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[NTOS:MM] Do not map two pages into hyperspace in MiCopyFromUserPage. CORE-14548

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Doing this is not only wrong because it acquires the same spinlock twice,
it also completely breaks the TLB flushing logic in MiMapPageInHyperSpace.
If the PTE with Offset 1 is still valid when a wrap-around to 0 happens,
the TLB flush on wrap-around will not clear the entry for this previous page.
After another loop around all hyperspace pages, page 1 is re-used but its
TLB entry has not been flushed, which may result into incorrect translation.
This commit is contained in:
Thomas Faber 2018-04-15 19:42:18 +02:00
parent ee8d82f29d
commit b54e5c689c
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2 changed files with 7 additions and 9 deletions
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4
ntoskrnl/include/internal/mm.h
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@ -757,8 +757,8 @@ MmAccessFault(
NTSTATUS
NTAPI
MiCopyFromUserPage(
PFN_NUMBER NewPage,
PFN_NUMBER OldPage
PFN_NUMBER DestPage,
const VOID *SrcAddress
);
/* process.c *****************************************************************/