linux-kernel - Re: usercopy whitelist woe in scsi_sense

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Message-ID: <7fc01f67a561ce1fad676fc34c2249e7@natalenko.name>
Date:   Thu, 05 Apr 2018 11:56:06 +0200
From:   Oleksandr Natalenko <oleksandr@...alenko.name>
To:     Kees Cook <keescook@...omium.org>
Cc:     David Windsor <dave@...lcore.net>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        keescook@...gle.com
Subject: Re: usercopy whitelist woe in scsi_sense_cache

Hi.

04.04.2018 23:25, Kees Cook wrote:
> Thanks for the report! I hope someone more familiar with sg_io() can
> help explain the changing buffer offset... :P

Also, FYI, I kept the server running with smartctl periodically invoked, 
and it was still triggering BUGs, however, I consider them to be more or 
less harmless until the server got stuck with high I/O wait this morning 
after next smartctl invocation. So, it isn't harmless, it seems…

It could be unrelated, of course, since the journal didn't give me any 
hint (or a stack trace) on what happened, thus I'll monitor how things 
behave without smartctl too.

Regards,
   Oleksandr