cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

timens.h (2326B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef __TIMENS_H__
      3#define __TIMENS_H__
      4
      5#include <fcntl.h>
      6#include <unistd.h>
      7#include <stdlib.h>
      8#include <stdbool.h>
      9
     10#include "../kselftest.h"
     11
     12#ifndef CLONE_NEWTIME
     13# define CLONE_NEWTIME	0x00000080
     14#endif
     15
     16static int config_posix_timers = true;
     17static int config_alarm_timers = true;
     18
     19static inline void check_supported_timers(void)
     20{
     21	struct timespec ts;
     22
     23	if (timer_create(-1, 0, 0) == -1 && errno == ENOSYS)
     24		config_posix_timers = false;
     25
     26	if (clock_gettime(CLOCK_BOOTTIME_ALARM, &ts) == -1 && errno == EINVAL)
     27		config_alarm_timers = false;
     28}
     29
     30static inline bool check_skip(int clockid)
     31{
     32	if (!config_alarm_timers && clockid == CLOCK_BOOTTIME_ALARM) {
     33		ksft_test_result_skip("CLOCK_BOOTTIME_ALARM isn't supported\n");
     34		return true;
     35	}
     36
     37	if (config_posix_timers)
     38		return false;
     39
     40	switch (clockid) {
     41	/* Only these clocks are supported without CONFIG_POSIX_TIMERS. */
     42	case CLOCK_BOOTTIME:
     43	case CLOCK_MONOTONIC:
     44	case CLOCK_REALTIME:
     45		return false;
     46	default:
     47		ksft_test_result_skip("Posix Clocks & timers are not supported\n");
     48		return true;
     49	}
     50
     51	return false;
     52}
     53
     54static inline int unshare_timens(void)
     55{
     56	if (unshare(CLONE_NEWTIME)) {
     57		if (errno == EPERM)
     58			ksft_exit_skip("need to run as root\n");
     59		return pr_perror("Can't unshare() timens");
     60	}
     61	return 0;
     62}
     63
     64static inline int _settime(clockid_t clk_id, time_t offset)
     65{
     66	int fd, len;
     67	char buf[4096];
     68
     69	if (clk_id == CLOCK_MONOTONIC_COARSE || clk_id == CLOCK_MONOTONIC_RAW)
     70		clk_id = CLOCK_MONOTONIC;
     71
     72	len = snprintf(buf, sizeof(buf), "%d %ld 0", clk_id, offset);
     73
     74	fd = open("/proc/self/timens_offsets", O_WRONLY);
     75	if (fd < 0)
     76		return pr_perror("/proc/self/timens_offsets");
     77
     78	if (write(fd, buf, len) != len)
     79		return pr_perror("/proc/self/timens_offsets");
     80
     81	close(fd);
     82
     83	return 0;
     84}
     85
     86static inline int _gettime(clockid_t clk_id, struct timespec *res, bool raw_syscall)
     87{
     88	int err;
     89
     90	if (!raw_syscall) {
     91		if (clock_gettime(clk_id, res)) {
     92			pr_perror("clock_gettime(%d)", (int)clk_id);
     93			return -1;
     94		}
     95		return 0;
     96	}
     97
     98	err = syscall(SYS_clock_gettime, clk_id, res);
     99	if (err)
    100		pr_perror("syscall(SYS_clock_gettime(%d))", (int)clk_id);
    101
    102	return err;
    103}
    104
    105static inline void nscheck(void)
    106{
    107	if (access("/proc/self/ns/time", F_OK) < 0)
    108		ksft_exit_skip("Time namespaces are not supported\n");
    109}
    110
    111#endif