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  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]
Date:   Thu, 13 Aug 2020 14:50:22 +0200
From:   Willem de Bruijn <>
To:     Miaohe Lin <>
Cc:     David Miller <>,
        Jakub Kicinski <>,
        Florian Westphal <>,,,,
        Eric Dumazet <>,
        Steffen Klassert <>,
        Paolo Abeni <>,
        Shmulik Ladkani <>,
        Yadu Kishore <>,,
        Network Development <>,
        linux-kernel <>
Subject: Re: [PATCH] net: add missing skb_uarg refcount increment in pskb_carve_inside_header()

On Thu, Aug 13, 2020 at 2:16 PM Miaohe Lin <> wrote:
> If the skb is zcopied, we should increase the skb_uarg refcount before we
> involve skb_release_data(). See pskb_expand_head() as a reference.

Did you manage to observe a bug through this datapath in practice?

pskb_carve_inside_header is called
  from pskb_carve
    from pskb_extract
      from rds_tcp_data_recv

That receive path should not see any packets with zerocopy state associated.

> Fixes: 6fa01ccd8830 ("skbuff: Add pskb_extract() helper function")
> Signed-off-by: Miaohe Lin <>

Powered by blists - more mailing lists