linux-kernel - Re: [PATCH] Revert "zram: convert remaining CLASS_ATTR() to CLASS_ATTR

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Date:   Wed, 17 Jun 2020 13:36:31 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Steffen Maier <maier@...ux.ibm.com>
Cc:     Minchan Kim <minchan@...nel.org>, Nitin Gupta <ngupta@...are.org>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wade Mealing <wmealing@...hat.com>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH] Revert "zram: convert remaining CLASS_ATTR() to
 CLASS_ATTR_RO()"

On Wed, Jun 17, 2020 at 01:05:54PM +0200, Steffen Maier wrote:
> On 6/17/20 12:34 PM, Greg Kroah-Hartman wrote:
> > From: Wade Mealing <wmealing@...hat.com>
> > 
> > Turns out that the permissions for 0400 really are what we want here,
> > otherwise any user can write to this file.
> 
> Minor confusion on my side:
> Did you mean "read from" instead of "write to"?
> I.e. only owner may read but not group nor others.
> Whereas using CLASS_ATTR_RO would resolve into 0444.

Sorry, you are correct, I'll fix the changelog text and send this out
again.

It's a "fun" file, reading from it causes something to happen, not the
normal way things work :(

greg k-h