Re: opening symlinks with O_CREAT under latest 2.5.74

[Petr Vandrovec]

On Mon, Jul 07, 2003 at 09:30:34PM +0200, Trond Myklebust wrote:
> >>>>> " " == Petr Vandrovec <[e-mail]> writes:
> 
>      > Hi,
>      >   couple of things stopped working on my box
>      > where I have /dev/vc/XX as symlinks to /dev/ttyXX, and some
>      > things use /dev/vc/XX and some /dev/ttyXX. After last update
>      > hour ago things which use /dev/vc/XX stopped working for
>      > non-root - they now fail with EACCES error if they attempt to
>      > redirect its input or output through '>' or '<>' bash
>      > redirection operators:
> 
> Whoops. Looks like I missed an assumption in open_namei().
> Does the following patch fix the problem?

Yes, it fixes problem. Thanks,
						Petr Vandrovec

> Cheers,
>   Trond
> 
> --- linux-2.5.74-up/fs/namei.c.orig	2003-06-30 08:49:25.000000000 +0200
> +++ linux-2.5.74-up/fs/namei.c	2003-07-07 21:25:00.000000000 +0200
> @@ -1344,6 +1344,7 @@
>  	 * stored in nd->last.name and we will have to putname() it when we
>  	 * are done. Procfs-like symlinks just set LAST_BIND.
>  	 */
> +	nd->flags |= LOOKUP_PARENT;
>  	error = security_inode_follow_link(dentry, nd);
>  	if (error)
>  		goto exit_dput;
> @@ -1352,6 +1353,7 @@
>  	dput(dentry);
>  	if (error)
>  		return error;
> +	nd->flags &= ~LOOKUP_PARENT;
>  	if (nd->last_type == LAST_BIND) {
>  		dentry = nd->dentry;
>  		goto ok;
> -
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