linux-kernel - Re: [PATCH V4 2/2] blktrace: allow access trace file in lockdown mode

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Date:   Tue, 25 Apr 2023 13:12:36 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Junxiao Bi <junxiao.bi@...cle.com>, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-block@...r.kernel.org
Cc:     paul@...l-moore.com, nathanl@...ux.ibm.com, jmorris@...ei.org,
        serge@...lyn.com, konrad.wilk@...cle.com, joe.jin@...cle.com
Subject: Re: [PATCH V4 2/2] blktrace: allow access trace file in lockdown mode

On 4/25/23 11:55?AM, Junxiao Bi wrote:
> Any IO folks can help review this patch?
> 
> Paul needs a confirm from you that the information blktrace exporting
> to userspace through the relay files are safe, not leaking information
> that userspace shouldn't know in lockdown mode.

I don't know anything about what lockdown is, but in terms of blktrace,
it is a way to trace meta data associated with IO. It'll tell you things
like "task T wants to {read,write} on device D, at offset X, and of size
Y". For passthrough IO, it'll also dump the CDB. There's never any
actual data traced.

-- 
Jens Axboe