linux-kernel - Re: Is read barrier missed in kfifo?

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1526023986.28429.1.camel@seibold.net>
Date:   Fri, 11 May 2018 09:33:06 +0200
From:   Stefani Seibold <stefani@...bold.net>
To:     Xiao Guangrong <guangrong.xiao@...il.com>,
        paulmck@...ux.vnet.ibm.com
Cc:     peterz@...radead.org, rostedt@...dmis.org,
        Lai Jiangshan <jiangshanlai@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Is read barrier missed in kfifo?

My guts thinks you are right. Feel free to send a patch...

Am Freitag, den 11.05.2018, 15:25 +0800 schrieb Xiao Guangrong:
> Hi,
> 
> Currently, there is no read barrier between reading the index
> (kfifo.in) and fetching the real data from the fifo.
> 
> I am afraid that will cause the vfifo is observed as not empty
> however the data is not actually ready for read. Right?
> 
> Thanks!