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Groups > linux.kernel > #1222193

Re: RFC: fsyscall

From "Serge E. Hallyn" <serge@hallyn.com>
Newsgroups linux.kernel
Subject Re: RFC: fsyscall
Date 2015-09-10 15:30 +0200
Message-ID <q7a5k-2Ey-25@gated-at.bofh.it> (permalink)
References (1 earlier) <q6A1P-1mX-1@gated-at.bofh.it> <q6Alb-1Zd-1@gated-at.bofh.it> <q6Alb-1Zd-15@gated-at.bofh.it> <q6BAB-3Go-5@gated-at.bofh.it> <q6Rm2-1gb-9@gated-at.bofh.it>
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On Wed, Sep 09, 2015 at 06:27:06PM +0100, David Drysdale wrote:
> On Wed, Sep 9, 2015 at 1:25 AM, Eric W. Biederman <ebiederm@xmission.com> wrote:
> > Andy Lutomirski <luto@amacapital.net> writes:
> > > On Tue, Sep 8, 2015 at 4:07 PM, Eric W. Biederman <ebiederm@xmission.com> wrote:
>
> (From this perspective, the limitation that seccomp-bpf programs only
> have access to syscall arguments by-value is actually a help -- the filter
> can't look into user memory, so can't be fooled by having memory
> contents changed underneath it.  Of course, if the eBPF stuff ever
> changes that we should watch out...)

Yup and I'm quite sure I've seen that raised as a reason to refuse
supporting exactly that.
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Thread

RFC: fsyscall ebiederm@xmission.com (Eric W. Biederman) - 2015-09-09 00:50 +0200
  Re: RFC: fsyscall Andy Lutomirski <luto@amacapital.net> - 2015-09-09 01:00 +0200
    Re: RFC: fsyscall ebiederm@xmission.com (Eric W. Biederman) - 2015-09-09 01:20 +0200
      Re: RFC: fsyscall Andy Lutomirski <luto@amacapital.net> - 2015-09-09 01:20 +0200
        Re: RFC: fsyscall ebiederm@xmission.com (Eric W. Biederman) - 2015-09-09 02:40 +0200
          Re: RFC: fsyscall David Drysdale <drysdale@google.com> - 2015-09-09 19:30 +0200
            Re: RFC: fsyscall ebiederm@xmission.com (Eric W. Biederman) - 2015-09-09 21:50 +0200
              Re: RFC: fsyscall "Serge E. Hallyn" <serge@hallyn.com> - 2015-09-10 15:40 +0200
            Re: RFC: fsyscall "Serge E. Hallyn" <serge@hallyn.com> - 2015-09-10 15:30 +0200
          Re: RFC: fsyscall "Serge E. Hallyn" <serge@hallyn.com> - 2015-09-10 15:50 +0200
            Re: RFC: fsyscall David Drysdale <drysdale@google.com> - 2015-09-10 16:00 +0200
              Re: RFC: fsyscall "Serge E. Hallyn" <serge@hallyn.com> - 2015-09-10 16:10 +0200
                Re: RFC: fsyscall "Serge E. Hallyn" <serge@hallyn.com> - 2015-09-10 16:10 +0200
                Re: RFC: fsyscall "Serge E. Hallyn" <serge@hallyn.com> - 2015-09-10 16:10 +0200

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