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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, Andy Lutomirski <luto@kernel.org>,
	"Peter Zijlstra (Intel)" <peterz@infradead.org>,
	Len Brown <len.brown@intel.com>,
	linux-kernel@vger.kernel.org
Subject: [PATCH v11 06/11] x86/CPU: Adapt assembly for PIE support
Date: Thu, 27 Feb 2020 16:00:51 -0800	[thread overview]
Message-ID: <20200228000105.165012-7-thgarnie@chromium.org> (raw)
In-Reply-To: <20200228000105.165012-1-thgarnie@chromium.org>

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

Signed-off-by: Thomas Garnier <thgarnie@chromium.org>
---
 arch/x86/include/asm/processor.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 09705ccc393c..fdf6366c482d 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -746,11 +746,13 @@ static inline void sync_core(void)
 		"pushfq\n\t"
 		"mov %%cs, %0\n\t"
 		"pushq %q0\n\t"
-		"pushq $1f\n\t"
+		"leaq 1f(%%rip), %q0\n\t"
+		"pushq %q0\n\t"
 		"iretq\n\t"
 		UNWIND_HINT_RESTORE
 		"1:"
-		: "=&r" (tmp), ASM_CALL_CONSTRAINT : : "cc", "memory");
+		: "=&r" (tmp), ASM_CALL_CONSTRAINT
+		: : "cc", "memory");
 #endif
 }
 
-- 
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 ` [PATCH v11 03/11] x86: relocate_kernel - Adapt assembly " Thomas Garnier
2020-02-28  0:00 ` [PATCH v11 04/11] x86/entry/64: " Thomas Garnier
2020-02-28  0:00 ` [PATCH v11 05/11] x86: pm-trace - " Thomas Garnier
2020-02-28  0:00 ` Thomas Garnier [this message]
2020-03-03  4:58   ` [PATCH v11 06/11] x86/CPU: " 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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