From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail02.groups.io (mail02.groups.io [66.175.222.108]) by spool.mail.gandi.net (Postfix) with ESMTPS id 76EEA940F1E for ; Wed, 20 Sep 2023 00:58:12 +0000 (UTC) DKIM-Signature: a=rsa-sha256; bh=+iiBySghzgjiXq9b/ZaTuit7rkEq4s7jmvljf9z3CGI=; c=relaxed/simple; d=groups.io; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:MIME-Version:Precedence:List-Subscribe:List-Help:Sender:List-Id:Mailing-List:Delivered-To:Reply-To:List-Unsubscribe-Post:List-Unsubscribe:Content-Transfer-Encoding; s=20140610; t=1695171491; v=1; b=M1enoamNyX2KeAUeHyDaRhjNjveGqvox1rfmnJ49i6qP7NL+x58zD9pATTaPkc5AvCBJxnlK dWjShoySbPo/Jrul5CYzgT+ceEVL4uMtUFMAG3sShLfqoqVoSytJ2CC+RATe5Ejee9iczEpPj+g +w+uGMCRzkjgH6VAdtqgmxEc= X-Received: by 127.0.0.2 with SMTP id xoYQYY7687511xsJyVLE0r8i; Tue, 19 Sep 2023 17:58:11 -0700 X-Received: from mail-pl1-f171.google.com (mail-pl1-f171.google.com [209.85.214.171]) by mx.groups.io with SMTP id smtpd.web10.26779.1695171488848256323 for ; Tue, 19 Sep 2023 17:58:08 -0700 X-Received: by mail-pl1-f171.google.com with SMTP id d9443c01a7336-1c465d59719so25654895ad.1 for ; Tue, 19 Sep 2023 17:58:08 -0700 (PDT) X-Gm-Message-State: QOUzPsR4N9NWkj2sEu7hEs9Vx7686176AA= X-Google-Smtp-Source: AGHT+IHD+ku1Zc7AKW0mhv5UzjL+9jxclRmds2Itgd1kHy1ilPUT91HFj4o5DwAZpmyH50g+0UESRw== X-Received: by 2002:a17:903:1cb:b0:1b7:e86f:7631 with SMTP id e11-20020a17090301cb00b001b7e86f7631mr1198343plh.19.1695171488217; Tue, 19 Sep 2023 17:58:08 -0700 (PDT) X-Received: from localhost.localdomain ([50.46.253.1]) by smtp.gmail.com with ESMTPSA id 13-20020a170902c24d00b001bb988ac243sm10563576plg.297.2023.09.19.17.58.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 Sep 2023 17:58:07 -0700 (PDT) From: "Taylor Beebe" To: devel@edk2.groups.io Cc: Jian J Wang , Liming Gao , Dandan Bi Subject: [edk2-devel] [PATCH v4 06/28] MdeModulePkg: Apply Protections to the HOB List Date: Tue, 19 Sep 2023 17:57:29 -0700 Message-ID: <20230920005752.2041-7-taylor.d.beebe@gmail.com> In-Reply-To: <20230920005752.2041-1-taylor.d.beebe@gmail.com> References: <20230920005752.2041-1-taylor.d.beebe@gmail.com> MIME-Version: 1.0 Precedence: Bulk List-Subscribe: List-Help: Sender: devel@edk2.groups.io List-Id: Mailing-List: list devel@edk2.groups.io; contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,taylor.d.beebe@gmail.com List-Unsubscribe-Post: List-Unsubscribe=One-Click List-Unsubscribe: Content-Transfer-Encoding: 8bit X-GND-Status: LEGIT Authentication-Results: spool.mail.gandi.net; dkim=pass header.d=groups.io header.s=20140610 header.b=M1enoamN; dmarc=fail reason="SPF not aligned (relaxed), DKIM not aligned (relaxed)" header.from=gmail.com (policy=none); spf=pass (spool.mail.gandi.net: domain of bounce@groups.io designates 66.175.222.108 as permitted sender) smtp.mailfrom=bounce@groups.io Because the platform memory protection settings will be stored in the HOB, the HOB list should be marked read-only and non-executable as soon as possible in boot. This patch page-aligns the allocated HOB list in DXE and marks it RO/NX during memory protection initialization. Signed-off-by: Taylor Beebe Cc: Jian J Wang Cc: Liming Gao Cc: Dandan Bi --- MdeModulePkg/Core/Dxe/Gcd/Gcd.c | 18 ++++++------ MdeModulePkg/Core/Dxe/Misc/MemoryProtection.c | 29 ++++++++++++++++++++ 2 files changed, 38 insertions(+), 9 deletions(-) diff --git a/MdeModulePkg/Core/Dxe/Gcd/Gcd.c b/MdeModulePkg/Core/Dxe/Gcd/Gcd.c index 792cd2e0af23..72bd036eab1e 100644 --- a/MdeModulePkg/Core/Dxe/Gcd/Gcd.c +++ b/MdeModulePkg/Core/Dxe/Gcd/Gcd.c @@ -2764,21 +2764,21 @@ CoreInitializeGcdServices ( } // - // Relocate HOB List to an allocated pool buffer. + // Relocate HOB List to allocated pages. // The relocation should be at after all the tested memory resources added // (except the memory space that covers HOB List) to the memory services, // because the memory resource found in CoreInitializeMemoryServices() // may have not enough remaining resource for HOB List. // - NewHobList = AllocateCopyPool ( - (UINTN)PhitHob->EfiFreeMemoryBottom - (UINTN)(*HobStart), - *HobStart - ); - ASSERT (NewHobList != NULL); - - *HobStart = NewHobList; - gHobList = NewHobList; + NewHobList = AllocatePages (EFI_SIZE_TO_PAGES ((UINTN)PhitHob->EfiFreeMemoryBottom - (UINTN)(*HobStart))); + if (NewHobList != NULL) { + CopyMem (NewHobList, *HobStart, (UINTN)PhitHob->EfiFreeMemoryBottom - (UINTN)(*HobStart)); + *HobStart = NewHobList; + } else { + ASSERT (NewHobList != NULL); + } + gHobList = *HobStart; if (MemorySpaceMapHobList != NULL) { // // Add and allocate the memory space that covers HOB List to the memory services diff --git a/MdeModulePkg/Core/Dxe/Misc/MemoryProtection.c b/MdeModulePkg/Core/Dxe/Misc/MemoryProtection.c index 7cc829b17402..94ed3111688b 100644 --- a/MdeModulePkg/Core/Dxe/Misc/MemoryProtection.c +++ b/MdeModulePkg/Core/Dxe/Misc/MemoryProtection.c @@ -967,6 +967,32 @@ InitializeDxeNxMemoryProtectionPolicy ( } } +/** + Mark the HOB list as read-only and non-executable. +**/ +STATIC +VOID +ProtectHobList ( + VOID + ) +{ + EFI_PEI_HOB_POINTERS Hob; + + Hob.Raw = GetHobList (); + + // Find the end of the HOB list. + while (!END_OF_HOB_LIST (Hob)) { + Hob.Raw = GET_NEXT_HOB (Hob); + } + + // Protect the HOB list. + SetUefiImageMemoryAttributes ( + (UINTN)gHobList, + ALIGN_VALUE (((UINTN)Hob.Raw + GET_HOB_LENGTH (Hob)) - (UINTN)GetHobList (), EFI_PAGE_SIZE), + EFI_MEMORY_XP | EFI_MEMORY_RO + ); +} + /** A notification for CPU_ARCH protocol. @@ -1007,6 +1033,9 @@ MemoryProtectionCpuArchProtocolNotify ( // HeapGuardCpuArchProtocolNotify (); + // Mark the HOB list XP and RO. + ProtectHobList (); + if (mImageProtectionPolicy == 0) { goto Done; } -- 2.42.0.windows.2 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. 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