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[NTOSKRNL]

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While attempting to read data from disk in CcReadVirtualAddress(), always align our read size by pages.
That means that even on boundaries, we will read a complete page.
This fixes FSD relying on Cc to properly align reads and thus poorly failing in disk.sys because of unaligned reads.
Notably, it helps MS FastFAT loading a bit farther in ReactOS (but it still fails :-().
This also fixes a few kmtests.

CORE-11003
CORE-11819

svn path=/trunk/; revision=72186
This commit is contained in:
Pierre Schweitzer 2016-08-10 11:52:30 +00:00
parent 57888376d9
commit e3b0a95319
1 changed files with 5 additions and 2 deletions
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7
reactos/ntoskrnl/cc/copy.c
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@ -65,7 +65,7 @@ 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;
@ -77,7 +77,10 @@ CcReadVirtualAddress (
Size = VACB_MAPPING_GRANULARITY; Size = VACB_MAPPING_GRANULARITY;
} }
Mdl = IoAllocateMdl(Vacb->BaseAddress, Size, FALSE, FALSE, NULL); Pages = BYTES_TO_PAGES(Size);
ASSERT(Pages * PAGE_SIZE <= VACB_MAPPING_GRANULARITY);
Mdl = IoAllocateMdl(Vacb->BaseAddress, Pages * PAGE_SIZE, FALSE, FALSE, NULL);
if (!Mdl) if (!Mdl)
{ {
return STATUS_INSUFFICIENT_RESOURCES; return STATUS_INSUFFICIENT_RESOURCES;