linux-kernel - [tip:x86/asm] x86/entry/64: Fix IRQ state confusion and related warning on compat syscalls with CONFIG

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Message-ID: <tip-8f7f06b87acd2e017d6c536f59e10045dd8d0578@git.kernel.org>
Date:	Wed, 8 Jul 2015 12:12:40 -0700
From:	tip-bot for Andy Lutomirski <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	luto@...nel.org, hpa@...or.com, mingo@...nel.org,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	tglx@...utronix.de, brgerst@...il.com, luto@...capital.net,
	dvlasenk@...hat.com, bp@...en8.de, peterz@...radead.org
Subject: [tip:x86/asm] x86/entry/64:
  Fix IRQ state confusion and related warning on compat syscalls with CONFIG_AUDITSYSCALL
 =n

Commit-ID:  8f7f06b87acd2e017d6c536f59e10045dd8d0578
Gitweb:     http://git.kernel.org/tip/8f7f06b87acd2e017d6c536f59e10045dd8d0578
Author:     Andy Lutomirski <luto@...nel.org>
AuthorDate: Tue, 7 Jul 2015 10:55:28 -0700
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 8 Jul 2015 21:10:25 +0200

x86/entry/64: Fix IRQ state confusion and related warning on compat syscalls with CONFIG_AUDITSYSCALL=n

int_ret_from_sys_call now expects IRQs to be enabled.  I got
this right in the real sysexit_audit and sysretl_audit asm
paths, but I missed it in the #defined-away versions when
CONFIG_AUDITSYSCALL=n.  This is a straightforward fix for
CONFIG_AUDITSYSCALL=n

Signed-off-by: Andy Lutomirski <luto@...nel.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Fixes: 29ea1b258b98 ("x86/entry/64: Migrate 64-bit and compat syscalls to the new exit handlers and remove old assembly code")
Link: http://lkml.kernel.org/r/25cf0a01e01c6008118dd8f8d9f043020416700c.1436291493.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/entry/entry_64_compat.S | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/x86/entry/entry_64_compat.S b/arch/x86/entry/entry_64_compat.S
index 25aca51..d757153 100644
--- a/arch/x86/entry/entry_64_compat.S
+++ b/arch/x86/entry/entry_64_compat.S
@@ -22,8 +22,8 @@
 #define __AUDIT_ARCH_LE		0x40000000
 
 #ifndef CONFIG_AUDITSYSCALL
-# define sysexit_audit		ia32_ret_from_sys_call
-# define sysretl_audit		ia32_ret_from_sys_call
+# define sysexit_audit		ia32_ret_from_sys_call_irqs_off
+# define sysretl_audit		ia32_ret_from_sys_call_irqs_off
 #endif
 
 	.section .entry.text, "ax"
@@ -466,6 +466,10 @@ ia32_badarg:
 	/* And exit again. */
 	jmp retint_user
 
+ia32_ret_from_sys_call_irqs_off:
+	TRACE_IRQS_ON
+	ENABLE_INTERRUPTS(CLBR_NONE)
+
 ia32_ret_from_sys_call:
 	xorl	%eax, %eax		/* Do not leak kernel information */
 	movq	%rax, R11(%rsp)
--
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