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Windows driver: add extra check for data read in TC_IOCTL_OPEN_TEST handling

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This commit is contained in:
Mounir IDRASSI 2018-09-20 09:50:45 +02:00
parent f30f9339c9
commit 2455c03e0d
No known key found for this signature in database
GPG Key ID: DD0C382D5FCFB8FC
1 changed files with 31 additions and 1 deletions
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32
src/Driver/Ntdriver.c
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@ -289,6 +289,23 @@ BOOL IsAllZeroes (unsigned char* pbData, DWORD dwDataLen)
return TRUE;
}
static BOOL StringNoCaseCompare (const wchar_t* str1, const wchar_t* str2, size_t len)
{
if (str1 && str2)
{
while (len)
{
if (RtlUpcaseUnicodeChar (*str1) != RtlUpcaseUnicodeChar (*str2))
return FALSE;
str1++;
str2++;
len--;
}
}
return TRUE;
}
BOOL ValidateIOBufferSize (PIRP irp, size_t requiredBufferSize, ValidateIOBufferSizeType type)
{
PIO_STACK_LOCATION irpSp = IoGetCurrentIrpStackLocation (irp);
@ -1745,10 +1762,23 @@ NTSTATUS ProcessMainDeviceControlIrp (PDEVICE_OBJECT DeviceObject, PEXTENSION Ex
IO_STATUS_BLOCK IoStatus;
LARGE_INTEGER offset;
ACCESS_MASK access = FILE_READ_ATTRIBUTES;
size_t devicePathLen = 0;
if (!ValidateIOBufferSize (Irp, sizeof (OPEN_TEST_STRUCT), ValidateInputOutput))
break;
// check that opentest->wszFileName is a device path that starts with "\\Device\\Harddisk"
if ( !NT_SUCCESS (RtlUnalignedStringCchLengthW (opentest->wszFileName, TC_MAX_PATH, &devicePathLen))
|| (devicePathLen < 16) // 16 is the length of "\\Device\\Harddisk" which is the minimum
|| (!StringNoCaseCompare (opentest->wszFileName, L"\\Device\\Harddisk", 16))
)
{
Irp->IoStatus.Status = STATUS_INVALID_PARAMETER;
Irp->IoStatus.Information = 0;
break;
}
EnsureNullTerminatedString (opentest->wszFileName, sizeof (opentest->wszFileName));
RtlInitUnicodeString (&FullFileName, opentest->wszFileName);
@ -1866,7 +1896,7 @@ NTSTATUS ProcessMainDeviceControlIrp (PDEVICE_OBJECT DeviceObject, PEXTENSION Ex
&offset,
NULL);
if (NT_SUCCESS (ntStatus))
if (NT_SUCCESS (ntStatus) && (IoStatus.Information >= TC_VOLUME_HEADER_EFFECTIVE_SIZE))
{
/* compute the ID of this volume: SHA-256 of the effective header */
sha256 (opentest->volumeIDs[volumeType], readBuffer, TC_VOLUME_HEADER_EFFECTIVE_SIZE);