SetProcessMitigationPolicy function

Sets a mitigation policy for the calling process. Mitigation policies enable a process to harden itself against various types of attacks.

Syntax

BOOL SetProcessMitigationPolicy(
  PROCESS_MITIGATION_POLICY MitigationPolicy,
  PVOID                     lpBuffer,
  SIZE_T                    dwLength
);

Parameters

MitigationPolicy

The mitigation policy to apply. This parameter can be one of the following values.

Value Meaning
ProcessDEPPolicy
The data execution prevention (DEP) policy of the process.

The lpBuffer parameter points to a PROCESS_MITIGATION_DEP_POLICY structure that specifies the DEP policy flags.

ProcessASLRPolicy
The Address Space Layout Randomization (ASLR) policy of the process.

The lpBuffer parameter points to a PROCESS_MITIGATION_ASLR_POLICY structure that specifies the ASLR policy flags.

ProcessDynamicCodePolicy
The dynamic code policy of the process. When turned on, the process cannot generate dynamic code or modify existing executable code.

The lpBuffer parameter points to a PROCESS_MITIGATION_DYNAMIC_CODE_POLICY structure that specifies the dynamic code policy flags.

ProcessStrictHandleCheckPolicy
The process will receive a fatal error if it manipulates a handle that is not valid.

The lpBuffer parameter points to a PROCESS_MITIGATION_STRICT_HANDLE_CHECK_POLICY structure that specifies the handle check policy flags.

ProcessSystemCallDisablePolicy
Disables the ability to use NTUser/GDI functions at the lowest layer.

The lpBuffer parameter points to a PROCESS_MITIGATION_SYSTEM_CALL_DISABLE_POLICY structure that specifies the system call disable policy flags.

ProcessMitigationOptionsMask
Returns the mask of valid bits for all the mitigation options on the system. An application can set many mitigation options without querying the operating system for mitigation options by combining bitwise with the mask to exclude all non-supported bits at once.

The lpBuffer parameter points to a ULONG64 bit vector for the mask, or to accommodate more than 64 bits, a two-element array of ULONG64 bit vectors.

ProcessExtensionPointDisablePolicy
The lpBuffer parameter points to a PROCESS_MITIGATION_EXTENSION_POINT_DISABLE_POLICY structure that specifies the extension point disable policy flags.
ProcessControlFlowGuardPolicy
The Control Flow Guard (CFG) policy of the process.

The lpBuffer parameter points to a PROCESS_MITIGATION_CONTROL_FLOW_GUARD_POLICY structure that specifies the CFG policy flags.

Note  This value is not currently supported.
 
ProcessSignaturePolicy
The policy of a process that can restrict image loading to those images that are either signed by Microsoft, by the Windows Store, or by Microsoft, the Windows Store and the Windows Hardware Quality Labs (WHQL).

he lpBuffer parameter points to a PROCESS_MITIGATION_BINARY_SIGNATURE_POLICY structure that specifies the signature policy flags.

ProcessFontDisablePolicy
The policy regarding font loading for the process. When turned on, the process cannot load non-system fonts.

The lpBuffer parameter points to a PROCESS_MITIGATION_FONT_DISABLE_POLICY structure that specifies the policy flags for font loading.

ProcessImageLoadPolicy
The policy regarding image loading for the process, which determines the types of executable images that are allowed to be mapped into the process. When turned on, images cannot be loaded from some locations, such a remote devices or files that have the low mandatory label.

The lpBuffer parameter points to a PROCESS_MITIGATION_IMAGE_LOAD_POLICY structure that specifies the policy flags for image loading.

lpBuffer

If the MitigationPolicy parameter is ProcessDEPPolicy, this parameter points to a PROCESS_MITIGATION_DEP_POLICY structure that specifies the DEP policy flags.

If the MitigationPolicy parameter is ProcessASLRPolicy, this parameter points to a PROCESS_MITIGATION_ASLR_POLICY structure that specifies the ASLR policy flags.

If the MitigationPolicy parameter is ProcessImageLoadPolicy, this parameter points to a PROCESS_MITIGATION_IMAGE_LOAD_POLICY structure that receives the policy flags for image loading.

If the MitigationPolicy parameter is ProcessStrictHandleCheckPolicy, this parameter points to a PROCESS_MITIGATION_STRICT_HANDLE_CHECK_POLICY structure that specifies the handle check policy flags.

If the MitigationPolicy parameter is ProcessSystemCallDisablePolicy, this parameter points to a PROCESS_MITIGATION_SYSTEM_CALL_DISABLE_POLICY structure that specifies the system call disable policy flags.

If the MitigationPolicy parameter is ProcessMitigationOptionsMask, this parameter points to a ULONG64 bit vector for the mask, or to accommodate more than 64 bits, a two-element array of ULONG64 bit vectors.

If the MitigationPolicy parameter is ProcessExtensionPointDisablePolicy, this parameter points to a PROCESS_MITIGATION_EXTENSION_POINT_DISABLE_POLICY structure that specifies the extension point disable policy flags.

If the MitigationPolicy parameter is ProcessControlFlowGuardPolicy, this parameter points to a PROCESS_MITIGATION_CONTROL_FLOW_GUARD_POLICY structure that specifies the CFG policy flags.

If the MitigationPolicy parameter is ProcessSignaturePolicy, this parameter points to a PROCESS_MITIGATION_BINARY_SIGNATURE_POLICY structure that specifies the signature policy flags.

If the MitigationPolicy parameter is ProcessFontDisablePolicy, this parameter points to a PROCESS_MITIGATION_FONT_DISABLE_POLICY structure that specifies the policy flags for font loading.

If the MitigationPolicy parameter is ProcessImageLoadPolicy, this parameter points to a PROCESS_MITIGATION_IMAGE_LOAD_POLICY structure that specifies the policy flags for image loading.

dwLength

The size of lpBuffer, in bytes.

Return Value

If the function succeeds, it returns TRUE. If the function fails, it returns FALSE. To retrieve error values defined for this function, call GetLastError.

Remarks

Setting mitigation policy for a process helps prevent an attacker from exploiting security vulnerabilities. Use the SetProcessMitigationPolicy function to enable or disable security mitigation programmatically.

For maximum effectiveness, mitigation policies should be applied before or during process initialization. For example, setting the ASLR policy that enables forced relocation of images is effective only if it is applied before all of the images in a process have been loaded.

ASLR mitigation policies cannot be made less restrictive after they have been applied.

To compile an application that uses this function, set _WIN32_WINNT >= 0x0602. For more information, see Using the Windows Headers.

Requirements

   
Minimum supported client Windows 8 [desktop apps only]
Minimum supported server Windows Server 2012 [desktop apps only]
Target Platform Windows
Header processthreadsapi.h
Library Kernel32.lib
DLL Kernel32.dll