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Windows Driver: save FPU state in 32-bit mode before run Whirlpool SSE implementation to avoid issues (https://msdn.microsoft.com/fr-fr/library/ff565388(v=vs.85).aspx)

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This commit is contained in:
Mounir IDRASSI
2016-06-17 23:50:44 +02:00
parent bdc5782f16
commit 2faa1290c0
2 changed files with 34 additions and 0 deletions
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12
src/Driver/DriveFilter.c
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@@ -27,6 +27,7 @@
#include "Wipe.h"
#include "DriveFilter.h"
#include "Boot/Windows/BootCommon.h"
#include "cpu.h"
static BOOL DeviceFilterActive = FALSE;
@@ -258,6 +259,12 @@ static void ComputeBootLoaderFingerprint(PDEVICE_OBJECT LowerDeviceObject, byte*
status = TCReadDevice (LowerDeviceObject, ioBuffer, offset, TC_SECTOR_SIZE_BIOS);
if (NT_SUCCESS (status))
{
#if !defined (_WIN64)
KFLOATING_SAVE floatingPointState;
NTSTATUS saveStatus = STATUS_SUCCESS;
if (HasISSE())
saveStatus = KeSaveFloatingPointState (&floatingPointState);
#endif
WHIRLPOOL_add (ioBuffer, TC_BOOT_SECTOR_PIM_VALUE_OFFSET * 8, &whirlpool);
WHIRLPOOL_add (ioBuffer + TC_BOOT_SECTOR_USER_MESSAGE_OFFSET + TC_BOOT_SECTOR_USER_MESSAGE_MAX_LENGTH, (TC_BOOT_SECTOR_USER_CONFIG_OFFSET - (TC_BOOT_SECTOR_USER_MESSAGE_OFFSET + TC_BOOT_SECTOR_USER_MESSAGE_MAX_LENGTH)) * 8, &whirlpool);
WHIRLPOOL_add (ioBuffer + TC_BOOT_SECTOR_USER_CONFIG_OFFSET + 1, (TC_MAX_MBR_BOOT_CODE_SIZE - (TC_BOOT_SECTOR_USER_CONFIG_OFFSET + 1)) * 8, &whirlpool);
@@ -293,6 +300,11 @@ static void ComputeBootLoaderFingerprint(PDEVICE_OBJECT LowerDeviceObject, byte*
WHIRLPOOL_finalize (&whirlpool, BootLoaderFingerprint);
sha512_end (&BootLoaderFingerprint [WHIRLPOOL_DIGESTSIZE], &sha2);
}
#if !defined (_WIN64)
if (NT_SUCCESS (saveStatus) && HasISSE())
KeRestoreFloatingPointState (&floatingPointState);
#endif
}
else
{