X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=crypto%2Fmem.c;h=f7984fa958eb1edd6c61f6667f3f2b29753be662;hp=8b3f109ea6862f690ce54ea5e72b22f34d3d7a19;hb=86a2f966d0099d87dc2e2a05a923a26ebc182dea;hpb=65a22e8e4dd1763a195b5c4ff8ff2574a13b3240

diff --git a/crypto/mem.c b/crypto/mem.c
index 8b3f109ea6..f7984fa958 100644
--- a/crypto/mem.c
+++ b/crypto/mem.c
@@ -70,28 +70,36 @@ static int allow_customize_debug = 1;/* exchanging memory-related functions at
                                       * problems when malloc/free pairs
                                       * don't match etc. */
 
-/* may be changed as long as `allow_customize' is set */
-static void *(*malloc_locked_func)(size_t)  = malloc;
-static void (*free_locked_func)(void *)     = free;
+
+
+/* the following pointers may be changed as long as 'allow_customize' is set */
+
 static void *(*malloc_func)(size_t)         = malloc;
+static void *default_malloc_ex(size_t num, const char *file, int line)
+	{ return malloc_func(num); }
+static void *(*malloc_ex_func)(size_t, const char *file, int line)
+        = default_malloc_ex;
+
 static void *(*realloc_func)(void *, size_t)= realloc;
+static void *default_realloc_ex(void *str, size_t num,
+        const char *file, int line)
+	{ return realloc_func(str,num); }
+static void *(*realloc_ex_func)(void *, size_t, const char *file, int line)
+        = default_realloc_ex;
+
 static void (*free_func)(void *)            = free;
 
-static void *crypto_i_malloc_ex(size_t, const char *file, int line);
-static void *crypto_i_realloc_ex(void *, size_t, const char *file, int line);
-static void crypto_i_free_ex(void *);
+static void *(*malloc_locked_func)(size_t)  = malloc;
+static void *default_malloc_locked_ex(size_t num, const char *file, int line)
+	{ return malloc_locked_func(num); }
 static void *(*malloc_locked_ex_func)(size_t, const char *file, int line)
-        = crypto_i_malloc_ex;
-static void (*free_locked_ex_func)(void *)
-        = crypto_i_free_ex;
-static void *(*malloc_ex_func)(size_t, const char *file, int line)
-        = crypto_i_malloc_ex;
-static void *(*realloc_ex_func)(void *, size_t, const char *file, int line)
-        = crypto_i_realloc_ex;
-static void (*free_ex_func)(void *)
-        = crypto_i_free_ex;
+        = default_malloc_locked_ex;
+
+static void (*free_locked_func)(void *)     = free;
+
 
-/* may be changed as long as `allow_customize_debug' is set */
+
+/* may be changed as long as 'allow_customize_debug' is set */
 /* XXX use correct function pointer types */
 #ifdef CRYPTO_MDEBUG
 /* use default functions from mem_dbg.c */
@@ -113,18 +121,19 @@ static void (*set_debug_options_func)(long) = NULL;
 static long (*get_debug_options_func)(void) = NULL;
 #endif
 
-
 int CRYPTO_set_mem_functions(void *(*m)(size_t), void *(*r)(void *, size_t),
 	void (*f)(void *))
 	{
+	/* Dummy call just to ensure OPENSSL_init() gets linked in */
+	OPENSSL_init();
 	if (!allow_customize)
 		return 0;
-	if ((m == NULL) || (r == NULL) || (f == NULL))
+	if ((m == 0) || (r == 0) || (f == 0))
 		return 0;
-	malloc_func=m;
-	realloc_func=r;
+	malloc_func=m; malloc_ex_func=default_malloc_ex;
+	realloc_func=r; realloc_ex_func=default_realloc_ex;
 	free_func=f;
-	malloc_locked_func=m;
+	malloc_locked_func=m; malloc_locked_ex_func=default_malloc_locked_ex;
 	free_locked_func=f;
 	return 1;
 	}
@@ -136,14 +145,13 @@ int CRYPTO_set_mem_ex_functions(
 	{
 	if (!allow_customize)
 		return 0;
-        if (m == NULL) m = crypto_i_malloc_ex;
-        if (r == NULL) r = crypto_i_realloc_ex;
-        if (f == NULL) f = crypto_i_free_ex;
-	malloc_ex_func=m;
-	realloc_ex_func=r;
-	free_ex_func=f;
-	malloc_locked_ex_func=m;
-	free_locked_ex_func=f;
+	if ((m == 0) || (r == 0) || (f == 0))
+		return 0;
+	malloc_func=0; malloc_ex_func=m;
+	realloc_func=0; realloc_ex_func=r;
+	free_func=f;
+	malloc_locked_func=0; malloc_locked_ex_func=m;
+	free_locked_func=f;
 	return 1;
 	}
 
@@ -153,7 +161,7 @@ int CRYPTO_set_locked_mem_functions(void *(*m)(size_t), void (*f)(void *))
 		return 0;
 	if ((m == NULL) || (f == NULL))
 		return 0;
-	malloc_locked_func=m;
+	malloc_locked_func=m; malloc_locked_ex_func=default_malloc_locked_ex;
 	free_locked_func=f;
 	return 1;
 	}
@@ -164,10 +172,10 @@ int CRYPTO_set_locked_mem_ex_functions(
 	{
 	if (!allow_customize)
 		return 0;
-        if (m == NULL) m = crypto_i_malloc_ex;
-        if (f == NULL) f = crypto_i_free_ex;
-	malloc_locked_ex_func=m;
-	free_locked_ex_func=f;
+	if ((m == NULL) || (f == NULL))
+		return 0;
+	malloc_locked_func=0; malloc_locked_ex_func=m;
+	free_func=f;
 	return 1;
 	}
 
@@ -187,11 +195,14 @@ int CRYPTO_set_mem_debug_functions(void (*m)(void *,int,const char *,int,int),
 	return 1;
 	}
 
+
 void CRYPTO_get_mem_functions(void *(**m)(size_t), void *(**r)(void *, size_t),
 	void (**f)(void *))
 	{
-	if (m != NULL) *m=malloc_func;
-	if (r != NULL) *r=realloc_func;
+	if (m != NULL) *m = (malloc_ex_func == default_malloc_ex) ? 
+	                     malloc_func : 0;
+	if (r != NULL) *r = (realloc_ex_func == default_realloc_ex) ? 
+	                     realloc_func : 0;
 	if (f != NULL) *f=free_func;
 	}
 
@@ -200,14 +211,17 @@ void CRYPTO_get_mem_ex_functions(
         void *(**r)(void *, size_t,const char *,int),
 	void (**f)(void *))
 	{
-	if (m != NULL) *m=malloc_ex_func;
-	if (r != NULL) *r=realloc_ex_func;
-	if (f != NULL) *f=free_ex_func;
+	if (m != NULL) *m = (malloc_ex_func != default_malloc_ex) ?
+	                    malloc_ex_func : 0;
+	if (r != NULL) *r = (realloc_ex_func != default_realloc_ex) ?
+	                    realloc_ex_func : 0;
+	if (f != NULL) *f=free_func;
 	}
 
 void CRYPTO_get_locked_mem_functions(void *(**m)(size_t), void (**f)(void *))
 	{
-	if (m != NULL) *m=malloc_locked_func;
+	if (m != NULL) *m = (malloc_locked_ex_func == default_malloc_locked_ex) ? 
+	                     malloc_locked_func : 0;
 	if (f != NULL) *f=free_locked_func;
 	}
 
@@ -215,8 +229,9 @@ void CRYPTO_get_locked_mem_ex_functions(
         void *(**m)(size_t,const char *,int),
         void (**f)(void *))
 	{
-	if (m != NULL) *m=malloc_locked_ex_func;
-	if (f != NULL) *f=free_locked_ex_func;
+	if (m != NULL) *m = (malloc_locked_ex_func != default_malloc_locked_ex) ?
+	                    malloc_locked_ex_func : 0;
+	if (f != NULL) *f=free_locked_func;
 	}
 
 void CRYPTO_get_mem_debug_functions(void (**m)(void *,int,const char *,int,int),
@@ -237,6 +252,8 @@ void *CRYPTO_malloc_locked(int num, const char *file, int line)
 	{
 	void *ret = NULL;
 
+	if (num <= 0) return NULL;
+
 	allow_customize = 0;
 	if (malloc_debug_func != NULL)
 		{
@@ -250,6 +267,16 @@ void *CRYPTO_malloc_locked(int num, const char *file, int line)
 	if (malloc_debug_func != NULL)
 		malloc_debug_func(ret, num, file, line, 1);
 
+#ifndef OPENSSL_CPUID_OBJ
+        /* Create a dependency on the value of 'cleanse_ctr' so our memory
+         * sanitisation function can't be optimised out. NB: We only do
+         * this for >2Kb so the overhead doesn't bother us. */
+        if(ret && (num > 2048))
+	{	extern unsigned char cleanse_ctr;
+		((unsigned char *)ret)[0] = cleanse_ctr;
+	}
+#endif
+
 	return ret;
 	}
 
@@ -260,7 +287,7 @@ void CRYPTO_free_locked(void *str)
 #ifdef LEVITTE_DEBUG_MEM
 	fprintf(stderr, "LEVITTE_DEBUG_MEM:         < 0x%p\n", str);
 #endif
-	free_locked_ex_func(str);
+	free_locked_func(str);
 	if (free_debug_func != NULL)
 		free_debug_func(NULL, 1);
 	}
@@ -269,6 +296,8 @@ void *CRYPTO_malloc(int num, const char *file, int line)
 	{
 	void *ret = NULL;
 
+	if (num <= 0) return NULL;
+
 	allow_customize = 0;
 	if (malloc_debug_func != NULL)
 		{
@@ -282,6 +311,23 @@ void *CRYPTO_malloc(int num, const char *file, int line)
 	if (malloc_debug_func != NULL)
 		malloc_debug_func(ret, num, file, line, 1);
 
+#ifndef OPENSSL_CPUID_OBJ
+        /* Create a dependency on the value of 'cleanse_ctr' so our memory
+         * sanitisation function can't be optimised out. NB: We only do
+         * this for >2Kb so the overhead doesn't bother us. */
+        if(ret && (num > 2048))
+	{	extern unsigned char cleanse_ctr;
+                ((unsigned char *)ret)[0] = cleanse_ctr;
+	}
+#endif
+
+	return ret;
+	}
+char *CRYPTO_strdup(const char *str, const char *file, int line)
+	{
+	char *ret = CRYPTO_malloc(strlen(str)+1, file, line);
+
+	strcpy(ret, str);
 	return ret;
 	}
 
@@ -289,6 +335,11 @@ void *CRYPTO_realloc(void *str, int num, const char *file, int line)
 	{
 	void *ret = NULL;
 
+	if (str == NULL)
+		return CRYPTO_malloc(num, file, line);
+
+	if (num <= 0) return NULL;
+
 	if (realloc_debug_func != NULL)
 		realloc_debug_func(str, NULL, num, file, line, 0);
 	ret = realloc_ex_func(str,num,file,line);
@@ -301,6 +352,40 @@ void *CRYPTO_realloc(void *str, int num, const char *file, int line)
 	return ret;
 	}
 
+void *CRYPTO_realloc_clean(void *str, int old_len, int num, const char *file,
+			   int line)
+	{
+	void *ret = NULL;
+
+	if (str == NULL)
+		return CRYPTO_malloc(num, file, line);
+
+	if (num <= 0) return NULL;
+
+	/* We don't support shrinking the buffer. Note the memcpy that copies
+	 * |old_len| bytes to the new buffer, below. */
+	if (num < old_len) return NULL;
+
+	if (realloc_debug_func != NULL)
+		realloc_debug_func(str, NULL, num, file, line, 0);
+	ret=malloc_ex_func(num,file,line);
+	if(ret)
+		{
+		memcpy(ret,str,old_len);
+		OPENSSL_cleanse(str,old_len);
+		free_func(str);
+		}
+#ifdef LEVITTE_DEBUG_MEM
+	fprintf(stderr,
+		"LEVITTE_DEBUG_MEM:         | 0x%p -> 0x%p (%d)\n",
+		str, ret, num);
+#endif
+	if (realloc_debug_func != NULL)
+		realloc_debug_func(str, ret, num, file, line, 1);
+
+	return ret;
+	}
+
 void CRYPTO_free(void *str)
 	{
 	if (free_debug_func != NULL)
@@ -308,7 +393,7 @@ void CRYPTO_free(void *str)
 #ifdef LEVITTE_DEBUG_MEM
 	fprintf(stderr, "LEVITTE_DEBUG_MEM:         < 0x%p\n", str);
 #endif
-	free_ex_func(str);
+	free_func(str);
 	if (free_debug_func != NULL)
 		free_debug_func(NULL, 1);
 	}
@@ -320,7 +405,6 @@ void *CRYPTO_remalloc(void *a, int num, const char *file, int line)
 	return(a);
 	}
 
-
 void CRYPTO_set_mem_debug_options(long bits)
 	{
 	if (set_debug_options_func != NULL)
@@ -333,19 +417,3 @@ long CRYPTO_get_mem_debug_options(void)
 		return get_debug_options_func();
 	return 0;
 	}
-
-static void *crypto_i_malloc_ex(size_t num, const char *file, int line)
-        {
-        return malloc_func(num);
-        }
-
-static void *crypto_i_realloc_ex(void *str, size_t num,
-        const char *file, int line)
-        {
-        return realloc_func(str,num);
-        }
-
-static void crypto_i_free_ex(void *str)
-        {
-        free_func(str);
-        }