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Re: BPF hash algo (Re: [kernel-hardening] Re: [PATCH v7 3/6] random: use SipHash in place of MD5)

From Hannes Frederic Sowa <hannes@stressinduktion.org>
Newsgroups linux.kernel
Subject Re: BPF hash algo (Re: [kernel-hardening] Re: [PATCH v7 3/6] random: use SipHash in place of MD5)
Date 2016-12-22 21:10 +0100
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References <sRe6l-3cC-13@gated-at.bofh.it> <sReSJ-3uM-5@gated-at.bofh.it> <sRflM-3Vq-35@gated-at.bofh.it> <sRhnz-592-1@gated-at.bofh.it> <sRhGW-5ft-23@gated-at.bofh.it>
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On 22.12.2016 20:56, Andy Lutomirski wrote:
> It's also not quite clear to me why userspace needs to be able to
> calculate the digest on its own.  A bpf(BPF_CALC_PROGRAM_DIGEST)
> command that takes a BPF program as input and hashes it would seem to
> serve the same purpose, and that would allow the kernel to key the
> digest and change the algorithm down the road without breaking things.

I think that people expect digests of BPF programs to be stable over
time and reboots.

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BPF hash algo (Re: [kernel-hardening] Re: [PATCH v7 3/6] random: use  SipHash in place of MD5) Andy Lutomirski <luto@amacapital.net> - 2016-12-22 17:10 +0100
  Re: BPF hash algo (Re: [kernel-hardening] Re: [PATCH v7 3/6] random:  use SipHash in place of MD5) "Jason A. Donenfeld" <Jason@zx2c4.com> - 2016-12-22 17:30 +0100
    Re: BPF hash algo (Re: [kernel-hardening] Re: [PATCH v7 3/6] random:  use SipHash in place of MD5) Andy Lutomirski <luto@amacapital.net> - 2016-12-22 18:00 +0100
  Re: BPF hash algo (Re: [kernel-hardening] Re: [PATCH v7 3/6]  random: use SipHash in place of MD5) Hannes Frederic Sowa <hannes@stressinduktion.org> - 2016-12-22 18:00 +0100
    Re: BPF hash algo (Re: [kernel-hardening] Re: [PATCH v7 3/6] random:  use SipHash in place of MD5) Andy Lutomirski <luto@amacapital.net> - 2016-12-22 18:30 +0100
      Re: BPF hash algo (Re: [kernel-hardening] Re: [PATCH v7 3/6]  random: use SipHash in place of MD5) Hannes Frederic Sowa <hannes@stressinduktion.org> - 2016-12-22 19:00 +0100
      Re: BPF hash algo (Re: [kernel-hardening] Re: [PATCH v7 3/6] random:  use SipHash in place of MD5) Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2016-12-22 20:40 +0100
        Re: BPF hash algo (Re: [kernel-hardening] Re: [PATCH v7 3/6] random:  use SipHash in place of MD5) Andy Lutomirski <luto@kernel.org> - 2016-12-22 21:00 +0100
          Re: BPF hash algo (Re: [kernel-hardening] Re: [PATCH v7 3/6] random:  use SipHash in place of MD5) Hannes Frederic Sowa <hannes@stressinduktion.org> - 2016-12-22 21:10 +0100
      Re: BPF hash algo (Re: [kernel-hardening] Re: [PATCH v7 3/6] random:  use SipHash in place of MD5) Daniel Borkmann <daniel@iogearbox.net> - 2016-12-23 11:30 +0100
    Re: BPF hash algo (Re: [kernel-hardening] Re: [PATCH v7 3/6] random:  use SipHash in place of MD5) "Jason A. Donenfeld" <Jason@zx2c4.com> - 2016-12-22 19:20 +0100
    Re: BPF hash algo (Re: [kernel-hardening] Re: [PATCH v7 3/6] random:  use SipHash in place of MD5) Daniel Borkmann <daniel@iogearbox.net> - 2016-12-23 11:10 +0100
      Re: BPF hash algo (Re: [kernel-hardening] Re: [PATCH v7 3/6]  random: use SipHash in place of MD5) Hannes Frederic Sowa <hannes@stressinduktion.org> - 2016-12-23 12:00 +0100
        Re: BPF hash algo (Re: [kernel-hardening] Re: [PATCH v7 3/6] random:  use SipHash in place of MD5) Daniel Borkmann <daniel@iogearbox.net> - 2016-12-23 13:10 +0100
          Re: BPF hash algo (Re: [kernel-hardening] Re: [PATCH v7 3/6] random:  use SipHash in place of MD5) Andy Lutomirski <luto@amacapital.net> - 2016-12-23 17:30 +0100
            Re: BPF hash algo (Re: [kernel-hardening] Re: [PATCH v7 3/6] random:  use SipHash in place of MD5) Andy Lutomirski <luto@amacapital.net> - 2016-12-23 17:50 +0100
              Re: BPF hash algo (Re: [kernel-hardening] Re: [PATCH v7 3/6] random:  use SipHash in place of MD5) Hannes Frederic Sowa <hannes@stressinduktion.org> - 2016-12-23 19:20 +0100
                Re: BPF hash algo (Re: [kernel-hardening] Re: [PATCH v7 3/6] random:  use SipHash in place of MD5) "Jason A. Donenfeld" <Jason@zx2c4.com> - 2016-12-23 22:20 +0100

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