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[0.4.11] Revert "[NTOSKRNL] Properly align VACB writes"

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to avoid CORE-15384 "ros corrupts FAT16 partition"

This reverts commit 0.4.11-dev-210-g
2a80ae2bb6
This commit is contained in:
Joachim Henze 2018-12-17 00:14:06 +01:00
parent b906163dc1
commit 78cd6265d9
1 changed files with 4 additions and 9 deletions
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13
ntoskrnl/cc/copy.c
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@ -81,7 +81,7 @@ NTAPI
CcReadVirtualAddress ( CcReadVirtualAddress (
PROS_VACB Vacb) PROS_VACB Vacb)
{ {
ULONG Size; ULONG Size, Pages;
PMDL Mdl; PMDL Mdl;
NTSTATUS Status; NTSTATUS Status;
IO_STATUS_BLOCK IoStatus; IO_STATUS_BLOCK IoStatus;
@ -95,11 +95,10 @@ CcReadVirtualAddress (
} }
Size = LargeSize.LowPart; Size = LargeSize.LowPart;
Size = ROUND_TO_PAGES(Size); Pages = BYTES_TO_PAGES(Size);
ASSERT(Size <= VACB_MAPPING_GRANULARITY); ASSERT(Pages * PAGE_SIZE <= VACB_MAPPING_GRANULARITY);
ASSERT(Size > 0);
Mdl = IoAllocateMdl(Vacb->BaseAddress, Size, FALSE, FALSE, NULL); Mdl = IoAllocateMdl(Vacb->BaseAddress, Pages * PAGE_SIZE, FALSE, FALSE, NULL);
if (!Mdl) if (!Mdl)
{ {
return STATUS_INSUFFICIENT_RESOURCES; return STATUS_INSUFFICIENT_RESOURCES;
@ -178,10 +177,6 @@ CcWriteVirtualAddress (
} while (++i < (Size >> PAGE_SHIFT)); } while (++i < (Size >> PAGE_SHIFT));
} }
Size = ROUND_TO_PAGES(Size);
ASSERT(Size <= VACB_MAPPING_GRANULARITY);
ASSERT(Size > 0);
Mdl = IoAllocateMdl(Vacb->BaseAddress, Size, FALSE, FALSE, NULL); Mdl = IoAllocateMdl(Vacb->BaseAddress, Size, FALSE, FALSE, NULL);
if (!Mdl) if (!Mdl)
{ {