linux-kernel - Re: [PATCH v4] tun: avoid high-order page allocation for packet header

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: <CANn89iKvh=da2uRkGn5dTX5Yxvz-uZdSJoKf0+pPU16XVDt=fg@mail.gmail.com>
Date:   Thu, 10 Aug 2023 08:53:23 +0200
From:   Eric Dumazet <edumazet@...gle.com>
To:     Tahsin Erdogan <trdgn@...zon.com>
Cc:     Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] tun: avoid high-order page allocation for packet header

On Wed, Aug 9, 2023 at 6:48 PM Tahsin Erdogan <trdgn@...zon.com> wrote:
>
> When gso.hdr_len is zero and a packet is transmitted via write() or
> writev(), all payload is treated as header which requires a contiguous
> memory allocation. This allocation request is harder to satisfy, and may
> even fail if there is enough fragmentation.
>
> Note that sendmsg() code path limits the linear copy length, so this change
> makes write()/writev() and sendmsg() paths more consistent.
>
> Signed-off-by: Tahsin Erdogan <trdgn@...zon.com>

Reviewed-by: Eric Dumazet <edumazet@...gle.com>

Thanks.