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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tm-fork.c (826B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright 2015, Michael Neuling, IBM Corp.
      4 *
      5 * Edited: Rashmica Gupta, Nov 2015
      6 *
      7 * This test does a fork syscall inside a transaction. Basic sniff test
      8 * to see if we can enter the kernel during a transaction.
      9 */
     10
     11#include <errno.h>
     12#include <inttypes.h>
     13#include <pthread.h>
     14#include <stdio.h>
     15#include <stdlib.h>
     16#include <unistd.h>
     17
     18#include "utils.h"
     19#include "tm.h"
     20
     21int test_fork(void)
     22{
     23	SKIP_IF(!have_htm());
     24	SKIP_IF(htm_is_synthetic());
     25
     26	asm __volatile__(
     27		"tbegin.;"
     28		"blt    1f; "
     29		"li     0, 2;"  /* fork syscall */
     30		"sc  ;"
     31		"tend.;"
     32		"1: ;"
     33		: : : "memory", "r0");
     34	/* If we reach here, we've passed.  Otherwise we've probably crashed
     35	 * the kernel */
     36
     37	return 0;
     38}
     39
     40int main(int argc, char *argv[])
     41{
     42	return test_harness(test_fork, "tm_fork");
     43}