linux-kernel - Re: Reiserfs.c bug in 3.2-rc5

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Date:	Tue, 3 Jan 2012 11:17:18 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:	Jan Kara <jack@...e.cz>, linux-kernel@...r.kernel.org,
	reiserfs-devel@...r.kernel.org, haiyangz@...rosoft.com,
	hjanssen@...rosoft.com, "Rafael J. Wysocki" <rjw@...k.pl>,
	James Morris <jmorris@...ei.org>,
	Jorge Bastos <mysql.jorge@...imal.pt>,
	Mark Fasheh <mfasheh@...e.com>,
	Joel Becker <jlbec@...lplan.org>
Subject: Re: Reiserfs.c bug in 3.2-rc5

On Tue, Jan 3, 2012 at 10:45 AM, Mimi Zohar <zohar@...ux.vnet.ibm.com> wrote:
>
> Just clarifying not all of commit fb88c2b, but only the
> security_old_inode_init_security() hunk.

Is it really sane to have different semantics like that for the
security[_old]_inode_init_security functions?

Look at ocfs2, for example: it does nothing if
ocfs2_init_security_get() returns 0. That does not sound like the
correct thing to do, when the fallback is to do ocfs2_init_acl() under
the lock.

And ocfs2_init_security_get() just calls either
security_inode_init_security() or security_old_inode_init_security()
depending on whether ocfs2_security_xattr_info is NULL or not. So I
really think callers expect the same kind of semantics regardless of
whether it's the "old" or not version. Which would make sense anyway.

Also, the *documentation* in include/linux/security.h very much says
that it returns 0 only if @name and @value have been successfully set.
So my gut feel says that both security_inode_init_security and
security_old_inode_init_security should return -EOPNOTSUPP (although
the "new" version doesn't really have "name/value", so maybe returning
0 is ok)

Anyway, I'd love for (multiple) people who really know the code to
give me a clean agreement on exactly what the correct patch is.
Please?

                                 Linus
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