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[NTOS/FSRTL] Fix MCB tests

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- Fix behaviour when adding or removing entries in the middle of an existing run
 - Do not touch output parameters when failing, caller might rely on this.
This commit is contained in:
Jérôme Gardou 2020-11-30 12:42:33 +01:00
parent b4debdcf4d
commit 3d4cf8d2d8
1 changed files with 58 additions and 15 deletions
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73
ntoskrnl/fsrtl/largemcb.c
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@ -143,7 +143,7 @@ FsRtlAddBaseMcbEntry(IN PBASE_MCB OpaqueMcb,
LARGE_MCB_MAPPING_ENTRY Node, NeedleRun;
PLARGE_MCB_MAPPING_ENTRY LowerRun, HigherRun;
BOOLEAN NewElement;
LONGLONG IntLbn;
LONGLONG IntLbn, IntSectorCount;
DPRINT("FsRtlAddBaseMcbEntry(%p, %I64d, %I64d, %I64d)\n", OpaqueMcb, Vbn, Lbn, SectorCount);
@ -159,7 +159,7 @@ FsRtlAddBaseMcbEntry(IN PBASE_MCB OpaqueMcb,
goto quit;
}
IntResult = FsRtlLookupBaseMcbEntry(OpaqueMcb, Vbn, &IntLbn, NULL, NULL, NULL, NULL);
IntResult = FsRtlLookupBaseMcbEntry(OpaqueMcb, Vbn, &IntLbn, &IntSectorCount, NULL, NULL, NULL);
if (IntResult)
{
if (IntLbn != -1 && IntLbn != Lbn)
@ -167,6 +167,12 @@ FsRtlAddBaseMcbEntry(IN PBASE_MCB OpaqueMcb,
Result = FALSE;
goto quit;
}
if ((IntLbn != -1) && (IntSectorCount >= SectorCount))
{
/* This is a no-op */
goto quit;
}
}
/* clean any possible previous entries in our range */
@ -314,7 +320,7 @@ FsRtlAddLargeMcbEntry(IN PLARGE_MCB Mcb,
* Value less or equal to %0 is forbidden; FIXME: Is the reject of %0 W32 compliant?
*
* Retrieves the parameters of the specified run with index @RunIndex.
*
*
* Mapping %0 always starts at virtual block %0, either as 'hole' or as 'real' mapping.
* libcaptive does not store 'hole' information to its #GTree.
* Last run is always a 'real' run. 'hole' runs appear as mapping to constant @Lbn value %-1.
@ -336,7 +342,7 @@ FsRtlGetNextBaseMcbEntry(IN PBASE_MCB OpaqueMcb,
ULONGLONG LastVbn = 0;
ULONGLONG LastSectorCount = 0;
// Traverse the tree
// Traverse the tree
for (Run = (PLARGE_MCB_MAPPING_ENTRY)RtlEnumerateGenericTable(&Mcb->Mapping->Table, TRUE);
Run;
Run = (PLARGE_MCB_MAPPING_ENTRY)RtlEnumerateGenericTable(&Mcb->Mapping->Table, FALSE))
@ -373,11 +379,6 @@ FsRtlGetNextBaseMcbEntry(IN PBASE_MCB OpaqueMcb,
LastSectorCount = Run->RunEndVbn.QuadPart - Run->RunStartVbn.QuadPart;
}
// these values are meaningless when returning false (but setting them can be helpful for debugging purposes)
*Vbn = 0xdeadbeef;
*Lbn = 0xdeadbeef;
*SectorCount = 0xdeadbeef;
quit:
DPRINT("FsRtlGetNextBaseMcbEntry(%p, %d, %p, %p, %p) = %d (%I64d, %I64d, %I64d)\n", Mcb, RunIndex, Vbn, Lbn, SectorCount, Result, *Vbn, *Lbn, *SectorCount);
return Result;
@ -542,11 +543,6 @@ FsRtlLookupBaseMcbEntry(IN PBASE_MCB OpaqueMcb,
}
}
if (Lbn)
*Lbn = -1;
if (StartingLbn)
*StartingLbn = -1;
quit:
DPRINT("FsRtlLookupBaseMcbEntry(%p, %I64d, %p, %p, %p, %p, %p) = %d (%I64d, %I64d, %I64d, %I64d, %d)\n",
OpaqueMcb, Vbn, Lbn, SectorCountFromLbn, StartingLbn, SectorCountFromStartingLbn, Index, Result,
@ -821,7 +817,7 @@ FsRtlRemoveBaseMcbEntry(IN PBASE_MCB OpaqueMcb,
NeedleRun.RunStartVbn.QuadPart = Vbn;
NeedleRun.RunEndVbn.QuadPart = Vbn + SectorCount;
NeedleRun.StartingLbn.QuadPart = ~0ULL;
NeedleRun.StartingLbn.QuadPart = -1;
/* adjust/destroy all intersecting ranges */
Mcb->Mapping->Table.CompareRoutine = McbMappingIntersectCompare;
@ -829,13 +825,60 @@ FsRtlRemoveBaseMcbEntry(IN PBASE_MCB OpaqueMcb,
{
if (HaystackRun->RunStartVbn.QuadPart < NeedleRun.RunStartVbn.QuadPart)
{
LONGLONG HaystackRunEnd = HaystackRun->RunEndVbn.QuadPart;
ASSERT(HaystackRun->RunEndVbn.QuadPart > NeedleRun.RunStartVbn.QuadPart);
HaystackRun->RunEndVbn.QuadPart = NeedleRun.RunStartVbn.QuadPart;
if (HaystackRunEnd > NeedleRun.RunEndVbn.QuadPart)
{
/* The run we are deleting is included in the run we just truncated.
* Add the tail back. */
LARGE_MCB_MAPPING_ENTRY TailRun;
BOOLEAN NewElement;
TailRun.RunStartVbn.QuadPart = NeedleRun.RunEndVbn.QuadPart;
TailRun.RunEndVbn.QuadPart = HaystackRunEnd;
TailRun.StartingLbn.QuadPart = HaystackRun->StartingLbn.QuadPart + (NeedleRun.RunEndVbn.QuadPart - HaystackRun->RunStartVbn.QuadPart);
Mcb->Mapping->Table.CompareRoutine = McbMappingCompare;
RtlInsertElementGenericTable(&Mcb->Mapping->Table, &TailRun, sizeof(TailRun), &NewElement);
++Mcb->PairCount;
ASSERT(NewElement);
Mcb->Mapping->Table.CompareRoutine = McbMappingIntersectCompare;
}
}
else if (HaystackRun->RunEndVbn.QuadPart > NeedleRun.RunEndVbn.QuadPart)
{
LONGLONG HaystackRunStart = HaystackRun->RunStartVbn.QuadPart;
LONGLONG HaystackStartingLbn = HaystackRun->StartingLbn.QuadPart;
ASSERT(HaystackRun->RunStartVbn.QuadPart < NeedleRun.RunEndVbn.QuadPart);
HaystackRun->RunStartVbn.QuadPart = NeedleRun.RunEndVbn.QuadPart;
/* Adjust the starting LBN */
HaystackRun->StartingLbn.QuadPart += NeedleRun.RunEndVbn.QuadPart - HaystackRunStart;
if (HaystackRunStart < NeedleRun.RunStartVbn.QuadPart)
{
/* The run we are deleting is included in the run we just truncated.
* Add the head back. */
LARGE_MCB_MAPPING_ENTRY HeadRun;
BOOLEAN NewElement;
HeadRun.RunStartVbn.QuadPart = HaystackRunStart;
HeadRun.RunEndVbn.QuadPart = NeedleRun.RunStartVbn.QuadPart;
HeadRun.StartingLbn.QuadPart = HaystackStartingLbn;
Mcb->Mapping->Table.CompareRoutine = McbMappingCompare;
RtlInsertElementGenericTable(&Mcb->Mapping->Table, &HeadRun, sizeof(HeadRun), &NewElement);
++Mcb->PairCount;
ASSERT(NewElement);
Mcb->Mapping->Table.CompareRoutine = McbMappingIntersectCompare;
}
}
else
{