linux-kernel - Re: [patch 06/14] hfsplus: remove hfsplus

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Date:	Thu, 22 May 2008 14:02:31 +0200 (CEST)
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	Miklos Szeredi <miklos@...redi.hu>
cc:	linux-fsdevel@...r.kernel.org, hch@...radead.org,
	viro@...IV.linux.org.uk, linux-kernel@...r.kernel.org
Subject: Re: [patch 06/14] hfsplus: remove hfsplus_permission()

Hi,

On Thu, 22 May 2008, Miklos Szeredi wrote:

> > No, it's not, it allows for HFS+ specific special case to allow the lookup 
> > of the resource fork.
> 
> Sorry I just don't see how that code would allow anything.  The only
> place hfsplus_permission() is called is from permission() in namei.c,
> and in that case it _is_ equivalent.  Look:
> 
> hfsplus_permission():
> 
> 	if (S_ISREG(inode->i_mode) && mask & MAY_EXEC && !(inode->i_mode & 0111))
> 		return 0;
> 
> permission():
> 
> 		retval = inode->i_op->permission(inode, submask, nd);
> 		if (!retval) {
> 			/*
> 			 * Exec permission on a regular file is denied if none
> 			 * of the execute bits are set.
> 			 *
> 			 * This check should be done by the ->permission()
> 			 * method.
> 			 */
> 			if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode) &&
> 			    !(inode->i_mode & S_IXUGO))
> 				return -EACCES;

That check didn't used to be there and that the HFS+ check is older than 
that might have given you the idea that it at least used to work.
So now the only way for a fs to differentiate between lookup and exec is 
gone... :-(

bye, Roman
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