Re: [edk2-devel] [PATCH 0/2] Reserve page 0 for NULL pointer detection

2019-11-08 Thread Wang, Jian J
Pushed at fb92fe9e1817a53ca0fc985447f3c534201a62fa Regards, Jian > -Original Message- > From: Ni, Ray > Sent: Thursday, November 07, 2019 10:11 AM > To: Wang, Jian J ; devel@edk2.groups.io > Cc: Bi, Dandan ; Gao, Liming ; > Wu, Hao A ; Sean Brogan > Subject: RE: [PATCH 0/2] Reserve page

Re: [edk2-devel] [PATCH 0/2] Reserve page 0 for NULL pointer detection

2019-11-06 Thread Ni, Ray
Reviewed-by: Ray Ni > -Original Message- > From: Wang, Jian J > Sent: Wednesday, November 6, 2019 9:14 PM > To: devel@edk2.groups.io > Cc: Bi, Dandan ; Gao, Liming ; Ni, > Ray ; Wu, Hao A > ; Sean Brogan > Subject: [PATCH 0/2] Reserve page 0 for NULL pointer detection > > When a boot

[edk2-devel] [PATCH 0/2] Reserve page 0 for NULL pointer detection

2019-11-06 Thread Wang, Jian J
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 avai