58 lines
1.8 KiB
Diff
58 lines
1.8 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Borislav Petkov <bp@suse.de>
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Date: Thu, 2 Nov 2017 13:09:26 +0100
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Subject: [PATCH] x86/entry/64: Shorten TEST instructions
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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CVE-2017-5754
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Convert TESTL to TESTB and save 3 bytes per callsite.
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No functionality change.
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Signed-off-by: Borislav Petkov <bp@suse.de>
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Cc: Andy Lutomirski <luto@kernel.org>
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Cc: Brian Gerst <brgerst@gmail.com>
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Cc: Dave Hansen <dave.hansen@intel.com>
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Cc: Linus Torvalds <torvalds@linux-foundation.org>
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Cc: Peter Zijlstra <peterz@infradead.org>
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Cc: Thomas Gleixner <tglx@linutronix.de>
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Link: http://lkml.kernel.org/r/20171102120926.4srwerqrr7g72e2k@pd.tnic
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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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(cherry picked from commit 1e4c4f610f774df6088d7c065b2dd4d22adba698)
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Signed-off-by: Andy Whitcroft <apw@canonical.com>
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Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
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(cherry picked from commit 2b5cfca36261d4ce45ebfdf2602d65201fa3c780)
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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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---
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arch/x86/entry/entry_64.S | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
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index 05501c781c20..2491b3b25b9a 100644
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--- a/arch/x86/entry/entry_64.S
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+++ b/arch/x86/entry/entry_64.S
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@@ -620,7 +620,7 @@ GLOBAL(retint_user)
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GLOBAL(swapgs_restore_regs_and_return_to_usermode)
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#ifdef CONFIG_DEBUG_ENTRY
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/* Assert that pt_regs indicates user mode. */
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- testl $3, CS(%rsp)
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+ testb $3, CS(%rsp)
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jnz 1f
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ud2
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1:
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@@ -653,7 +653,7 @@ retint_kernel:
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GLOBAL(restore_regs_and_return_to_kernel)
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#ifdef CONFIG_DEBUG_ENTRY
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/* Assert that pt_regs indicates kernel mode. */
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- testl $3, CS(%rsp)
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+ testb $3, CS(%rsp)
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jz 1f
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ud2
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1:
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--
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2.14.2
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