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sys: FspUnicodePathIsValid: check and return stream type

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This commit is contained in:
Bill Zissimopoulos
2016-10-05 13:44:32 -07:00
parent 4ccbd1bdf6
commit c6967c737a
5 changed files with 61 additions and 14 deletions
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45
src/sys/util.c
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@ -17,7 +17,7 @@
#include <sys/driver.h>
BOOLEAN FspUnicodePathIsValid(PUNICODE_STRING Path, PUNICODE_STRING StreamPart);
BOOLEAN FspUnicodePathIsValid(PUNICODE_STRING Path, PUNICODE_STRING StreamPart, PULONG StreamType);
BOOLEAN FspUnicodePathIsValidPattern(PUNICODE_STRING Pattern);
VOID FspUnicodePathSuffix(PUNICODE_STRING Path, PUNICODE_STRING Remain, PUNICODE_STRING Suffix);
NTSTATUS FspCreateGuid(GUID *Guid);
@ -171,14 +171,17 @@ PVOID FspAllocateIrpMustSucceed(CCHAR StackSize)
}
}
BOOLEAN FspUnicodePathIsValid(PUNICODE_STRING Path, PUNICODE_STRING StreamPart)
BOOLEAN FspUnicodePathIsValid(PUNICODE_STRING Path, PUNICODE_STRING StreamPart, PULONG StreamType)
{
PAGED_CODE();
/* if StreamPart is not NULL, StreamType must also be not NULL */
ASSERT(0 == StreamPart || 0 != StreamType);
if (0 != Path->Length % sizeof(WCHAR))
return FALSE;
PWSTR PathBgn, PathEnd, PathPtr;
PWSTR PathBgn, PathEnd, PathPtr, StreamTypeStr = 0;
UCHAR Flags = FSRTL_NTFS_LEGAL;
ULONG Colons = 0;
WCHAR Char;
@ -221,15 +224,17 @@ BOOLEAN FspUnicodePathIsValid(PUNICODE_STRING Path, PUNICODE_STRING StreamPart)
if (1 == Colons)
{
/* first time through: set up StreamPart */
StreamPart->Length = StreamPart->MaximumLength =
(USHORT)((PUINT8)PathEnd - (PUINT8)PathPtr);
StreamPart->Length = StreamPart->MaximumLength = (USHORT)
((PUINT8)PathEnd - (PUINT8)PathPtr);
StreamPart->Buffer = PathPtr;
}
else if (2 == Colons)
{
/* second time through: fix StreamPart length to not include 2nd colon */
StreamPart->Length =
(USHORT)((PUINT8)PathPtr - (PUINT8)StreamPart->Buffer - 1);
StreamPart->Length = (USHORT)
((PUINT8)PathPtr - (PUINT8)StreamPart->Buffer - sizeof(WCHAR));
StreamTypeStr = PathPtr;
}
}
else if (0x80 > Char && !FsRtlTestAnsiCharacter(Char, TRUE, FALSE, Flags))
@ -238,7 +243,31 @@ BOOLEAN FspUnicodePathIsValid(PUNICODE_STRING Path, PUNICODE_STRING StreamPart)
PathPtr++;
}
return TRUE;
/* if we had no colons the path is valid */
if (0 == Colons)
return TRUE;
ASSERT(0 != StreamPart && 0 != StreamType);
*StreamType = FspUnicodePathStreamTypeNone;
/* if we had no stream type the path is valid if there was an actual stream name */
if (0 == StreamTypeStr)
return 0 != StreamPart->Length;
/* if we had a stream type the path is valid if the stream type was "$DATA" only */
if (StreamTypeStr + 5 == PathEnd &&
L'$' == StreamTypeStr[0] &&
L'D' == StreamTypeStr[1] &&
L'A' == StreamTypeStr[2] &&
L'T' == StreamTypeStr[3] &&
L'A' == StreamTypeStr[4])
{
*StreamType = FspUnicodePathStreamTypeData;
return TRUE;
}
return FALSE;
}
BOOLEAN FspUnicodePathIsValidPattern(PUNICODE_STRING Path)