linux-kernel - [PATCH RFC 03/43] x86: relocate_kernel

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Message-Id: <bc0448bb462b50934978fc4858088b69f57f193b.1682673543.git.houwenlong.hwl@antgroup.com>
Date:   Fri, 28 Apr 2023 17:50:43 +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 (Intel)" <peterz@...radead.org>,
        "Alexandre Chartre" <alexandre.chartre@...cle.com>,
        "Josh Poimboeuf" <jpoimboe@...nel.org>,
        "Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>
Subject: [PATCH RFC 03/43] x86: relocate_kernel - Adapt assembly for PIE support

From: Thomas Garnier <thgarnie@...omium.org>

From: Thomas Garnier <thgarnie@...omium.org>

Change the assembly code to use only absolute references of symbols for the
kernel to be PIE compatible.

Signed-off-by: Thomas Garnier <thgarnie@...omium.org>
Signed-off-by: Hou Wenlong <houwenlong.hwl@...group.com>
Cc: Lai Jiangshan <jiangshan.ljs@...group.com>
Cc: Kees Cook <keescook@...omium.org>
---
 arch/x86/kernel/relocate_kernel_64.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/relocate_kernel_64.S b/arch/x86/kernel/relocate_kernel_64.S
index 56cab1bb25f5..05d916e9df47 100644
--- a/arch/x86/kernel/relocate_kernel_64.S
+++ b/arch/x86/kernel/relocate_kernel_64.S
@@ -223,7 +223,7 @@ SYM_CODE_START_LOCAL_NOALIGN(identity_mapped)
 	movq	%rax, %cr3
 	lea	PAGE_SIZE(%r8), %rsp
 	call	swap_pages
-	movq	$virtual_mapped, %rax
+	movabsq	$virtual_mapped, %rax
 	pushq	%rax
 	ANNOTATE_UNRET_SAFE
 	ret
-- 
2.31.1