C++: Add extra cases to Allocation / Deallocation.

Author: geoffw0

cpp/ql/src/semmle/code/cpp/models/implementations/Allocation.qll

@@ -82,7 +82,9 @@ private class AllocaAllocationFunction extends AllocationFunction {
     hasGlobalName([
         // --- stack allocation
         "alloca", // // alloca(size)
-        "__builtin_alloca" // __builtin_alloca(size)
+        "__builtin_alloca", // __builtin_alloca(size)
+        "_alloca", // __alloca(size)
+        "_malloca" // _malloca(size)
       ]) and
     sizeArg = 0
   }

cpp/ql/src/semmle/code/cpp/models/implementations/Strdup.qll

@@ -14,11 +14,14 @@ import semmle.code.cpp.models.interfaces.Taint
 private class StrdupFunction extends AllocationFunction, ArrayFunction, DataFlowFunction {
   StrdupFunction() {
     hasGlobalName([
+        // --- C library allocation
         "strdup", // strdup(str)
         "wcsdup", // wcsdup(str)
         "_strdup", // _strdup(str)
         "_wcsdup", // _wcsdup(str)
-        "_mbsdup" // _mbsdup(str)
+        "_mbsdup", // _mbsdup(str)
+        // --- Windows Automation
+        "SysAllocString" // SysAllocString(string)
       ])
   }
 
@@ -39,8 +42,8 @@ private class StrndupFunction extends AllocationFunction, ArrayFunction, DataFlo
   StrndupFunction() {
     exists(string name |
       hasGlobalName(name) and
-      // strndup(str, maxlen)
-      name = "strndup"
+      // --- C library allocation
+      name = "strndup" // strndup(str, maxlen)
     )
   }