[ 3.5.y.z extended stable ] Patch "x86-64: Replace left over sti/cli in ia32 audit exit code" has been added to staging queue

Herton Ronaldo Krzesinski herton.krzesinski at canonical.com
Tue Feb 12 21:18:28 UTC 2013


This is a note to let you know that I have just added a patch titled

    x86-64: Replace left over sti/cli in ia32 audit exit code

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Herton

------

>From e0bda8e4d1ca06bc26da907c2ded4406a58a4ba2 Mon Sep 17 00:00:00 2001
From: Jan Beulich <JBeulich at suse.com>
Date: Wed, 30 Jan 2013 07:55:53 +0000
Subject: [PATCH] x86-64: Replace left over sti/cli in ia32 audit exit code

commit 40a1ef95da85843696fc3ebe5fce39b0db32669f upstream.

For some reason they didn't get replaced so far by their
paravirt equivalents, resulting in code to be run with
interrupts disabled that doesn't expect so (causing, in the
observed case, a BUG_ON() to trigger) when syscall auditing is
enabled.

David (Cc-ed) came up with an identical fix, so likely this can
be taken to count as an ack from him.

Reported-by: Peter Moody <pmoody at google.com>
Signed-off-by: Jan Beulich <jbeulich at suse.com>
Cc: David Vrabel <david.vrabel at citrix.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk at oracle.com>
Link: http://lkml.kernel.org/r/5108E01902000078000BA9C5@nat28.tlf.novell.com
Signed-off-by: Ingo Molnar <mingo at kernel.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk at oracle.com>
Cc: David Vrabel <david.vrabel at citrix.com>
Tested-by: Peter Moody <pmoody at google.com>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>
---
 arch/x86/ia32/ia32entry.S |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S
index 20e5f7b..f6d477a 100644
--- a/arch/x86/ia32/ia32entry.S
+++ b/arch/x86/ia32/ia32entry.S
@@ -204,7 +204,7 @@ sysexit_from_sys_call:
 	testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET)
 	jnz ia32_ret_from_sys_call
 	TRACE_IRQS_ON
-	sti
+	ENABLE_INTERRUPTS(CLBR_NONE)
 	movl %eax,%esi		/* second arg, syscall return value */
 	cmpl $-MAX_ERRNO,%eax	/* is it an error ? */
 	jbe 1f
@@ -214,7 +214,7 @@ sysexit_from_sys_call:
 	call __audit_syscall_exit
 	movq RAX-ARGOFFSET(%rsp),%rax	/* reload syscall return value */
 	movl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),%edi
-	cli
+	DISABLE_INTERRUPTS(CLBR_NONE)
 	TRACE_IRQS_OFF
 	testl %edi,TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET)
 	jz \exit
--
1.7.9.5





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