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Windows: Add option to avoid PIM prompt in pre-boot authentication by storing PIM value unencrypted in MBR.

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This commit is contained in:
Mounir IDRASSI
2016-04-20 00:30:28 +02:00
parent bd9105794b
commit 1396269d57
14 changed files with 186 additions and 90 deletions
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10
src/Boot/Windows/BootConfig.cpp
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@@ -32,7 +32,7 @@ Partition EncryptedVirtualPartition;
Partition ActivePartition;
Partition PartitionFollowingActive;
bool ExtraBootPartitionPresent = false;
uint64 HiddenVolumeStartUnitNo;
uint64 PimValueOrHiddenVolumeStartUnitNo; // reuse this variable for stored PIM value to reduce memory usage
uint64 HiddenVolumeStartSector;
#ifndef TC_WINDOWS_BOOT_RESCUE_DISK_MODE
@@ -68,6 +68,14 @@ void ReadBootSectorUserConfiguration ()
DisableScreenOutput();
}
if (userConfig & TC_BOOT_USER_CFG_FLAG_DISABLE_PIM)
{
PimValueOrHiddenVolumeStartUnitNo.LowPart = 0;
memcpy (&PimValueOrHiddenVolumeStartUnitNo.LowPart, SectorBuffer + TC_BOOT_SECTOR_PIM_VALUE_OFFSET, TC_BOOT_SECTOR_PIM_VALUE_SIZE);
}
else
PimValueOrHiddenVolumeStartUnitNo.LowPart = -1;
OuterVolumeBackupHeaderCrc = *(uint32 *) (SectorBuffer + TC_BOOT_SECTOR_OUTER_VOLUME_BAK_HEADER_CRC_OFFSET);
ret: