test/secmemtest.c

   1 /*
   2  * Copyright 2015-2017 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <openssl/crypto.h>
  11
  12 #include "testutil.h"
  13
  14 static int test_sec_mem(void)
  15 {
  16 #if defined(OPENSSL_SYS_LINUX) || defined(OPENSSL_SYS_UNIX)
  17     int testresult = 0;
  18     char *p = NULL, *q = NULL, *r = NULL, *s = NULL;
  19
  20     s = OPENSSL_secure_malloc(20);
  21     /* s = non-secure 20 */
  22     if (!TEST_ptr(s)
  23         || !TEST_false(CRYPTO_secure_allocated(s)))
  24         goto end;
  25     r = OPENSSL_secure_malloc(20);
  26     /* r = non-secure 20, s = non-secure 20 */
  27     if (!TEST_ptr(r)
  28         || !TEST_true(CRYPTO_secure_malloc_init(4096, 32))
  29         || !TEST_false(CRYPTO_secure_allocated(r)))
  30         goto end;
  31     p = OPENSSL_secure_malloc(20);
  32     if (!TEST_ptr(p)
  33         /* r = non-secure 20, p = secure 20, s = non-secure 20 */
  34         || !TEST_true(CRYPTO_secure_allocated(p))
  35         /* 20 secure -> 32-byte minimum allocation unit */
  36         || !TEST_size_t_eq(CRYPTO_secure_used(), 32))
  37         goto end;
  38     q = OPENSSL_malloc(20);
  39     if (!TEST_ptr(q))
  40         goto end;
  41     /* r = non-secure 20, p = secure 20, q = non-secure 20, s = non-secure 20 */
  42     if (!TEST_false(CRYPTO_secure_allocated(q)))
  43         goto end;
  44     OPENSSL_secure_clear_free(s, 20);
  45     s = OPENSSL_secure_malloc(20);
  46     if (!TEST_ptr(s)
  47         /* r = non-secure 20, p = secure 20, q = non-secure 20, s = secure 20 */
  48         || !TEST_true(CRYPTO_secure_allocated(s))
  49         /* 2 * 20 secure -> 64 bytes allocated */
  50         || !TEST_size_t_eq(CRYPTO_secure_used(), 64))
  51         goto end;
  52     OPENSSL_secure_clear_free(p, 20);
  53     p = NULL;
  54     /* 20 secure -> 32 bytes allocated */
  55     if (!TEST_size_t_eq(CRYPTO_secure_used(), 32))
  56         goto end;
  57     OPENSSL_free(q);
  58     q = NULL;
  59     /* should not complete, as secure memory is still allocated */
  60     if (!TEST_false(CRYPTO_secure_malloc_done())
  61         || !TEST_true(CRYPTO_secure_malloc_initialized()))
  62         goto end;
  63     OPENSSL_secure_free(s);
  64     s = NULL;
  65     /* secure memory should now be 0, so done should complete */
  66     if (!TEST_size_t_eq(CRYPTO_secure_used(), 0)
  67         || !TEST_true(CRYPTO_secure_malloc_done())
  68         || !TEST_false(CRYPTO_secure_malloc_initialized()))
  69         goto end;
  70
  71     TEST_info("Possible infinite loop: allocate more than available");
  72     if (!TEST_true(CRYPTO_secure_malloc_init(32768, 16)))
  73         goto end;
  74     TEST_ptr_null(OPENSSL_secure_malloc((size_t)-1));
  75     TEST_true(CRYPTO_secure_malloc_done());
  76
  77     /*
  78      * If init fails, then initialized should be false, if not, this
  79      * could cause an infinite loop secure_malloc, but we don't test it
  80      */
  81     if (TEST_false(CRYPTO_secure_malloc_init(16, 16)) &&
  82         !TEST_false(CRYPTO_secure_malloc_initialized())) {
  83         TEST_true(CRYPTO_secure_malloc_done());
  84         goto end;
  85     }
  86
  87     /*-
  88      * There was also a possible infinite loop when the number of
  89      * elements was 1<<31, as |int i| was set to that, which is a
  90      * negative number. However, it requires minimum input values:
  91      *
  92      * CRYPTO_secure_malloc_init((size_t)1<<34, (size_t)1<<4);
  93      *
  94      * Which really only works on 64-bit systems, since it took 16 GB
  95      * secure memory arena to trigger the problem. It naturally takes
  96      * corresponding amount of available virtual and physical memory
  97      * for test to be feasible/representative. Since we can't assume
  98      * that every system is equipped with that much memory, the test
  99      * remains disabled. If the reader of this comment really wants
 100      * to make sure that infinite loop is fixed, they can enable the
 101      * code below.
 102      */
 103 # if 0
 104     /*-
 105      * On Linux and BSD this test has a chance to complete in minimal
 106      * time and with minimum side effects, because mlock is likely to
 107      * fail because of RLIMIT_MEMLOCK, which is customarily [much]
 108      * smaller than 16GB. In other words Linux and BSD users can be
 109      * limited by virtual space alone...
 110      */
 111     if (sizeof(size_t) > 4) {
 112         TEST_info("Possible infinite loop: 1<<31 limit");
 113         if (TEST_true(CRYPTO_secure_malloc_init((size_t)1<<34, (size_t)1<<4) != 0))
 114             TEST_true(CRYPTO_secure_malloc_done());
 115     }
 116 # endif
 117
 118     /* this can complete - it was not really secure */
 119     testresult = 1;
 120  end:
 121     OPENSSL_secure_free(p);
 122     OPENSSL_free(q);
 123     OPENSSL_secure_free(r);
 124     OPENSSL_secure_free(s);
 125     return testresult;
 126 #else
 127     /* Should fail. */
 128     return TEST_false(CRYPTO_secure_malloc_init(4096, 32));
 129 #endif
 130 }
 131
 132 int setup_tests(void)
 133 {
 134     ADD_TEST(test_sec_mem);
 135     return 1;
 136 }