Hi Jian In V1 review, I suggest to test in UEFI shell env to make sure all page table is read only, with PageTable split in CPU driver.
May I know if that is done? Thank you Yao Jiewen > -----Original Message----- > From: edk2-devel [mailto:[email protected]] On Behalf Of Jian J > Wang > Sent: Monday, December 4, 2017 4:36 PM > To: [email protected] > Subject: [edk2] [PATCH v2 0/4] Enable page table write protection > > > v2 changes: > > a. Enable protection on any newly added page table after DxeIpl. > > b. Introduce page table pool concept to make page table allocation > > and protection easier and error free. > > Write Protect feature (CR0.WP) is always enabled in driver UefiCpuPkg/CpuDxe. > But the memory pages used for page table are not set as read-only in the > driver > DxeIplPeim, after the paging is setup. This might jeopardize the page table > integrity if there's buffer overflow occured in other part of system. > > This patch series will change this situation by clearing R/W bit in page > attribute > of the pages used as page table. > > Validation works include booting Windows (10/server 2016) and Linux > (Fedora/Ubuntu) > on OVMF and Intel real platform. > > Jian J Wang (4): > MdeModulePkg/MdeModulePkg.dec: Add new PCDs and Guid > MdeModulePkg/PageTablePool.h: Page table pool GUID definition file > MdeModulePkg/DxeIpl: Mark page table as read-only > UefiCpuPkg/CpuDxe: Enable protection for newly added page table > > MdeModulePkg/Core/DxeIplPeim/DxeIpl.h | 34 +++ > MdeModulePkg/Core/DxeIplPeim/DxeIpl.inf | 3 + > MdeModulePkg/Core/DxeIplPeim/Ia32/DxeLoadFunc.c | 8 +- > MdeModulePkg/Core/DxeIplPeim/X64/VirtualMemory.c | 315 > +++++++++++++++++++++- > MdeModulePkg/Core/DxeIplPeim/X64/VirtualMemory.h | 15 ++ > MdeModulePkg/Include/Guid/PageTablePool.h | 53 ++++ > MdeModulePkg/MdeModulePkg.dec | 28 ++ > UefiCpuPkg/CpuDxe/CpuDxe.c | 17 +- > UefiCpuPkg/CpuDxe/CpuDxe.h | 2 + > UefiCpuPkg/CpuDxe/CpuDxe.inf | 3 + > UefiCpuPkg/CpuDxe/CpuPageTable.c | 329 > ++++++++++++++++++++++- > UefiCpuPkg/CpuDxe/CpuPageTable.h | 22 ++ > 12 files changed, 816 insertions(+), 13 deletions(-) > create mode 100644 MdeModulePkg/Include/Guid/PageTablePool.h > > -- > 2.14.1.windows.1 > > _______________________________________________ > edk2-devel mailing list > [email protected] > https://lists.01.org/mailman/listinfo/edk2-devel _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
