linux-hardening - Re: selftests: seccomp

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Date:   Tue, 02 Nov 2021 13:22:19 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Kees Cook <keescook@...omium.org>
Cc:     Andrea Righi <andrea.righi@...onical.com>,
        Shuah Khan <shuah@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Andy Lutomirski <luto@...capital.net>,
        Will Drewry <wad@...omium.org>,
        linux-kselftest@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: selftests: seccomp_bpf failure on 5.15

Kees Cook <keescook@...omium.org> writes:

> On Thu, Oct 28, 2021 at 05:06:53PM -0500, Eric W. Biederman wrote:
>> Kees Cook <keescook@...omium.org> writes:
>> 
>> > On Thu, Oct 28, 2021 at 12:26:26PM -0500, Eric W. Biederman wrote:
>> 
>> Is it a problem that the debugger can see the signal if the process does
>> not?
>
> Right, I'm trying to understand that too. However, my neighbor just lost
> power. :|
>
> What I was in the middle of checking was what ptrace "sees" going
> through a fatal SIGSYS; my initial debugging attempts were weird.

Kees have you regained power and had a chance to see my SA_IMMUTABLE
patch?

Does what I implemented seem like it will work for you?

I think it is a solid and simple solution to a pair of problems with my
change to use the ordinary coredump path for seccomp.  But I would very
much love to hear it seems reasonable to you, as you were looking at the
problem as well.

Eric