tests/jumbo_va_spaces_28530648.c

   1 #include <stdio.h>
   2 #include <errno.h>
   3 #include <string.h>
   4 #include <unistd.h>
   5 #include <sys/mman.h>
   6
   7 #include <darwintest.h>
   8 #include <darwintest_utils.h>
   9
  10 T_GLOBAL_META(T_META_RUN_CONCURRENTLY(true));
  11
  12 #define GB (1ULL * 1024 * 1024 * 1024)
  13
  14 /*
  15  * This test expects the entitlement to be the enabling factor for a process to
  16  * allocate at least this many GB of VA space. i.e. with the entitlement, n GB
  17  * must be allocatable; whereas without it, it must be less.
  18  * This value was determined experimentally to fit on applicable devices and to
  19  * be clearly distinguishable from the default VA limit.
  20  */
  21 #define ALLOC_TEST_GB 53
  22
  23 T_DECL(TESTNAME,
  24         "Verify that a required entitlement is present in order to be granted an extra-large "
  25         "VA space on arm64",
  26         T_META_NAMESPACE("xnu.vm"),
  27         T_META_CHECK_LEAKS(false))
  28 {
  29         int     i;
  30         void    *res;
  31
  32         if (!dt_64_bit_kernel()) {
  33                 T_SKIP("This test is only applicable to arm64");
  34         }
  35
  36         T_LOG("Attemping to allocate VA space in 1 GB chunks.");
  37
  38         for (i = 0; i < (ALLOC_TEST_GB * 2); i++) {
  39                 res = mmap(NULL, 1 * GB, PROT_NONE, MAP_PRIVATE | MAP_ANON, 0, 0);
  40                 if (res == MAP_FAILED) {
  41                         if (errno != ENOMEM) {
  42                                 T_WITH_ERRNO;
  43                                 T_LOG("mmap failed: stopped at %d of %d GB allocated", i, ALLOC_TEST_GB);
  44                         }
  45                         break;
  46                 } else {
  47                         T_LOG("%d: %p\n", i, res);
  48                 }
  49         }
  50
  51 #if defined(ENTITLED)
  52         T_EXPECT_GE_INT(i, ALLOC_TEST_GB, "Allocate at least %d GB of VA space", ALLOC_TEST_GB);
  53 #else
  54         T_EXPECT_LT_INT(i, ALLOC_TEST_GB, "Not permitted to allocate %d GB of VA space", ALLOC_TEST_GB);
  55 #endif
  56 }