On Nov 13 16:32, Ozkan Sezer wrote:
> On Mon, Nov 12, 2012 at 7:37 PM, Corinna Vinschen <[email protected]> wrote:
>
> About the correction made in SYSTEM_BASIC_INFORMATION:
>
> [...]
> > Index: winternl.h
> > ===================================================================
> > --- winternl.h (revision 5451)
> > +++ winternl.h (working copy)
> > @@ -688,9 +688,9 @@
> > ULONG LowestPhysicalPage;
> > ULONG HighestPhysicalPage;
> > ULONG AllocationGranularity;
> > - ULONG LowestUserAddress;
> > - ULONG HighestUserAddress;
> > - ULONG ActiveProcessors;
> > + ULONG_PTR LowestUserAddress;
> > + ULONG_PTR HighestUserAddress;
> > + ULONG_PTR ActiveProcessors;
> > CCHAR NumberOfProcessors;
> > } SYSTEM_BASIC_INFORMATION,*PSYSTEM_BASIC_INFORMATION;
>
> If we compare original structure, we have:
>
> BYTE Reserved1[24];
> PVOID Reserved2[4];
> CCHAR NumberOfProcessors;
>
> So, PVOID Reserved2[4] should correspond to 4 ULONG_PTR members
> in the detailed version: do we not need the following, too?
>
> - ULONG AllocationGranularity;
> + ULONG_PTR AllocationGranularity;
No, the AllocationGranularity is a ULONG value. The size of the
structure is a result of the automatic 8 byte alignment of 8 byte types.
Try this:
=== SNIP ===
#include <stdio.h>
#include <string.h>
#include <windows.h>
#ifndef NT_SUCCESS
#define NT_SUCCESS(status) ((NTSTATUS) (status) >= 0)
#endif
typedef int NTSTATUS;
typedef struct _SYSTEM_BASIC_INFORMATION
{
ULONG Unknown;
ULONG MaximumIncrement;
ULONG PhysicalPageSize;
ULONG NumberOfPhysicalPages;
ULONG LowestPhysicalPage;
ULONG HighestPhysicalPage;
ULONG AllocationGranularity;
#ifdef _WIN64
ULONG dummy1;
#endif
ULONG_PTR LowestUserAddress;
ULONG_PTR HighestUserAddress;
ULONG_PTR ActiveProcessors;
UCHAR NumberProcessors;
} SYSTEM_BASIC_INFORMATION, *PSYSTEM_BASIC_INFORMATION;
NTSTATUS NTAPI NtQuerySystemInformation (ULONG, PVOID, ULONG, PULONG);
int
main ()
{
NTSTATUS status;
ULONG i, size;
SYSTEM_BASIC_INFORMATION sbi;
memset (&sbi, 0xbf, sizeof sbi);
status = NtQuerySystemInformation (0, &sbi, sizeof sbi, &size);
if (!NT_SUCCESS (status))
{
fprintf (stderr, "NtQuerySystemInformation: 0x%lx\n", status);
return 1;
}
printf ("Size: %lu\n", size);
printf ("AllocationGranularity: %lu\n", sbi.AllocationGranularity);
#ifdef _WIN64
printf ("dummy1: 0x%lx\n", sbi.dummy1);
#endif
return 0;
}
=== SNAP ===
$ x86_64-w64-mingw32-gcc -g -o sbi sbi.c -lntdll
$ ./sbi
Size: 64
AllocationGranularity: 65536
dummy1: 0xbfbfbfbf
Corinna
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