> v2: > a. add more specific explanations in commit message > b. add more comments in code > c. remove redundant logic in code > d. fix logic hole in code > e. replace meanless constant macro with meaning ones > f. remove irrelated changes
This patch series try to fix an issue caused by trying to free memory allocated in DXE but freed in SMM mode. This happens only if Heap Guard feature is enabled, which needs to update page table. The root cause is that DXE and SMM don't share the same paging configuration but CpuDxe driver still tries to access page table through current processor registers (CR3) in SMM mode, during memory free opration in DXE core. This will cause DXE core got the incorrect paging attributes of memory to be freed, and then fail the free operation. The solution is let CpuDxe store the paging configuration in a global variable and use it to access DXE page table if in SMM mode. Jian J Wang (2): UefiCpuPkg/CpuDxe: allow accessing (DXE) page table in SMM mode MdeModulePkg/Core: remove SMM check for Heap Guard feature detection MdeModulePkg/Core/Dxe/Mem/HeapGuard.c | 10 --- UefiCpuPkg/CpuDxe/CpuDxe.inf | 1 + UefiCpuPkg/CpuDxe/CpuPageTable.c | 159 ++++++++++++++++++++++++++-------- 3 files changed, 123 insertions(+), 47 deletions(-) -- 2.16.2.windows.1 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
