MdeModulePkg/Core: fix feature conflict between NX and NULL detection
authorJian J Wang <jian.j.wang@intel.com>
Mon, 29 Jan 2018 11:07:29 +0000 (19:07 +0800)
committerStar Zeng <star.zeng@intel.com>
Fri, 2 Feb 2018 01:50:16 +0000 (09:50 +0800)
If enabled, NX memory protection feature will mark all free memory as
NX (non-executable), including page 0. This will overwrite the attributes
of page 0 if NULL pointer detection feature is also enabled and then
compromise the functionality of it. The solution is skipping the NX
attributes setting to page 0 if NULL pointer detection feature is enabled.

Cc: Star Zeng <star.zeng@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>

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