linux-kernel - Re: [PATCH v3 1/1] nvmet-tcp: Don't kmap() pages which can't come from HIGHMEM

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: <YwVjpTW6vWvdVQTK@ZenIV>
Date:   Wed, 24 Aug 2022 00:32:53 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     "Fabio M. De Francesco" <fmdefrancesco@...il.com>
Cc:     Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
        Chaitanya Kulkarni <kch@...dia.com>,
        James Smart <james.smart@...adcom.com>,
        Ira Weiny <ira.weiny@...el.com>,
        "Venkataramanan, Anirudh" <anirudh.venkataramanan@...el.com>,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Chaitanya Kulkarni <chaitanyak@...dia.com>,
        Keith Busch <kbusch@...nel.org>
Subject: Re: [PATCH v3 1/1] nvmet-tcp: Don't kmap() pages which can't come
 from HIGHMEM

On Mon, Aug 22, 2022 at 04:24:38PM +0200, Fabio M. De Francesco wrote:

> Therefore, replace the kmap() of sg_page(sg) with a page_address() and
> delete the "nr_mapped" field from "nvmet_tcp_cmd" and instead pass a
> local variable to iov_iter_kvec() from the call site in
> nvmet_tcp_map_pdu_iovec().

I'd suggest looking into switching to ITER_BVEC...