linux-kernel - do_execve() needs const qualifiers (was Re: [patch 3/3] uml: fix warnings in kernel

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Message-ID: <20090401161114.GF3848@hack>
Date:	Thu, 2 Apr 2009 00:11:14 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	user-mode-linux-devel@...ts.sourceforge.net, jdike@...toit.com,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	viro@...iv.linux.org.uk
Subject: do_execve() needs const qualifiers (was Re: [patch 3/3] uml: fix
	warnings in kernel_execve)

On Mon, Mar 30, 2009 at 08:45:12PM +0200, Miklos Szeredi wrote:
>From: Miklos Szeredi <mszeredi@...e.cz>
>
>Fix the following warnings:
>
>arch/um/kernel/syscall.c: In function 'kernel_execve':
>arch/um/kernel/syscall.c:130: warning: passing argument 1 of 'um_execve' discards qualifiers from pointer target type
>arch/um/kernel/syscall.c:130: warning: passing argument 2 of 'um_execve' discards qualifiers from pointer target type
>arch/um/kernel/syscall.c:130: warning: passing argument 3 of 'um_execve' discards qualifiers from pointer target type
>
>Signed-off-by: Miklos Szeredi <mszeredi@...e.cz>
>---
> arch/um/kernel/syscall.c |    3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
>Index: linux-2.6/arch/um/kernel/syscall.c
>===================================================================
>--- linux-2.6.orig/arch/um/kernel/syscall.c	2009-03-30 20:25:17.000000000 +0200
>+++ linux-2.6/arch/um/kernel/syscall.c	2009-03-30 20:36:20.000000000 +0200
>@@ -127,7 +127,8 @@ int kernel_execve(const char *filename,
> 
> 	fs = get_fs();
> 	set_fs(KERNEL_DS);
>-	ret = um_execve(filename, argv, envp);
>+	ret = um_execve((char *)filename, (char __user *__user *)argv,
>+			(char __user *__user *) envp);

Well... I found this many days ago and I did a similar fix.

However, I think this doesn't fix the real problem. The real problem
is do_execve() doesn't have the correct const qualifiers, I am queueing
a huge patch to fix all the 'const' issues from do_execve() and more,
but I don't if Al would like it or not.

So let's Cc Al to see his advice.

Thanks.


-- 
Do what you love, f**k the rest! F**k the regulations!
 
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