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From: Thomas Garnier <thgarnie@chromium.org>
To: kernel-hardening@lists.openwall.com
Cc: kristen@linux.intel.com, keescook@chromium.org,
	Thomas Garnier <thgarnie@chromium.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	x86@kernel.org, Allison Randal <allison@lohutok.net>,
	Enrico Weigelt <info@metux.net>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jiri Slaby <jslaby@suse.cz>,
	linux-kernel@vger.kernel.org
Subject: [PATCH v11 03/11] x86: relocate_kernel - Adapt assembly for PIE support
Date: Thu, 27 Feb 2020 16:00:48 -0800	[thread overview]
Message-ID: <20200228000105.165012-4-thgarnie@chromium.org> (raw)
In-Reply-To: <20200228000105.165012-1-thgarnie@chromium.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@chromium.org>
Reviewed-by: Kees Cook <keescook@chromium.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 ef3ba99068d3..c294339df5ef 100644
--- a/arch/x86/kernel/relocate_kernel_64.S
+++ b/arch/x86/kernel/relocate_kernel_64.S
@@ -206,7 +206,7 @@ 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
 	ret
 SYM_CODE_END(identity_mapped)
-- 
2.25.1.481.gfbce0eb801-goog


  parent reply	other threads:[~2020-02-28  0:01 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-28  0:00 [PATCH v11 00/11] x86: PIE support to extend KASLR randomization Thomas Garnier
2020-02-28  0:00 ` [PATCH v11 01/11] x86/crypto: Adapt assembly for PIE support Thomas Garnier
2020-02-28  0:00 ` [PATCH v11 02/11] x86: Add macro to get symbol address " Thomas Garnier
2020-02-28  0:00 ` Thomas Garnier [this message]
2020-02-28  0:00 ` [PATCH v11 04/11] x86/entry/64: Adapt assembly " Thomas Garnier
2020-02-28  0:00 ` [PATCH v11 05/11] x86: pm-trace - " Thomas Garnier
2020-02-28  0:00 ` [PATCH v11 06/11] x86/CPU: " Thomas Garnier
2020-03-03  4:58   ` Kees Cook
2020-02-28  0:00 ` [PATCH v11 07/11] x86/acpi: " Thomas Garnier
2020-02-28  0:00 ` [PATCH v11 08/11] x86/boot/64: " Thomas Garnier
2020-02-28  0:00 ` [PATCH v11 09/11] x86/power/64: " Thomas Garnier
2020-02-28  0:00 ` [PATCH v11 10/11] x86/paravirt: " Thomas Garnier
2020-02-28  0:00 ` [PATCH v11 11/11] x86/alternatives: " Thomas Garnier
2020-03-03  4:59   ` Kees Cook
2020-03-03  5:02 ` [PATCH v11 00/11] x86: PIE support to extend KASLR randomization Kees Cook
2020-03-03  9:55   ` Peter Zijlstra
2020-03-03 15:43     ` Thomas Garnier
2020-03-03 21:01       ` Kristen Carlson Accardi
2020-03-03 21:19         ` Kees Cook
2020-03-04  9:21           ` Peter Zijlstra
2020-03-04 18:21             ` Kees Cook
2020-03-04 18:44               ` H. Peter Anvin
2020-03-04 19:19                 ` Thomas Garnier
2020-03-04 19:22                   ` H. Peter Anvin
2020-03-04  9:40           ` H. Peter Anvin

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