linux-kernel - Re: [PATCH] virtio-console: avoid DMA from vmalloc area

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]

Date:   Wed, 28 Jul 2021 11:01:17 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Xianting Tian <xianting.tian@...ux.alibaba.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Amit Shah <amit@...nel.org>,
        gregkh <gregkh@...uxfoundation.org>,
        Omar Sandoval <osandov@...com>,
        "open list:DRM DRIVER FOR QEMU'S CIRRUS DEVICE" 
        <virtualization@...ts.linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH] virtio-console: avoid DMA from vmalloc area

On Wed, Jul 28, 2021 at 10:28 AM Xianting Tian
<xianting.tian@...ux.alibaba.com> wrote:
> 在 2021/7/28 下午3:25, Arnd Bergmann 写道:
>
> I checked several hvc backends, like drivers/tty/hvc/hvc_riscv_sbi.c,
> drivers/tty/hvc/hvc_iucv.c, drivers/tty/hvc/hvc_rtas.c, they don't use dma.
>
> I not finished all hvc backends check yet. But I think even if all hvc
> backends don't use dma currently, it is still possible that the hvc
> backend using dma will be added in the furture.
>
> So I agree with you it should better be fixed in the hvc framework,
> solve the issue in the first place.

Ok, sounds good to me, no need to check more backends then.
I see the hvc-console driver is listed as 'Odd Fixes' in the maintainer
list, with nobody assigned other than the ppc kernel list (added to Cc).

Once you come up with a fix in hvc_console.c, please send that to the
tty maintainers, the ppc list and me, and I'll review it.

        Arnd