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NtAllocateUuids(): Improve randomness of initial sequence count.

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svn path=/trunk/; revision=12251
This commit is contained in:
Eric Kohl 2004-12-20 14:07:34 +00:00
parent e49daf9671
commit c443a93492
1 changed files with 16 additions and 4 deletions
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20
reactos/ntoskrnl/ex/uuid.c
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@ -1,4 +1,4 @@
/* $Id: uuid.c,v 1.3 2004/12/19 12:52:42 ekohl Exp $ /* $Id: uuid.c,v 1.4 2004/12/20 14:07:34 ekohl Exp $
* *
* COPYRIGHT: See COPYING in the top level directory * COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel * PROJECT: ReactOS kernel
@ -152,8 +152,16 @@ ExpSaveUuidSequence(PULONG Sequence)
static VOID static VOID
ExpGetRandomUuidSequence(PULONG Sequence) ExpGetRandomUuidSequence(PULONG Sequence)
{ {
/* FIXME */ LARGE_INTEGER Counter;
*Sequence = 0x70615243; LARGE_INTEGER Frequency;
ULONG Value;
Counter = KeQueryPerformanceCounter(&Frequency);
Value = Counter.u.LowPart ^ Counter.u.HighPart;
*Sequence = *Sequence ^ Value;
DPRINT("Sequence %lx\n", *Sequence);
} }
@ -219,7 +227,11 @@ NtAllocateUuids(OUT PULARGE_INTEGER Time,
if (!UuidSequenceInitialized) if (!UuidSequenceInitialized)
{ {
Status = ExpLoadUuidSequence(&UuidSequence); Status = ExpLoadUuidSequence(&UuidSequence);
if (!NT_SUCCESS(Status)) if (NT_SUCCESS(Status))
{
UuidSequence++;
}
else
{ {
ExpGetRandomUuidSequence(&UuidSequence); ExpGetRandomUuidSequence(&UuidSequence);
} }