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Re: [PATCH v2 3/4] seccomp: Create an action to log before allowing

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On Fri, Feb 10, 2017 at 4:01 PM, Tyler Hicks <tyhicks@canonical.com> wrote:
> On 02/07/2017 06:33 PM, Kees Cook wrote:
>> This adds to UAPI, so it'd be good to think for a moment about how
>> this would work on older kernels: right now, if someone tried to use
>> this RET_LOG on an old kernel, it'll get treated like RET_KILL. Is
>> this sane?
>
> It is not sane for userspace code to blindly attempt to use a new
> feature on an old kernel. One of the main motivations of the
> actions_avail sysctl is to allow userspace to be smart about what the
> current kernel supports.

Yeah, agreed. I mean, userspace could also build a little test
program, toss in RET_LOG, run it and see if it get SIGSYS. But that's
so much more pain that checking in /proc.

> I'll be adding logic (requested by Paul) to libseccomp that checks this
> sysctl when SECOMP_RET_LOG is attempted to be used. Programs that don't
> use libseccomp will have to do something similar.

Excellent, I had been meaning to ask if you'd chatted with Paul at
all, since this is an API addition for libseccomp. Speaking of which,
can you CC linux-api@ on the next version too?

-Kees

-- 
Kees Cook
Pixel Security

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Thread

[PATCH v2 0/4] Improved seccomp logging Tyler Hicks <tyhicks@canonical.com> - 2017-02-03 06:40 +0100
  [PATCH v2 3/4] seccomp: Create an action to log before allowing Tyler Hicks <tyhicks@canonical.com> - 2017-02-03 06:40 +0100
    Re: [PATCH v2 3/4] seccomp: Create an action to log before allowing Kees Cook <keescook@chromium.org> - 2017-02-08 01:40 +0100
      Re: [PATCH v2 3/4] seccomp: Create an action to log before allowing Kees Cook <keescook@chromium.org> - 2017-02-09 23:00 +0100
      Re: [PATCH v2 3/4] seccomp: Create an action to log before allowing Kees Cook <keescook@chromium.org> - 2017-02-11 01:20 +0100
        Re: [PATCH v2 3/4] seccomp: Create an action to log before allowing Tyler Hicks <tyhicks@canonical.com> - 2017-02-11 01:20 +0100
      Re: [PATCH v2 3/4] seccomp: Create an action to log before allowing Tyler Hicks <tyhicks@canonical.com> - 2017-02-11 01:20 +0100
  [PATCH v2 2/4] seccomp: Add sysctl to configure actions that should be logged Tyler Hicks <tyhicks@canonical.com> - 2017-02-03 06:40 +0100
    Re: [PATCH v2 2/4] seccomp: Add sysctl to configure actions that  should be logged Kees Cook <keescook@chromium.org> - 2017-02-08 01:40 +0100
      Re: [PATCH v2 2/4] seccomp: Add sysctl to configure actions that  should be logged Tyler Hicks <tyhicks@canonical.com> - 2017-02-11 01:00 +0100
        Re: [PATCH v2 2/4] seccomp: Add sysctl to configure actions that  should be logged Kees Cook <keescook@chromium.org> - 2017-02-11 01:10 +0100
  [PATCH v2 1/4] seccomp: Add sysctl to display available actions Tyler Hicks <tyhicks@canonical.com> - 2017-02-03 06:40 +0100
    Re: [PATCH v2 1/4] seccomp: Add sysctl to display available actions Kees Cook <keescook@chromium.org> - 2017-02-08 01:10 +0100
      Re: [PATCH v2 1/4] seccomp: Add sysctl to display available actions Tyler Hicks <tyhicks@canonical.com> - 2017-02-08 01:50 +0100
        Re: [PATCH v2 1/4] seccomp: Add sysctl to display available actions Kees Cook <keescook@chromium.org> - 2017-02-08 01:50 +0100
  [PATCH v2 4/4] seccomp: Add tests for SECCOMP_RET_LOG Tyler Hicks <tyhicks@canonical.com> - 2017-02-03 06:40 +0100
    Re: [PATCH v2 4/4] seccomp: Add tests for SECCOMP_RET_LOG Kees Cook <keescook@chromium.org> - 2017-02-08 01:50 +0100
  Re: [PATCH v2 0/4] Improved seccomp logging Kees Cook <keescook@chromium.org> - 2017-02-08 01:00 +0100

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