linux-kernel - Re: [net-next PATCH v4 1/3] sysctl: refactor integer handling proc code

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Message-Id: <201002161341.56206.opurdila@ixiacom.com>
Date:	Tue, 16 Feb 2010 13:41:56 +0200
From:	Octavian Purdila <opurdila@...acom.com>
To:	Cong Wang <amwang@...hat.com>
Cc:	David Miller <davem@...emloft.net>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Linux Kernel Developers <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [net-next PATCH v4 1/3] sysctl: refactor integer handling proc code

On Tuesday 16 February 2010 10:41:07 you wrote:

> > +static int proc_skip_wspace(char __user **buf, size_t *size)
> > +{
> > +     char c;
> > +
> > +     while (*size) {
> > +             if (get_user(c, *buf))
> > +                     return -EFAULT;
> > +             if (!isspace(c))
> > +                     break;
> > +             (*size)--; (*buf)++;
> > +     }
> > +
> > +     return 0;
> > +}
> 
> In lib/string.c we have skip_spaces(), I think we can use it
> here instead of inventing another one.
> 

I'm afraid we can't, skip_spaces does not accept userspace buffers.
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