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[NTOSKRNL]

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Fix string size to store GPT GUIDs.
This was causing a buffer overflow (with ending null char) and thus a stack corruption.
The side effect of the stack corruption was that the debug code (display) was looping
forever while attempting to read partition table making ntoskrnl unable to boot with
a machine where there's a GPT disk.
Kernel is now able again to handle GPT disks (and they can be used again in user-land).

This was magically hidding before r59923 or by disabling NDEBUG. Lovely Heisenbugs :-).

svn path=/trunk/; revision=60003
This commit is contained in:
Pierre Schweitzer 2013-09-10 13:42:34 +00:00
parent 36f1e2f5d1
commit bd3ccd4826
1 changed files with 5 additions and 3 deletions
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8
reactos/ntoskrnl/fstub/fstubex.c
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@ -86,6 +86,8 @@ typedef struct _MASTER_BOOT_RECORD
#define EFI_HEADER_REVISION_1 0x00010000
/* Defines system type for MBR showing that a GPT is following */
#define EFI_PMBR_OSTYPE_EFI 0xEE
/* Defines size to store a complete GUID + null char */
#define EFI_GUID_STRING_SIZE 0x27
#define IS_VALID_DISK_INFO(Disk) \
(Disk) && \
@ -534,7 +536,7 @@ NTAPI
FstubDbgPrintDriveLayoutEx(IN PDRIVE_LAYOUT_INFORMATION_EX DriveLayout)
{
ULONG i;
CHAR Guid[38];
CHAR Guid[EFI_GUID_STRING_SIZE];
PAGED_CODE();
DPRINT("FSTUB: DRIVE_LAYOUT_INFORMATION_EX: %p\n", DriveLayout);
@ -575,7 +577,7 @@ NTAPI
FstubDbgPrintPartitionEx(IN PPARTITION_INFORMATION_EX PartitionEntry,
IN ULONG PartitionNumber)
{
CHAR Guid[38];
CHAR Guid[EFI_GUID_STRING_SIZE];
PAGED_CODE();
DPRINT("Printing partition %lu\n", PartitionNumber);
@ -614,7 +616,7 @@ NTAPI
FstubDbgPrintSetPartitionEx(IN PSET_PARTITION_INFORMATION_EX PartitionEntry,
IN ULONG PartitionNumber)
{
CHAR Guid[38];
CHAR Guid[EFI_GUID_STRING_SIZE];
PAGED_CODE();
DPRINT("FSTUB: SET_PARTITION_INFORMATION_EX: %p\n", PartitionEntry);