[PATCH] Add 10-yama-ptrace.conf (rhbz 1209492)

[Josh Boyer]

On Mon, Aug 3, 2015 at 5:49 PM, Paul Moore <pmoore at redhat.com> wrote:
> On Saturday, August 01, 2015 10:08:14 PM Mark Wielaard wrote:
>> On Mon, Jul 06, 2015 at 03:49:18PM +0200, Mark Wielaard wrote:
>> > On Mon, 2015-07-06 at 09:39 -0400, Josh Boyer wrote:
>> > > On Mon, Jul 6, 2015 at 9:10 AM, Mark Wielaard <mjw at redhat.com> wrote:
>> > > > https://bugzilla.redhat.com/show_bug.cgi?id=1209492 (an to this email)
>> > > > to revert the yama config setting to the upstream default. This fixes
>> > >
>> > > That would make the sysctl file systemd just added on your request
>> > > completely pointless and actually incorrect because changing the value
>> > > wouldn't work at all.
>> >
>> > Yes, that is a downside of the patch. You won't be able to switch the
>> > default value anymore. But if we cannot do that by installing the sysctl
>> > file in either the kernel or systemd the alternative would be to hunt
>> > down and fix all individually packages that rely on ptrace working
>> > normally. Which seems unattractive to me if the fix in the kernel is so
>> > simple.
>>
>> It took some time but we eventually came up with a solution.  Stephen
>> Smalley who added the support for yama originally to the fedora kernel
>> agrees with the approach. And Paul Moore is making sure this gets merged
>> upstream. Attached are commits for f22, f23 and master. Please let me know
>> if you need anything else to get these applied.
>
> For the record, I don't really consider this a long term solution as the risks
> associated with ptrace() still exist.  While Mark and a few others on the BZ
> are happy to discount the risk, I am not.  However, my current workload
> doesn't allow me to keep arguing with Mark so I'm looking into ways to leave
> Yama in the kernel, but disabled by default.  If someone else is able to
> continue fighting for ptrace restrictions at this point in time, I would
> suggest adding yourself to the BZ.
>
> Also, it appears that the patch I posted last week isn't really viable
> upstream due to a general distaste of setting sysctl defaults with CONFIG
> settings.  I have another thought, but I think that discussion is better had
> on the BZ than on this list.

Right.  This is what I meant by "carrying a patch forever" in the bug.
And because of that, I'm probably not going to apply this to Fedora.

If you have a link to the upstream conversation I would appreciate it.

josh