linux-kernel - Re: [PATCH] sg, bsg: mitigate read/write abuse, block uaccess in release

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Message-ID: <20180711063307.GA31127@infradead.org>
Date:   Tue, 10 Jul 2018 23:33:07 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Jann Horn <jannh@...gle.com>
Cc:     Christoph Hellwig <hch@...radead.org>, axboe@...nel.dk,
        Douglas Gilbert <dgilbert@...erlog.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        fujita.tomonori@....ntt.co.jp, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com, linux-block@...r.kernel.org,
        linux-scsi@...r.kernel.org,
        kernel list <linux-kernel@...r.kernel.org>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        security@...nel.org
Subject: Re: [PATCH] sg, bsg: mitigate read/write abuse, block uaccess in
 release

On Tue, Jul 10, 2018 at 01:53:02PM -0700, Jann Horn wrote:
> With the error messages like in my sg patch or like with Linus'
> proposed patch (https://lore.kernel.org/lkml/CA+55aFwg-2GP4ASTdd1pusmZkF7c8AN9febVDCaioDxzYJSLfw@mail.gmail.com/)
> applied?

I guess we should follows Linus' suggestions.

Note that he also seems to agree with me to just remove the read/write
interface.  Compared to sg bsg really is unused for the read/write
interface.  But lets get your fix in first..