cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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test_overhead.c (3853B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/* Copyright (c) 2019 Facebook */
      3#define _GNU_SOURCE
      4#include <sched.h>
      5#include <sys/prctl.h>
      6#include <test_progs.h>
      7
      8#define MAX_CNT 100000
      9
     10static __u64 time_get_ns(void)
     11{
     12	struct timespec ts;
     13
     14	clock_gettime(CLOCK_MONOTONIC, &ts);
     15	return ts.tv_sec * 1000000000ull + ts.tv_nsec;
     16}
     17
     18static int test_task_rename(const char *prog)
     19{
     20	int i, fd, duration = 0, err;
     21	char buf[] = "test_overhead";
     22	__u64 start_time;
     23
     24	fd = open("/proc/self/comm", O_WRONLY|O_TRUNC);
     25	if (CHECK(fd < 0, "open /proc", "err %d", errno))
     26		return -1;
     27	start_time = time_get_ns();
     28	for (i = 0; i < MAX_CNT; i++) {
     29		err = write(fd, buf, sizeof(buf));
     30		if (err < 0) {
     31			CHECK(err < 0, "task rename", "err %d", errno);
     32			close(fd);
     33			return -1;
     34		}
     35	}
     36	printf("task_rename %s\t%lluK events per sec\n", prog,
     37	       MAX_CNT * 1000000ll / (time_get_ns() - start_time));
     38	close(fd);
     39	return 0;
     40}
     41
     42static void test_run(const char *prog)
     43{
     44	test_task_rename(prog);
     45}
     46
     47static void setaffinity(void)
     48{
     49	cpu_set_t cpuset;
     50	int cpu = 0;
     51
     52	CPU_ZERO(&cpuset);
     53	CPU_SET(cpu, &cpuset);
     54	sched_setaffinity(0, sizeof(cpuset), &cpuset);
     55}
     56
     57void test_test_overhead(void)
     58{
     59	const char *kprobe_name = "prog1";
     60	const char *kretprobe_name = "prog2";
     61	const char *raw_tp_name = "prog3";
     62	const char *fentry_name = "prog4";
     63	const char *fexit_name = "prog5";
     64	const char *kprobe_func = "__set_task_comm";
     65	struct bpf_program *kprobe_prog, *kretprobe_prog, *raw_tp_prog;
     66	struct bpf_program *fentry_prog, *fexit_prog;
     67	struct bpf_object *obj;
     68	struct bpf_link *link;
     69	int err, duration = 0;
     70	char comm[16] = {};
     71
     72	if (CHECK_FAIL(prctl(PR_GET_NAME, comm, 0L, 0L, 0L)))
     73		return;
     74
     75	obj = bpf_object__open_file("./test_overhead.o", NULL);
     76	if (!ASSERT_OK_PTR(obj, "obj_open_file"))
     77		return;
     78
     79	kprobe_prog = bpf_object__find_program_by_name(obj, kprobe_name);
     80	if (CHECK(!kprobe_prog, "find_probe",
     81		  "prog '%s' not found\n", kprobe_name))
     82		goto cleanup;
     83	kretprobe_prog = bpf_object__find_program_by_name(obj, kretprobe_name);
     84	if (CHECK(!kretprobe_prog, "find_probe",
     85		  "prog '%s' not found\n", kretprobe_name))
     86		goto cleanup;
     87	raw_tp_prog = bpf_object__find_program_by_name(obj, raw_tp_name);
     88	if (CHECK(!raw_tp_prog, "find_probe",
     89		  "prog '%s' not found\n", raw_tp_name))
     90		goto cleanup;
     91	fentry_prog = bpf_object__find_program_by_name(obj, fentry_name);
     92	if (CHECK(!fentry_prog, "find_probe",
     93		  "prog '%s' not found\n", fentry_name))
     94		goto cleanup;
     95	fexit_prog = bpf_object__find_program_by_name(obj, fexit_name);
     96	if (CHECK(!fexit_prog, "find_probe",
     97		  "prog '%s' not found\n", fexit_name))
     98		goto cleanup;
     99	err = bpf_object__load(obj);
    100	if (CHECK(err, "obj_load", "err %d\n", err))
    101		goto cleanup;
    102
    103	setaffinity();
    104
    105	/* base line run */
    106	test_run("base");
    107
    108	/* attach kprobe */
    109	link = bpf_program__attach_kprobe(kprobe_prog, false /* retprobe */,
    110					  kprobe_func);
    111	if (!ASSERT_OK_PTR(link, "attach_kprobe"))
    112		goto cleanup;
    113	test_run("kprobe");
    114	bpf_link__destroy(link);
    115
    116	/* attach kretprobe */
    117	link = bpf_program__attach_kprobe(kretprobe_prog, true /* retprobe */,
    118					  kprobe_func);
    119	if (!ASSERT_OK_PTR(link, "attach_kretprobe"))
    120		goto cleanup;
    121	test_run("kretprobe");
    122	bpf_link__destroy(link);
    123
    124	/* attach raw_tp */
    125	link = bpf_program__attach_raw_tracepoint(raw_tp_prog, "task_rename");
    126	if (!ASSERT_OK_PTR(link, "attach_raw_tp"))
    127		goto cleanup;
    128	test_run("raw_tp");
    129	bpf_link__destroy(link);
    130
    131	/* attach fentry */
    132	link = bpf_program__attach_trace(fentry_prog);
    133	if (!ASSERT_OK_PTR(link, "attach_fentry"))
    134		goto cleanup;
    135	test_run("fentry");
    136	bpf_link__destroy(link);
    137
    138	/* attach fexit */
    139	link = bpf_program__attach_trace(fexit_prog);
    140	if (!ASSERT_OK_PTR(link, "attach_fexit"))
    141		goto cleanup;
    142	test_run("fexit");
    143	bpf_link__destroy(link);
    144
    145cleanup:
    146	prctl(PR_SET_NAME, comm, 0L, 0L, 0L);
    147	bpf_object__close(obj);
    148}