Security-177.tar.gz

[apple/security.git] / cdsa / cdsa_utilities / cssmalloc.cpp

diff --git a/cdsa/cdsa_utilities/cssmalloc.cpp b/cdsa/cdsa_utilities/cssmalloc.cpp
index 7994e803f2f0ab71f99e7a2c86bbc6a65080b937..036e401c3ed60b8772ebd820a6f8655e6013dd74 100644 (file)
--- a/cdsa/cdsa_utilities/cssmalloc.cpp
+++ b/cdsa/cdsa_utilities/cssmalloc.cpp
@@ -24,6 +24,7 @@
 #include <Security/cssmalloc.h>
 #include <Security/memutils.h>
 #include <Security/globalizer.h>
+#include <Security/trackingallocator.h>
 #include <stdlib.h>
 #include <errno.h>
 
@@ -31,11 +32,13 @@ using LowLevelMemoryUtilities::alignof;
 using LowLevelMemoryUtilities::increment;
 using LowLevelMemoryUtilities::alignUp;
 
+extern "C" size_t malloc_size(void *);
+
 
 //
 // Features of the CssmAllocator root class
 //
-bool CssmAllocator::operator == (const CssmAllocator &alloc) const
+bool CssmAllocator::operator == (const CssmAllocator &alloc) const throw()
 {
        return this == &alloc;
 }
@@ -52,38 +55,69 @@ CssmAllocator::~CssmAllocator()
 // pool). This is trivially achieved here by using singletons.
 //
 struct DefaultCssmAllocator : public CssmAllocator {
-       void *malloc(size_t size);
-       void free(void *addr);
-       void *realloc(void *addr, size_t size);
+       void *malloc(size_t size) throw(std::bad_alloc);
+       void free(void *addr) throw();
+       void *realloc(void *addr, size_t size) throw(std::bad_alloc);
+};
+
+struct SensitiveCssmAllocator : public DefaultCssmAllocator {
+    void free(void *addr) throw();
+    void *realloc(void *addr, size_t size) throw(std::bad_alloc);
+};
+
+struct DefaultAllocators {
+    DefaultCssmAllocator standard;
+    SensitiveCssmAllocator sensitive;
 };
 
-static ModuleNexus<DefaultCssmAllocator> defaultAllocator;
+static ModuleNexus<DefaultAllocators> defaultAllocators;
 
 
-CssmAllocator &CssmAllocator::standard(uint32)
+CssmAllocator &CssmAllocator::standard(uint32 request)
 {
-       return defaultAllocator();
+    switch (request) {
+    case normal:
+        return defaultAllocators().standard;
+    case sensitive:
+        return defaultAllocators().sensitive;
+    default:
+        CssmError::throwMe(CSSM_ERRCODE_MEMORY_ERROR);
+    }
 }
 
-void *DefaultCssmAllocator::malloc(size_t size)
+void *DefaultCssmAllocator::malloc(size_t size) throw(std::bad_alloc)
 {
        if (void *result = ::malloc(size))
                return result;
        throw std::bad_alloc();
 }
 
-void DefaultCssmAllocator::free(void *addr)
+void DefaultCssmAllocator::free(void *addr) throw()
 {
        ::free(addr);
 }
 
-void *DefaultCssmAllocator::realloc(void *addr, size_t newSize)
+void *DefaultCssmAllocator::realloc(void *addr, size_t newSize) throw(std::bad_alloc)
 {
        if (void *result = ::realloc(addr, newSize))
                return result;
        throw std::bad_alloc();
 }
 
+void SensitiveCssmAllocator::free(void *addr) throw()
+{
+    memset(addr, 0, malloc_size(addr));
+    DefaultCssmAllocator::free(addr);
+}
+
+void *SensitiveCssmAllocator::realloc(void *addr, size_t newSize) throw(std::bad_alloc)
+{
+    size_t oldSize = malloc_size(addr);
+    if (newSize < oldSize)
+        memset(increment(addr, newSize), 0, oldSize - newSize);
+    return DefaultCssmAllocator::realloc(addr, newSize);
+}
+
 TrackingAllocator::~TrackingAllocator()
 {
        AllocSet::iterator first = mAllocSet.begin(), last = mAllocSet.end();
@@ -94,13 +128,13 @@ TrackingAllocator::~TrackingAllocator()
 //
 // CssmMemoryFunctionsAllocators
 //
-void *CssmMemoryFunctionsAllocator::malloc(size_t size)
+void *CssmMemoryFunctionsAllocator::malloc(size_t size) throw(std::bad_alloc)
 { return functions.malloc(size); }
 
-void CssmMemoryFunctionsAllocator::free(void *addr)
+void CssmMemoryFunctionsAllocator::free(void *addr) throw()
 { return functions.free(addr); }
 
-void *CssmMemoryFunctionsAllocator::realloc(void *addr, size_t size)
+void *CssmMemoryFunctionsAllocator::realloc(void *addr, size_t size) throw(std::bad_alloc)
 { return functions.realloc(addr, size); }
 
 
@@ -116,16 +150,16 @@ CssmAllocatorMemoryFunctions::CssmAllocatorMemoryFunctions(CssmAllocator &alloc)
        calloc_func = relayCalloc;
 }
 
-void *CssmAllocatorMemoryFunctions::relayMalloc(size_t size, void *ref)
+void *CssmAllocatorMemoryFunctions::relayMalloc(size_t size, void *ref) throw(std::bad_alloc)
 { return allocator(ref).malloc(size); }
 
-void CssmAllocatorMemoryFunctions::relayFree(void *mem, void *ref)
+void CssmAllocatorMemoryFunctions::relayFree(void *mem, void *ref) throw()
 { allocator(ref).free(mem); }
 
-void *CssmAllocatorMemoryFunctions::relayRealloc(void *mem, size_t size, void *ref)
+void *CssmAllocatorMemoryFunctions::relayRealloc(void *mem, size_t size, void *ref) throw(std::bad_alloc)
 { return allocator(ref).realloc(mem, size); }
 
-void *CssmAllocatorMemoryFunctions::relayCalloc(uint32 count, size_t size, void *ref)
+void *CssmAllocatorMemoryFunctions::relayCalloc(uint32 count, size_t size, void *ref) throw(std::bad_alloc)
 {
        // CssmAllocator doesn't have a calloc() method
        void *mem = allocator(ref).malloc(size * count);
@@ -141,7 +175,7 @@ void *CssmAllocatorMemoryFunctions::relayCalloc(uint32 count, size_t size, void
 // functions to safely free our (hidden) pointer without knowing about it.
 // An allocator argument of NULL is interpreted as the standard allocator.
 //
-void *CssmHeap::operator new (size_t size, CssmAllocator *alloc)
+void *CssmHeap::operator new (size_t size, CssmAllocator *alloc) throw(std::bad_alloc)
 {
        if (alloc == NULL)
                alloc = &CssmAllocator::standard();
@@ -152,13 +186,18 @@ void *CssmHeap::operator new (size_t size, CssmAllocator *alloc)
        return addr;
 }
 
-void CssmHeap::operator delete (void *addr, size_t size, CssmAllocator *alloc)
+void CssmHeap::operator delete (void *addr, size_t size, CssmAllocator *alloc) throw()
 {
        alloc->free(addr);      // as per C++ std, called (only) if construction fails
 }
 
-void CssmHeap::operator delete (void *addr, size_t size)
+void CssmHeap::operator delete (void *addr, size_t size) throw()
 {
        void *end = increment(addr, alignUp(size, alignof<CssmAllocator *>()));
        (*(CssmAllocator **)end)->free(addr);
 }
+
+
+//
+// CssmVector
+//