linux-kernel - Re: [PATCH v5 4/5] fs, xfs: introduce MAP_DIRECT for creating block-map-atomic file ranges

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: <CAPcyv4iFzbVMgEJen--QNnFH7uuU7PWCV6S9c3fPwDMrr3iZjA@mail.gmail.com>
Date:   Wed, 16 Aug 2017 09:29:24 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, Jan Kara <jack@...e.cz>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Linux API <linux-api@...r.kernel.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        Dave Chinner <david@...morbit.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-xfs@...r.kernel.org, Linux MM <linux-mm@...ck.org>,
        Jeff Moyer <jmoyer@...hat.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andy Lutomirski <luto@...nel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v5 4/5] fs, xfs: introduce MAP_DIRECT for creating
 block-map-atomic file ranges

On Wed, Aug 16, 2017 at 4:12 AM, Kirill A. Shutemov
<kirill@...temov.name> wrote:
> On Wed, Aug 16, 2017 at 12:44:28AM -0700, Dan Williams wrote:
>> @@ -1411,6 +1422,9 @@ unsigned long do_mmap(struct file *file, unsigned long addr,
>>
>>                       /* fall through */
>>               case MAP_PRIVATE:
>> +                     if ((flags & (MAP_PRIVATE|MAP_DIRECT))
>> +                                     == (MAP_PRIVATE|MAP_DIRECT))
>> +                             return -EINVAL;
>
> We've already checked for MAP_PRIVATE in this codepath. Simple (flags &
> MAP_DIRECT) would be enough.

True, willl fix.