C30029

Warning: Calling a memory allocating function which requests executable memory

This warning indicates that a function is being used that has been banned and has a more robust or secure replacement. This specific error indicates the use of an API that allocates only executable nonpaged pool.

Remarks

This should only be used if executable memory is required. See No-Execute (NX) Nonpaged Pool for more information on this. There are no parameters you can supply that will change this behavior. The only way to fix this issue is to use an alternative function that allows for allocation of non-executable nonpaged pool memory. A list of all banned functions covered by this error and the recommended replacements can be found after the following example.

Code analysis name: BANNED_MEM_ALLOCATION_NOTYPE

Example

The following code generates this warning. This issue stems from the use of MmMapIoSpace:

MmMapIoSpace(PhysicalAddress, numberOfBytes, MmNonCached);

The following code avoids this warning by replacing MmMapIoSpace with MmMapIoSpace:

MmMapIoSpaceEx(PhysicalAddress, numberOfBytes, PAGE_NOCACHE | PAGE_READWRITE);

Banned Functions

Banned API	Replacement(s)	Rationale / Notes
MmMapIoSpace()	MmMapIoSpaceEx()
MmAllocateContiguousMemorySpecifyCache()	MmAllocateContiguousNodeMemory()	Depending on the cache type, SpecifyCache can be used in a way that limits it to non-executable memory. However, using NodeMemory will ensure this. See C30030, subsection 'For defects involving cache types' for more information on this.