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Windows Driver: Add registry settings to control driver internal encryption queue Under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\veracrypt: - VeraCryptEncryptionFragmentSize (REG_DWORD): size of encryption data fragment in KiB. Default is 256. - VeraCryptEncryptionIoRequestCount (REG_DWORD): maximum number of parallel I/O requests. Default is 16. - VeraCryptEncryptionItemCount (REG_DWORD): maximum number of encryption queue items processed in parallel. Default is 8.

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This commit is contained in:
Mounir IDRASSI
2021-12-20 00:14:24 +01:00
parent 4ed2bf5427
commit 5640de3584
5 changed files with 134 additions and 19 deletions
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47
src/Driver/Ntdriver.c
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@@ -148,6 +148,9 @@ static KeAreAllApcsDisabledFn KeAreAllApcsDisabledPtr = NULL;
static KeSetSystemGroupAffinityThreadFn KeSetSystemGroupAffinityThreadPtr = NULL;
static KeQueryActiveGroupCountFn KeQueryActiveGroupCountPtr = NULL;
static KeQueryActiveProcessorCountExFn KeQueryActiveProcessorCountExPtr = NULL;
int EncryptionIoRequestCount = 0;
int EncryptionItemCount = 0;
int EncryptionFragmentSize = 0;
POOL_TYPE ExDefaultNonPagedPoolType = NonPagedPool;
ULONG ExDefaultMdlProtection = 0;
@@ -4795,6 +4798,50 @@ NTSTATUS ReadRegistryConfigFlags (BOOL driverEntry)
TCfree (data);
}
if (driverEntry && NT_SUCCESS (TCReadRegistryKey (&name, VC_ENCRYPTION_IO_REQUEST_COUNT, &data)))
{
if (data->Type == REG_DWORD)
EncryptionIoRequestCount = *(uint32 *) data->Data;
TCfree (data);
}
if (driverEntry && NT_SUCCESS (TCReadRegistryKey (&name, VC_ENCRYPTION_ITEM_COUNT, &data)))
{
if (data->Type == REG_DWORD)
EncryptionItemCount = *(uint32 *) data->Data;
TCfree (data);
}
if (driverEntry && NT_SUCCESS (TCReadRegistryKey (&name, VC_ENCRYPTION_FRAGMENT_SIZE, &data)))
{
if (data->Type == REG_DWORD)
EncryptionFragmentSize = *(uint32 *) data->Data;
TCfree (data);
}
if (driverEntry)
{
if (EncryptionIoRequestCount < TC_ENC_IO_QUEUE_PREALLOCATED_IO_REQUEST_COUNT)
EncryptionIoRequestCount = TC_ENC_IO_QUEUE_PREALLOCATED_IO_REQUEST_COUNT;
if (EncryptionItemCount == 0)
EncryptionItemCount = EncryptionIoRequestCount / 2;
else if (EncryptionItemCount >= EncryptionIoRequestCount)
EncryptionItemCount = EncryptionIoRequestCount - 1;
/* EncryptionFragmentSize value in registry is expressed in KiB */
if (EncryptionFragmentSize == 0)
EncryptionFragmentSize = TC_ENC_IO_QUEUE_MAX_FRAGMENT_SIZE / 1024;
else if (EncryptionFragmentSize > (8 * TC_ENC_IO_QUEUE_MAX_FRAGMENT_SIZE / 1024))
EncryptionFragmentSize = 8 * TC_ENC_IO_QUEUE_MAX_FRAGMENT_SIZE / 1024;
EncryptionFragmentSize = EncryptionFragmentSize * 1024;
}
return status;
}