From: Lionel Sambuc <lionel@minix3.org>
Date: Fri, 31 Oct 2014 21:40:23 +0000 (+0100)
Subject: Fix iopl flag when sysenter/exit are used
X-Git-Url: http://zhaoyanbai.com/repos/?a=commitdiff_plain;h=refs%2Fchanges%2F66%2F2866%2F1;p=minix.git

Fix iopl flag when sysenter/exit are used

Change-Id: If8c12f987c3adb8f329ae163da6b2f1cb8cc772f
---

diff --git a/minix/kernel/arch/i386/mpx.S b/minix/kernel/arch/i386/mpx.S
index 4617bfdc2..81fb696a3 100644
--- a/minix/kernel/arch/i386/mpx.S
+++ b/minix/kernel/arch/i386/mpx.S
@@ -402,7 +402,12 @@ ENTRY(restore_user_context_sysenter)
 	mov	SPREG(%ebp), %ecx	/* sysexit restores ESP using ECX */
 	mov	AXREG(%ebp), %eax	/* trap return value */
 	mov	BXREG(%ebp), %ebx	/* secondary return value */
-	movl	PSWREG(%ebp), %edi	/* load desired PSW to EDI */
+
+        /* restore PSW */
+        movl    PSWREG(%ebp), %edi      /* load desired PSW to EDI */
+        push    %edi
+        popf
+
 	sti				/* enable interrupts */
 	sysexit				/* jump to EIP in user */