linux-kernel - Re: [PATCH] rds: Make rds_message_copy_from

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Date:	Thu, 5 Feb 2015 17:07:34 -0500
From:	Sowmini Varadhan <sowmini.varadhan@...cle.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	chien.yen@...cle.com, davem@...emloft.net,
	rds-devel@....oracle.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rds: Make rds_message_copy_from_user() return 0 on
 success.

On (02/05/15 21:58), Al Viro wrote:
> *blink*
> 
> Commit 083735f4b0 ("rds: switch rds_message_copy_from_user() to iov_iter"),
> surely?  That's the one that touches copy-from side of things...
> 
> And unlike the previous commit (the one you'd mentioned) here the return value
> of copy_page_....() ended up passed to caller of its caller.  Mea culpa.
> 
> So, modulo correction of the commit message,
> 
> Acked-by: Al Viro <viro@...iv.linux.org.uk>

That was the one that git-bisect flagged for me.. I think this one
had the iov_iter_init() in rds_sendmsg() itself? As I recall, this 
change was already refactoring rds_message_copy_from_user() (and was the
earliest version that was broken when I tested it)?

should it have been 'put iov_iter into msghdr'? I just wanted
to make sure some innocent user would know how far back to go,
if they wanted to not trip on this one.

--Sowmini

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