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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 | // SPDX-License-Identifier: GPL-2.0 #include <subcmd/parse-options.h> #include "bench.h" #include <uapi/linux/filter.h> #include <sys/types.h> #include <sys/time.h> #include <linux/unistd.h> #include <sys/syscall.h> #include <sys/ioctl.h> #include <linux/time64.h> #include <uapi/linux/seccomp.h> #include <sys/prctl.h> #include <unistd.h> #include <limits.h> #include <stddef.h> #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <signal.h> #include <sys/wait.h> #include <string.h> #include <errno.h> #include <err.h> #include <inttypes.h> #define LOOPS_DEFAULT 1000000UL static uint64_t loops = LOOPS_DEFAULT; static bool sync_mode; static const struct option options[] = { OPT_U64('l', "loop", &loops, "Specify number of loops"), OPT_BOOLEAN('s', "sync-mode", &sync_mode, "Enable the synchronious mode for seccomp notifications"), OPT_END() }; static const char * const bench_seccomp_usage[] = { "perf bench sched secccomp-notify <options>", NULL }; static int seccomp(unsigned int op, unsigned int flags, void *args) { return syscall(__NR_seccomp, op, flags, args); } static int user_notif_syscall(int nr, unsigned int flags) { struct sock_filter filter[] = { BPF_STMT(BPF_LD|BPF_W|BPF_ABS, offsetof(struct seccomp_data, nr)), BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, nr, 0, 1), BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_USER_NOTIF), BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), }; struct sock_fprog prog = { .len = (unsigned short)ARRAY_SIZE(filter), .filter = filter, }; return seccomp(SECCOMP_SET_MODE_FILTER, flags, &prog); } #define USER_NOTIF_MAGIC INT_MAX static void user_notification_sync_loop(int listener) { struct seccomp_notif_resp resp; struct seccomp_notif req; uint64_t nr; for (nr = 0; nr < loops; nr++) { memset(&req, 0, sizeof(req)); if (ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req)) err(EXIT_FAILURE, "SECCOMP_IOCTL_NOTIF_RECV failed"); if (req.data.nr != __NR_gettid) errx(EXIT_FAILURE, "unexpected syscall: %d", req.data.nr); resp.id = req.id; resp.error = 0; resp.val = USER_NOTIF_MAGIC; resp.flags = 0; if (ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp)) err(EXIT_FAILURE, "SECCOMP_IOCTL_NOTIF_SEND failed"); } } #ifndef SECCOMP_USER_NOTIF_FD_SYNC_WAKE_UP #define SECCOMP_USER_NOTIF_FD_SYNC_WAKE_UP (1UL << 0) #define SECCOMP_IOCTL_NOTIF_SET_FLAGS SECCOMP_IOW(4, __u64) #endif int bench_sched_seccomp_notify(int argc, const char **argv) { struct timeval start, stop, diff; unsigned long long result_usec = 0; int status, listener; pid_t pid; long ret; argc = parse_options(argc, argv, options, bench_seccomp_usage, 0); gettimeofday(&start, NULL); prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); listener = user_notif_syscall(__NR_gettid, SECCOMP_FILTER_FLAG_NEW_LISTENER); if (listener < 0) err(EXIT_FAILURE, "can't create a notification descriptor"); pid = fork(); if (pid < 0) err(EXIT_FAILURE, "fork"); if (pid == 0) { if (prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0)) err(EXIT_FAILURE, "can't set the parent death signal"); while (1) { ret = syscall(__NR_gettid); if (ret == USER_NOTIF_MAGIC) continue; break; } _exit(1); } if (sync_mode) { if (ioctl(listener, SECCOMP_IOCTL_NOTIF_SET_FLAGS, SECCOMP_USER_NOTIF_FD_SYNC_WAKE_UP, 0)) err(EXIT_FAILURE, "can't set SECCOMP_USER_NOTIF_FD_SYNC_WAKE_UP"); } user_notification_sync_loop(listener); kill(pid, SIGKILL); if (waitpid(pid, &status, 0) != pid) err(EXIT_FAILURE, "waitpid(%d) failed", pid); if (!WIFSIGNALED(status) || WTERMSIG(status) != SIGKILL) errx(EXIT_FAILURE, "unexpected exit code: %d", status); gettimeofday(&stop, NULL); timersub(&stop, &start, &diff); switch (bench_format) { case BENCH_FORMAT_DEFAULT: printf("# Executed %" PRIu64 " system calls\n\n", loops); result_usec = diff.tv_sec * USEC_PER_SEC; result_usec += diff.tv_usec; printf(" %14s: %lu.%03lu [sec]\n\n", "Total time", (unsigned long) diff.tv_sec, (unsigned long) (diff.tv_usec / USEC_PER_MSEC)); printf(" %14lf usecs/op\n", (double)result_usec / (double)loops); printf(" %14d ops/sec\n", (int)((double)loops / ((double)result_usec / (double)USEC_PER_SEC))); break; case BENCH_FORMAT_SIMPLE: printf("%lu.%03lu\n", (unsigned long) diff.tv_sec, (unsigned long) (diff.tv_usec / USEC_PER_MSEC)); break; default: /* reaching here is something disaster */ fprintf(stderr, "Unknown format:%d\n", bench_format); exit(1); break; } return 0; } |