linux-kernel - Re: [PATCH 0/3] HID: debug: fix the ring buffer implementation

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Message-ID: <nycvar.YFH.7.76.1810261724510.23511@cbobk.fhfr.pm>
Date:   Fri, 26 Oct 2018 17:25:21 +0200 (CEST)
From:   Jiri Kosina <jikos@...nel.org>
To:     Vladis Dronov <vdronov@...hat.com>
cc:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] HID: debug: fix the ring buffer implementation

On Wed, 3 Oct 2018, Vladis Dronov wrote:

> This patchset is fixing some aspects of the ring buffer implementation in
> drivers/hid/hid-debug.c. This implementation has certain problem points:
> 
> - it may stuck in an infinite loop
> - it may return corrupted data
> - a reader and a writer are not protected by spinlocks, which can lead to
>   the corrupted data
> 
> The suggested patchset is a new ring buffer implementation which overwrites
> the oldest data in case of an overflow. One can verify the suggested ring
> buffer implementation by fuzzing it with modified kernel and fuzzer-reader
> at: https://gist.github.com/nefigtut/33d56e3870b67493cc867344aed2a062

Vladis,

thanks for cleaning it up. I actually like your rewrite quite a lot.

Quick question -- how well was it tested in which scenarios?

-- 
Jiri Kosina
SUSE Labs