From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-x235.google.com (mail-wm0-x235.google.com [IPv6:2a00:1450:400c:c09::235]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 4651E82101 for ; Sun, 26 Feb 2017 10:30:48 -0800 (PST) Received: by mail-wm0-x235.google.com with SMTP id u199so3625762wmd.1 for ; Sun, 26 Feb 2017 10:30:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=nCdhTcCKbliJdQVn0VcXSzR8JrRq35TZZR1qi7UOEpE=; b=ThGRyh2UtYxnsiYq37U6Hpr95woUs+aT3HSw4zTM+f1sMRGHVnJQYc0V234+Vq56uX TrybrMH82jjOgbVXFLRMMKVk8r7HPdd6v7StniefAAcslQwjudNumyCp0izIMa937muC BTSmLG7Tagbwdb2HmFaiexkslB7/GgYQ6O4to= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=nCdhTcCKbliJdQVn0VcXSzR8JrRq35TZZR1qi7UOEpE=; b=uXfcJhSytl/ItiZImQJ1YRux0I/t+c2nGwdu8TLqvg8DVtN7YhiW0oHBKm5ab6hLD4 GO9FjFu9/igY/idC5zhSy8VNudjIQcWfw8xcnsHqZFBOdNEAYed0jD73JP/kb1FOojg/ z54Uec/kUxNiygtU5y7y+YE4fKYi6OAWqkaYXs/Tlbcq9AE4ZPGBlCzTCgKjezH8TV5b jAtGibDPZmzaS1qdjpop1gmuiARWw9g0uZCpMFlnLTJGKZfNUBfakcpFWo6k5ONlQpfc 3Zdnr3EP9FLL5sRabrVNu7shBUek1qwCbZz+zc3kd7IQah2Vqazk18xBLl4vJj/6/1QN jeYA== X-Gm-Message-State: AMke39mOxfICZwjW+YIeswGxb+WikbXBkqwVRRWsn2OzlHwYMTyPL9jk8Tb3AXZD3SlYIaTY X-Received: by 10.28.144.135 with SMTP id s129mr10451360wmd.18.1488133846776; Sun, 26 Feb 2017 10:30:46 -0800 (PST) Received: from localhost.localdomain ([105.149.201.216]) by smtp.gmail.com with ESMTPSA id s103sm4499474wrc.6.2017.02.26.10.30.43 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Sun, 26 Feb 2017 10:30:45 -0800 (PST) From: Ard Biesheuvel To: edk2-devel@lists.01.org, jiewen.yao@intel.com, leif.lindholm@linaro.org Cc: afish@apple.com, michael.d.kinney@intel.com, liming.gao@Intel.com, lersek@redhat.com, feng.tian@intel.com, star.zeng@intel.com, Ard Biesheuvel Date: Sun, 26 Feb 2017 18:30:04 +0000 Message-Id: <1488133805-4773-6-git-send-email-ard.biesheuvel@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1488133805-4773-1-git-send-email-ard.biesheuvel@linaro.org> References: <1488133805-4773-1-git-send-email-ard.biesheuvel@linaro.org> Subject: [PATCH v3 5/6] MdeModulePkg: define PCD for DXE memory protection policy X-BeenThere: edk2-devel@lists.01.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: EDK II Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 26 Feb 2017 18:30:48 -0000 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 --- MdeModulePkg/MdeModulePkg.dec | 31 ++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec index 426634fbbd4d..fb6a39c9e354 100644 --- a/MdeModulePkg/MdeModulePkg.dec +++ b/MdeModulePkg/MdeModulePkg.dec @@ -1107,6 +1107,37 @@ [PcdsFixedAtBuild, PcdsPatchableInModule] # @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.

+ # + # Below is bit mask for this PCD: (Order is same as UEFI spec)
+ # EfiReservedMemoryType 0x0001
+ # EfiLoaderCode 0x0002
+ # EfiLoaderData 0x0004
+ # EfiBootServicesCode 0x0008
+ # EfiBootServicesData 0x0010
+ # EfiRuntimeServicesCode 0x0020
+ # EfiRuntimeServicesData 0x0040
+ # EfiConventionalMemory 0x0080
+ # EfiUnusableMemory 0x0100
+ # EfiACPIReclaimMemory 0x0200
+ # EfiACPIMemoryNVS 0x0400
+ # EfiMemoryMappedIO 0x0800
+ # EfiMemoryMappedIOPortSpace 0x1000
+ # EfiPalCode 0x2000
+ # EfiPersistentMemory 0x4000
+ # OEM Reserved 0x4000000000000000
+ # OS Reserved 0x8000000000000000
+ # + # NOTE: User must NOT set NX protection for EfiLoaderCode / EfiBootServicesCode / EfiRuntimeServicesCode.
+ # + # e.g. 0x7FD5 can be used for all memory except Code.
+ # e.g. 0x7BD4 can be used for all memory except Code and ACPINVS/Reserved.
+ # + # @Prompt Set DXE memory protection policy. + gEfiMdeModulePkgTokenSpaceGuid.PcdDxeMemoryProtectionPolicy|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 -- 2.7.4