Author: sir_richard Date: Sat Jun 5 21:19:28 2010 New Revision: 47600
URL: http://svn.reactos.org/svn/reactos?rev=47600&view=rev Log: [NTOS]: Fix up POOL_PREV_BLOCK based on suggestion by hpoussin. [NTOS]: Fix up NTAPI location in function definition. [NTOS]: Implement even more stringent header checks: ExpCheckPoolHeader and ExpCheckPoolBlocks. Normally we would only want this on a DBG build, but I am enabling them for now until I can fix paged pool. If your machine crashes, reverting this commit is NOT the solution (boots for me). [NTOS]: Add a AllowPagedPool BOOLEAN that will allow us to selectively enable when the ARM3 pool can be used, playing around with the situation that causes the corruption, and perhaps making it easier to find/fix.
Modified: trunk/reactos/ntoskrnl/mm/ARM3/expool.c
Modified: trunk/reactos/ntoskrnl/mm/ARM3/expool.c URL: http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/mm/ARM3/expool.c?r... ============================================================================== --- trunk/reactos/ntoskrnl/mm/ARM3/expool.c [iso-8859-1] (original) +++ trunk/reactos/ntoskrnl/mm/ARM3/expool.c [iso-8859-1] Sat Jun 5 21:19:28 2010 @@ -19,6 +19,8 @@ #undef ExAllocatePoolWithQuota #undef ExAllocatePoolWithQuotaTag
+BOOLEAN AllowPagedPool = FALSE; + /* GLOBALS ********************************************************************/
ULONG ExpNumberOfPagedPools; @@ -33,7 +35,7 @@ #define POOL_FREE_BLOCK(x) (PLIST_ENTRY)((ULONG_PTR)(x) + sizeof(POOL_HEADER)) #define POOL_BLOCK(x, i) (PPOOL_HEADER)((ULONG_PTR)(x) + ((i) * POOL_BLOCK_SIZE)) #define POOL_NEXT_BLOCK(x) POOL_BLOCK((x), (x)->BlockSize) -#define POOL_PREV_BLOCK(x) POOL_BLOCK((x), -(x)->PreviousSize) +#define POOL_PREV_BLOCK(x) POOL_BLOCK((x), -((x)->PreviousSize))
/* * Pool list access debug macros, similar to Arthur's pfnlist.c work. @@ -51,22 +53,22 @@ * * For now, these are not made inline, so we can get good stack traces. */ -NTAPI PLIST_ENTRY +NTAPI ExpDecodePoolLink(IN PLIST_ENTRY Link) { return (PLIST_ENTRY)((ULONG_PTR)Link & ~1); }
-NTAPI PLIST_ENTRY +NTAPI ExpEncodePoolLink(IN PLIST_ENTRY Link) { return (PLIST_ENTRY)((ULONG_PTR)Link | 1); }
-NTAPI -VOID +VOID +NTAPI ExpCheckPoolLinks(IN PLIST_ENTRY ListHead) { if ((ExpDecodePoolLink(ExpDecodePoolLink(ListHead->Flink)->Blink) != ListHead) || @@ -80,22 +82,22 @@ } }
-NTAPI -VOID +VOID +NTAPI ExpInitializePoolListHead(IN PLIST_ENTRY ListHead) { ListHead->Flink = ListHead->Blink = ExpEncodePoolLink(ListHead); }
-NTAPI BOOLEAN +NTAPI ExpIsPoolListEmpty(IN PLIST_ENTRY ListHead) { return (ExpDecodePoolLink(ListHead->Flink) == ListHead); }
-NTAPI -VOID +VOID +NTAPI ExpRemovePoolEntryList(IN PLIST_ENTRY Entry) { PLIST_ENTRY Blink, Flink; @@ -105,8 +107,8 @@ Blink->Flink = ExpEncodePoolLink(Flink); }
-NTAPI PLIST_ENTRY +NTAPI ExpRemovePoolHeadList(IN PLIST_ENTRY ListHead) { PLIST_ENTRY Entry, Flink; @@ -117,8 +119,8 @@ return Entry; }
-NTAPI PLIST_ENTRY +NTAPI ExpRemovePoolTailList(IN PLIST_ENTRY ListHead) { PLIST_ENTRY Entry, Blink; @@ -129,8 +131,8 @@ return Entry; }
-NTAPI -VOID +VOID +NTAPI ExpInsertPoolTailList(IN PLIST_ENTRY ListHead, IN PLIST_ENTRY Entry) { @@ -144,8 +146,8 @@ ExpCheckPoolLinks(ListHead); }
-NTAPI -VOID +VOID +NTAPI ExpInsertPoolHeadList(IN PLIST_ENTRY ListHead, IN PLIST_ENTRY Entry) { @@ -159,6 +161,131 @@ ExpCheckPoolLinks(ListHead); }
+VOID +NTAPI +ExpCheckPoolHeader(IN PPOOL_HEADER Entry) +{ + PPOOL_HEADER PreviousEntry, NextEntry; + + /* Is there a block before this one? */ + if (Entry->PreviousSize) + { + /* Get it */ + PreviousEntry = POOL_PREV_BLOCK(Entry); + + /* The two blocks must be on the same page! */ + if (PAGE_ALIGN(Entry) != PAGE_ALIGN(PreviousEntry)) + { + /* Something is awry */ + KeBugCheckEx(BAD_POOL_HEADER, + 6, + (ULONG_PTR)PreviousEntry, + __LINE__, + (ULONG_PTR)Entry); + } + + /* This block should also indicate that it's as large as we think it is */ + if (PreviousEntry->BlockSize != Entry->PreviousSize) + { + /* Otherwise, someone corrupted one of the sizes */ + KeBugCheckEx(BAD_POOL_HEADER, + 5, + (ULONG_PTR)PreviousEntry, + __LINE__, + (ULONG_PTR)Entry); + } + } + else if (PAGE_ALIGN(Entry) != Entry) + { + /* If there's no block before us, we are the first block, so we should be on a page boundary */ + KeBugCheckEx(BAD_POOL_HEADER, + 7, + 0, + __LINE__, + (ULONG_PTR)Entry); + } + + /* This block must have a size */ + if (!Entry->BlockSize) + { + /* Someone must've corrupted this field */ + KeBugCheckEx(BAD_POOL_HEADER, + 8, + 0, + __LINE__, + (ULONG_PTR)Entry); + } + + /* Okay, now get the next block */ + NextEntry = POOL_NEXT_BLOCK(Entry); + + /* If this is the last block, then we'll be page-aligned, otherwise, check this block */ + if (PAGE_ALIGN(NextEntry) != NextEntry) + { + /* The two blocks must be on the same page! */ + if (PAGE_ALIGN(Entry) != PAGE_ALIGN(NextEntry)) + { + /* Something is messed up */ + KeBugCheckEx(BAD_POOL_HEADER, + 9, + (ULONG_PTR)NextEntry, + __LINE__, + (ULONG_PTR)Entry); + } + + /* And this block should think we are as large as we truly are */ + if (NextEntry->PreviousSize != Entry->BlockSize) + { + /* Otherwise, someone corrupted the field */ + KeBugCheckEx(BAD_POOL_HEADER, + 5, + (ULONG_PTR)NextEntry, + __LINE__, + (ULONG_PTR)Entry); + } + } +} + +VOID +NTAPI +ExpCheckPoolBlocks(IN PVOID Block) +{ + BOOLEAN FoundBlock; + SIZE_T Size = 0; + PPOOL_HEADER Entry; + + /* Get the first entry for this page, make sure it really is the first */ + Entry = PAGE_ALIGN(Block); + ASSERT(Entry->PreviousSize == 0); + + /* Now scan each entry */ + while (TRUE) + { + /* When we actually found our block, remember this */ + if (Entry == Block) FoundBlock = TRUE; + + /* Now validate this block header */ + ExpCheckPoolHeader(Entry); + + /* And go to the next one, keeping track of our size */ + Size += Entry->BlockSize; + Entry = POOL_NEXT_BLOCK(Entry); + + /* If we hit the last block, stop */ + if (Size >= (PAGE_SIZE / POOL_BLOCK_SIZE)) break; + + /* If we hit the end of the page, stop */ + if (PAGE_ALIGN(Entry) == Entry) break; + } + + /* We must've found our block, and we must have hit the end of the page */ + if ((PAGE_ALIGN(Entry) != Entry) || !(FoundBlock)) + { + /* Otherwise, the blocks are messed up */ + KeBugCheckEx(BAD_POOL_HEADER, 10, (ULONG_PTR)Block, __LINE__, (ULONG_PTR)Entry); + } +} + /* PRIVATE FUNCTIONS **********************************************************/
VOID @@ -331,8 +458,8 @@ // // Check for paged pool // - if (PoolType == PagedPool) return ExAllocatePagedPoolWithTag(PagedPool, NumberOfBytes, Tag); - + if (!(AllowPagedPool) && (PoolType == PagedPool)) return ExAllocatePagedPoolWithTag(PagedPool, NumberOfBytes, Tag); + // // Some sanity checks // @@ -418,6 +545,7 @@ ExpCheckPoolLinks(ListHead); Entry = POOL_ENTRY(ExpRemovePoolHeadList(ListHead)); ExpCheckPoolLinks(ListHead); + ExpCheckPoolBlocks(Entry); ASSERT(Entry->BlockSize >= i); ASSERT(Entry->PoolType == 0);
@@ -534,6 +662,7 @@ // and release the lock since we're done // Entry->PoolType = PoolType + 1; + ExpCheckPoolBlocks(Entry); ExUnlockPool(PoolDesc, OldIrql);
// @@ -590,12 +719,14 @@ // // Release the pool lock // + ExpCheckPoolBlocks(Entry); ExUnlockPool(PoolDesc, OldIrql); }
// // And return the pool allocation // + ExpCheckPoolBlocks(Entry); Entry->PoolTag = Tag; return POOL_FREE_BLOCK(Entry); } @@ -628,12 +759,12 @@ POOL_TYPE PoolType; PPOOL_DESCRIPTOR PoolDesc; BOOLEAN Combined = FALSE; -#if 1 + // // Check for paged pool // - if ((P >= MmPagedPoolBase) && - (P <= (PVOID)((ULONG_PTR)MmPagedPoolBase + MmPagedPoolSize))) + if (!(AllowPagedPool) && ((P >= MmPagedPoolBase) && + (P <= (PVOID)((ULONG_PTR)MmPagedPoolBase + MmPagedPoolSize)))) { // // Use old allocator @@ -641,7 +772,6 @@ ExFreePagedPool(P); return; } -#endif
// // Quickly deal with big page allocations @@ -680,6 +810,7 @@ // // Check if the next allocation is at the end of the page // + ExpCheckPoolBlocks(Entry); if (PAGE_ALIGN(NextEntry) != NextEntry) { //