src/test/test-sigbus.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2014 Lennart Poettering
   6 ***/
   7
   8 #include <sys/mman.h>
   9
  10 #include "fd-util.h"
  11 #include "sigbus.h"
  12 #include "util.h"
  13 #if HAVE_VALGRIND_VALGRIND_H
  14 #include <valgrind/valgrind.h>
  15 #endif
  16
  17 int main(int argc, char *argv[]) {
  18         _cleanup_close_ int fd = -1;
  19         char template[] = "/tmp/sigbus-test-XXXXXX";
  20         void *addr = NULL;
  21         uint8_t *p;
  22
  23 #if HAVE_VALGRIND_VALGRIND_H
  24         if (RUNNING_ON_VALGRIND)
  25                 return EXIT_TEST_SKIP;
  26 #endif
  27
  28 #ifdef __SANITIZE_ADDRESS__
  29         return EXIT_TEST_SKIP;
  30 #endif
  31         sigbus_install();
  32
  33         assert_se(sigbus_pop(&addr) == 0);
  34
  35         assert_se((fd = mkostemp(template, O_RDWR|O_CREAT|O_EXCL)) >= 0);
  36         assert_se(unlink(template) >= 0);
  37         assert_se(posix_fallocate(fd, 0, page_size() * 8) >= 0);
  38
  39         p = mmap(NULL, page_size() * 16, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
  40         assert_se(p != MAP_FAILED);
  41
  42         assert_se(sigbus_pop(&addr) == 0);
  43
  44         p[0] = 0xFF;
  45         assert_se(sigbus_pop(&addr) == 0);
  46
  47         p[page_size()] = 0xFF;
  48         assert_se(sigbus_pop(&addr) == 0);
  49
  50         p[page_size()*8] = 0xFF;
  51         p[page_size()*8+1] = 0xFF;
  52         p[page_size()*10] = 0xFF;
  53         assert_se(sigbus_pop(&addr) > 0);
  54         assert_se(addr == p + page_size() * 8);
  55         assert_se(sigbus_pop(&addr) > 0);
  56         assert_se(addr == p + page_size() * 10);
  57         assert_se(sigbus_pop(&addr) == 0);
  58
  59         sigbus_reset();
  60 }