linux-kernel - Re: [parch 4/4] vfs: utimensat(): fix write access check for futimens()

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Message-Id: <E1K3lxO-0007t2-2d@pomaz-ex.szeredi.hu>
Date:	Wed, 04 Jun 2008 07:54:46 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	mtk.manpages@...glemail.com
CC:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	hch@....de, miklos@...redi.hu, viro@...iv.linux.org.uk,
	jamie@...reable.org, drepper@...hat.com,
	linux-fsdevel@...r.kernel.org, subrata@...ux.vnet.ibm.com
Subject: Re: [parch 4/4] vfs: utimensat(): fix write access check for futimens()

> At which point the "if (f)" and the "else" branches become equivalent
> (the nameidata isn't interesting in the other case either).  So that
> could be written as:
> 
> 		if (!is_owner_or_cap(inode)) {
> 			error = permission(inode, MAY_WRITE, NULL);
> 			if (error)
> 				goto mnt_drop_write_and_out;
> 		}

And also the IS_IMMUTABLE() check can be removed, since it's checked
by permission(MAY_WRITE) anyway.

Miklos
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