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openssl/crypto/mem_dbg.c

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/*
* Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (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 <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "internal/cryptlib.h"
#include "internal/thread_once.h"
#include <openssl/crypto.h>
#include <openssl/buffer.h>
#include "internal/bio.h"
#include <openssl/lhash.h>
#ifndef OPENSSL_NO_CRYPTO_MDEBUG_BACKTRACE
# include <execinfo.h>
#endif
/*
* The state changes to CRYPTO_MEM_CHECK_ON | CRYPTO_MEM_CHECK_ENABLE when
* the application asks for it (usually after library initialisation for
* which no book-keeping is desired). State CRYPTO_MEM_CHECK_ON exists only
* temporarily when the library thinks that certain allocations should not be
* checked (e.g. the data structures used for memory checking). It is not
* suitable as an initial state: the library will unexpectedly enable memory
* checking when it executes one of those sections that want to disable
* checking temporarily. State CRYPTO_MEM_CHECK_ENABLE without ..._ON makes
* no sense whatsoever.
*/
#ifndef OPENSSL_NO_CRYPTO_MDEBUG
static int mh_mode = CRYPTO_MEM_CHECK_OFF;
#endif
#ifndef OPENSSL_NO_CRYPTO_MDEBUG
static unsigned long order = 0; /* number of memory requests */
/*-
* For application-defined information (static C-string `info')
* to be displayed in memory leak list.
* Each thread has its own stack. For applications, there is
* OPENSSL_mem_debug_push("...") to push an entry,
* OPENSSL_mem_debug_pop() to pop an entry,
*/
struct app_mem_info_st {
CRYPTO_THREAD_ID threadid;
const char *file;
int line;
const char *info;
struct app_mem_info_st *next; /* tail of thread's stack */
int references;
};
static CRYPTO_ONCE memdbg_init = CRYPTO_ONCE_STATIC_INIT;
CRYPTO_RWLOCK *memdbg_lock;
static CRYPTO_RWLOCK *long_memdbg_lock;
static CRYPTO_THREAD_LOCAL appinfokey;
/* memory-block description */
struct mem_st {
void *addr;
int num;
const char *file;
int line;
CRYPTO_THREAD_ID threadid;
unsigned long order;
time_t time;
APP_INFO *app_info;
#ifndef OPENSSL_NO_CRYPTO_MDEBUG_BACKTRACE
void *array[30];
size_t array_siz;
#endif
};
/*
* hash-table of memory requests (address as * key); access requires
* long_memdbg_lock lock
*/
static LHASH_OF(MEM) *mh = NULL;
/* num_disable > 0 iff mh_mode == CRYPTO_MEM_CHECK_ON (w/o ..._ENABLE) */
static unsigned int num_disable = 0;
/*
* Valid iff num_disable > 0. long_memdbg_lock is locked exactly in this
* case (by the thread named in disabling_thread).
*/
static CRYPTO_THREAD_ID disabling_threadid;
DEFINE_RUN_ONCE_STATIC(do_memdbg_init)
{
memdbg_lock = CRYPTO_THREAD_lock_new();
long_memdbg_lock = CRYPTO_THREAD_lock_new();
if (memdbg_lock == NULL || long_memdbg_lock == NULL
|| !CRYPTO_THREAD_init_local(&appinfokey, NULL)) {
CRYPTO_THREAD_lock_free(memdbg_lock);
memdbg_lock = NULL;
CRYPTO_THREAD_lock_free(long_memdbg_lock);
long_memdbg_lock = NULL;
return 0;
}
return 1;
}
static void app_info_free(APP_INFO *inf)
{
if (inf == NULL)
return;
if (--(inf->references) <= 0) {
app_info_free(inf->next);
OPENSSL_free(inf);
}
}
#endif
int CRYPTO_mem_ctrl(int mode)
{
#ifdef OPENSSL_NO_CRYPTO_MDEBUG
return mode - mode;
#else
int ret = mh_mode;
if (!RUN_ONCE(&memdbg_init, do_memdbg_init))
return -1;
CRYPTO_THREAD_write_lock(memdbg_lock);
switch (mode) {
default:
break;
case CRYPTO_MEM_CHECK_ON:
mh_mode = CRYPTO_MEM_CHECK_ON | CRYPTO_MEM_CHECK_ENABLE;
num_disable = 0;
break;
case CRYPTO_MEM_CHECK_OFF:
mh_mode = 0;
num_disable = 0;
break;
/* switch off temporarily (for library-internal use): */
case CRYPTO_MEM_CHECK_DISABLE:
if (mh_mode & CRYPTO_MEM_CHECK_ON) {
CRYPTO_THREAD_ID cur = CRYPTO_THREAD_get_current_id();
/* see if we don't have long_memdbg_lock already */
if (!num_disable
|| !CRYPTO_THREAD_compare_id(disabling_threadid, cur)) {
/*
* Long-time lock long_memdbg_lock must not be claimed
* while we're holding memdbg_lock, or we'll deadlock
* if somebody else holds long_memdbg_lock (and cannot
* release it because we block entry to this function). Give
* them a chance, first, and then claim the locks in
* appropriate order (long-time lock first).
*/
CRYPTO_THREAD_unlock(memdbg_lock);
/*
* Note that after we have waited for long_memdbg_lock and
* memdbg_lock, we'll still be in the right "case" and
* "if" branch because MemCheck_start and MemCheck_stop may
* never be used while there are multiple OpenSSL threads.
*/
CRYPTO_THREAD_write_lock(long_memdbg_lock);
CRYPTO_THREAD_write_lock(memdbg_lock);
mh_mode &= ~CRYPTO_MEM_CHECK_ENABLE;
disabling_threadid = cur;
}
num_disable++;
}
break;
case CRYPTO_MEM_CHECK_ENABLE:
if (mh_mode & CRYPTO_MEM_CHECK_ON) {
if (num_disable) { /* always true, or something is going wrong */
num_disable--;
if (num_disable == 0) {
mh_mode |= CRYPTO_MEM_CHECK_ENABLE;
CRYPTO_THREAD_unlock(long_memdbg_lock);
}
}
}
break;
}
CRYPTO_THREAD_unlock(memdbg_lock);
return ret;
#endif
}
#ifndef OPENSSL_NO_CRYPTO_MDEBUG
static int mem_check_on(void)
{
int ret = 0;
CRYPTO_THREAD_ID cur;
if (mh_mode & CRYPTO_MEM_CHECK_ON) {
if (!RUN_ONCE(&memdbg_init, do_memdbg_init))
return 0;
cur = CRYPTO_THREAD_get_current_id();
CRYPTO_THREAD_read_lock(memdbg_lock);
ret = (mh_mode & CRYPTO_MEM_CHECK_ENABLE)
|| !CRYPTO_THREAD_compare_id(disabling_threadid, cur);
CRYPTO_THREAD_unlock(memdbg_lock);
}
return ret;
}
static int mem_cmp(const MEM *a, const MEM *b)
{
#ifdef _WIN64
const char *ap = (const char *)a->addr, *bp = (const char *)b->addr;
if (ap == bp)
return 0;
else if (ap > bp)
return 1;
else
return -1;
#else
return (const char *)a->addr - (const char *)b->addr;
#endif
}
static unsigned long mem_hash(const MEM *a)
{
size_t ret;
ret = (size_t)a->addr;
ret = ret * 17851 + (ret >> 14) * 7 + (ret >> 4) * 251;
return ret;
}
/* returns 1 if there was an info to pop, 0 if the stack was empty. */
static int pop_info(void)
{
APP_INFO *current = NULL;
if (!RUN_ONCE(&memdbg_init, do_memdbg_init))
return 0;
current = (APP_INFO *)CRYPTO_THREAD_get_local(&appinfokey);
if (current != NULL) {
APP_INFO *next = current->next;
if (next != NULL) {
next->references++;
CRYPTO_THREAD_set_local(&appinfokey, next);
} else {
CRYPTO_THREAD_set_local(&appinfokey, NULL);
}
if (--(current->references) <= 0) {
current->next = NULL;
if (next != NULL)
next->references--;
OPENSSL_free(current);
}
return 1;
}
return 0;
}
int CRYPTO_mem_debug_push(const char *info, const char *file, int line)
{
APP_INFO *ami, *amim;
int ret = 0;
if (mem_check_on()) {
CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_DISABLE);
if (!RUN_ONCE(&memdbg_init, do_memdbg_init)
|| (ami = OPENSSL_malloc(sizeof(*ami))) == NULL)
goto err;
ami->threadid = CRYPTO_THREAD_get_current_id();
ami->file = file;
ami->line = line;
ami->info = info;
ami->references = 1;
ami->next = NULL;
amim = (APP_INFO *)CRYPTO_THREAD_get_local(&appinfokey);
CRYPTO_THREAD_set_local(&appinfokey, ami);
if (amim != NULL)
ami->next = amim;
ret = 1;
err:
CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ENABLE);
}
return ret;
}
int CRYPTO_mem_debug_pop(void)
{
int ret = 0;
if (mem_check_on()) {
CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_DISABLE);
ret = pop_info();
CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ENABLE);
}
return ret;
}
static unsigned long break_order_num = 0;
void CRYPTO_mem_debug_malloc(void *addr, size_t num, int before_p,
const char *file, int line)
{
MEM *m, *mm;
APP_INFO *amim;
switch (before_p & 127) {
case 0:
break;
case 1:
if (addr == NULL)
break;
if (mem_check_on()) {
CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_DISABLE);
if (!RUN_ONCE(&memdbg_init, do_memdbg_init)
|| (m = OPENSSL_malloc(sizeof(*m))) == NULL) {
OPENSSL_free(addr);
CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ENABLE);
return;
}
if (mh == NULL) {
if ((mh = lh_MEM_new(mem_hash, mem_cmp)) == NULL) {
OPENSSL_free(addr);
OPENSSL_free(m);
addr = NULL;
goto err;
}
}
m->addr = addr;
m->file = file;
m->line = line;
m->num = num;
m->threadid = CRYPTO_THREAD_get_current_id();
if (order == break_order_num) {
/* BREAK HERE */
m->order = order;
}
m->order = order++;
# ifndef OPENSSL_NO_CRYPTO_MDEBUG_BACKTRACE
m->array_siz = backtrace(m->array, OSSL_NELEM(m->array));
# endif
m->time = time(NULL);
amim = (APP_INFO *)CRYPTO_THREAD_get_local(&appinfokey);
m->app_info = amim;
if (amim != NULL)
amim->references++;
if ((mm = lh_MEM_insert(mh, m)) != NULL) {
/* Not good, but don't sweat it */
if (mm->app_info != NULL) {
mm->app_info->references--;
}
OPENSSL_free(mm);
}
err:
CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ENABLE);
}
break;
}
return;
}
void CRYPTO_mem_debug_free(void *addr, int before_p,
const char *file, int line)
{
MEM m, *mp;
switch (before_p) {
case 0:
if (addr == NULL)
break;
if (mem_check_on() && (mh != NULL)) {
CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_DISABLE);
m.addr = addr;
mp = lh_MEM_delete(mh, &m);
if (mp != NULL) {
app_info_free(mp->app_info);
OPENSSL_free(mp);
}
CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ENABLE);
}
break;
case 1:
break;
}
}
void CRYPTO_mem_debug_realloc(void *addr1, void *addr2, size_t num,
int before_p, const char *file, int line)
{
MEM m, *mp;
switch (before_p) {
case 0:
break;
case 1:
if (addr2 == NULL)
break;
if (addr1 == NULL) {
CRYPTO_mem_debug_malloc(addr2, num, 128 | before_p, file, line);
break;
}
if (mem_check_on()) {
CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_DISABLE);
m.addr = addr1;
mp = lh_MEM_delete(mh, &m);
if (mp != NULL) {
mp->addr = addr2;
mp->num = num;
#ifndef OPENSSL_NO_CRYPTO_MDEBUG_BACKTRACE
mp->array_siz = backtrace(mp->array, OSSL_NELEM(mp->array));
#endif
(void)lh_MEM_insert(mh, mp);
}
CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ENABLE);
}
break;
}
return;
}
typedef struct mem_leak_st {
int (*print_cb) (const char *str, size_t len, void *u);
void *print_cb_arg;
int chunks;
long bytes;
} MEM_LEAK;
static void print_leak(const MEM *m, MEM_LEAK *l)
{
char buf[1024];
char *bufp = buf;
size_t len = sizeof(buf), ami_cnt;
APP_INFO *amip;
int n;
struct tm *lcl = NULL;
/*
* Convert between CRYPTO_THREAD_ID (which could be anything at all) and
* a long. This may not be meaningful depending on what CRYPTO_THREAD_ID is
* but hopefully should give something sensible on most platforms
*/
union {
CRYPTO_THREAD_ID tid;
unsigned long ltid;
} tid;
CRYPTO_THREAD_ID ti;
lcl = localtime(&m->time);
n = BIO_snprintf(bufp, len, "[%02d:%02d:%02d] ",
lcl->tm_hour, lcl->tm_min, lcl->tm_sec);
if (n <= 0) {
bufp[0] = '\0';
return;
}
bufp += n;
len -= n;
n = BIO_snprintf(bufp, len, "%5lu file=%s, line=%d, ",
m->order, m->file, m->line);
if (n <= 0)
return;
bufp += n;
len -= n;
tid.ltid = 0;
tid.tid = m->threadid;
n = BIO_snprintf(bufp, len, "thread=%lu, ", tid.ltid);
if (n <= 0)
return;
bufp += n;
len -= n;
n = BIO_snprintf(bufp, len, "number=%d, address=%p\n", m->num, m->addr);
if (n <= 0)
return;
bufp += n;
len -= n;
l->print_cb(buf, (size_t)(bufp - buf), l->print_cb_arg);
l->chunks++;
l->bytes += m->num;
amip = m->app_info;
ami_cnt = 0;
if (amip) {
ti = amip->threadid;
do {
int buf_len;
int info_len;
ami_cnt++;
if (ami_cnt >= sizeof(buf) - 1)
break;
memset(buf, '>', ami_cnt);
buf[ami_cnt] = '\0';
tid.ltid = 0;
tid.tid = amip->threadid;
n = BIO_snprintf(buf + ami_cnt, sizeof(buf) - ami_cnt,
" thread=%lu, file=%s, line=%d, info=\"",
tid.ltid, amip->file, amip->line);
if (n <= 0)
break;
buf_len = ami_cnt + n;
info_len = strlen(amip->info);
if (128 - buf_len - 3 < info_len) {
memcpy(buf + buf_len, amip->info, 128 - buf_len - 3);
buf_len = 128 - 3;
} else {
n = BIO_snprintf(buf + buf_len, sizeof(buf) - buf_len, "%s",
amip->info);
if (n < 0)
break;
buf_len += n;
}
n = BIO_snprintf(buf + buf_len, sizeof(buf) - buf_len, "\"\n");
if (n <= 0)
break;
l->print_cb(buf, buf_len + n, l->print_cb_arg);
amip = amip->next;
}
while (amip && CRYPTO_THREAD_compare_id(amip->threadid, ti));
}
#ifndef OPENSSL_NO_CRYPTO_MDEBUG_BACKTRACE
{
size_t i;
char **strings = backtrace_symbols(m->array, m->array_siz);
for (i = 0; i < m->array_siz; i++)
fprintf(stderr, "##> %s\n", strings[i]);
free(strings);
}
#endif
}
IMPLEMENT_LHASH_DOALL_ARG_CONST(MEM, MEM_LEAK);
int CRYPTO_mem_leaks_cb(int (*cb) (const char *str, size_t len, void *u),
void *u)
{
MEM_LEAK ml;
/* Ensure all resources are released */
OPENSSL_cleanup();
if (!RUN_ONCE(&memdbg_init, do_memdbg_init))
return -1;
CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_DISABLE);
ml.print_cb = cb;
ml.print_cb_arg = u;
ml.bytes = 0;
ml.chunks = 0;
if (mh != NULL)
lh_MEM_doall_MEM_LEAK(mh, print_leak, &ml);
if (ml.chunks != 0) {
char buf[256];
BIO_snprintf(buf, sizeof(buf), "%ld bytes leaked in %d chunks\n",
ml.bytes, ml.chunks);
cb(buf, strlen(buf), u);
} else {
/*
* Make sure that, if we found no leaks, memory-leak debugging itself
* does not introduce memory leaks (which might irritate external
* debugging tools). (When someone enables leak checking, but does not
* call this function, we declare it to be their fault.)
*/
int old_mh_mode;
CRYPTO_THREAD_write_lock(memdbg_lock);
/*
* avoid deadlock when lh_free() uses CRYPTO_mem_debug_free(), which uses
* mem_check_on
*/
old_mh_mode = mh_mode;
mh_mode = CRYPTO_MEM_CHECK_OFF;
lh_MEM_free(mh);
mh = NULL;
mh_mode = old_mh_mode;
CRYPTO_THREAD_unlock(memdbg_lock);
}
CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_OFF);
/* Clean up locks etc */
CRYPTO_THREAD_cleanup_local(&appinfokey);
CRYPTO_THREAD_lock_free(memdbg_lock);
CRYPTO_THREAD_lock_free(long_memdbg_lock);
memdbg_lock = NULL;
long_memdbg_lock = NULL;
return ml.chunks == 0 ? 1 : 0;
}
static int print_bio(const char *str, size_t len, void *b)
{
return BIO_write((BIO *)b, str, len);
}
int CRYPTO_mem_leaks(BIO *b)
{
/*
* OPENSSL_cleanup() will free the ex_data locks so we can't have any
* ex_data hanging around
*/
bio_free_ex_data(b);
return CRYPTO_mem_leaks_cb(print_bio, b);
}
# ifndef OPENSSL_NO_STDIO
int CRYPTO_mem_leaks_fp(FILE *fp)
{
BIO *b;
int ret;
/*
* Need to turn off memory checking when allocated BIOs ... especially as
* we're creating them at a time when we're trying to check we've not
* left anything un-free()'d!!
*/
CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_DISABLE);
b = BIO_new(BIO_s_file());
CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ENABLE);
if (b == NULL)
return -1;
BIO_set_fp(b, fp, BIO_NOCLOSE);
ret = CRYPTO_mem_leaks_cb(print_bio, b);
BIO_free(b);
return ret;
}
# endif
#endif
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