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From: tip-bot for Alexey Dobriyan <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: mingo@kernel.org, tglx@linutronix.de, luto@kernel.org,
	peterz@infradead.org, jpoimboe@redhat.com, adobriyan@gmail.com,
	torvalds@linux-foundation.org, dvlasenk@redhat.com,
	linux-kernel@vger.kernel.org, h.peter.anvin@intel.com,
	bp@alien8.de, brgerst@gmail.com, hpa@zytor.com
Subject: [tip:x86/pti] x86/asm: Pad assembly functions with INT3 instructions
Date: Mon, 14 May 2018 05:53:19 -0700	[thread overview]
Message-ID: <tip-51bad67ffbce0aaa44579f84ef5d05597054ec6a@git.kernel.org> (raw)
In-Reply-To: <20180507213755.GA32406@avx2>

Commit-ID:  51bad67ffbce0aaa44579f84ef5d05597054ec6a
Gitweb:     https://git.kernel.org/tip/51bad67ffbce0aaa44579f84ef5d05597054ec6a
Author:     Alexey Dobriyan <adobriyan@gmail.com>
AuthorDate: Tue, 8 May 2018 00:37:55 +0300
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Mon, 14 May 2018 11:43:03 +0200

x86/asm: Pad assembly functions with INT3 instructions

Use INT3 instead of NOP. All that padding between functions is
an illegal area, no legitimate code should jump into it.

I've checked x86_64 allyesconfig disassembly, all changes looks sane:
INT3 is only used after RET or unconditional JMP.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: H. Peter Anvin <h.peter.anvin@intel.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180507213755.GA32406@avx2
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/include/asm/linkage.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/linkage.h b/arch/x86/include/asm/linkage.h
index 14caa9d9fb7f..c0b70bc1e659 100644
--- a/arch/x86/include/asm/linkage.h
+++ b/arch/x86/include/asm/linkage.h
@@ -18,7 +18,7 @@
 	name:
 
 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_ALIGNMENT_16)
-#define __ALIGN		.p2align 4, 0x90
+#define __ALIGN		.p2align 4, 0xCC
 #define __ALIGN_STR	__stringify(__ALIGN)
 #endif
 

  parent reply	other threads:[~2018-05-14 12:54 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-07 21:37 [PATCH] x86: pad assembly functions with INT3 Alexey Dobriyan
2018-05-07 21:41 ` hpa
2018-05-09 16:55   ` Alexey Dobriyan
2018-05-09 19:28     ` H. Peter Anvin
2018-05-10 16:39 ` David Laight
2018-05-11 18:53   ` H. Peter Anvin
2018-05-14  9:04     ` David Laight
2018-05-14 11:05       ` hpa
2018-05-15  6:54         ` Ingo Molnar
2018-05-15  6:59           ` hpa
2018-05-14 12:53 ` tip-bot for Alexey Dobriyan [this message]
2018-06-17 11:40   ` [tip:x86/pti] x86/asm: Pad assembly functions with INT3 instructions Mike Galbraith
2018-06-17 12:00     ` Borislav Petkov
2018-06-17 13:38       ` Mike Galbraith
2018-06-17 14:02         ` Mike Galbraith
2018-06-17 19:47           ` Borislav Petkov
2018-06-18  2:34             ` Mike Galbraith
2018-06-23 10:36               ` [PATCH] x86/crypto: Add missing RETs Borislav Petkov
2018-06-23 17:30                 ` Ondrej Mosnáček
2018-06-24  7:11                 ` Ingo Molnar
2018-06-24  7:12                   ` Thomas Gleixner
2018-06-24 10:15                     ` Borislav Petkov
2018-06-24 10:44                   ` Alexey Dobriyan
2018-06-25  7:24                     ` Ingo Molnar
2018-06-25 13:19                       ` Josh Poimboeuf
2018-06-26  6:49                         ` Ingo Molnar
2018-06-26 12:31                           ` Josh Poimboeuf
2018-07-05  7:58                             ` Ingo Molnar
2018-07-06 14:06                               ` Josh Poimboeuf
2018-07-06 14:57                                 ` Ingo Molnar
2018-07-01 13:19                 ` Herbert Xu
2018-07-01 15:24                   ` Ondrej Mosnáček
2018-07-01 15:45                     ` Herbert Xu
2018-06-19 11:27         ` [tip:x86/pti] x86/asm: Pad assembly functions with INT3 instructions David Laight

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