linux-kernel - [PATCH RFC 26/43] x86/pie: Add .data.rel.* sections into link script

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Message-Id: <d32ccd92c2042e6b7abc4f7519d47a1d92383026.1682673543.git.houwenlong.hwl@antgroup.com>
Date:   Fri, 28 Apr 2023 17:51:06 +0800
From:   "Hou Wenlong" <houwenlong.hwl@...group.com>
To:     linux-kernel@...r.kernel.org
Cc:     "Thomas Garnier" <thgarnie@...omium.org>,
        "Lai Jiangshan" <jiangshan.ljs@...group.com>,
        "Kees Cook" <keescook@...omium.org>,
        "Hou Wenlong" <houwenlong.hwl@...group.com>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        "Ingo Molnar" <mingo@...hat.com>, "Borislav Petkov" <bp@...en8.de>,
        "Dave Hansen" <dave.hansen@...ux.intel.com>, <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "Josh Poimboeuf" <jpoimboe@...nel.org>,
        "Juergen Gross" <jgross@...e.com>,
        "Brian Gerst" <brgerst@...il.com>
Subject: [PATCH RFC 26/43] x86/pie: Add .data.rel.* sections into link script

The .data.rel.local and .data.rel.ro.local sections are generated when
PIE is enabled, merge them into .data section, since no dynamic loader
is used.

Signed-off-by: Hou Wenlong <houwenlong.hwl@...group.com>
Cc: Thomas Garnier <thgarnie@...omium.org>
Cc: Lai Jiangshan <jiangshan.ljs@...group.com>
Cc: Kees Cook <keescook@...omium.org>
---
 arch/x86/kernel/vmlinux.lds.S | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index fa4c6582663f..71e0769d2b52 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -177,6 +177,10 @@ SECTIONS
 		/* rarely changed data like cpu maps */
 		READ_MOSTLY_DATA(INTERNODE_CACHE_BYTES)
 
+#ifdef CONFIG_X86_PIE
+		*(.data.rel)
+		*(.data.rel.*)
+#endif
 		/* End of data section */
 		_edata = .;
 	} :data
-- 
2.31.1