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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, linux-kernel@vger.kernel.org
Subject: [PATCH v10 05/11] x86: pm-trace - Adapt assembly for PIE support
Date: Wed,  4 Dec 2019 16:09:42 -0800
Message-ID: <20191205000957.112719-6-thgarnie@chromium.org> (raw)
In-Reply-To: <20191205000957.112719-1-thgarnie@chromium.org>

Change assembly to use the new _ASM_MOVABS macro instead of _ASM_MOV for
the assembly to be PIE compatible.

Position Independent Executable (PIE) support will allow to extend the
KASLR randomization range below 0xffffffff80000000.

Signed-off-by: Thomas Garnier <thgarnie@chromium.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
---
 arch/x86/include/asm/pm-trace.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/pm-trace.h b/arch/x86/include/asm/pm-trace.h
index bfa32aa428e5..972070806ce9 100644
--- a/arch/x86/include/asm/pm-trace.h
+++ b/arch/x86/include/asm/pm-trace.h
@@ -8,7 +8,7 @@
 do {								\
 	if (pm_trace_enabled) {					\
 		const void *tracedata;				\
-		asm volatile(_ASM_MOV " $1f,%0\n"		\
+		asm volatile(_ASM_MOVABS " $1f,%0\n"		\
 			     ".section .tracedata,\"a\"\n"	\
 			     "1:\t.word %c1\n\t"		\
 			     _ASM_PTR " %c2\n"			\
-- 
2.24.0.393.g34dc348eaf-goog


  parent reply index

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-05  0:09 [PATCH v10 00/11] x86: PIE support to extend KASLR randomization Thomas Garnier
2019-12-05  0:09 ` [PATCH v10 01/11] x86/crypto: Adapt assembly for PIE support Thomas Garnier
2019-12-05  0:09 ` [PATCH v10 02/11] x86: Add macro to get symbol address " Thomas Garnier
2019-12-05  0:09 ` [PATCH v10 03/11] x86: relocate_kernel - Adapt assembly " Thomas Garnier
2019-12-05  0:09 ` [PATCH v10 04/11] x86/entry/64: " Thomas Garnier
2019-12-05  9:03   ` Peter Zijlstra
2019-12-05 17:01     ` Thomas Garnier
2019-12-06 10:26       ` Peter Zijlstra
2019-12-06 16:35         ` Thomas Garnier
2019-12-05  0:09 ` Thomas Garnier [this message]
2019-12-05  0:09 ` [PATCH v10 06/11] x86/CPU: " Thomas Garnier
2019-12-05  0:09 ` [PATCH v10 07/11] x86/acpi: " Thomas Garnier
2019-12-05  0:09 ` [PATCH v10 08/11] x86/boot/64: " Thomas Garnier
2019-12-05  0:09 ` [PATCH v10 09/11] x86/power/64: " Thomas Garnier
2019-12-05  0:09 ` [PATCH v10 10/11] x86/paravirt: " Thomas Garnier
2019-12-05  0:09 ` [PATCH v10 11/11] x86/alternatives: " Thomas Garnier

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