| /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
| * All rights reserved. |
| * |
| * This package is an SSL implementation written |
| * by Eric Young (eay@cryptsoft.com). |
| * The implementation was written so as to conform with Netscapes SSL. |
| * |
| * This library is free for commercial and non-commercial use as long as |
| * the following conditions are aheared to. The following conditions |
| * apply to all code found in this distribution, be it the RC4, RSA, |
| * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
| * included with this distribution is covered by the same copyright terms |
| * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
| * |
| * Copyright remains Eric Young's, and as such any Copyright notices in |
| * the code are not to be removed. |
| * If this package is used in a product, Eric Young should be given attribution |
| * as the author of the parts of the library used. |
| * This can be in the form of a textual message at program startup or |
| * in documentation (online or textual) provided with the package. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. All advertising materials mentioning features or use of this software |
| * must display the following acknowledgement: |
| * "This product includes cryptographic software written by |
| * Eric Young (eay@cryptsoft.com)" |
| * The word 'cryptographic' can be left out if the rouines from the library |
| * being used are not cryptographic related :-). |
| * 4. If you include any Windows specific code (or a derivative thereof) from |
| * the apps directory (application code) you must include an acknowledgement: |
| * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
| * |
| * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * |
| * The licence and distribution terms for any publically available version or |
| * derivative of this code cannot be changed. i.e. this code cannot simply be |
| * copied and put under another distribution licence |
| * [including the GNU Public Licence.] */ |
| |
| #include <openssl/mem.h> |
| |
| #include <assert.h> |
| #include <stdarg.h> |
| #include <stdio.h> |
| |
| #include <openssl/err.h> |
| |
| #if defined(OPENSSL_WINDOWS) |
| OPENSSL_MSVC_PRAGMA(warning(push, 3)) |
| #include <windows.h> |
| OPENSSL_MSVC_PRAGMA(warning(pop)) |
| #endif |
| |
| #include "internal.h" |
| |
| |
| #define OPENSSL_MALLOC_PREFIX 8 |
| |
| #if defined(OPENSSL_ASAN) |
| void __asan_poison_memory_region(const volatile void *addr, size_t size); |
| void __asan_unpoison_memory_region(const volatile void *addr, size_t size); |
| #else |
| static void __asan_poison_memory_region(const void *addr, size_t size) {} |
| static void __asan_unpoison_memory_region(const void *addr, size_t size) {} |
| #endif |
| |
| // Windows doesn't really support weak symbols as of May 2019, and Clang on |
| // Windows will emit strong symbols instead. See |
| // https://bugs.llvm.org/show_bug.cgi?id=37598 |
| #if defined(__GNUC__) || (defined(__clang__) && !defined(_MSC_VER)) |
| #define WEAK_SYMBOL_DECL |
| #define WEAK_SYMBOL_DEFAULT_IMPL __attribute((weak, noinline)) |
| #else |
| #define WEAK_SYMBOL_DECL static |
| #define WEAK_SYMBOL_DEFAULT_IMPL static |
| #endif |
| |
| // sdallocx is a sized |free| function. By passing the size (which we happen to |
| // always know in BoringSSL), the malloc implementation can save work. We cannot |
| // depend on |sdallocx| being available so we declare a wrapper that falls back |
| // to |free| as a weak symbol. |
| // |
| // This will always be safe, but will only be overridden if the malloc |
| // implementation is statically linked with BoringSSL. So, if |sdallocx| is |
| // provided in, say, libc.so, we still won't use it because that's dynamically |
| // linked. This isn't an ideal result, but its helps in some cases. |
| WEAK_SYMBOL_DECL void sdallocx(void *ptr, size_t size, int flags); |
| WEAK_SYMBOL_DEFAULT_IMPL void sdallocx(void *ptr, size_t size, int flags) { |
| free(ptr); |
| } |
| |
| // The following two functions are for memory tracking. They are no-ops by |
| // default but can be overridden at link time if the application needs to |
| // observe heap operations. |
| WEAK_SYMBOL_DECL void OPENSSL_track_memory_alloc(void *ptr, size_t size); |
| WEAK_SYMBOL_DEFAULT_IMPL void OPENSSL_track_memory_alloc(void *ptr, |
| size_t size) {} |
| |
| WEAK_SYMBOL_DECL void OPENSSL_track_memory_free(void *ptr, size_t size); |
| WEAK_SYMBOL_DEFAULT_IMPL void OPENSSL_track_memory_free(void *ptr, |
| size_t size) {} |
| |
| void *OPENSSL_malloc(size_t size) { |
| if (size + OPENSSL_MALLOC_PREFIX < size) { |
| return NULL; |
| } |
| |
| void *ptr = malloc(size + OPENSSL_MALLOC_PREFIX); |
| if (ptr == NULL) { |
| return NULL; |
| } |
| |
| *(size_t *)ptr = size; |
| |
| __asan_poison_memory_region(ptr, OPENSSL_MALLOC_PREFIX); |
| OPENSSL_track_memory_alloc(ptr, size + OPENSSL_MALLOC_PREFIX); |
| return ((uint8_t *)ptr) + OPENSSL_MALLOC_PREFIX; |
| } |
| |
| void OPENSSL_free(void *orig_ptr) { |
| if (orig_ptr == NULL) { |
| return; |
| } |
| |
| void *ptr = ((uint8_t *)orig_ptr) - OPENSSL_MALLOC_PREFIX; |
| __asan_unpoison_memory_region(ptr, OPENSSL_MALLOC_PREFIX); |
| |
| size_t size = *(size_t *)ptr; |
| OPENSSL_track_memory_free(ptr, size + OPENSSL_MALLOC_PREFIX); |
| OPENSSL_cleanse(ptr, size + OPENSSL_MALLOC_PREFIX); |
| sdallocx(ptr, size + OPENSSL_MALLOC_PREFIX, 0 /* flags */); |
| } |
| |
| void *OPENSSL_realloc(void *orig_ptr, size_t new_size) { |
| if (orig_ptr == NULL) { |
| return OPENSSL_malloc(new_size); |
| } |
| |
| void *ptr = ((uint8_t *)orig_ptr) - OPENSSL_MALLOC_PREFIX; |
| __asan_unpoison_memory_region(ptr, OPENSSL_MALLOC_PREFIX); |
| size_t old_size = *(size_t *)ptr; |
| __asan_poison_memory_region(ptr, OPENSSL_MALLOC_PREFIX); |
| |
| void *ret = OPENSSL_malloc(new_size); |
| if (ret == NULL) { |
| return NULL; |
| } |
| |
| size_t to_copy = new_size; |
| if (old_size < to_copy) { |
| to_copy = old_size; |
| } |
| |
| memcpy(ret, orig_ptr, to_copy); |
| OPENSSL_free(orig_ptr); |
| |
| return ret; |
| } |
| |
| void OPENSSL_cleanse(void *ptr, size_t len) { |
| #if defined(OPENSSL_WINDOWS) |
| SecureZeroMemory(ptr, len); |
| #else |
| OPENSSL_memset(ptr, 0, len); |
| |
| #if !defined(OPENSSL_NO_ASM) |
| /* As best as we can tell, this is sufficient to break any optimisations that |
| might try to eliminate "superfluous" memsets. If there's an easy way to |
| detect memset_s, it would be better to use that. */ |
| __asm__ __volatile__("" : : "r"(ptr) : "memory"); |
| #endif |
| #endif // !OPENSSL_NO_ASM |
| } |
| |
| void OPENSSL_clear_free(void *ptr, size_t unused) { |
| OPENSSL_free(ptr); |
| } |
| |
| int CRYPTO_memcmp(const void *in_a, const void *in_b, size_t len) { |
| const uint8_t *a = in_a; |
| const uint8_t *b = in_b; |
| uint8_t x = 0; |
| |
| for (size_t i = 0; i < len; i++) { |
| x |= a[i] ^ b[i]; |
| } |
| |
| return x; |
| } |
| |
| uint32_t OPENSSL_hash32(const void *ptr, size_t len) { |
| // These are the FNV-1a parameters for 32 bits. |
| static const uint32_t kPrime = 16777619u; |
| static const uint32_t kOffsetBasis = 2166136261u; |
| |
| const uint8_t *in = ptr; |
| uint32_t h = kOffsetBasis; |
| |
| for (size_t i = 0; i < len; i++) { |
| h ^= in[i]; |
| h *= kPrime; |
| } |
| |
| return h; |
| } |
| |
| size_t OPENSSL_strnlen(const char *s, size_t len) { |
| for (size_t i = 0; i < len; i++) { |
| if (s[i] == 0) { |
| return i; |
| } |
| } |
| |
| return len; |
| } |
| |
| char *OPENSSL_strdup(const char *s) { |
| if (s == NULL) { |
| return NULL; |
| } |
| const size_t len = strlen(s) + 1; |
| char *ret = OPENSSL_malloc(len); |
| if (ret == NULL) { |
| return NULL; |
| } |
| OPENSSL_memcpy(ret, s, len); |
| return ret; |
| } |
| |
| int OPENSSL_tolower(int c) { |
| if (c >= 'A' && c <= 'Z') { |
| return c + ('a' - 'A'); |
| } |
| return c; |
| } |
| |
| int OPENSSL_strcasecmp(const char *a, const char *b) { |
| for (size_t i = 0;; i++) { |
| const int aa = OPENSSL_tolower(a[i]); |
| const int bb = OPENSSL_tolower(b[i]); |
| |
| if (aa < bb) { |
| return -1; |
| } else if (aa > bb) { |
| return 1; |
| } else if (aa == 0) { |
| return 0; |
| } |
| } |
| } |
| |
| int OPENSSL_strncasecmp(const char *a, const char *b, size_t n) { |
| for (size_t i = 0; i < n; i++) { |
| const int aa = OPENSSL_tolower(a[i]); |
| const int bb = OPENSSL_tolower(b[i]); |
| |
| if (aa < bb) { |
| return -1; |
| } else if (aa > bb) { |
| return 1; |
| } else if (aa == 0) { |
| return 0; |
| } |
| } |
| |
| return 0; |
| } |
| |
| int BIO_snprintf(char *buf, size_t n, const char *format, ...) { |
| va_list args; |
| va_start(args, format); |
| int ret = BIO_vsnprintf(buf, n, format, args); |
| va_end(args); |
| return ret; |
| } |
| |
| int BIO_vsnprintf(char *buf, size_t n, const char *format, va_list args) { |
| return vsnprintf(buf, n, format, args); |
| } |
| |
| char *OPENSSL_strndup(const char *str, size_t size) { |
| char *ret; |
| size_t alloc_size; |
| |
| if (str == NULL) { |
| return NULL; |
| } |
| |
| size = OPENSSL_strnlen(str, size); |
| |
| alloc_size = size + 1; |
| if (alloc_size < size) { |
| // overflow |
| OPENSSL_PUT_ERROR(CRYPTO, ERR_R_MALLOC_FAILURE); |
| return NULL; |
| } |
| ret = OPENSSL_malloc(alloc_size); |
| if (ret == NULL) { |
| OPENSSL_PUT_ERROR(CRYPTO, ERR_R_MALLOC_FAILURE); |
| return NULL; |
| } |
| |
| OPENSSL_memcpy(ret, str, size); |
| ret[size] = '\0'; |
| return ret; |
| } |
| |
| size_t OPENSSL_strlcpy(char *dst, const char *src, size_t dst_size) { |
| size_t l = 0; |
| |
| for (; dst_size > 1 && *src; dst_size--) { |
| *dst++ = *src++; |
| l++; |
| } |
| |
| if (dst_size) { |
| *dst = 0; |
| } |
| |
| return l + strlen(src); |
| } |
| |
| size_t OPENSSL_strlcat(char *dst, const char *src, size_t dst_size) { |
| size_t l = 0; |
| for (; dst_size > 0 && *dst; dst_size--, dst++) { |
| l++; |
| } |
| return l + OPENSSL_strlcpy(dst, src, dst_size); |
| } |
| |
| void *OPENSSL_memdup(const void *data, size_t size) { |
| if (size == 0) { |
| return NULL; |
| } |
| |
| void *ret = OPENSSL_malloc(size); |
| if (ret == NULL) { |
| OPENSSL_PUT_ERROR(CRYPTO, ERR_R_MALLOC_FAILURE); |
| return NULL; |
| } |
| |
| OPENSSL_memcpy(ret, data, size); |
| return ret; |
| } |