text: /*
   * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the OpenSSL license (the "License").  You may not use
   * this file except in compliance with the License.  You can obtain a copy
   * in the file LICENSE in the source distribution or at
   * https://www.openssl.org/source/license.html
   */
  
  #include "e_os.h"
  #include "internal/cryptlib.h"
  #include "internal/cryptlib_int.h"
  #include <stdio.h>
  #include <stdlib.h>
  #include <limits.h>
  #include <openssl/crypto.h>
  #ifndef OPENSSL_NO_CRYPTO_MDEBUG_BACKTRACE
  # include <execinfo.h>
  #endif
  
  /*
   * the following pointers may be changed as long as 'allow_customize' is set
   */
  static int allow_customize = 1;
  
  static void *(*malloc_impl)(size_t, const char *, int)
      = CRYPTO_malloc;
  static void *(*realloc_impl)(void *, size_t, const char *, int)
      = CRYPTO_realloc;
  static void (*free_impl)(void *, const char *, int)
      = CRYPTO_free;
  
  #ifndef OPENSSL_NO_CRYPTO_MDEBUG
  # include "internal/tsan_assist.h"
  
  static TSAN_QUALIFIER int malloc_count;
  static TSAN_QUALIFIER int realloc_count;
  static TSAN_QUALIFIER int free_count;
  
  # define INCREMENT(x) tsan_counter(&(x))
  
  static char *md_failstring;
  static long md_count;
  static int md_fail_percent = 0;
  static int md_tracefd = -1;
  static int call_malloc_debug = 1;
  
  static void parseit(void);
  static int shouldfail(void);
  
  # define FAILTEST() if (shouldfail()) return NULL
  
  #else
  static int call_malloc_debug = 0;
  
  # define INCREMENT(x) /* empty */
  # define FAILTEST() /* empty */
  #endif
  
  int CRYPTO_set_mem_functions(
          void *(*m)(size_t, const char *, int),
          void *(*r)(void *, size_t, const char *, int),
          void (*f)(void *, const char *, int))
  {
      if (!allow_customize)
          return 0;
      if (m)
          malloc_impl = m;
      if (r)
          realloc_impl = r;
      if (f)
          free_impl = f;
      return 1;
  }
  
  int CRYPTO_set_mem_debug(int flag)
  {
      if (!allow_customize)
          return 0;
      call_malloc_debug = flag;
      return 1;
  }
  
  void CRYPTO_get_mem_functions(
          void *(**m)(size_t, const char *, int),
          void *(**r)(void *, size_t, const char *, int),
          void (**f)(void *, const char *, int))
  {
      if (m != NULL)
          *m = malloc_impl;
      if (r != NULL)
          *r = realloc_impl;
      if (f != NULL)
          *f = free_impl;
  }
  
  #ifndef OPENSSL_NO_CRYPTO_MDEBUG
  void CRYPTO_get_alloc_counts(int *mcount, int *rcount, int *fcount)
  {
      if (mcount != NULL)
          *mcount = tsan_load(&malloc_count);
      if (rcount != NULL)
          *rcount = tsan_load(&realloc_count);
      if (fcount != NULL)
          *fcount = tsan_load(&free_count);
  }
  
  /*
   * Parse a "malloc failure spec" string.  This likes like a set of fields
   * separated by semicolons.  Each field has a count and an optional failure
   * percentage.  For example:
   *          100@0;100@25;0@0
   *    or    100;100@25;0
   * This means 100 mallocs succeed, then next 100 fail 25% of the time, and
   * all remaining (count is zero) succeed.
   */
  static void parseit(void)
  {
      char *semi = strchr(md_failstring, ';');
      char *atsign;
  
      if (semi != NULL)
          *semi++ = '\0';
  
      /* Get the count (atol will stop at the @ if there), and percentage */
      md_count = atol(md_failstring);
      atsign = strchr(md_failstring, '@');
      md_fail_percent = atsign == NULL ? 0 : atoi(atsign + 1);
  
      if (semi != NULL)
          md_failstring = semi;
  }
  
  /*
   * Windows doesn't have random(), but it has rand()
   * Some rand() implementations aren't good, but we're not
   * dealing with secure randomness here.
   */
  # ifdef _WIN32
  #  define random() rand()
  # endif
  /*
   * See if the current malloc should fail.
   */
  static int shouldfail(void)
  {
      int roll = (int)(random() % 100);
      int shoulditfail = roll < md_fail_percent;
  # ifndef _WIN32
  /* suppressed on Windows as POSIX-like file descriptors are non-inheritable */
      int len;
      char buff[80];
  
      if (md_tracefd > 0) {
          BIO_snprintf(buff, sizeof(buff),
                       "%c C%ld %%%d R%d\n",
                       shoulditfail ? '-' : '+', md_count, md_fail_percent, roll);
          len = strlen(buff);
          if (write(md_tracefd, buff, len) != len)
              perror("shouldfail write failed");
  #  ifndef OPENSSL_NO_CRYPTO_MDEBUG_BACKTRACE
          if (shoulditfail) {
              void *addrs[30];
              int num = backtrace(addrs, OSSL_NELEM(addrs));
  
              backtrace_symbols_fd(addrs, num, md_tracefd);
          }
  #  endif
      }
  # endif
  
      if (md_count) {
          /* If we used up this one, go to the next. */
          if (--md_count == 0)
              parseit();
      }
  
      return shoulditfail;
  }
  
  void ossl_malloc_setup_failures(void)
  {
      const char *cp = getenv("OPENSSL_MALLOC_FAILURES");
  
      if (cp != NULL && (md_failstring = strdup(cp)) != NULL)
          parseit();
      if ((cp = getenv("OPENSSL_MALLOC_FD")) != NULL)
          md_tracefd = atoi(cp);
  }
  #endif
  
  void *CRYPTO_malloc(size_t num, const char *file, int line)
  {
      void *ret = NULL;
  
      INCREMENT(malloc_count);
      if (malloc_impl != NULL && malloc_impl != CRYPTO_malloc)
          return malloc_impl(num, file, line);
  
      if (num == 0)
          return NULL;
  
      FAILTEST();
      if (allow_customize) {
          /*
           * Disallow customization after the first allocation. We only set this
           * if necessary to avoid a store to the same cache line on every
           * allocation.
           */
          allow_customize = 0;
      }
  #ifndef OPENSSL_NO_CRYPTO_MDEBUG
      if (call_malloc_debug) {
          CRYPTO_mem_debug_malloc(NULL, num, 0, file, line);
          ret = malloc(num);
          CRYPTO_mem_debug_malloc(ret, num, 1, file, line);
      } else {
          ret = malloc(num);
      }
  #else
      (void)(file); (void)(line);
      ret = malloc(num);
  #endif
  
      return ret;
  }
  
  void *CRYPTO_zalloc(size_t num, const char *file, int line)
  {
      void *ret = CRYPTO_malloc(num, file, line);
  
      FAILTEST();
      if (ret != NULL)
          memset(ret, 0, num);
      return ret;
  }
  
  void *CRYPTO_realloc(void *str, size_t num, const char *file, int line)
  {
      INCREMENT(realloc_count);
      if (realloc_impl != NULL && realloc_impl != &CRYPTO_realloc)
          return realloc_impl(str, num, file, line);
  
      FAILTEST();
      if (str == NULL)
          return CRYPTO_malloc(num, file, line);
  
      if (num == 0) {
          CRYPTO_free(str, file, line);
          return NULL;
      }
  
  #ifndef OPENSSL_NO_CRYPTO_MDEBUG
      if (call_malloc_debug) {
          void *ret;
          CRYPTO_mem_debug_realloc(str, NULL, num, 0, file, line);
          ret = realloc(str, num);
          CRYPTO_mem_debug_realloc(str, ret, num, 1, file, line);
          return ret;
      }
  #else
      (void)(file); (void)(line);
  #endif
      return realloc(str, num);
  
  }
  
  void *CRYPTO_clear_realloc(void *str, size_t old_len, size_t num,
                             const char *file, int line)
  {
      void *ret = NULL;
  
      if (str == NULL)
          return CRYPTO_malloc(num, file, line);
  
      if (num == 0) {
          CRYPTO_clear_free(str, old_len, file, line);
          return NULL;
      }
  
      /* Can't shrink the buffer since memcpy below copies |old_len| bytes. */
      if (num < old_len) {
          OPENSSL_cleanse((char*)str + num, old_len - num);
          return str;
      }
  
      ret = CRYPTO_malloc(num, file, line);
      if (ret != NULL) {
          memcpy(ret, str, old_len);
          CRYPTO_clear_free(str, old_len, file, line);
      }
      return ret;
  }
  
  void CRYPTO_free(void *str, const char *file, int line)
  {
      INCREMENT(free_count);
      if (free_impl != NULL && free_impl != &CRYPTO_free) {
          free_impl(str, file, line);
          return;
      }
  
  #ifndef OPENSSL_NO_CRYPTO_MDEBUG
      if (call_malloc_debug) {
          CRYPTO_mem_debug_free(str, 0, file, line);
          free(str);
          CRYPTO_mem_debug_free(str, 1, file, line);
      } else {
          free(str);
      }
  #else
      free(str);
  #endif
  }
  
  void CRYPTO_clear_free(void *str, size_t num, const char *file, int line)
  {
      if (str == NULL)
          return;
      if (num)
          OPENSSL_cleanse(str, num);
      CRYPTO_free(str, file, line);
  }
  