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MdeModulePkg: cleanup Heap Guard pool/page type PCD documentation 

This cleanup is meant for avoiding misuse of newly introduced BIT4
(UAF detection) of PCD PcdHeapGuardPropertyMask, because it applies
to all types of physical memory. In another words,
PcdHeapGuardPoolType and PcdHeapGuardPageType don't have effect to
the BIT4 of PcdHeapGuardPropertyMask.

Cc: Star Zeng <star.zeng@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Jian J Wang 2018-10-24 10:14:43 +08:00
parent d2aefa0adf
commit a6bde8a644
2 changed files with 6 additions and 0 deletions
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4
MdeModulePkg/MdeModulePkg.dec
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@ -955,6 +955,8 @@
# free pages for all of them. The page allocation for the type related to
# cleared bits keeps the same as ususal.
#
# This PCD is only valid if BIT0 and/or BIT2 are set in PcdHeapGuardPropertyMask.
#
# Below is bit mask for this PCD: (Order is same as UEFI spec)<BR>
# EfiReservedMemoryType 0x0000000000000001<BR>
# EfiLoaderCode 0x0000000000000002<BR>
@ -984,6 +986,8 @@
# if there's enough free memory for all of them. The pool allocation for the
# type related to cleared bits keeps the same as ususal.
#
# This PCD is only valid if BIT1 and/or BIT3 are set in PcdHeapGuardPropertyMask.
#
# Below is bit mask for this PCD: (Order is same as UEFI spec)<BR>
# EfiReservedMemoryType 0x0000000000000001<BR>
# EfiLoaderCode 0x0000000000000002<BR>

2
MdeModulePkg/MdeModulePkg.uni
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@ -1171,6 +1171,7 @@
" before and after corresponding type of pages allocated if there's enough\n"
" free pages for all of them. The page allocation for the type related to\n"
" cleared bits keeps the same as ususal.\n\n"
" This PCD is only valid if BIT0 and/or BIT2 are set in PcdHeapGuardPropertyMask.\n\n"
" Below is bit mask for this PCD: (Order is same as UEFI spec)<BR>\n"
" EfiReservedMemoryType 0x0000000000000001\n"
" EfiLoaderCode 0x0000000000000002\n"
@ -1198,6 +1199,7 @@
" before and after corresponding type of pages which the allocated pool occupies,\n"
" if there's enough free memory for all of them. The pool allocation for the\n"
" type related to cleared bits keeps the same as ususal.\n\n"
" This PCD is only valid if BIT1 and/or BIT3 are set in PcdHeapGuardPropertyMask.\n\n"
" Below is bit mask for this PCD: (Order is same as UEFI spec)<BR>\n"
" EfiReservedMemoryType 0x0000000000000001\n"
" EfiLoaderCode 0x0000000000000002\n"