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|
/*++
Copyright (c) 2024 Microsoft Corporation All Rights Reserved
Module Name:
agent.c
Abstract:
Usermode agent that interacts with the kasantrigger.sys driver to
demonstrate how KASAN detects illegal memory accesses.
Environment:
Win32 console multi-threaded application.
--*/
#include <windows.h>
#include <winioctl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strsafe.h>
#include <sys\kasantrigger.h>
VOID __cdecl
main(
_In_ ULONG argc,
_In_reads_(argc) PCHAR argv[]
)
{
ULONG bytesReturned;
INT choice;
HANDLE hDevice;
ULONG index;
DWORD ioctlCode;
BOOLEAN isKasanEnabledOnDriver;
BOOL success;
UCHAR value;
UNREFERENCED_PARAMETER(argc);
UNREFERENCED_PARAMETER(argv);
printf(
" _ __ ______ \n"
"| | / / | _ \\ \n"
"| |/ / __ _ ___ __ _ _ __ | | | |___ _ __ ___ ___ \n"
"| \\ / _` / __|/ _` | '_ \\ | | | / _ \\ '_ ` _ \\ / _ \\ \n"
"| |\\ \\ (_| \\__ \\ (_| | | | | | |/ / __/ | | | | | (_) |\n"
"\\_| \\_/\\__,_|___/\\__,_|_| |_| |___/ \\___|_| |_| |_|\\___/ \n\n"
);
//
// Open the device.
//
hDevice = CreateFile("\\\\.\\KasanTrigger",
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL,
NULL);
if (hDevice == INVALID_HANDLE_VALUE) {
printf("CreateFile failed: %d. Did you forget to load kasantrigger.sys?\n",
GetLastError());
return;
}
//
// Check whether KASAN is enabled on the driver.
//
success = DeviceIoControl(hDevice,
(DWORD)IOCTL_KASANTRIGGER_INFO,
NULL,
0,
&isKasanEnabledOnDriver,
sizeof(isKasanEnabledOnDriver),
&bytesReturned,
NULL);
if (!success) {
printf("DeviceIoControl failed: %d\n\n", GetLastError());
return;
}
if (!isKasanEnabledOnDriver) {
printf("WARNING: KASAN is not enabled on kasantrigger.sys\n\n");
}
printf("Enter a number in the menu below to trigger the desired condition:\n");
printf("1. Trigger a stack out-of-bounds read\n");
printf("2. Trigger a global out-of-bounds read\n");
printf("3. Trigger a heap out-of-bounds read\n\n");
while (TRUE) {
printf("> ");
while ((choice = getchar()) == '\n');
switch (choice) {
case '1':
ioctlCode = (DWORD)IOCTL_KASANTRIGGER_OOBR_STACK;
break;
case '2':
ioctlCode = (DWORD)IOCTL_KASANTRIGGER_OOBR_GLOBAL;
break;
case '3':
ioctlCode = (DWORD)IOCTL_KASANTRIGGER_OOBR_HEAP;
break;
default:
printf("Incorrect input, try again\n");
continue;
}
printf("You have selected %c. Excellent choice. ", choice);
Sleep(1000);
printf("Triggering in 3...");
Sleep(1000);
printf(" 2...");
Sleep(1000);
printf(" 1...");
Sleep(1000);
printf("\n");
index = KASANTRIGGER_ARRAY_SIZE;
value = 0;
success = DeviceIoControl(hDevice,
ioctlCode,
&index,
sizeof(index),
&value,
sizeof(value),
&bytesReturned,
NULL);
if (!success) {
printf("DeviceIoControl failed: %d\n", GetLastError());
return;
}
//
// KASAN should have normally triggered a bugcheck, so this should be
// unreachable.
//
if (isKasanEnabledOnDriver) {
printf("Still alive. The bugcheck was not issued. This is not expected.\n");
} else {
printf("Still alive, because KASAN was not enabled on the driver. The illegal access went undetected.\n");
}
}
CloseHandle(hDevice);
}
|
