Re: Linux 5.0-rc2 seccomp_bpf user_notification_basic test hangs

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On 1/17/19 9:45 AM, Tycho Andersen wrote:
On Thu, Jan 17, 2019 at 08:41:59AM -0800, Kees Cook wrote:
On Thu, Jan 17, 2019 at 8:27 AM Tycho Andersen <tycho@xxxxxxxx> wrote:

On Thu, Jan 17, 2019 at 08:12:50AM -0800, Kees Cook wrote:
On Wed, Jan 16, 2019 at 5:26 PM shuah <shuah@xxxxxxxxxx> wrote:
I am running Linux 5.0-rc2 and not an older kernel.

Weird. I couldn't reproduce this on 5.0-rc2, but I did see it on a
kernel without seccomp user_notif. Does the patch I sent fix it for
you? (And if so, can you take it in your tree?)

I can reproduce it; you have to run it as non-root. I think your patch
is necessary to get it to at least fail. The question is: what should
we do about these tests that require real root? Skip them if we're not
real-root, I guess?

Hm, maybe use the XFAIL() bit of the harness?

Perhaps it's time to make it a root-only test and do internal
priv-dropping to test the nnp-requiring parts? I'll add it to the TODO
list...


Yup that is a good way to handle it. Please skip the test with ksft skip
code for non-root runs.

Ok, I'll try to send a couple of patches soon to fix some of this up.
But at least yours should should stop things from hanging for now.


I am going to take Kees's patch to prevent hangs right away.

thanks,
-- Shuah




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