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8bcceacf3470afd9cd689a663292ea79e22e9db0
openssl/crypto/mem_dbg.c
Bodo Möller 2fb0c899c6 Include CRYPTO_mem_leaks deadlock fix.
2000-12-20 10:07:31 +00:00

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/* crypto/mem_dbg.c */
/* 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 <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <openssl/crypto.h>
#include <openssl/buffer.h>
#include <openssl/bio.h>
#include <openssl/lhash.h>
#include "cryptlib.h"
static int mh_mode=CRYPTO_MEM_CHECK_OFF;
/* 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.
*/
static unsigned long order = 0; /* number of memory requests */
static LHASH *mh=NULL; /* hash-table of memory requests (address as key) */
typedef struct app_mem_info_st
/* 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
* CRYPTO_push_info("...") to push an entry,
* CRYPTO_pop_info() to pop an entry,
* CRYPTO_remove_all_info() to pop all entries.
*/
{
unsigned long thread;
const char *file;
int line;
const char *info;
struct app_mem_info_st *next; /* tail of thread's stack */
int references;
} APP_INFO;
static LHASH *amih=NULL; /* hash-table with those app_mem_info_st's
* that are at the top of their thread's stack
* (with `thread' as key) */
typedef struct mem_st
/* memory-block description */
{
void *addr;
int num;
const char *file;
int line;
unsigned long thread;
unsigned long order;
time_t time;
APP_INFO *app_info;
} MEM;
static long options = /* extra information to be recorded */
#if defined(CRYPTO_MDEBUG_TIME) || defined(CRYPTO_MDEBUG_ALL)
V_CRYPTO_MDEBUG_TIME |
#endif
#if defined(CRYPTO_MDEBUG_THREAD) || defined(CRYPTO_MDEBUG_ALL)
V_CRYPTO_MDEBUG_THREAD |
#endif
0;
static unsigned long disabling_thread = 0;
int CRYPTO_mem_ctrl(int mode)
{
int ret=mh_mode;
CRYPTO_w_lock(CRYPTO_LOCK_MALLOC);
switch (mode)
{
/* for applications: */
case CRYPTO_MEM_CHECK_ON: /* aka MemCheck_start() */
mh_mode = CRYPTO_MEM_CHECK_ON|CRYPTO_MEM_CHECK_ENABLE;
disabling_thread = 0;
break;
case CRYPTO_MEM_CHECK_OFF: /* aka MemCheck_stop() */
mh_mode = 0;
disabling_thread = 0;
break;
/* switch off temporarily (for library-internal use): */
case CRYPTO_MEM_CHECK_DISABLE: /* aka MemCheck_off() */
if (mh_mode & CRYPTO_MEM_CHECK_ON)
{
mh_mode&= ~CRYPTO_MEM_CHECK_ENABLE;
if (disabling_thread != CRYPTO_thread_id()) /* otherwise we already have the MALLOC2 lock */
{
/* Long-time lock CRYPTO_LOCK_MALLOC2 must not be claimed while
* we're holding CRYPTO_LOCK_MALLOC, or we'll deadlock if
* somebody else holds CRYPTO_LOCK_MALLOC2 (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_w_unlock(CRYPTO_LOCK_MALLOC);
/* Note that after we have waited for CRYPTO_LOCK_MALLOC2
* and CRYPTO_LOCK_MALLOC, 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_w_lock(CRYPTO_LOCK_MALLOC2);
CRYPTO_w_lock(CRYPTO_LOCK_MALLOC);
disabling_thread=CRYPTO_thread_id();
}
}
break;
case CRYPTO_MEM_CHECK_ENABLE: /* aka MemCheck_on() */
if (mh_mode & CRYPTO_MEM_CHECK_ON)
{
mh_mode|=CRYPTO_MEM_CHECK_ENABLE;
if (disabling_thread != 0)
{
disabling_thread=0;
CRYPTO_w_unlock(CRYPTO_LOCK_MALLOC2);
}
}
break;
default:
break;
}
CRYPTO_w_unlock(CRYPTO_LOCK_MALLOC);
return(ret);
}
int CRYPTO_is_mem_check_on(void)
{
int ret = 0;
if (mh_mode & CRYPTO_MEM_CHECK_ON)
{
CRYPTO_w_lock(CRYPTO_LOCK_MALLOC);
ret = (mh_mode & CRYPTO_MEM_CHECK_ENABLE)
&& disabling_thread != CRYPTO_thread_id();
CRYPTO_w_unlock(CRYPTO_LOCK_MALLOC);
}
return(ret);
}
void CRYPTO_dbg_set_options(long bits)
{
options = bits;
}
long CRYPTO_dbg_get_options(void)
{
return options;
}
static int mem_cmp(MEM *a, MEM *b)
{
return((char *)a->addr - (char *)b->addr);
}
static unsigned long mem_hash(MEM *a)
{
unsigned long ret;
ret=(unsigned long)a->addr;
ret=ret*17851+(ret>>14)*7+(ret>>4)*251;
return(ret);
}
static int app_info_cmp(APP_INFO *a, APP_INFO *b)
{
return(a->thread != b->thread);
}
static unsigned long app_info_hash(APP_INFO *a)
{
unsigned long ret;
ret=(unsigned long)a->thread;
ret=ret*17851+(ret>>14)*7+(ret>>4)*251;
return(ret);
}
static APP_INFO *pop_info()
{
APP_INFO tmp;
APP_INFO *ret = NULL;
if (amih != NULL)
{
tmp.thread=CRYPTO_thread_id();
if ((ret=(APP_INFO *)lh_delete(amih,&tmp)) != NULL)
{
APP_INFO *next=ret->next;
if (next != NULL)
{
next->references++;
lh_insert(amih,(char *)next);
}
#ifdef LEVITTE_DEBUG
if (ret->thread != tmp.thread)
{
fprintf(stderr, "pop_info(): deleted info has other thread ID (%lu) than the current thread (%lu)!!!!\n",
ret->thread, tmp.thread);
abort();
}
#endif
if (--(ret->references) <= 0)
{
ret->next = NULL;
if (next != NULL)
next->references--;
OPENSSL_free(ret);
}
}
}
return(ret);
}
int CRYPTO_push_info_(const char *info, const char *file, int line)
{
APP_INFO *ami, *amim;
int ret=0;
if (is_MemCheck_on())
{
MemCheck_off(); /* obtains CRYPTO_LOCK_MALLOC2 */
if ((ami = (APP_INFO *)OPENSSL_malloc(sizeof(APP_INFO))) == NULL)
{
ret=0;
goto err;
}
if (amih == NULL)
{
if ((amih=lh_new(app_info_hash,app_info_cmp)) == NULL)
{
OPENSSL_free(ami);
ret=0;
goto err;
}
}
ami->thread=CRYPTO_thread_id();
ami->file=file;
ami->line=line;
ami->info=info;
ami->references=1;
ami->next=NULL;
if ((amim=(APP_INFO *)lh_insert(amih,(char *)ami)) != NULL)
{
#ifdef LEVITTE_DEBUG
if (ami->thread != amim->thread)
{
fprintf(stderr, "CRYPTO_push_info(): previous info has other thread ID (%lu) than the current thread (%lu)!!!!\n",
amim->thread, ami->thread);
abort();
}
#endif
ami->next=amim;
}
err:
MemCheck_on(); /* releases CRYPTO_LOCK_MALLOC2 */
}
return(ret);
}
int CRYPTO_pop_info(void)
{
int ret=0;
if (is_MemCheck_on()) /* _must_ be true, or something went severely wrong */
{
MemCheck_off(); /* obtains CRYPTO_LOCK_MALLOC2 */
ret=(pop_info() != NULL);
MemCheck_on(); /* releases CRYPTO_LOCK_MALLOC2 */
}
return(ret);
}
int CRYPTO_remove_all_info(void)
{
int ret=0;
if (is_MemCheck_on()) /* _must_ be true */
{
MemCheck_off(); /* obtains CRYPTO_LOCK_MALLOC2 */
while(pop_info() != NULL)
ret++;
MemCheck_on(); /* releases CRYPTO_LOCK_MALLOC2 */
}
return(ret);
}
static unsigned long break_order_num=0;
void CRYPTO_dbg_malloc(void *addr, int num, const char *file, int line,
int before_p)
{
MEM *m,*mm;
APP_INFO tmp,*amim;
switch(before_p & 127)
{
case 0:
break;
case 1:
if (addr == NULL)
break;
if (is_MemCheck_on())
{
MemCheck_off(); /* obtains CRYPTO_LOCK_MALLOC2 */
if ((m=(MEM *)OPENSSL_malloc(sizeof(MEM))) == NULL)
{
OPENSSL_free(addr);
MemCheck_on(); /* releases CRYPTO_LOCK_MALLOC2 */
return;
}
if (mh == NULL)
{
if ((mh=lh_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;
if (options & V_CRYPTO_MDEBUG_THREAD)
m->thread=CRYPTO_thread_id();
else
m->thread=0;
if (order == break_order_num)
{
/* BREAK HERE */
m->order=order;
}
m->order=order++;
#ifdef LEVITTE_DEBUG
fprintf(stderr, "LEVITTE_DEBUG: [%5d] %c 0x%p (%d)\n",
m->order,
(before_p & 128) ? '*' : '+',
m->addr, m->num);
#endif
if (options & V_CRYPTO_MDEBUG_TIME)
m->time=time(NULL);
else
m->time=0;
tmp.thread=CRYPTO_thread_id();
m->app_info=NULL;
if (amih != NULL
&& (amim=(APP_INFO *)lh_retrieve(amih,(char *)&tmp)) != NULL)
{
m->app_info = amim;
amim->references++;
}
if ((mm=(MEM *)lh_insert(mh,(char *)m)) != NULL)
{
/* Not good, but don't sweat it */
if (mm->app_info != NULL)
{
mm->app_info->references--;
}
OPENSSL_free(mm);
}
err:
MemCheck_on(); /* releases CRYPTO_LOCK_MALLOC2 */
}
break;
}
return;
}
void CRYPTO_dbg_free(void *addr, int before_p)
{
MEM m,*mp;
switch(before_p)
{
case 0:
if (addr == NULL)
break;
if (is_MemCheck_on() && (mh != NULL))
{
MemCheck_off();
m.addr=addr;
mp=(MEM *)lh_delete(mh,(char *)&m);
if (mp != NULL)
{
#ifdef LEVITTE_DEBUG
fprintf(stderr, "LEVITTE_DEBUG: [%5d] - 0x%p (%d)\n",
mp->order, mp->addr, mp->num);
#endif
if (mp->app_info != NULL)
{
mp->app_info->references--;
}
OPENSSL_free(mp);
}
MemCheck_on(); /* releases CRYPTO_LOCK_MALLOC2 */
}
break;
case 1:
break;
}
}
void CRYPTO_dbg_realloc(void *addr1, void *addr2, int num,
const char *file, int line, int before_p)
{
MEM m,*mp;
#ifdef LEVITTE_DEBUG
fprintf(stderr, "LEVITTE_DEBUG: --> CRYPTO_dbg_malloc(addr1 = %p, addr2 = %p, num = %d, file = \"%s\", line = %d, before_p = %d)\n",
addr1, addr2, num, file, line, before_p);
#endif
switch(before_p)
{
case 0:
break;
case 1:
if (addr2 == NULL)
break;
if (addr1 == NULL)
{
CRYPTO_dbg_malloc(addr2, num, file, line, 128 | before_p);
break;
}
if (is_MemCheck_on())
{
MemCheck_off(); /* obtains CRYPTO_LOCK_MALLOC2 */
m.addr=addr1;
mp=(MEM *)lh_delete(mh,(char *)&m);
if (mp != NULL)
{
#ifdef LEVITTE_DEBUG
fprintf(stderr, "LEVITTE_DEBUG: [%5d] * 0x%p (%d) -> 0x%p (%d)\n",
mp->order,
mp->addr, mp->num,
addr2, num);
#endif
mp->addr=addr2;
mp->num=num;
lh_insert(mh,(char *)mp);
}
MemCheck_on(); /* releases CRYPTO_LOCK_MALLOC2 */
}
break;
}
return;
}
typedef struct mem_leak_st
{
BIO *bio;
int chunks;
long bytes;
} MEM_LEAK;
static void print_leak(MEM *m, MEM_LEAK *l)
{
char buf[1024];
char *bufp = buf;
APP_INFO *amip;
int ami_cnt;
struct tm *lcl = NULL;
unsigned long ti;
if(m->addr == (char *)l->bio)
return;
if (options & V_CRYPTO_MDEBUG_TIME)
{
lcl = localtime(&m->time);
sprintf(bufp, "[%02d:%02d:%02d] ",
lcl->tm_hour,lcl->tm_min,lcl->tm_sec);
bufp += strlen(bufp);
}
sprintf(bufp, "%5lu file=%s, line=%d, ",
m->order,m->file,m->line);
bufp += strlen(bufp);
if (options & V_CRYPTO_MDEBUG_THREAD)
{
sprintf(bufp, "thread=%lu, ", m->thread);
bufp += strlen(bufp);
}
sprintf(bufp, "number=%d, address=%08lX\n",
m->num,(unsigned long)m->addr);
bufp += strlen(bufp);
BIO_puts(l->bio,buf);
l->chunks++;
l->bytes+=m->num;
amip=m->app_info;
ami_cnt=0;
if (!amip)
return;
ti=amip->thread;
do
{
int buf_len;
int info_len;
ami_cnt++;
memset(buf,'>',ami_cnt);
sprintf(buf + ami_cnt,
" thread=%lu, file=%s, line=%d, info=\"",
amip->thread, amip->file, amip->line);
buf_len=strlen(buf);
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
{
strcpy(buf + buf_len, amip->info);
buf_len = strlen(buf);
}
sprintf(buf + buf_len, "\"\n");
BIO_puts(l->bio,buf);
amip = amip->next;
}
while(amip && amip->thread == ti);
#ifdef LEVITTE_DEBUG
if (amip)
{
fprintf(stderr, "Thread switch detected in backtrace!!!!\n");
abort();
}
#endif
}
void CRYPTO_mem_leaks(BIO *b)
{
MEM_LEAK ml;
char buf[80];
if (mh == NULL && amih == NULL)
return;
ml.bio=b;
ml.bytes=0;
ml.chunks=0;
MemCheck_off(); /* obtains CRYPTO_LOCK_MALLOC2 */
if (mh != NULL)
lh_doall_arg(mh,(void (*)())print_leak,(char *)&ml);
if (ml.chunks != 0)
{
sprintf(buf,"%ld bytes leaked in %d chunks\n",
ml.bytes,ml.chunks);
BIO_puts(b,buf);
}
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.)
*
* XXX This should be in CRYPTO_mem_leaks_cb,
* and CRYPTO_mem_leaks should be implemented by
* using CRYPTO_mem_leaks_cb.
* (Also their should be a variant of lh_doall_arg
* that takes a function pointer instead of a void *;
* this would obviate the ugly and illegal
* void_fn_to_char kludge in CRYPTO_mem_leaks_cb.
* Otherwise the code police will come and get us.)
*/
int old_mh_mode;
CRYPTO_w_lock(CRYPTO_LOCK_MALLOC);
/* avoid deadlock when lh_free() uses CRYPTO_dbg_free(),
* which uses CRYPTO_is_mem_check_on */
old_mh_mode = mh_mode;
mh_mode = CRYPTO_MEM_CHECK_OFF;
if (mh != NULL)
{
lh_free(mh);
mh = NULL;
}
if (amih != NULL)
{
if (lh_num_items(amih) == 0)
{
lh_free(amih);
amih = NULL;
}
}
mh_mode = old_mh_mode;
CRYPTO_w_unlock(CRYPTO_LOCK_MALLOC);
}
MemCheck_on(); /* releases CRYPTO_LOCK_MALLOC2 */
#if 0
lh_stats_bio(mh,b);
lh_node_stats_bio(mh,b);
lh_node_usage_stats_bio(mh,b);
#endif
}
#ifndef NO_FP_API
void CRYPTO_mem_leaks_fp(FILE *fp)
{
BIO *b;
if (mh == NULL) return;
if ((b=BIO_new(BIO_s_file())) == NULL)
return;
BIO_set_fp(b,fp,BIO_NOCLOSE);
CRYPTO_mem_leaks(b);
BIO_free(b);
}
#endif
/* FIXME: We really don't allow much to the callback. For example, it has
no chance of reaching the info stack for the item it processes. Should
it really be this way? -- Richard Levitte */
static void cb_leak(MEM *m,
void (**cb)(unsigned long, const char *, int, int, void *))
{
(**cb)(m->order,m->file,m->line,m->num,m->addr);
}
void CRYPTO_mem_leaks_cb(void (*cb)(unsigned long, const char *, int, int, void *))
{
if (mh == NULL) return;
CRYPTO_w_lock(CRYPTO_LOCK_MALLOC2);
lh_doall_arg(mh,(void (*)())cb_leak,(void *)&cb);
CRYPTO_w_unlock(CRYPTO_LOCK_MALLOC2);
}
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