src/test/test-sigbus.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <fcntl.h>
   4 #include <sys/mman.h>
   5 #include <unistd.h>
   6
   7 #if HAVE_VALGRIND_VALGRIND_H
   8 #  include <valgrind/valgrind.h>
   9 #endif
  10
  11 #include "fd-util.h"
  12 #include "fs-util.h"
  13 #include "memory-util.h"
  14 #include "sigbus.h"
  15 #include "tests.h"
  16
  17 int main(int argc, char *argv[]) {
  18         _cleanup_close_ int fd = -EBADF;
  19         char template[] = "/tmp/sigbus-test-XXXXXX";
  20         void *addr = NULL;
  21         uint8_t *p;
  22
  23         test_setup_logging(LOG_INFO);
  24
  25 #if HAS_FEATURE_ADDRESS_SANITIZER
  26         return log_tests_skipped("address-sanitizer is enabled");
  27 #endif
  28 #if HAVE_VALGRIND_VALGRIND_H
  29         if (RUNNING_ON_VALGRIND)
  30                 return log_tests_skipped("This test cannot run on valgrind");
  31 #endif
  32
  33         sigbus_install();
  34
  35         assert_se(sigbus_pop(&addr) == 0);
  36
  37         assert_se((fd = mkostemp(template, O_RDWR|O_CREAT|O_EXCL)) >= 0);
  38         assert_se(unlink(template) >= 0);
  39         assert_se(posix_fallocate_loop(fd, 0, page_size() * 8) >= 0);
  40
  41         p = mmap(NULL, page_size() * 16, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
  42         assert_se(p != MAP_FAILED);
  43
  44         assert_se(sigbus_pop(&addr) == 0);
  45
  46         p[0] = 0xFF;
  47         assert_se(sigbus_pop(&addr) == 0);
  48
  49         p[page_size()] = 0xFF;
  50         assert_se(sigbus_pop(&addr) == 0);
  51
  52         p[page_size()*8] = 0xFF;
  53         p[page_size()*8+1] = 0xFF;
  54         p[page_size()*10] = 0xFF;
  55         assert_se(sigbus_pop(&addr) > 0);
  56         assert_se(addr == p + page_size() * 8);
  57         assert_se(sigbus_pop(&addr) > 0);
  58         assert_se(addr == p + page_size() * 10);
  59         assert_se(sigbus_pop(&addr) == 0);
  60
  61         sigbus_reset();
  62 }