpf_fentry_test6 */ + cookies[5] = 3; /* bpf_fentry_test7 */ + cookies[6] = 2; /* bpf_fentry_test2 */ + cookies[7] = 1; /* bpf_fentry_test8 */ + + 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, "link2_fd")) + goto cleanup; + + kprobe_multi_test_run(skel); + +cleanup: + close(link1_fd); + close(link2_fd); + kprobe_multi__destroy(skel); +} + +static void kprobe_multi_attach_api_subtest(void) +{ + struct bpf_link *link1 = NULL, *link2 = NULL; + LIBBPF_OPTS(bpf_kprobe_multi_opts, opts); + LIBBPF_OPTS(bpf_test_run_opts, topts); + struct kprobe_multi *skel = NULL; + const char *syms[8] = { + "bpf_fentry_test1", + "bpf_fentry_test3", + "bpf_fentry_test4", + "bpf_fentry_test5", + "bpf_fentry_test6", + "bpf_fentry_test7", + "bpf_fentry_test2", + "bpf_fentry_test8", + }; + __u64 cookies[8]; + + skel = kprobe_multi__open_and_load(); + if (!ASSERT_OK_PTR(skel, "fentry_raw_skel_load")) + goto cleanup; + + skel->bss->pid = getpid(); + skel->bss->test_cookie = true; + + cookies[0] = 1; /* bpf_fentry_test1 */ + cookies[1] = 2; /* bpf_fentry_test3 */ + cookies[2] = 3; /* bpf_fentry_test4 */ + cookies[3] = 4; /* bpf_fentry_test5 */ + cookies[4] = 5; /* bpf_fentry_test6 */ + cookies[5] = 6; /* bpf_fentry_test7 */ + cookies[6] = 7; /* bpf_fentry_test2 */ + cookies[7] = 8; /* bpf_fentry_test8 */ + + opts.syms = syms; + opts.cnt = ARRAY_SIZE(syms); + opts.cookies = cookies; + + link1 = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kprobe, + NULL, &opts); + if (!ASSERT_OK_PTR(link1, "bpf_program__attach_kprobe_multi_opts")) + goto cleanup; + + cookies[0] = 8; /* bpf_fentry_test1 */ + cookies[1] = 7; /* bpf_fentry_test3 */ + cookies[2] = 6; /* bpf_fentry_test4 */ + cookies[3] = 5; /* bpf_fentry_test5 */ + cookies[4] = 4; /* bpf_fentry_test6 */ + cookies[5] = 3; /* bpf_fentry_test7 */ + cookies[6] = 2; /* bpf_fentry_test2 */ + cookies[7] = 1; /* bpf_fentry_test8 */ + + opts.retprobe = true; + + link2 = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kretprobe, + NULL, &opts); + if (!ASSERT_OK_PTR(link2, "bpf_program__attach_kprobe_multi_opts")) + goto cleanup; + + kprobe_multi_test_run(skel); + +cleanup: + bpf_link__destroy(link2); + bpf_link__destroy(link1); + kprobe_multi__destroy(skel); +} +static void uprobe_subtest(struct test_bpf_cookie *skel) +{ + DECLARE_LIBBPF_OPTS(bpf_uprobe_opts, opts); + struct bpf_link *link1 = NULL, *link2 = NULL; + struct bpf_link *retlink1 = NULL, *retlink2 = NULL; + ssize_t uprobe_offset; + + uprobe_offset = get_uprobe_offset(&trigger_func); + if (!ASSERT_GE(uprobe_offset, 0, "uprobe_offset")) + goto cleanup; + + /* attach two uprobes */ + opts.bpf_cookie = 0x100; + opts.retprobe = false; + link1 = bpf_program__attach_uprobe_opts(skel->progs.handle_uprobe, 0 /* self pid */, + "/proc/self/exe", uprobe_offset, &opts); + if (!ASSERT_OK_PTR(link1, "link1")) + goto cleanup; + + opts.bpf_cookie = 0x200; + opts.retprobe = false; + link2 = bpf_program__attach_uprobe_opts(skel->progs.handle_uprobe, -1 /* any pid */, + "/proc/self/exe", uprobe_offset, &opts); + if (!ASSERT_OK_PTR(link2, "link2")) + goto cleanup; + + /* attach two uretprobes */ + opts.bpf_cookie = 0x1000; + opts.retprobe = true; + retlink1 = bpf_program__attach_uprobe_opts(skel->progs.handle_uretprobe, -1 /* any pid */, + "/proc/self/exe", uprobe_offset, &opts); + if (!ASSERT_OK_PTR(retlink1, "retlink1")) + goto cleanup; + + opts.bpf_cookie = 0x2000; + opts.retprobe = true; + retlink2 = bpf_program__attach_uprobe_opts(skel->progs.handle_uretprobe, 0 /* self pid */, + "/proc/self/exe", uprobe_offset, &opts); + if (!ASSERT_OK_PTR(retlink2, "retlink2")) + goto cleanup; + + /* trigger uprobe && uretprobe */ + trigger_func(); + + ASSERT_EQ(skel->bss->uprobe_res, 0x100 | 0x200, "uprobe_res"); + ASSERT_EQ(skel->bss->uretprobe_res, 0x1000 | 0x2000, "uretprobe_res"); + +cleanup: + bpf_link__destroy(link1); + bpf_link__destroy(link2); + bpf_link__destroy(retlink1); + bpf_link__destroy(retlink2); +} + +static void tp_subtest(struct test_bpf_cookie *skel) +{ + DECLARE_LIBBPF_OPTS(bpf_tracepoint_opts, opts); + struct bpf_link *link1 = NULL, *link2 = NULL, *link3 = NULL; + + /* attach first tp prog */ + opts.bpf_cookie = 0x10000; + link1 = bpf_program__attach_tracepoint_opts(skel->progs.handle_tp1, + "syscalls", "sys_enter_nanosleep", &opts); + if (!ASSERT_OK_PTR(link1, "link1")) + goto cleanup; + + /* attach second tp prog */ + opts.bpf_cookie = 0x20000; + link2 = bpf_program__attach_tracepoint_opts(skel->progs.handle_tp2, + "syscalls", "sys_enter_nanosleep", &opts); + if (!ASSERT_OK_PTR(link2, "link2")) + goto cleanup; + + /* trigger tracepoints */ + usleep(1); + + ASSERT_EQ(skel->bss->tp_res, 0x10000 | 0x20000, "tp_res1"); + + /* now we detach first prog and will attach third one, which causes + * two internal calls to bpf_prog_array_copy(), shuffling + * bpf_prog_array_items around. We test here that we don't lose track + * of associated bpf_cookies. + */ + bpf_link__destroy(link1); + link1 = NULL; + kern_sync_rcu(); + skel->bss->tp_res = 0; + + /* attach third tp prog */ + opts.bpf_cookie = 0x40000; + link3 = bpf_program__attach_tracepoint_opts(skel->progs.handle_tp3, + "syscalls", "sys_enter_nanosleep", &opts); + if (!ASSERT_OK_PTR(link3, "link3")) + goto cleanup; + + /* trigger tracepoints */ + usleep(1); + + ASSERT_EQ(skel->bss->tp_res, 0x20000 | 0x40000, "tp_res2"); + +cleanup: + bpf_link__destroy(link1); + bpf_link__destroy(link2); + bpf_link__destroy(link3); +} + +static void burn_cpu(void) +{ + volatile int j = 0; + cpu_set_t cpu_set; + int i, err; + + /* generate some branches on cpu 0 */ + CPU_ZERO(&cpu_set); + CPU_SET(0, &cpu_set); + err = pthread_setaffinity_np(pthread_self(), sizeof(cpu_set), &cpu_set); + ASSERT_OK(err, "set_thread_affinity"); + + /* spin the loop for a while (random high number) */ + for (i = 0; i < 1000000; ++i) + ++j; +} + +static void pe_subtest(struct test_bpf_cookie *skel) +{ + DECLARE_LIBBPF_OPTS(bpf_perf_event_opts, opts); + struct bpf_link *link = NULL; + struct perf_event_attr attr; + int pfd = -1; + + /* create perf event */ + memset(&attr, 0, sizeof(attr)); + attr.size = sizeof(attr); + attr.type = PERF_TYPE_SOFTWARE; + attr.config = PERF_COUNT_SW_CPU_CLOCK; + attr.freq = 1; + attr.sample_freq = 1000; + pfd = syscall(__NR_perf_event_open, &attr, -1, 0, -1, PERF_FLAG_FD_CLOEXEC); + if (!ASSERT_GE(pfd, 0, "perf_fd")) + goto cleanup; + + opts.bpf_cookie = 0x100000; + link = bpf_program__attach_perf_event_opts(skel->progs.handle_pe, pfd, &opts); + if (!ASSERT_OK_PTR(link, "link1")) + goto cleanup; + + burn_cpu(); /* trigger BPF prog */ + + ASSERT_EQ(skel->bss->pe_res, 0x100000, "pe_res1"); + + /* prevent bpf_link__destroy() closing pfd itself */ + bpf_link__disconnect(link); + /* close BPF link's FD explicitly */ + close(bpf_link__fd(link)); + /* free up memory used by struct bpf_link */ + bpf_link__destroy(link); + link = NULL; + kern_sync_rcu(); + skel->bss->pe_res = 0; + + opts.bpf_cookie = 0x200000; + link = bpf_program__attach_perf_event_opts(skel->progs.handle_pe, pfd, &opts); + if (!ASSERT_OK_PTR(link, "link2")) + goto cleanup; + + burn_cpu(); /* trigger BPF prog */ + + ASSERT_EQ(skel->bss->pe_res, 0x200000, "pe_res2"); + +cleanup: + close(pfd); + bpf_link__destroy(link); +} + +static void tracing_subtest(struct test_bpf_cookie *skel) +{ + __u64 cookie; + int prog_fd; + int fentry_fd = -1, fexit_fd = -1, fmod_ret_fd = -1; + LIBBPF_OPTS(bpf_test_run_opts, opts); + LIBBPF_OPTS(bpf_link_create_opts, link_opts); + + skel->bss->fentry_res = 0; + skel->bss->fexit_res = 0; + + cookie = 0x10000000000000L; + prog_fd = bpf_program__fd(skel->progs.fentry_test1); + link_opts.tracing.cookie = cookie; + fentry_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_FENTRY, &link_opts); + if (!ASSERT_GE(fentry_fd, 0, "fentry.link_create")) + goto cleanup; + + cookie = 0x20000000000000L; + prog_fd = bpf_program__fd(skel->progs.fexit_test1); + link_opts.tracing.cookie = cookie; + fexit_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_FEXIT, &link_opts); + if (!ASSERT_GE(fexit_fd, 0, "fexit.link_create")) + goto cleanup; + + cookie = 0x30000000000000L; + prog_fd = bpf_program__fd(skel->progs.fmod_ret_test); + link_opts.tracing.cookie = cookie; + fmod_ret_fd = bpf_link_create(prog_fd, 0, BPF_MODIFY_RETURN, &link_opts); + if (!ASSERT_GE(fmod_ret_fd, 0, "fmod_ret.link_create")) + goto cleanup; + + prog_fd = bpf_program__fd(skel->progs.fentry_test1); + bpf_prog_test_run_opts(prog_fd, &opts); + + prog_fd = bpf_program__fd(skel->progs.fmod_ret_test); + bpf_prog_test_run_opts(prog_fd, &opts); + + ASSERT_EQ(skel->bss->fentry_res, 0x10000000000000L, "fentry_res"); + ASSERT_EQ(skel->bss->fexit_res, 0x20000000000000L, "fexit_res"); + ASSERT_EQ(skel->bss->fmod_ret_res, 0x30000000000000L, "fmod_ret_res"); + +cleanup: + if (fentry_fd >= 0) + close(fentry_fd); + if (fexit_fd >= 0) + close(fexit_fd); + if (fmod_ret_fd >= 0) + close(fmod_ret_fd); +} + +int stack_mprotect(void); + +static void lsm_subtest(struct test_bpf_cookie *skel) +{ + __u64 cookie; + int prog_fd; + int lsm_fd = -1; + LIBBPF_OPTS(bpf_link_create_opts, link_opts); + + skel->bss->lsm_res = 0; + + cookie = 0x90000000000090L; + prog_fd = bpf_program__fd(skel->progs.test_int_hook); + link_opts.tracing.cookie = cookie; + lsm_fd = bpf_link_create(prog_fd, 0, BPF_LSM_MAC, &link_opts); + if (!ASSERT_GE(lsm_fd, 0, "lsm.link_create")) + goto cleanup; + + stack_mprotect(); + if (!ASSERT_EQ(errno, EPERM, "stack_mprotect")) + goto cleanup; + + usleep(1); + + ASSERT_EQ(skel->bss->lsm_res, 0x90000000000090L, "fentry_res"); + +cleanup: + if (lsm_fd >= 0) + close(lsm_fd); +} + +void test_bpf_cookie(void) +{ + struct test_bpf_cookie *skel; + + skel = test_bpf_cookie__open_and_load(); + if (!ASSERT_OK_PTR(skel, "skel_open")) + return; + + skel->bss->my_tid = syscall(SYS_gettid); + + if (test__start_subtest("kprobe")) + kprobe_subtest(skel); + if (test__start_subtest("multi_kprobe_link_api")) + kprobe_multi_link_api_subtest(); + if (test__start_subtest("multi_kprobe_attach_api")) + kprobe_multi_attach_api_subtest(); + if (test__start_subtest("uprobe")) + uprobe_subtest(skel); + if (test__start_subtest("tracepoint")) + tp_subtest(skel); + if (test__start_subtest("perf_event")) + pe_subtest(skel); + if (test__start_subtest("trampoline")) + tracing_subtest(skel); + if (test__start_subtest("lsm")) + lsm_subtest(skel); + + test_bpf_cookie__destroy(skel); +} |