linux-kernel - Re: [PATCH v3 0/3] Rust scatterlist abstractions

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: <37513fcd-b371-cc2f-b7f9-e94b045d8c5c@antgroup.com>
Date:   Mon, 12 Jun 2023 11:49:51 +0800
From:   "Qingsong Chen" <changxian.cqs@...group.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     <linux-kernel@...r.kernel.org>,
        "田洪亮" <tate.thl@...group.com>,
        "Miguel Ojeda" <ojeda@...nel.org>,
        "Alex Gaynor" <alex.gaynor@...il.com>,
        "Wedson Almeida Filho" <wedsonaf@...il.com>,
        "Boqun Feng" <boqun.feng@...il.com>, "Gary Guo" <gary@...yguo.net>,
        "Björn Roy Baron" <bjorn3_gh@...tonmail.com>,
        "Benno Lossin" <benno.lossin@...ton.me>,
        <rust-for-linux@...r.kernel.org>
Subject: Re: [PATCH v3 0/3] Rust scatterlist abstractions

On 6/10/23 11:35 PM, Greg KH wrote:
> On Sat, Jun 10, 2023 at 05:33:47PM +0200, Greg KH wrote:
>> On Sat, Jun 10, 2023 at 06:49:06PM +0800, Qingsong Chen wrote:
>>> Hi All!
>>>
>>> This is a version of scatterlist abstractions for Rust drivers.
>>>
>>> Scatterlist is used for efficient management of memory buffers, which is
>>> essential for many kernel-level operations such as Direct Memory Access
>>> (DMA) transfers and crypto APIs.
>>>
>>> This patch should be a good start to introduce the crypto APIs for Rust
>>> drivers and to develop cipher algorithms in Rust later.
>>
>> I thought we were getting rid of the scatter list api for the crypto
>> drivers, so this shouldn't be needed going forward, right?  Why not just
>> use the direct apis instead?
> 
> See https://lore.kernel.org/r/ZH2hgrV6po9dkxi+@gondor.apana.org.au for
> the details of that (sorry I forgot the link first time...)

Thanks for the information. I agree that turning simple buffers into
sg-bufs is not a good idea. If I were implementing a new cipher
algorithm, I would definitely follow the `struct cipher_alg`, which
takes simple `u8 *` pointer as parameter. However, if we'd like to
utilize some existing ciphers, such as aead, we still need scatterlists
to construct an `aead_request` for further operations, util changes are
made to the underlying interface.

Qingsong Chen