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This solution is equivalent to DXE core. AllocatePool() allocates POOL_TAIL after the buffer. This POOL_TAIL is checked at FreePool(). If the there is buffer overflow, the issue can be caught at FreePool(). This patch could also handle the eight-byte aligned allocation requirement. The discussion related to the eight-byte aligned allocation requirement is at https://lists.01.org/pipermail/edk2-devel/2017-April/009995.html. According to the PI spec (Vol 4, Section 3.2 SmmAllocatePool()): The SmmAllocatePool() function ... All allocations are eight-byte aligned. Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Hao Wu <hao.a.wu@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Star Zeng <star.zeng@intel.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> Reviewed-by: Hao Wu <hao.a.wu@intel.com>