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Ring3: Set 1G User pages as not present by default, fixed padding.

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This commit is contained in:
Mikhail Krichanov 2024-11-29 19:42:10 +03:00
parent 0e14a53096
commit 0fd0e992d0
2 changed files with 5 additions and 2 deletions
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2
MdeModulePkg/Core/Dxe/SysCall/X64/InitializeMsr.c
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@ -111,7 +111,7 @@ MakeUserPageTableTemplate (
//
PageDirectory1GEntry->Uint64 = (UINT64)PageAddress | PageTableInfo->AddressEncMask;
PageDirectory1GEntry->Bits.ReadWrite = 1;
PageDirectory1GEntry->Bits.Present = 1;
PageDirectory1GEntry->Bits.Present = 0;
PageDirectory1GEntry->Bits.MustBe1 = 1;
}
} else {

5
UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ExceptionHandlerAsm.nasm
View File

@ -63,11 +63,14 @@ global ASM_PFX(UserPageTable)
ASM_PFX(UserPageTable):
resq 1
ALIGN 4096
global ASM_PFX(mSwitchCr3Flag)
ASM_PFX(mSwitchCr3Flag):
db 0x0
ALIGN 4096
Padding:
db 0x0
DEFAULT REL
SECTION .text