linux-kernel - [PATCH] x86/entry/64: Fix warning on compat syscalls with CONFIG

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Date:	Tue,  7 Jul 2015 10:55:28 -0700
From:	Andy Lutomirski <luto@...nel.org>
To:	x86@...nel.org, linux-kernel@...r.kernel.org
Cc:	Borislav Petkov <bp@...en8.de>, Andy Lutomirski <luto@...nel.org>
Subject: [PATCH] x86/entry/64: Fix 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

Fixes: 29ea1b258b98 ("x86/entry/64: Migrate 64-bit and compat syscalls to the new exit handlers and remove old assembly code")
Signed-off-by: Andy Lutomirski <luto@...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 25aca51a6324..d7571532e7ce 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)
-- 
2.4.3

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