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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signal_tm.c (2229B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Copyright 2016, Cyril Bur, IBM Corp.
      4 *
      5 * Sending one self a signal should always get delivered.
      6 */
      7
      8#include <errno.h>
      9#include <stdlib.h>
     10#include <stdio.h>
     11#include <string.h>
     12#include <signal.h>
     13#include <unistd.h>
     14
     15#include <altivec.h>
     16
     17#include "utils.h"
     18#include "../tm/tm.h"
     19
     20#define MAX_ATTEMPT 500000
     21#define TIMEOUT 10
     22
     23extern long tm_signal_self(pid_t pid, int sig, long *ret);
     24
     25static sig_atomic_t signaled;
     26static sig_atomic_t fail;
     27
     28static void signal_handler(int sig)
     29{
     30	if (tcheck_active()) {
     31		fail = 2;
     32		return;
     33	}
     34
     35	if (sig == SIGUSR1)
     36		signaled = 1;
     37	else
     38		fail = 1;
     39}
     40
     41static int test_signal_tm()
     42{
     43	int i;
     44	struct sigaction act;
     45
     46	act.sa_handler = signal_handler;
     47	act.sa_flags = 0;
     48	sigemptyset(&act.sa_mask);
     49	if (sigaction(SIGUSR1, &act, NULL) < 0) {
     50		perror("sigaction SIGUSR1");
     51		exit(1);
     52	}
     53	if (sigaction(SIGALRM, &act, NULL) < 0) {
     54		perror("sigaction SIGALRM");
     55		exit(1);
     56	}
     57
     58	SKIP_IF(!have_htm());
     59	SKIP_IF(htm_is_synthetic());
     60
     61	for (i = 0; i < MAX_ATTEMPT; i++) {
     62		/*
     63		 * If anything bad happens in ASM and we fail to set ret
     64		 * because *handwave* TM this will cause failure
     65		 */
     66		long ret = 0xdead;
     67		long rc = 0xbeef;
     68
     69		alarm(0); /* Disable any pending */
     70		signaled = 0;
     71		alarm(TIMEOUT);
     72		FAIL_IF(tcheck_transactional());
     73		rc = tm_signal_self(getpid(), SIGUSR1, &ret);
     74		if (ret == 0xdead)
     75			/*
     76			 * This basically means the transaction aborted before we
     77			 * even got to the suspend... this is crazy but it
     78			 * happens.
     79			 * Yes this also means we might never make forward
     80			 * progress... the alarm() will trip eventually...
     81			 */
     82			continue;
     83
     84		if (rc || ret) {
     85			/* Ret is actually an errno */
     86			printf("TEXASR 0x%016lx, TFIAR 0x%016lx\n",
     87					__builtin_get_texasr(), __builtin_get_tfiar());
     88			fprintf(stderr, "(%d) Fail reason: %d rc=0x%lx ret=0x%lx\n",
     89					i, fail, rc, ret);
     90			FAIL_IF(ret);
     91		}
     92		while(!signaled && !fail)
     93			asm volatile("": : :"memory");
     94		if (!signaled) {
     95			fprintf(stderr, "(%d) Fail reason: %d rc=0x%lx ret=0x%lx\n",
     96					i, fail, rc, ret);
     97			FAIL_IF(fail); /* For the line number */
     98		}
     99	}
    100
    101	return 0;
    102}
    103
    104int main(void)
    105{
    106	return test_harness(test_signal_tm, "signal_tm");
    107}