On Wed, Mar 27, 2013, at 20:46, Al Viro wrote:
> On Wed, Mar 27, 2013 at 08:31:02PM +0100, Alexander van Heukelum wrote:
> > Hi Al,
> >
> > Hans de Bruin found a regression due to one of your changes. I asked him to
> > test a fix and he reported back that it worked. (Thanks!) Can you see if
> > you agree with the fix? Patch is attached due to webmail...
>
> Use SYSCALL_DEFINE{1,2} for vm86_old and vm86, please.
Like this?
Greetings,
Alexander
From 450d86e6ad0a7d387cf706714c1fc030bb4b13a5 Mon Sep 17 00:00:00 2001
From: Alexander van Heukelum <heuke...@fastmail.fm>
Date: Tue, 26 Mar 2013 21:57:43 +0100
Subject: [PATCH] x86, vm86: fix VM86 syscalls: use SYSCALL_DEFINEx(...)
Commit 49cb25e9290 x86: 'get rid of pt_regs argument in vm86/vm86old'
got rid of the pt_regs stub for sys_vm86old and sys_vm86. The functions
were, however, not changed to use the calling convention for syscalls.
[v2] Use SYSCALL_DEFINEx(...). Compiles to identical code.
The regression was reported and pinpointed by Hans de Bruin:
> commit 49cb25e9290 x86: 'get rid of pt_regs argument in vm86/vm86old'
> somehow breaks the colors when I play 'civilization I' under xdosemu.
> During the intro of the game something the colors get messed up. When
> the game begins the grass of the earth is red. Reverting the commit
> fixes the problem.
And he tested the patch too:
> Yep, the grass is green again.
Reported-and-tested-by: Hans de Bruin <jmdebr...@xmsnet.nl>
Signed-off-by: Alexander van Heukelum <heuke...@fastmail.fm>
---
arch/x86/include/asm/syscalls.h | 4 ++--
arch/x86/kernel/vm86_32.c | 8 +++++---
2 files changed, 7 insertions(+), 5 deletions(-)
diff --git a/arch/x86/include/asm/syscalls.h b/arch/x86/include/asm/syscalls.h
index 6cf0a9c..5a0be0a 100644
--- a/arch/x86/include/asm/syscalls.h
+++ b/arch/x86/include/asm/syscalls.h
@@ -37,8 +37,8 @@ asmlinkage int sys_get_thread_area(struct user_desc __user *);
unsigned long sys_sigreturn(void);
/* kernel/vm86_32.c */
-int sys_vm86old(struct vm86_struct __user *);
-int sys_vm86(unsigned long, unsigned long);
+asmlinkage long sys_vm86old(struct vm86_struct __user *);
+asmlinkage long sys_vm86(unsigned long, unsigned long);
#else /* CONFIG_X86_32 */
diff --git a/arch/x86/kernel/vm86_32.c b/arch/x86/kernel/vm86_32.c
index 1cf5766..a67cb2b 100644
--- a/arch/x86/kernel/vm86_32.c
+++ b/arch/x86/kernel/vm86_32.c
@@ -33,6 +33,7 @@
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
+#include <linux/syscalls.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/signal.h>
@@ -48,7 +49,6 @@
#include <asm/io.h>
#include <asm/tlbflush.h>
#include <asm/irq.h>
-#include <asm/syscalls.h>
/*
* Known problems:
@@ -202,7 +202,7 @@ out:
static int do_vm86_irq_handling(int subfunction, int irqnumber);
static void do_sys_vm86(struct kernel_vm86_struct *info, struct task_struct *tsk);
-int sys_vm86old(struct vm86_struct __user *v86)
+SYSCALL_DEFINE1(vm86old, struct vm86_struct __user *, v86)
{
struct kernel_vm86_struct info; /* declare this _on top_,
* this avoids wasting of stack space.
@@ -227,11 +227,12 @@ int sys_vm86old(struct vm86_struct __user *v86)
do_sys_vm86(&info, tsk);
ret = 0; /* we never return here */
out:
+ asmlinkage_protect(1, ret, v86);
return ret;
}
-int sys_vm86(unsigned long cmd, unsigned long arg)
+SYSCALL_DEFINE2(vm86, unsigned long, cmd, unsigned long, arg)
{
struct kernel_vm86_struct info; /* declare this _on top_,
* this avoids wasting of stack space.
@@ -278,6 +279,7 @@ int sys_vm86(unsigned long cmd, unsigned long arg)
do_sys_vm86(&info, tsk);
ret = 0; /* we never return here */
out:
+ asmlinkage_protect(2, ret, cmd, arg);
return ret;
}
--
1.8.1.2
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