tyler.durden/audk
1
0
Fork 0
mirror of https://github.com/acidanthera/audk.git synced 2025-07-24 06:04:52 +02:00
Code Issues Packages Projects Releases Wiki Activity

SysCall: Disabled global pages, set User page table attibutes in

Browse Source 
paging syscalls.
This commit is contained in:
Mikhail Krichanov 2024-11-29 11:35:26 +03:00
parent 7720181673
commit 58038f62ad
2 changed files with 22 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
MdeModulePkg/Core/Dxe/SysCall/BootServices.c
View File

@ -605,6 +605,14 @@ CallBootService (
*(EFI_PHYSICAL_ADDRESS *)UserRsp->Arguments[4] = (EFI_PHYSICAL_ADDRESS)Argument4; *(EFI_PHYSICAL_ADDRESS *)UserRsp->Arguments[4] = (EFI_PHYSICAL_ADDRESS)Argument4;
ForbidSupervisorAccessToUserMemory (); ForbidSupervisorAccessToUserMemory ();
gCpu->SetUserMemoryAttributes (
gCpu,
gUserPageTable,
Argument4,
EFI_PAGES_TO_SIZE (CoreRbp->Argument3),
EFI_MEMORY_USER
);
return Status; return Status;
case SysCallFreePages: case SysCallFreePages:
@ -617,6 +625,14 @@ CallBootService (
gCpu->GetMemoryAttributes (gCpu, (EFI_PHYSICAL_ADDRESS)(CoreRbp->Argument2 + CoreRbp->Argument1 * EFI_PAGE_SIZE - 1), &Attributes); gCpu->GetMemoryAttributes (gCpu, (EFI_PHYSICAL_ADDRESS)(CoreRbp->Argument2 + CoreRbp->Argument1 * EFI_PAGE_SIZE - 1), &Attributes);
ASSERT ((Attributes & EFI_MEMORY_USER) != 0); ASSERT ((Attributes & EFI_MEMORY_USER) != 0);
gCpu->SetUserMemoryAttributes (
gCpu,
gUserPageTable,
CoreRbp->Argument2,
EFI_PAGES_TO_SIZE (CoreRbp->Argument1),
EFI_MEMORY_RP
);
return gBS->FreePages ( return gBS->FreePages (
*(EFI_PHYSICAL_ADDRESS *)&CoreRbp->Argument2, *(EFI_PHYSICAL_ADDRESS *)&CoreRbp->Argument2,
CoreRbp->Argument1 CoreRbp->Argument1

8
MdeModulePkg/Core/Dxe/SysCall/X64/InitializeMsr.c
View File

@ -188,8 +188,12 @@ InitializeMsr (
Ebx = 0; Ebx = 0;
Edx = 0; Edx = 0;
// The Intel-64 and IA-32 architectures also allow for global pages when the PGE flag (bit 7) is 1 in CR4. //
// PGE must be zero. // Forbid global pages.
//
Cr4.UintN = AsmReadCr4 ();
Cr4.Bits.PGE = 0;
AsmWriteCr4 (Cr4.UintN);
// //
// Forbid supervisor-mode accesses to any user-mode pages. // Forbid supervisor-mode accesses to any user-mode pages.