2018-01-06 14:13:39 +00:00
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From 2b0f4b4c0431f0e68a01a51b889c7935f6920765 Mon Sep 17 00:00:00 2001
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From: Andy Lutomirski <luto@kernel.org>
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Date: Mon, 4 Dec 2017 15:07:10 +0100
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2018-01-08 09:25:09 +00:00
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Subject: [PATCH 140/241] x86/irq: Remove an old outdated comment about context
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2018-01-06 14:13:39 +00:00
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tracking races
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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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That race has been fixed and code cleaned up for a while now.
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Signed-off-by: Andy Lutomirski <luto@kernel.org>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Reviewed-by: Borislav Petkov <bp@suse.de>
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Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
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Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
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Cc: Borislav Petkov <bp@alien8.de>
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Cc: Borislav Petkov <bpetkov@suse.de>
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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: Dave Hansen <dave.hansen@linux.intel.com>
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Cc: David Laight <David.Laight@aculab.com>
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Cc: Denys Vlasenko <dvlasenk@redhat.com>
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Cc: Eduardo Valentin <eduval@amazon.com>
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Cc: Greg KH <gregkh@linuxfoundation.org>
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Cc: H. Peter Anvin <hpa@zytor.com>
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Cc: Josh Poimboeuf <jpoimboe@redhat.com>
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Cc: Juergen Gross <jgross@suse.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: Rik van Riel <riel@redhat.com>
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Cc: Will Deacon <will.deacon@arm.com>
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Cc: aliguori@amazon.com
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Cc: daniel.gruss@iaik.tugraz.at
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Cc: hughd@google.com
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Cc: keescook@google.com
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Link: https://lkml.kernel.org/r/20171204150605.150551639@linutronix.de
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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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(cherry picked from commit 6669a692605547892a026445e460bf233958bd7f)
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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 7344db7580965d6f9994b6d7b1a74206d7635565)
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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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---
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arch/x86/kernel/irq.c | 12 ------------
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1 file changed, 12 deletions(-)
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diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
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index 4ed0aba8dbc8..a84142a910f3 100644
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--- a/arch/x86/kernel/irq.c
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+++ b/arch/x86/kernel/irq.c
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@@ -222,18 +222,6 @@ __visible unsigned int __irq_entry do_IRQ(struct pt_regs *regs)
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/* high bit used in ret_from_ code */
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unsigned vector = ~regs->orig_ax;
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- /*
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- * NB: Unlike exception entries, IRQ entries do not reliably
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- * handle context tracking in the low-level entry code. This is
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- * because syscall entries execute briefly with IRQs on before
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- * updating context tracking state, so we can take an IRQ from
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- * kernel mode with CONTEXT_USER. The low-level entry code only
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- * updates the context if we came from user mode, so we won't
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- * switch to CONTEXT_KERNEL. We'll fix that once the syscall
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- * code is cleaned up enough that we can cleanly defer enabling
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- * IRQs.
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- */
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-
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entering_irq();
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/* entering_irq() tells RCU that we're not quiescent. Check it. */
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--
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2.14.2
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