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Code Issues Releases Wiki Activity

Added helper method to securely scrub memory

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This commit is contained in:
Bryan Roe
2020-10-16 18:48:25 -07:00
parent f5906fac77
commit d895d92e07
5 changed files with 34 additions and 5 deletions
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2
microscript/ILibDuktape_Helpers.c
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@@ -56,7 +56,7 @@ duk_ret_t duk_fixed_buffer_finalizer(duk_context *ctx)
{
duk_size_t bufLen;
char *buf = (char*)Duktape_GetBuffer(ctx, 0, &bufLen);
memset(buf, 0, bufLen);
ILibMemory_SecureZero(buf, bufLen);
return(0);
}
void duk_buffer_enable_autoclear(duk_context *ctx)

2
microscript/ILibDuktape_ScriptContainer.c
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@@ -1559,7 +1559,7 @@ void ILibDuktape_ScriptContainer_Engine_free(void *udata, void *ptr)
if (ptr != NULL)
{
ILibDuktape_ScriptContainer_TotalAllocations -= ILibMemory_Size(ptr);
memset(ptr, 0xDEADBEEF, sz);
ILibMemory_SecureZero(ptr, sz);
ILibMemory_Free(ptr);
}
}

32
microstack/ILibParsers.c
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@@ -15,6 +15,12 @@ limitations under the License.
*/
#define _GNU_SOURCE
#if !defined(WIN32)
#include <strings.h>
#if !defined(MICROSTACK_NOTLS)
#include <openssl/crypto.h>
#endif
#endif
#if defined (__APPLE__)
#include <sys/uio.h>
#include <sys/mount.h>
@@ -1065,15 +1071,37 @@ void* ILibMemory_Init(void *ptr, size_t primarySize, size_t extraSize, ILibMemor
return(primary);
}
void ILibMemory_SecureZero(void *ptr, size_t len)
{
#if !defined(MICROSTACK_NOTLS)
OPENSSL_cleanse(ptr, len);
#else
#if defined(WIN32)
SecureZeroMemory(ptr, len);
#else
#ifdef __GLIBC__
#if (__GLIBC__ > 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR__ >= 24))
explicit_bzero(ptr, len);
#else
memset(ptr, 0, len);
__asm__ __volatile__("": : : "memory");
#endif
#else
memset(ptr, 0, len);
__asm__ __volatile__("": : : "memory");
#endif
#endif
#endif
}
void ILibMemory_Free(void *ptr)
{
if (ILibMemory_CanaryOK(ptr) && ILibMemory_MemType(ptr) == ILibMemory_Types_HEAP)
{
if (ILibMemory_ExtraSize(ptr) > 0)
{
memset(ILibMemory_RawPtr(ILibMemory_Extra(ptr)), 0, sizeof(ILibMemory_Header));
ILibMemory_SecureZero(ILibMemory_RawPtr(ILibMemory_Extra(ptr)), sizeof(ILibMemory_Header));
}
memset(ILibMemory_RawPtr(ptr), 0, sizeof(ILibMemory_Header));
ILibMemory_SecureZero(ILibMemory_RawPtr(ptr), sizeof(ILibMemory_Header));
free(ILibMemory_RawPtr(ptr));
}
}

1
microstack/ILibParsers.h
View File

@@ -440,6 +440,7 @@ int ILibIsRunningOnChainThread(void* chain);
void* ILibMemory_SmartReAllocate(void *ptr, size_t len);
void* ILibMemory_SmartAllocateEx_ResizeExtra(void *ptr, size_t extraSize);
void ILibMemory_SecureZero(void *ptr, size_t len);
void ILibMemory_Free(void *ptr);
void* ILibMemory_AllocateTemp(void* chain, size_t sz);

2
microstack/ILibWebRTC.c
View File

@@ -1141,7 +1141,7 @@ void ILibStun_OnDestroy(void *object)
ILibLinkedList_Destroy(obj->StunUsers);
if (obj->turnUsername != NULL) { free(obj->turnUsername); obj->turnUsername = NULL; }
if (obj->turnPassword != NULL) { memset(obj->turnPassword, 0, obj->turnPasswordLength); free(obj->turnPassword); obj->turnPassword = NULL; }
if (obj->turnPassword != NULL) { ILibMemory_SecureZero(obj->turnPassword, obj->turnPasswordLength); free(obj->turnPassword); obj->turnPassword = NULL; }
ILibLifeTime_Remove(obj->Timer, ILibWebRTC_STUN_TO_PERIODIC_CHECK_TIMER(obj));
if (extraClean == 0) return;