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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vmx_syscall.c (1734B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Copyright 2015, Cyril Bur, IBM Corp.
      4 *
      5 * This test attempts to see if the VMX registers change across a syscall (fork).
      6 */
      7
      8#include <altivec.h>
      9#include <stdio.h>
     10#include <unistd.h>
     11#include <sys/syscall.h>
     12#include <sys/time.h>
     13#include <stdlib.h>
     14#include <sys/types.h>
     15#include <sys/wait.h>
     16#include "utils.h"
     17
     18vector int varray[] = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10,11,12},
     19	{13,14,15,16},{17,18,19,20},{21,22,23,24},
     20	{25,26,27,28},{29,30,31,32},{33,34,35,36},
     21	{37,38,39,40},{41,42,43,44},{45,46,47,48}};
     22
     23extern int test_vmx(vector int *varray, pid_t *pid);
     24
     25int vmx_syscall(void)
     26{
     27	pid_t fork_pid;
     28	int i;
     29	int ret;
     30	int child_ret;
     31	for (i = 0; i < 1000; i++) {
     32		/* test_vmx will fork() */
     33		ret = test_vmx(varray, &fork_pid);
     34		if (fork_pid == -1)
     35			return -1;
     36		if (fork_pid == 0)
     37			exit(ret);
     38		waitpid(fork_pid, &child_ret, 0);
     39		if (ret || child_ret)
     40			return 1;
     41	}
     42
     43	return 0;
     44}
     45
     46int test_vmx_syscall(void)
     47{
     48	/*
     49	 * Setup an environment with much context switching
     50	 */
     51	pid_t pid2;
     52	pid_t pid;
     53	int ret;
     54	int child_ret;
     55
     56	// vcmpequd used in vmx_asm.S is v2.07
     57	SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_2_07));
     58
     59	pid = fork();
     60	FAIL_IF(pid == -1);
     61
     62	pid2 = fork();
     63	ret = vmx_syscall();
     64	/* Can't FAIL_IF(pid2 == -1); because we've already forked */
     65	if (pid2 == -1) {
     66		/*
     67		 * Couldn't fork, ensure child_ret is set and is a fail
     68		 */
     69		ret = child_ret = 1;
     70	} else {
     71		if (pid2)
     72			waitpid(pid2, &child_ret, 0);
     73		else
     74			exit(ret);
     75	}
     76
     77	ret |= child_ret;
     78
     79	if (pid)
     80		waitpid(pid, &child_ret, 0);
     81	else
     82		exit(ret);
     83
     84	FAIL_IF(ret || child_ret);
     85	return 0;
     86}
     87
     88int main(int argc, char *argv[])
     89{
     90	return test_harness(test_vmx_syscall, "vmx_syscall");
     91
     92}