linux-kernel - Re: [patch] fix sys_mknodat breakage from r/o bind mounts

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Message-ID: <20070926150345.GA24744@infradead.org>
Date:	Wed, 26 Sep 2007 16:03:45 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	haveblue@...ibm.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] fix sys_mknodat breakage from r/o bind mounts

On Wed, Sep 26, 2007 at 12:58:47AM +0200, Miklos Szeredi wrote:
>  	if (!S_ISREG(mode)  && !S_ISCHR(mode)  && !S_ISBLK(mode) &&
> -	    !S_ISFIFO(mode) && !S_ISSOCK(mode) && mode != 0) {
> +	    !S_ISFIFO(mode) && !S_ISSOCK(mode) && (mode & S_IFMT) != 0) {

FYI this whole section might be cleaner as


static int may_mknod(mode_t mode)
{
	switch (mode & S_IFMT) {
	case S_IFREG:
	case S_IFCHR:
	case S_IFBLK:
	case S_IFFIFO:
	case S_IFSOCK:
	case 0:	/* zero mode translates to S_IFREG *
		return 0;
	case S_IFDIR:
		return -EPERM;
	default:
		return -EINVAL;
	}
}

and then in sys_mknodat just a

	error = may_mknod(mode);
	if (error)
		goto out_dput;

-
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