linux-kernel - Re: [v1] iov_iter: fix page_copy

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Message-ID: <502375193.icN6k8xHrH@tjmaciei-mobl1>
Date:   Sat, 30 Sep 2017 12:24:42 -0700
From:   Thiago Macieira <thiago.macieira@...el.com>
To:     Petar Penkov <ppenkov@...gle.com>
CC:     <linux-kernel@...r.kernel.org>, Al Viro <viro@...iv.linux.org.uk>,
        "Eric Dumazet" <edumazet@...gle.com>
Subject: Re: [v1] iov_iter: fix page_copy_sane for compound pages

On Tuesday, 29 August 2017 11:20:32 PDT Petar Penkov wrote:
> Issue is that if the data crosses a page boundary inside a compound
> page, this check will incorrectly trigger a WARN_ON.
> 
> To fix this, compute the order using the head of the compound page and
> adjust the offset to be relative to that head.
> 
> Fixes: 72e809ed81ed ("iov_iter: sanity checks for copy to/from page
> primitives")

Hello

Is this patch slated to end up in one of the 4.13.x updates? It landed on 
v4.14-rc2 already but seems to have missed the 4.13.3 and 4.13.4 tagging.

Without this patch, I can't connect any USB Ethernet or the kernel will start 
producing that WARN_ON message and returning -EFAULT for quite a few programs.

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
   Software Architect - Intel Open Source Technology Center