linux-kernel - Re: [PATCH AUTOSEL 4.19 02/12] loop: use sysfs

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Date:   Mon, 28 Mar 2022 04:44:44 -0700
From:   Joe Perches <joe@...ches.com>
To:     Sasha Levin <sashal@...nel.org>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Cc:     Chaitanya Kulkarni <kch@...dia.com>,
        Himanshu Madhani <himanshu.madhani@...cle.com>,
        Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 4.19 02/12] loop: use sysfs_emit() in the sysfs
 xxx show()

On Mon, 2022-03-28 at 07:24 -0400, Sasha Levin wrote:
> From: Chaitanya Kulkarni <kch@...dia.com>
> 
> [ Upstream commit b27824d31f09ea7b4a6ba2c1b18bd328df3e8bed ]
> 
> sprintf does not know the PAGE_SIZE maximum of the temporary buffer
> used for outputting sysfs content and it's possible to overrun the
> PAGE_SIZE buffer length.

IMOP This isn't something that should be backported.