linux-kernel - Re: [PATCH 15/18] blktrace: change strncpy+truncation to strlcpy

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Date:   Fri, 15 Mar 2019 08:29:31 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Dominique Martinet <asmadeus@...ewreck.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 15/18] blktrace: change strncpy+truncation to strlcpy

On 3/15/19 12:30 AM, Dominique Martinet wrote:
> Jens, Steven,
> 
> Jens Axboe wrote on Thu, Mar 14, 2019:
>> On 3/14/19 7:37 PM, Steven Rostedt wrote:
>>> I noticed this old patch in my inbox. It looks like a legit cleanup.
>>> Want to take it?
>>
>> Indeed, I've applied it. Thanks!
> 
> Thanks. I am terribly sorry about this patch series to be honest, I did
> not prepare it properly and sent too many generic patches at once but
> more importantly some were unsafe (strlcpy expects the input string to
> be validly formatted, because it basically does strlen() on it to check
> how much hasn't been copied for its return value)
> I was pointed out strscpy instead as a safer alternative.
> 
> In this case `name` comes from bdevname() which is disk_name() in
> block/partition-generic.c which is a snprintf, so we are guaranted
> null truncation from there and it should be OK, but I wanted to check
> and point it out.

Dropped.

-- 
Jens Axboe