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// 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 <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;
}
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