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From: Evgeniy Baskov <baskov@ispras.ru>
To: Borislav Petkov <bp@alien8.de>
Cc: Evgeniy Baskov <baskov@ispras.ru>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Ingo Molnar <mingo@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Andy Lutomirski <luto@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>, x86@kernel.org,
        linux-kernel@vger.kernel.org,
        Alexey Khoroshilov <khoroshilov@ispras.ru>
Subject: [PATCH 2/8] x86/build: Remove RWX sections and align on 4KB
Date: Mon,  1 Aug 2022 19:38:59 +0300
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 <b8be83a2b27ebf47dc15e650787de01fe277ad83.1659369873.git.baskov@ispras.ru>
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Avoid creating sections with maximal privileges to prepare for W^X
implementation. Align sections on page size (4KB) to allow protecting
them in page table.

Signed-off-by: Evgeniy Baskov <baskov@ispras.ru>

diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 15f29053cec4..6587e0201b50 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -102,12 +102,11 @@ jiffies =3D jiffies_64;
 PHDRS {
 	text PT_LOAD FLAGS(5);          /* R_E */
 	data PT_LOAD FLAGS(6);          /* RW_ */
-#ifdef CONFIG_X86_64
-#ifdef CONFIG_SMP
+#if defined(CONFIG_X86_64) && defined(CONFIG_SMP)
 	percpu PT_LOAD FLAGS(6);        /* RW_ */
 #endif
-	init PT_LOAD FLAGS(7);          /* RWE */
-#endif
+	inittext PT_LOAD FLAGS(5);      /* R_E */
+	init PT_LOAD FLAGS(6);          /* RW_ */
 	note PT_NOTE FLAGS(0);          /* ___ */
 }
=20
@@ -226,9 +225,10 @@ SECTIONS
 #endif
=20
 	INIT_TEXT_SECTION(PAGE_SIZE)
-#ifdef CONFIG_X86_64
-	:init
-#endif
+	:inittext
+
+	. =3D ALIGN(PAGE_SIZE);
+
=20
 	/*
 	 * Section for code used exclusively before alternatives are run. All
@@ -240,6 +240,7 @@ SECTIONS
 	.altinstr_aux : AT(ADDR(.altinstr_aux) - LOAD_OFFSET) {
 		*(.altinstr_aux)
 	}
+	:init
=20
 	INIT_DATA_SECTION(16)
=20
--=20
2.35.1