Pushed at fb92fe9e1817a53ca0fc985447f3c534201a62fa Regards, Jian
> -----Original Message----- > From: Ni, Ray <ray...@intel.com> > Sent: Thursday, November 07, 2019 10:11 AM > To: Wang, Jian J <jian.j.w...@intel.com>; devel@edk2.groups.io > Cc: Bi, Dandan <dandan...@intel.com>; Gao, Liming <liming....@intel.com>; > Wu, Hao A <hao.a...@intel.com>; Sean Brogan <sean.bro...@microsoft.com> > Subject: RE: [PATCH 0/2] Reserve page 0 for NULL pointer detection > > Reviewed-by: Ray Ni <ray...@intel.com> > > > -----Original Message----- > > From: Wang, Jian J <jian.j.w...@intel.com> > > Sent: Wednesday, November 6, 2019 9:14 PM > > To: devel@edk2.groups.io > > Cc: Bi, Dandan <dandan...@intel.com>; Gao, Liming <liming....@intel.com>; > Ni, Ray <ray...@intel.com>; Wu, Hao A > > <hao.a...@intel.com>; Sean Brogan <sean.bro...@microsoft.com> > > Subject: [PATCH 0/2] Reserve page 0 for NULL pointer detection > > > > When a boot loader examines the memory map, it can see that location 0 > > is available memory. If it chooses to use that memory, and > > PcdNullPointerDetectionPropertyMask is enabled, use of memory in page 0 > > will cause an exception. This does occur when running the memtest86 > > program. > > > > Leaving page 0 available is for legacy support purpose. Since we have > > deprecated the support of legacy, the solution is just reserving it so > > that it cannot be allocated for other uses. > > > > Tests: > > - run memtest86 with PcdNullPointerDetectionPropertyMask set to 0x03 > > - run memtest86 with PcdNullPointerDetectionPropertyMask set to 0x83 > > - boot OVMF into Windows 7 with PcdNullPointerDetectionPropertyMask set > to 0x83 > > > > Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1885 > > Cc: Dandan Bi <dandan...@intel.com> > > Cc: Liming Gao <liming....@intel.com> > > Cc: Ray Ni <ray...@intel.com> > > Cc: Hao A Wu <hao.a...@intel.com> > > Cc: Sean Brogan <sean.bro...@microsoft.com> > > > > Jian J Wang (2): > > MdeModulePkg/DxeIplPeim: reserve page 0 for NULL pointer detection > > MdeModulePkg/Core/Dxe: free page 0 after disabling NULL pointer > > detection > > > > MdeModulePkg/Core/Dxe/Misc/MemoryProtection.c | 5 +++++ > > MdeModulePkg/Core/DxeIplPeim/Ia32/DxeLoadFunc.c | 4 ++++ > > MdeModulePkg/Core/DxeIplPeim/X64/DxeLoadFunc.c | 4 ++++ > > 3 files changed, 13 insertions(+) > > > > -- > > 2.17.1.windows.2 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#50316): https://edk2.groups.io/g/devel/message/50316 Mute This Topic: https://groups.io/mt/44036050/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
