#include "alert_exceptions.h"
#include "crc32.h"
#include "guests.h"
#include "utils.h"

Functions
static DWORD	IntAlertGetHashForLinuxName (const WCHAR *Originator, const size_t MaxLength)
	Compute the crc32-hash for the provided string. More...

static DWORD	IntAlertGetHashForWindowsName (const WCHAR *Originator, const size_t MaxLength)
	Compute the crc32-hash for the provided string. More...

static DWORD	IntAlertGetHashForName (const WCHAR *Originator, BOOLEAN LinuxGuest, BOOLEAN KernelMode, size_t MaxLength)
	Compute the crc32-hash for the provided string. More...

static DWORD	IntAlertGetEptExceptionFlags (const EVENT_EPT_VIOLATION *Event)
	Get the flags for an exception based on the information from the provided event. More...

static void	IntAlertCreateCbSignature (const INTRO_CODEBLOCKS CodeBlocks, BOOLEAN LinuxAlert, BOOLEAN ExecAlert, ALERT_CB_SIGNATURE Signature)
	Creates an alert-signature structure. More...

static void	IntAlertCreateProcessCreationSignature (DWORD PcType, BOOLEAN LinuxAlert, ALERT_PROCESS_CREATION_SIGNATURE *Signature)
	Creates a process-creation alert-signature structure. More...

static void	IntAlertCreateIdtSignature (const BYTE Entry, BOOLEAN LinuxAlert, ALERT_IDT_SIGNATURE *Signature)
	Creates a IDT alert-signature structure. More...

static void	IntAlertCreateExportSignature (const INTRO_MODULE Module, const char FunctionName, DWORD FunctionNameHash, DWORD Delta, DWORD WriteSize, BOOLEAN LinuxEvent, ALERT_EXPORT_SIGNATURE *Signature)
	Creates an export alert-signature structure. More...

static INTSTATUS	IntAlertCreateEptException (const EVENT_EPT_VIOLATION Event, BOOLEAN LogErrors, void Exception)
	Creates an alert-exception structure from an EPT violation event. More...

static INTSTATUS	IntAlertCreateMsrException (const EVENT_MSR_VIOLATION Event, BOOLEAN LogErrors, void Exception)
	Creates an alert-exception structure from an MSR violation event. More...

static INTSTATUS	IntAlertCreateCrException (const EVENT_CR_VIOLATION Event, BOOLEAN LogErrors, void Exception)
	Creates an alert-exception structure from an CR violation event. More...

static INTSTATUS	IntAlertCreateInjectionException (const EVENT_MEMCOPY_VIOLATION Event, BOOLEAN LogErrors, void Exception)
	Creates an alert-exception structure from an Injection violation event. More...

static INTSTATUS	IntAlertCreateProcessCreationException (const EVENT_PROCESS_CREATION_VIOLATION Event, BOOLEAN LogErrors, void Exception)
	Creates an alert-exception structure from an process-creation violation event. More...

static INTSTATUS	IntAlertCreateModuleLoadException (const EVENT_MODULE_LOAD_VIOLATION Event, BOOLEAN LogErrors, void Exception)
	Creates an alert-exception structure from an module-load violation event. More...

static INTSTATUS	IntAlertCreateIntegrityException (const EVENT_INTEGRITY_VIOLATION Event, BOOLEAN LogErrors, void Exception)
	Creates an alert-exception structure from an integrity violation event. More...

static INTSTATUS	IntAlertCreateDtrException (const EVENT_DTR_VIOLATION Event, BOOLEAN LogErrors, void Exception)
	Creates an alert-exception structure from an process-creation violation event. More...

INTSTATUS	IntAlertCreateException (const void Event, INTRO_EVENT_TYPE Type, BOOLEAN LogErrors, void Exception)
	This function will dispatch the exception creation to the appropriate function, depending on the event type. More...

INTSTATUS	IntAlertCreateExceptionInEvent (void *Event, INTRO_EVENT_TYPE Type)
	This function creates an alert-exception for each alert sent to the integrator. More...

Function Documentation

◆ IntAlertCreateCbSignature()

static void IntAlertCreateCbSignature	(	const INTRO_CODEBLOCKS *	CodeBlocks,
		BOOLEAN	LinuxAlert,
		BOOLEAN	ExecAlert,
		ALERT_CB_SIGNATURE *	Signature
	)

static

Creates an alert-signature structure.

For each alert-structure is assigned an internal version that is incremented for every change in the structure that breaks the backwards-compatibility. If the alert was not generated from an execution violation the codeblocks in the alert-signature are taken around the rip-index codeblock.

Parameters

[in]	CodeBlocks	Array of actual code block patterns.
[in]	LinuxAlert	True if the signature is used for a Linux guest.
[in]	ExecAlert	True if the alert was generated for an execution violation.
[out]	Signature	The newly created alert signature structure.

Definition at line 204 of file alert_exceptions.c.

Referenced by IntAlertCreateCrException(), IntAlertCreateDtrException(), IntAlertCreateEptException(), and IntAlertCreateMsrException().

◆ IntAlertCreateCrException()

static INTSTATUS IntAlertCreateCrException	(	const EVENT_CR_VIOLATION *	Event,
		BOOLEAN	LogErrors,
		void *	Exception
	)

static

Creates an alert-exception structure from an CR violation event.

For each alert-exception is assigned an internal version that is incremented for every change in the structure that breaks the backwards-compatibility. This function also creates codeblocks (if any) signatures that is assigned to the exception.

Parameters

[in]	Event	The event structure for CR violation.
[in]	LogErrors	True if the function should log errors, otherwise false.
[out]	Exception	A raw buffer to store the alert-exception.

Return values

INT_STATUS_SUCCESS On success.

Definition at line 868 of file alert_exceptions.c.

Referenced by IntAlertCreateException().

◆ IntAlertCreateDtrException()

static INTSTATUS IntAlertCreateDtrException	(	const EVENT_DTR_VIOLATION *	Event,
		BOOLEAN	LogErrors,
		void *	Exception
	)

static

Creates an alert-exception structure from an process-creation violation event.

For each alert-exception is assigned an internal version that is incremented for every change in the structure that breaks the backwards-compatibility. This function also creates code-blocks (if any) signatures that is assigned to the exception.

Parameters

[in]	Event	The event structure for process-creation violation.
[in]	LogErrors	True if the function should log errors, otherwise false.
[out]	Exception	A raw buffer to store the alert-exception.

Return values

INT_STATUS_SUCCESS	On success.
INT_STATUS_NOT_SUPPORTED	If the victim type is not kmObjIdtr or kmObjGdtr.

Definition at line 1353 of file alert_exceptions.c.

Referenced by IntAlertCreateException().

◆ IntAlertCreateEptException()

static INTSTATUS IntAlertCreateEptException	(	const EVENT_EPT_VIOLATION *	Event,
		BOOLEAN	LogErrors,
		void *	Exception
	)

static

Creates an alert-exception structure from an EPT violation event.

For each alert-exception is assigned an internal version that is incremented for every change in the structure that breaks the backwards-compatibility. This function creates a user-mode or kernel-mode alert-exception based on the event flags; if the ALERT_FLAG_NOT_RING0 is set, an user-mode alert-exception the function creates an user-mode exception, otherwise an kernel-mode alert-exception is created. The flags, originator, victim, type fields of the alert-exception are extracted from the event. This function also creates code blocks and/or IDT signatures that is assigned to the exception.

Parameters

[in]	Event	The event structure for EPT violation.
[in]	LogErrors	True if the function should log errors, otherwise false.
[out]	Exception	A raw buffer to store the alert-exception.

Return values

INT_STATUS_SUCCESS	On success.
INT_STATUS_NOT_SUPPORTED	If the information about the violation is invalid or incomplete.

Definition at line 428 of file alert_exceptions.c.

Referenced by IntAlertCreateException().

◆ IntAlertCreateException()

INTSTATUS IntAlertCreateException	(	const void *	Event,
		INTRO_EVENT_TYPE	Type,
		BOOLEAN	LogErrors,
		void *	Exception
	)

This function will dispatch the exception creation to the appropriate function, depending on the event type.

Parameters

[in]	Event	The event structure for process-creation violation.
[in]	Type	The type of the event.
[in]	LogErrors	True if the function should log errors, otherwise False.
[in,out]	Exception	A raw buffer to store the alert-exception.

Return values

INT_STATUS_SUCCESS	On success.
INT_STATUS_NOT_SUPPORTED	If the provided type is not supported.

Definition at line 1430 of file alert_exceptions.c.

Referenced by IntAlertCreateExceptionInEvent(), and IntUpdateAddExceptionFromAlert().

◆ IntAlertCreateExceptionInEvent()

INTSTATUS IntAlertCreateExceptionInEvent	(	void *	Event,
		INTRO_EVENT_TYPE	Type
	)

This function creates an alert-exception for each alert sent to the integrator.

Parameters

[in]	Event	The event structure for process-creation violation.
[in]	Type	The type of the event.

Return values

INT_STATUS_SUCCESS	On success.
INT_STATUS_NOT_SUPPORTED	If the provided type is not supported.

Definition at line 1513 of file alert_exceptions.c.

Referenced by IntNotifyIntroEvent().

◆ IntAlertCreateExportSignature()

static void IntAlertCreateExportSignature	(	const INTRO_MODULE *	Module,
		const char *	FunctionName,
		DWORD	FunctionNameHash,
		DWORD	Delta,
		DWORD	WriteSize,
		BOOLEAN	LinuxEvent,
		ALERT_EXPORT_SIGNATURE *	Signature
	)

static

Creates an export alert-signature structure.

For each alert-structure is assigned an internal version that is incremented for every change in the structure that breaks the backwards-compatibility. If the function name is missing the kmExcNameAny is used as a function name.

Parameters

[in]	Module	A user-mode or kernel-mode module
[in]	FunctionName	The function name from the provided module.
[in]	FunctionNameHash	The function name hash of the provided function.
[in]	Delta	The number of bytes that are modified from the beginning of the write.
[in]	WriteSize	The number of bytes that are modified.
[in]	LinuxEvent	True if the signature is used for a Linux guest.
[out]	Signature	The newly created alert signature structure.

Definition at line 365 of file alert_exceptions.c.

Referenced by IntAlertCreateInjectionException().

◆ IntAlertCreateIdtSignature()

static void IntAlertCreateIdtSignature	(	const BYTE	Entry,
		BOOLEAN	LinuxAlert,
		ALERT_IDT_SIGNATURE *	Signature
	)

static

Creates a IDT alert-signature structure.

For each alert-structure is assigned an internal version that is incremented for every change in the structure that breaks the backwards-compatibility.

Parameters

[in]	Entry	The entry number of the IDT entry.
[in]	LinuxAlert	True if the signature is used for a Linux guest.
[out]	Signature	The newly created alert signature structure.

Definition at line 334 of file alert_exceptions.c.

Referenced by IntAlertCreateEptException(), and IntAlertCreateIntegrityException().

◆ IntAlertCreateInjectionException()

static INTSTATUS IntAlertCreateInjectionException	(	const EVENT_MEMCOPY_VIOLATION *	Event,
		BOOLEAN	LogErrors,
		void *	Exception
	)

static

Creates an alert-exception structure from an Injection violation event.

For each alert-exception is assigned an internal version that is incremented for every change in the structure that breaks the backwards-compatibility. This function also creates export (if any) signatures that is assigned to the exception.

Parameters

[in]	Event	The event structure for MSR violation.
[in]	LogErrors	True if the function should log errors, otherwise false.
[out]	Exception	A raw buffer to store the alert-exception.

Return values

INT_STATUS_SUCCESS	On success.
INT_STATUS_NOT_SUPPORTED	If the originator/victim is invalid.

Definition at line 930 of file alert_exceptions.c.

Referenced by IntAlertCreateException().

◆ IntAlertCreateIntegrityException()

static INTSTATUS IntAlertCreateIntegrityException	(	const EVENT_INTEGRITY_VIOLATION *	Event,
		BOOLEAN	LogErrors,
		void *	Exception
	)

static

Creates an alert-exception structure from an integrity violation event.

For each alert-exception is assigned an internal version that is incremented for every change in the structure that breaks the backwards-compatibility.

Parameters

[in]	Event	The event structure for integrity violation.
[in]	LogErrors	True if the function should log errors, otherwise false.
[out]	Exception	A raw buffer to store the alert-exception.

Return values

INT_STATUS_SUCCESS	On success.
INT_STATUS_NOT_SUPPORTED	If the current guest operating system is Linux.

Definition at line 1179 of file alert_exceptions.c.

Referenced by IntAlertCreateException().

◆ IntAlertCreateModuleLoadException()

static INTSTATUS IntAlertCreateModuleLoadException	(	const EVENT_MODULE_LOAD_VIOLATION *	Event,
		BOOLEAN	LogErrors,
		void *	Exception
	)

static

Creates an alert-exception structure from an module-load violation event.

For each alert-exception is assigned an internal version that is incremented for every change in the structure that breaks the backwards-compatibility.

Parameters

[in]	Event	The event structure for module-load violation.
[in]	LogErrors	True if the function should log errors, otherwise false.
[out]	Exception	A raw buffer to store the alert-exception.

Return values

INT_STATUS_SUCCESS	On success.
INT_STATUS_NOT_SUPPORTED	If the originator/victim is invalid.

Definition at line 1108 of file alert_exceptions.c.

Referenced by IntAlertCreateException().

◆ IntAlertCreateMsrException()

static INTSTATUS IntAlertCreateMsrException	(	const EVENT_MSR_VIOLATION *	Event,
		BOOLEAN	LogErrors,
		void *	Exception
	)

static

Creates an alert-exception structure from an MSR violation event.

For each alert-exception is assigned an internal version that is incremented for every change in the structure that breaks the backwards-compatibility. This function also creates codeblocks (if any) signatures that is assigned to the exception.

Parameters

[in]	Event	The event structure for MSR violation.
[in]	LogErrors	True if the function should log errors, otherwise false.
[out]	Exception	A raw buffer to store the alert-exception.

Return values

INT_STATUS_SUCCESS On success.

Definition at line 807 of file alert_exceptions.c.

Referenced by IntAlertCreateException().

◆ IntAlertCreateProcessCreationException()

static INTSTATUS IntAlertCreateProcessCreationException	(	const EVENT_PROCESS_CREATION_VIOLATION *	Event,
		BOOLEAN	LogErrors,
		void *	Exception
	)

static

Creates an alert-exception structure from an process-creation violation event.

For each alert-exception is assigned an internal version that is incremented for every change in the structure that breaks the backwards-compatibility. This function also creates process-creation (if any) signatures that is assigned to the exception.

Parameters

[in]	Event	The event structure for process-creation violation.
[in]	LogErrors	True if the function should log errors, otherwise false.
[out]	Exception	A raw buffer to store the alert-exception.

Return values

INT_STATUS_SUCCESS	On success.
INT_STATUS_NOT_SUPPORTED	If the originator/victim is invalid.

Definition at line 1034 of file alert_exceptions.c.

Referenced by IntAlertCreateException().

◆ IntAlertCreateProcessCreationSignature()

static void IntAlertCreateProcessCreationSignature	(	DWORD	PcType,
		BOOLEAN	LinuxAlert,
		ALERT_PROCESS_CREATION_SIGNATURE *	Signature
	)

static

Creates a process-creation alert-signature structure.

For each alert-structure is assigned an internal version that is incremented for every change in the structure that breaks the backwards-compatibility.

Parameters

[in]	PcType	The process creation violation type.
[in]	LinuxAlert	True if the signature is used for a Linux guest.
[out]	Signature	The newly created alert signature structure.

Definition at line 303 of file alert_exceptions.c.

Referenced by IntAlertCreateProcessCreationException().

◆ IntAlertGetEptExceptionFlags()

static DWORD IntAlertGetEptExceptionFlags ( const EVENT_EPT_VIOLATION * Event )

static

Get the flags for an exception based on the information from the provided event.

This function always set the 32 and the 64 bits process/system flag; if the event was generated by a linux guest, the exception flag for linux is set; the execute/read/write flags is set according to the event violation type.

Parameters

[in] Event The event structure provided by the integrator.

Return values

The	flags generated based on the information from the provided event.

Definition at line 165 of file alert_exceptions.c.

Referenced by IntAlertCreateEptException().

◆ IntAlertGetHashForLinuxName()

static DWORD IntAlertGetHashForLinuxName	(	const WCHAR *	Originator,
		const size_t	MaxLength
	)

static

Compute the crc32-hash for the provided string.

The crc32-hash is not computed in the following cases:

if the provided string is the kernel name of the guest operation system the function returns kmExcNameKernel

Parameters

[in]	Originator	The string for witch the crc32-hash must be computed.
[in]	MaxLength	The maximum length of the given buffer.

Return values

The	value of the crc32-hash of the provided string.

Definition at line 17 of file alert_exceptions.c.

Referenced by IntAlertGetHashForName().

◆ IntAlertGetHashForName()

static DWORD IntAlertGetHashForName	(	const WCHAR *	Originator,
		BOOLEAN	LinuxGuest,
		BOOLEAN	KernelMode,
		size_t	MaxLength
	)

static

Compute the crc32-hash for the provided string.

If the provided string is missing the kmExcNameNone/umExcNameNone is returned. The function dispatch the crc32-hash compute to the appropriate function, depending on the operating system.

Parameters

[in]	Originator	The string for witch the crc32-hash must be computed.
[in]	LinuxGuest	True if the provided string is used for a Linux guest, otherwise false.
[in]	KernelMode	True if the provided string is used for kernel-mode, otherwise false.
[in]	MaxLength	The maximum length of the given Originator buffer.

Return values

The	value of the crc32-hash of the provided string.

Definition at line 121 of file alert_exceptions.c.

Referenced by IntAlertCreateCrException(), IntAlertCreateDtrException(), IntAlertCreateEptException(), IntAlertCreateExportSignature(), IntAlertCreateIntegrityException(), IntAlertCreateModuleLoadException(), and IntAlertCreateMsrException().

◆ IntAlertGetHashForWindowsName()

static DWORD IntAlertGetHashForWindowsName	(	const WCHAR *	Originator,
		const size_t	MaxLength
	)

static

Compute the crc32-hash for the provided string.

The function parse the provided string (the string is a path) and extracts only the file name; the crc32-hash is computed only for the extracted file name. The crc32-hash is not computed in the following cases:

if the provided string is the kernel name of the guest operation system the function returns kmExcNameKernel
if the provided string is the hal name of the guest operation system the function returns kmExcNameHal

Parameters

[in]	Originator	The string for witch the crc32-hash must be computed.
[in]	MaxLength	The maximum length of the buffer.

Return values

The	value of the crc32-hash of the provided string.

Definition at line 54 of file alert_exceptions.c.

Referenced by IntAlertGetHashForName().

Functions

Function Documentation

◆ IntAlertCreateCbSignature()

◆ IntAlertCreateCrException()

◆ IntAlertCreateDtrException()

◆ IntAlertCreateEptException()

◆ IntAlertCreateException()

◆ IntAlertCreateExceptionInEvent()

◆ IntAlertCreateExportSignature()

◆ IntAlertCreateIdtSignature()

◆ IntAlertCreateInjectionException()

◆ IntAlertCreateIntegrityException()

◆ IntAlertCreateModuleLoadException()

◆ IntAlertCreateMsrException()

◆ IntAlertCreateProcessCreationException()

◆ IntAlertCreateProcessCreationSignature()

◆ IntAlertGetEptExceptionFlags()

◆ IntAlertGetHashForLinuxName()

◆ IntAlertGetHashForName()

◆ IntAlertGetHashForWindowsName()