Zero memory in CRYPTO_secure_malloc.

[openssl.git] / test / secmemtest.c

diff --git a/test/secmemtest.c b/test/secmemtest.c
index c7d4fe701f9900da0fbf84ab6e2c0016fe5a97ce..2795abb546f6b22bbc2aa1e2e802e1f6d5a6db90 100644 (file)
--- a/test/secmemtest.c
+++ b/test/secmemtest.c
@@ -17,25 +17,31 @@ static int test_sec_mem(void)
     int testresult = 0;
     char *p = NULL, *q = NULL, *r = NULL, *s = NULL;
 
+    s = OPENSSL_secure_malloc(20);
+    /* s = non-secure 20 */
+    if (!TEST_ptr(s)
+        || !TEST_false(CRYPTO_secure_allocated(s)))
+        goto end;
     r = OPENSSL_secure_malloc(20);
-    /* r = non-secure 20 */
+    /* r = non-secure 20, s = non-secure 20 */
     if (!TEST_ptr(r)
         || !TEST_true(CRYPTO_secure_malloc_init(4096, 32))
         || !TEST_false(CRYPTO_secure_allocated(r)))
         goto end;
     p = OPENSSL_secure_malloc(20);
     if (!TEST_ptr(p)
-        /* r = non-secure 20, p = secure 20 */
+        /* r = non-secure 20, p = secure 20, s = non-secure 20 */
         || !TEST_true(CRYPTO_secure_allocated(p))
-        /* 20 secure -> 32-byte minimum allocaton unit */
+        /* 20 secure -> 32-byte minimum allocation unit */
         || !TEST_size_t_eq(CRYPTO_secure_used(), 32))
         goto end;
     q = OPENSSL_malloc(20);
     if (!TEST_ptr(q))
         goto end;
-    /* r = non-secure 20, p = secure 20, q = non-secure 20 */
+    /* r = non-secure 20, p = secure 20, q = non-secure 20, s = non-secure 20 */
     if (!TEST_false(CRYPTO_secure_allocated(q)))
         goto end;
+    OPENSSL_secure_clear_free(s, 20);
     s = OPENSSL_secure_malloc(20);
     if (!TEST_ptr(s)
         /* r = non-secure 20, p = secure 20, q = non-secure 20, s = secure 20 */
@@ -43,7 +49,7 @@ static int test_sec_mem(void)
         /* 2 * 20 secure -> 64 bytes allocated */
         || !TEST_size_t_eq(CRYPTO_secure_used(), 64))
         goto end;
-    OPENSSL_secure_free(p);
+    OPENSSL_secure_clear_free(p, 20);
     p = NULL;
     /* 20 secure -> 32 bytes allocated */
     if (!TEST_size_t_eq(CRYPTO_secure_used(), 32))
@@ -123,7 +129,52 @@ static int test_sec_mem(void)
 #endif
 }
 
-void register_tests(void)
+static int test_sec_mem_clear(void)
+{
+#if defined(OPENSSL_SYS_LINUX) || defined(OPENSSL_SYS_UNIX)
+    const int size = 64;
+    unsigned char *p = NULL;
+    int i, res = 0;
+
+    if (!TEST_true(CRYPTO_secure_malloc_init(4096, 32))
+            || !TEST_ptr(p = OPENSSL_secure_malloc(size)))
+        goto err;
+
+    for (i = 0; i < size; i++)
+        if (!TEST_uchar_eq(p[i], 0))
+            goto err;
+
+    for (i = 0; i < size; i++)
+        p[i] = (unsigned char)(i + ' ' + 1);
+
+    OPENSSL_secure_free(p);
+
+    /*
+     * A deliberate use after free here to verify that the memory has been
+     * cleared properly.  Since secure free doesn't return the memory to
+     * libc's memory pool, it technically isn't freed.  However, the header
+     * bytes have to be skipped and these consist of two pointers in the
+     * current implementation.
+     */
+    for (i = sizeof(void *) * 2; i < size; i++)
+        if (!TEST_uchar_eq(p[i], 0))
+            return 0;
+
+    res = 1;
+    p = NULL;
+
+err:
+    OPENSSL_secure_free(p);
+    CRYPTO_secure_malloc_done();
+    return res;
+#else
+    return 1;
+#endif
+}
+
+int setup_tests(void)
 {
     ADD_TEST(test_sec_mem);
+    ADD_TEST(test_sec_mem_clear);
+    return 1;
 }