REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3488
Current free pool routine from PiSmmCore will inspect memory guard status for target buffer without considering pool headers. This could lead to `IsMemoryGuarded` function to return incorrect results. i.e. A 0-sized pool that is configured to be near tail guard page, it could cause the returned region points into a guard page, which is legal. However, trying to free this 0 sized pool will cause `IsMemoryGuarded` to access guard page, which leads to page fault. This change will inspect memory guarded with pool headers. This can avoid errors when a pool content happens to be on a page boundary. Patch v1 branch: https://github.com/kuqin12/edk2/tree/mm_zero_sized_pool Cc: Jiewen Yao <jiewen....@intel.com> Cc: Eric Dong <eric.d...@intel.com> Cc: Ray Ni <ray...@intel.com> Cc: Jian J Wang <jian.j.w...@intel.com> Cc: Liming Gao <gaolim...@byosoft.com.cn> Kun Qin (1): MdeModulePkg: PiSmmCore: Inspect memory guarded with pool headers MdeModulePkg/Core/PiSmmCore/Pool.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) -- 2.35.1.windows.2 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#87618): https://edk2.groups.io/g/devel/message/87618 Mute This Topic: https://groups.io/mt/89815349/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
