linux-hardening - [PATCH 01/16] x86/boot: Align vmlinuz sections on page size

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Message-Id: <27a078f43742063cc30e706b196fb5fff5d5c37e.1662459668.git.baskov@ispras.ru>
Date:   Tue,  6 Sep 2022 13:41:05 +0300
From:   Evgeniy Baskov <baskov@...ras.ru>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     Evgeniy Baskov <baskov@...ras.ru>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Alexey Khoroshilov <khoroshilov@...ras.ru>,
        lvc-project@...uxtesting.org, x86@...nel.org,
        linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: [PATCH 01/16] x86/boot: Align vmlinuz sections on page size

To protect sections on page table level each section
needs to be aligned on page size (4KB).

Set sections alignment in linker script.

Signed-off-by: Evgeniy Baskov <baskov@...ras.ru>
---
 arch/x86/boot/compressed/vmlinux.lds.S | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/boot/compressed/vmlinux.lds.S b/arch/x86/boot/compressed/vmlinux.lds.S
index 112b2375d021..6be90f1a1198 100644
--- a/arch/x86/boot/compressed/vmlinux.lds.S
+++ b/arch/x86/boot/compressed/vmlinux.lds.S
@@ -27,21 +27,27 @@ SECTIONS
 		HEAD_TEXT
 		_ehead = . ;
 	}
+	. = ALIGN(PAGE_SIZE);
 	.rodata..compressed : {
+		_compressed = .;
 		*(.rodata..compressed)
+		_ecompressed = .;
 	}
+	. = ALIGN(PAGE_SIZE);
 	.text :	{
 		_text = .; 	/* Text */
 		*(.text)
 		*(.text.*)
 		_etext = . ;
 	}
+	. = ALIGN(PAGE_SIZE);
 	.rodata : {
 		_rodata = . ;
 		*(.rodata)	 /* read-only data */
 		*(.rodata.*)
 		_erodata = . ;
 	}
+	. = ALIGN(PAGE_SIZE);
 	.data :	{
 		_data = . ;
 		*(.data)
-- 
2.35.1