linux-kernel - Re: UBIFS with dma on 4.6 kernel is not working

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: <20161021131505.GA25942@infradead.org>
Date:   Fri, 21 Oct 2016 06:15:05 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Richard Weinberger <richard@....at>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Naga Sureshkumar Relli <naga.sureshkumar.relli@...inx.com>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "computersforpeace@...il.com" <computersforpeace@...il.com>,
        "dedekind1@...il.com" <dedekind1@...il.com>,
        "adrian.hunter@...el.com" <adrian.hunter@...el.com>,
        "michal.simek@...inx.com" <michal.simek@...inx.com>,
        Punnaiah Choudary Kalluri <punnaia@...inx.com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>
Subject: Re: UBIFS with dma on 4.6 kernel is not working

On Fri, Oct 21, 2016 at 03:07:57PM +0200, Richard Weinberger wrote:
> Hmm, thought this is still problematic on VIVT architectures.
> Boris tried to provide a solution for that some time ago:
> http://www.spinics.net/lists/arm-kernel/msg494025.html

Things have been working fine for approx 10 years when using
flush_kernel_vmap_range before doing I/O using the physical addresses and
then invalidate_kernel_vmap_range when completing the I/O and going back
to using the virtual mapping for XFS.

Of course all this assumes at least the higher level that did the
vm_map_ram operation knows about this dance between virtually mapped and
physiscal addresses.