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https://github.com/openssl/openssl.git
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ab307dc645
Reviewed-by: Andy Polyakov <appro@openssl.org> Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/4994)
318 lines
7.7 KiB
C
318 lines
7.7 KiB
C
/*
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* Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include "e_os.h"
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#include "internal/cryptlib.h"
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#include "internal/cryptlib_int.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <openssl/crypto.h>
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#ifndef OPENSSL_NO_CRYPTO_MDEBUG_BACKTRACE
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# include <execinfo.h>
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#endif
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/*
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* the following pointers may be changed as long as 'allow_customize' is set
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*/
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static int allow_customize = 1;
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static void *(*malloc_impl)(size_t, const char *, int)
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= CRYPTO_malloc;
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static void *(*realloc_impl)(void *, size_t, const char *, int)
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= CRYPTO_realloc;
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static void (*free_impl)(void *, const char *, int)
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= CRYPTO_free;
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#ifndef OPENSSL_NO_CRYPTO_MDEBUG
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static int malloc_count;
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static int realloc_count;
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static int free_count;
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static int dummy;
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# define INCREMENT(x) CRYPTO_atomic_add(&x, 1, &dummy, memdbg_lock)
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# define GET(ret, val) CRYPTO_atomic_read(&val, ret, memdbg_lock)
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static char *md_failstring;
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static long md_count;
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static int md_fail_percent = 0;
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static int md_tracefd = -1;
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static int call_malloc_debug = 1;
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static void parseit(void);
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static int shouldfail(void);
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# define FAILTEST() if (shouldfail()) return NULL
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#else
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static int call_malloc_debug = 0;
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# define INCREMENT(x) /* empty */
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# define FAILTEST() /* empty */
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#endif
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int CRYPTO_set_mem_functions(
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void *(*m)(size_t, const char *, int),
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void *(*r)(void *, size_t, const char *, int),
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void (*f)(void *, const char *, int))
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{
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if (!allow_customize)
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return 0;
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if (m)
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malloc_impl = m;
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if (r)
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realloc_impl = r;
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if (f)
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free_impl = f;
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return 1;
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}
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int CRYPTO_set_mem_debug(int flag)
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{
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if (!allow_customize)
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return 0;
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call_malloc_debug = flag;
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return 1;
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}
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void CRYPTO_get_mem_functions(
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void *(**m)(size_t, const char *, int),
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void *(**r)(void *, size_t, const char *, int),
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void (**f)(void *, const char *, int))
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{
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if (m != NULL)
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*m = malloc_impl;
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if (r != NULL)
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*r = realloc_impl;
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if (f != NULL)
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*f = free_impl;
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}
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#ifndef OPENSSL_NO_CRYPTO_MDEBUG
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void CRYPTO_get_alloc_counts(int *mcount, int *rcount, int *fcount)
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{
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if (mcount != NULL)
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GET(mcount, malloc_count);
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if (rcount != NULL)
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GET(rcount, realloc_count);
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if (fcount != NULL)
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GET(fcount, free_count);
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}
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/*
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* Parse a "malloc failure spec" string. This likes like a set of fields
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* separated by semicolons. Each field has a count and an optional failure
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* percentage. For example:
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* 100@0;100@25;0@0
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* or 100;100@25;0
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* This means 100 mallocs succeed, then next 100 fail 25% of the time, and
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* all remaining (count is zero) succeed.
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*/
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static void parseit(void)
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{
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char *semi = strchr(md_failstring, ';');
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char *atsign;
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if (semi != NULL)
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*semi++ = '\0';
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/* Get the count (atol will stop at the @ if there), and percentage */
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md_count = atol(md_failstring);
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atsign = strchr(md_failstring, '@');
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md_fail_percent = atsign == NULL ? 0 : atoi(atsign + 1);
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if (semi != NULL)
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md_failstring = semi;
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}
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/*
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* Windows doesn't have random(), but it has rand()
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* Some rand() implementations aren't good, but we're not
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* dealing with secure randomness here.
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*/
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# ifdef _WIN32
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# define random() rand()
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# endif
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/*
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* See if the current malloc should fail.
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*/
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static int shouldfail(void)
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{
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int roll = (int)(random() % 100);
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int shoulditfail = roll < md_fail_percent;
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# ifndef _WIN32
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/* suppressed on Windows as POSIX-like file descriptors are non-inheritable */
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int len;
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char buff[80];
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if (md_tracefd > 0) {
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BIO_snprintf(buff, sizeof(buff),
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"%c C%ld %%%d R%d\n",
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shoulditfail ? '-' : '+', md_count, md_fail_percent, roll);
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len = strlen(buff);
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if (write(md_tracefd, buff, len) != len)
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perror("shouldfail write failed");
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# ifndef OPENSSL_NO_CRYPTO_MDEBUG_BACKTRACE
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if (shoulditfail) {
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void *addrs[30];
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int num = backtrace(addrs, OSSL_NELEM(addrs));
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backtrace_symbols_fd(addrs, num, md_tracefd);
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}
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# endif
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}
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# endif
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if (md_count) {
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/* If we used up this one, go to the next. */
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if (--md_count == 0)
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parseit();
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}
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return shoulditfail;
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}
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void ossl_malloc_setup_failures(void)
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{
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const char *cp = getenv("OPENSSL_MALLOC_FAILURES");
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if (cp != NULL && (md_failstring = strdup(cp)) != NULL)
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parseit();
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if ((cp = getenv("OPENSSL_MALLOC_FD")) != NULL)
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md_tracefd = atoi(cp);
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}
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#endif
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void *CRYPTO_malloc(size_t num, const char *file, int line)
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{
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void *ret = NULL;
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INCREMENT(malloc_count);
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if (malloc_impl != NULL && malloc_impl != CRYPTO_malloc)
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return malloc_impl(num, file, line);
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if (num == 0)
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return NULL;
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FAILTEST();
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allow_customize = 0;
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#ifndef OPENSSL_NO_CRYPTO_MDEBUG
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if (call_malloc_debug) {
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CRYPTO_mem_debug_malloc(NULL, num, 0, file, line);
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ret = malloc(num);
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CRYPTO_mem_debug_malloc(ret, num, 1, file, line);
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} else {
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ret = malloc(num);
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}
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#else
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(void)(file); (void)(line);
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ret = malloc(num);
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#endif
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return ret;
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}
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void *CRYPTO_zalloc(size_t num, const char *file, int line)
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{
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void *ret = CRYPTO_malloc(num, file, line);
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FAILTEST();
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if (ret != NULL)
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memset(ret, 0, num);
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return ret;
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}
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void *CRYPTO_realloc(void *str, size_t num, const char *file, int line)
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{
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INCREMENT(realloc_count);
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if (realloc_impl != NULL && realloc_impl != &CRYPTO_realloc)
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return realloc_impl(str, num, file, line);
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FAILTEST();
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if (str == NULL)
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return CRYPTO_malloc(num, file, line);
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if (num == 0) {
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CRYPTO_free(str, file, line);
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return NULL;
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}
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allow_customize = 0;
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#ifndef OPENSSL_NO_CRYPTO_MDEBUG
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if (call_malloc_debug) {
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void *ret;
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CRYPTO_mem_debug_realloc(str, NULL, num, 0, file, line);
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ret = realloc(str, num);
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CRYPTO_mem_debug_realloc(str, ret, num, 1, file, line);
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return ret;
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}
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#else
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(void)(file); (void)(line);
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#endif
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return realloc(str, num);
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}
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void *CRYPTO_clear_realloc(void *str, size_t old_len, size_t num,
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const char *file, int line)
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{
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void *ret = NULL;
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if (str == NULL)
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return CRYPTO_malloc(num, file, line);
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if (num == 0) {
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CRYPTO_clear_free(str, old_len, file, line);
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return NULL;
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}
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/* Can't shrink the buffer since memcpy below copies |old_len| bytes. */
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if (num < old_len) {
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OPENSSL_cleanse((char*)str + num, old_len - num);
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return str;
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}
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ret = CRYPTO_malloc(num, file, line);
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if (ret != NULL) {
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memcpy(ret, str, old_len);
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CRYPTO_clear_free(str, old_len, file, line);
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}
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return ret;
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}
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void CRYPTO_free(void *str, const char *file, int line)
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{
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INCREMENT(free_count);
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if (free_impl != NULL && free_impl != &CRYPTO_free) {
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free_impl(str, file, line);
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return;
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}
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#ifndef OPENSSL_NO_CRYPTO_MDEBUG
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if (call_malloc_debug) {
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CRYPTO_mem_debug_free(str, 0, file, line);
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free(str);
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CRYPTO_mem_debug_free(str, 1, file, line);
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} else {
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free(str);
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}
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#else
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free(str);
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#endif
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}
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void CRYPTO_clear_free(void *str, size_t num, const char *file, int line)
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{
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if (str == NULL)
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return;
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if (num)
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OPENSSL_cleanse(str, num);
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CRYPTO_free(str, file, line);
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}
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