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] [day] [month] [year] [list]

Message-ID: <d3760b84-82b6-d8e1-0fed-dc494d226f3f@linux.alibaba.com>
Date:   Wed, 28 Jul 2021 17:10:35 +0800
From:   Xianting Tian <xianting.tian@...ux.alibaba.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     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


在 2021/7/28 下午5:01, Arnd Bergmann 写道:
> 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.
OK, thanks, I will submit the patch ASAP :)
>
>          Arnd