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[NTOS:KE] Do not call MmSetPageProtect for the Pentium Lock Errata

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CORE-17589
This commit is contained in:
Jérôme Gardou 2021-05-21 10:49:53 +02:00
parent 9f549dba1e
commit 0395049986
1 changed files with 5 additions and 1 deletions
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6
ntoskrnl/ke/i386/cpu.c
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@ -1089,6 +1089,7 @@ KiI386PentiumLockErrataFixup(VOID)
{
KDESCRIPTOR IdtDescriptor = {0, 0, 0};
PKIDTENTRY NewIdt, NewIdt2;
PMMPTE PointerPte;
/* Allocate memory for a new IDT */
NewIdt = ExAllocatePool(NonPagedPool, 2 * PAGE_SIZE);
@ -1114,7 +1115,10 @@ KiI386PentiumLockErrataFixup(VOID)
_enable();
/* Set the first 7 entries as read-only to produce a fault */
MmSetPageProtect(NULL, NewIdt, PAGE_READONLY);
PointerPte = MiAddressToPte(NewIdt);
ASSERT(PointerPte->u.Hard.Write == 1);
PointerPte->u.Hard.Write = 0;
KeInvalidateTlbEntry(NewIdt);
}
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