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Handle non-paged pool overflow
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This commit is contained in:
Aiken Harris
2026-01-30 18:38:54 +01:00
parent 825de8b471
commit 19f5307be6
1 changed files with 29 additions and 29 deletions
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58
xtoskrnl/mm/i686/mmgr.cc
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@@ -396,52 +396,52 @@ MM::Manager::InitializeMemoryLayout(VOID)
/* Compute system PTE size */
ComputeSystemPteSize(&NumberOfSystemPtes);
/* Compute non-paged pool size */
/* Compute the initial and maximum non-paged pool sizes */
ComputeNonPagedPoolSize(&MemoryLayout.NonPagedPoolSize);
ComputeMaximumNonPagedPoolSize(&MaximumNonPagedPoolSize);
/* Compute paged pool size */
ComputePagedPoolSize(&MemoryLayout.PagedPoolSize);
/* Insert the PFN database right after the loader mappings */
/* Position the PFN database right after the loader mappings */
MemoryLayout.PfnDatabase = (PMMPFN)MemoryLayout.LoaderMappingsEnd;
/* Compute the PFN database end address */
PfnDatabaseEnd = (ULONG_PTR)MemoryLayout.PfnDatabase + (MemoryLayout.PfnDatabaseSize * MM_PAGE_SIZE);
/* Check in non-paged pool fits before session space */
if(MemoryLayout.NonPagedPoolSize * MM_PAGE_SIZE <= ((ULONG_PTR)MemoryLayout.SessionSpaceStart - PfnDatabaseEnd))
{
/* Set non-paged pool start and end addresses */
MemoryLayout.NonPagedPoolStart = (PVOID)PfnDatabaseEnd;
MemoryLayout.NonPagedPoolEnd = (PVOID)(PfnDatabaseEnd + MemoryLayout.NonPagedPoolSize * MM_PAGE_SIZE);
/* Position the initial non-paged pool immediately after the PFN database */
MemoryLayout.NonPagedPoolStart = (PVOID)PfnDatabaseEnd;
/* Check if non-paged expansion pool overflows */
/* Check if the calculated non-paged pool size fits in the KVA */
if((MemoryLayout.NonPagedPoolSize * MM_PAGE_SIZE) >
((ULONG_PTR)MemoryLayout.SessionSpaceStart - (ULONG_PTR)MemoryLayout.NonPagedPoolStart))
{
/* Set the final size for the non-paged pool */
MemoryLayout.NonPagedPoolSize = ((ULONG_PTR)MemoryLayout.NonPagedPoolEnd -
(ULONG_PTR)MemoryLayout.NonPagedPoolStart) / MM_PAGE_SIZE;
}
/* Set the final non-paged pool end address */
MemoryLayout.NonPagedPoolEnd = (PVOID)((ULONG_PTR)MemoryLayout.NonPagedPoolStart +
MemoryLayout.NonPagedPoolSize * MM_PAGE_SIZE);
/* Check if non-paged expansion pool overflows */
if((ULONG_PTR)MemoryLayout.NonPagedExpansionPoolStart + MaximumNonPagedPoolSize *
MM_PAGE_SIZE >= (ULONG_PTR)MemoryLayout.NonPagedExpansionPoolStart)
{
/* Check if non-paged expansion pool fits */
if((ULONG_PTR)MemoryLayout.NonPagedExpansionPoolStart + MaximumNonPagedPoolSize *
MM_PAGE_SIZE >= (ULONG_PTR)MemoryLayout.NonPagedExpansionPoolStart)
MM_PAGE_SIZE <= (ULONG_PTR)MemoryLayout.NonPagedExpansionPoolEnd)
{
/* Check if non-paged expansion pool fits */
if((ULONG_PTR)MemoryLayout.NonPagedExpansionPoolStart + MaximumNonPagedPoolSize *
MM_PAGE_SIZE <= (ULONG_PTR)MemoryLayout.NonPagedExpansionPoolEnd)
{
/* Set non-paged expansion pool end address */
MemoryLayout.NonPagedExpansionPoolEnd = (PVOID)((ULONG_PTR)MemoryLayout.NonPagedExpansionPoolStart +
MaximumNonPagedPoolSize * MM_PAGE_SIZE);
}
/* Set new non-paged expansion pool end address */
MemoryLayout.NonPagedExpansionPoolEnd = (PVOID)((ULONG_PTR)MemoryLayout.NonPagedExpansionPoolStart +
MaximumNonPagedPoolSize * MM_PAGE_SIZE);
}
/* Compute non-paged expansion pool size */
MemoryLayout.NonPagedExpansionPoolSize = ((ULONG_PTR)MemoryLayout.NonPagedExpansionPoolEnd -
(ULONG_PTR)MemoryLayout.NonPagedExpansionPoolStart) / MM_PAGE_SIZE;
}
else
{
/* Unfortunally non-paged pool does not fit before session space. What can we do? */
}
/* Update paged pool end address */
MemoryLayout.PagedPoolEnd = (PVOID)(((ULONG_PTR)MemoryLayout.PagedPoolStart +
MemoryLayout.PagedPoolSize * MM_PAGE_SIZE) - 1);
/* Compute non-paged expansion pool size */
MemoryLayout.NonPagedExpansionPoolSize = ((ULONG_PTR)MemoryLayout.NonPagedExpansionPoolEnd -
(ULONG_PTR)MemoryLayout.NonPagedExpansionPoolStart) / MM_PAGE_SIZE;
/* Dump memory layout */
DumpMemoryLayout();