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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kcmp_test.c (3620B)

      1// SPDX-License-Identifier: GPL-2.0
      2#define _GNU_SOURCE
      3
      4#include <stdio.h>
      5#include <stdlib.h>
      6#include <signal.h>
      7#include <limits.h>
      8#include <unistd.h>
      9#include <errno.h>
     10#include <string.h>
     11#include <fcntl.h>
     12#include <linux/unistd.h>
     13#include <linux/kcmp.h>
     14
     15#include <sys/syscall.h>
     16#include <sys/types.h>
     17#include <sys/stat.h>
     18#include <sys/wait.h>
     19#include <sys/epoll.h>
     20
     21#include "../kselftest.h"
     22
     23static long sys_kcmp(int pid1, int pid2, int type, unsigned long fd1, unsigned long fd2)
     24{
     25	return syscall(__NR_kcmp, pid1, pid2, type, fd1, fd2);
     26}
     27
     28static const unsigned int duped_num = 64;
     29
     30int main(int argc, char **argv)
     31{
     32	const char kpath[] = "kcmp-test-file";
     33	struct kcmp_epoll_slot epoll_slot;
     34	struct epoll_event ev;
     35	int pid1, pid2;
     36	int pipefd[2];
     37	int fd1, fd2;
     38	int epollfd;
     39	int status;
     40	int fddup;
     41
     42	fd1 = open(kpath, O_RDWR | O_CREAT | O_TRUNC, 0644);
     43	pid1 = getpid();
     44
     45	if (fd1 < 0) {
     46		perror("Can't create file");
     47		ksft_exit_fail();
     48	}
     49
     50	if (pipe(pipefd)) {
     51		perror("Can't create pipe");
     52		ksft_exit_fail();
     53	}
     54
     55	epollfd = epoll_create1(0);
     56	if (epollfd < 0) {
     57		perror("epoll_create1 failed");
     58		ksft_exit_fail();
     59	}
     60
     61	memset(&ev, 0xff, sizeof(ev));
     62	ev.events = EPOLLIN | EPOLLOUT;
     63
     64	if (epoll_ctl(epollfd, EPOLL_CTL_ADD, pipefd[0], &ev)) {
     65		perror("epoll_ctl failed");
     66		ksft_exit_fail();
     67	}
     68
     69	fddup = dup2(pipefd[1], duped_num);
     70	if (fddup < 0) {
     71		perror("dup2 failed");
     72		ksft_exit_fail();
     73	}
     74
     75	if (epoll_ctl(epollfd, EPOLL_CTL_ADD, fddup, &ev)) {
     76		perror("epoll_ctl failed");
     77		ksft_exit_fail();
     78	}
     79	close(fddup);
     80
     81	pid2 = fork();
     82	if (pid2 < 0) {
     83		perror("fork failed");
     84		ksft_exit_fail();
     85	}
     86
     87	if (!pid2) {
     88		int pid2 = getpid();
     89		int ret;
     90
     91		fd2 = open(kpath, O_RDWR, 0644);
     92		if (fd2 < 0) {
     93			perror("Can't open file");
     94			ksft_exit_fail();
     95		}
     96
     97		/* An example of output and arguments */
     98		printf("pid1: %6d pid2: %6d FD: %2ld FILES: %2ld VM: %2ld "
     99		       "FS: %2ld SIGHAND: %2ld IO: %2ld SYSVSEM: %2ld "
    100		       "INV: %2ld\n",
    101		       pid1, pid2,
    102		       sys_kcmp(pid1, pid2, KCMP_FILE,		fd1, fd2),
    103		       sys_kcmp(pid1, pid2, KCMP_FILES,		0, 0),
    104		       sys_kcmp(pid1, pid2, KCMP_VM,		0, 0),
    105		       sys_kcmp(pid1, pid2, KCMP_FS,		0, 0),
    106		       sys_kcmp(pid1, pid2, KCMP_SIGHAND,	0, 0),
    107		       sys_kcmp(pid1, pid2, KCMP_IO,		0, 0),
    108		       sys_kcmp(pid1, pid2, KCMP_SYSVSEM,	0, 0),
    109
    110			/* This one should fail */
    111		       sys_kcmp(pid1, pid2, KCMP_TYPES + 1,	0, 0));
    112
    113		/* This one should return same fd */
    114		ret = sys_kcmp(pid1, pid2, KCMP_FILE, fd1, fd1);
    115		if (ret) {
    116			printf("FAIL: 0 expected but %d returned (%s)\n",
    117				ret, strerror(errno));
    118			ksft_inc_fail_cnt();
    119			ret = -1;
    120		} else {
    121			printf("PASS: 0 returned as expected\n");
    122			ksft_inc_pass_cnt();
    123		}
    124
    125		/* Compare with self */
    126		ret = sys_kcmp(pid1, pid1, KCMP_VM, 0, 0);
    127		if (ret) {
    128			printf("FAIL: 0 expected but %d returned (%s)\n",
    129				ret, strerror(errno));
    130			ksft_inc_fail_cnt();
    131			ret = -1;
    132		} else {
    133			printf("PASS: 0 returned as expected\n");
    134			ksft_inc_pass_cnt();
    135		}
    136
    137		/* Compare epoll target */
    138		epoll_slot = (struct kcmp_epoll_slot) {
    139			.efd	= epollfd,
    140			.tfd	= duped_num,
    141			.toff	= 0,
    142		};
    143		ret = sys_kcmp(pid1, pid1, KCMP_EPOLL_TFD, pipefd[1],
    144			       (unsigned long)(void *)&epoll_slot);
    145		if (ret) {
    146			printf("FAIL: 0 expected but %d returned (%s)\n",
    147				ret, strerror(errno));
    148			ksft_inc_fail_cnt();
    149			ret = -1;
    150		} else {
    151			printf("PASS: 0 returned as expected\n");
    152			ksft_inc_pass_cnt();
    153		}
    154
    155		ksft_print_cnts();
    156
    157		if (ret)
    158			ksft_exit_fail();
    159		else
    160			ksft_exit_pass();
    161	}
    162
    163	waitpid(pid2, &status, P_ALL);
    164
    165	return ksft_exit_pass();
    166}