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MdeModulePkg: define PCD for DXE memory protection policy 

Define a new fixed/patchable PCD that sets the DXE memory protection
policy: its primary use is to define which memory types should have
their executable permissions removed. Combined with the image protection
policy, this can be used to implement a strict W^X policy, i.e.. a policy
where no regions exist that are both executable and writable at the same
time.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
This commit is contained in:
Ard Biesheuvel 2017-02-23 10:36:38 +00:00
parent f31c36c293
commit 973e388af2
1 changed files with 32 additions and 0 deletions
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32
MdeModulePkg/MdeModulePkg.dec
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@ -1107,6 +1107,38 @@
# @ValidRange 0x80000002 | 0x00000000 - 0x0000001F
gEfiMdeModulePkgTokenSpaceGuid.PcdImageProtectionPolicy|0x00000002|UINT32|0x00001047
## Set DXE memory protection policy. The policy is bitwise.
# If a bit is set, memory regions of the associated type will be mapped
# non-executable.<BR><BR>
#
# Below is bit mask for this PCD: (Order is same as UEFI spec)<BR>
# EfiReservedMemoryType 0x0001<BR>
# EfiLoaderCode 0x0002<BR>
# EfiLoaderData 0x0004<BR>
# EfiBootServicesCode 0x0008<BR>
# EfiBootServicesData 0x0010<BR>
# EfiRuntimeServicesCode 0x0020<BR>
# EfiRuntimeServicesData 0x0040<BR>
# EfiConventionalMemory 0x0080<BR>
# EfiUnusableMemory 0x0100<BR>
# EfiACPIReclaimMemory 0x0200<BR>
# EfiACPIMemoryNVS 0x0400<BR>
# EfiMemoryMappedIO 0x0800<BR>
# EfiMemoryMappedIOPortSpace 0x1000<BR>
# EfiPalCode 0x2000<BR>
# EfiPersistentMemory 0x4000<BR>
# OEM Reserved 0x4000000000000000<BR>
# OS Reserved 0x8000000000000000<BR>
#
# NOTE: User must NOT set NX protection for EfiLoaderCode / EfiBootServicesCode / EfiRuntimeServicesCode. <BR>
# User MUST set the same NX protection for EfiBootServicesData and EfiConventionalMemory. <BR>
#
# e.g. 0x7FD5 can be used for all memory except Code. <BR>
# e.g. 0x7BD4 can be used for all memory except Code and ACPINVS/Reserved. <BR>
#
# @Prompt Set DXE memory protection policy.
gEfiMdeModulePkgTokenSpaceGuid.PcdDxeNxMemoryProtectionPolicy|0x0000000|UINT64|0x00001048
## PCI Serial Device Info. It is an array of Device, Function, and Power Management
# information that describes the path that contains zero or more PCI to PCI briges
# followed by a PCI serial device. Each array entry is 4-bytes in length. The