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From: ebiederm@xmission.com (Eric W. Biederman)
To: Kees Cook <keescook@chromium.org>
Cc: Andrea Righi <andrea.righi@canonical.com>,
	Shuah Khan <shuah@kernel.org>,
	Alexei Starovoitov <ast@kernel.org>,
	Andy Lutomirski <luto@amacapital.net>,
	Will Drewry <wad@chromium.org>,
	linux-kselftest@vger.kernel.org, bpf@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org
Subject: Re: selftests: seccomp_bpf failure on 5.15
Date: Tue, 02 Nov 2021 13:22:19 -0500	[thread overview]
Message-ID: <87y2665sf8.fsf@disp2133> (raw)
In-Reply-To: <202110290755.451B036CE9@keescook> (Kees Cook's message of "Fri, 29 Oct 2021 07:58:02 -0700")

Kees Cook <keescook@chromium.org> writes:

> On Thu, Oct 28, 2021 at 05:06:53PM -0500, Eric W. Biederman wrote:
>> Kees Cook <keescook@chromium.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

  parent reply	other threads:[~2021-11-02 18:22 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-28 16:21 selftests: seccomp_bpf failure on 5.15 Andrea Righi
2021-10-28 16:56 ` Kees Cook
2021-10-28 17:26   ` Eric W. Biederman
2021-10-28 18:47     ` Kees Cook
2021-10-28 22:06       ` Eric W. Biederman
2021-10-29 14:58         ` Kees Cook
2021-10-29 15:17           ` Eric W. Biederman
2021-11-02 18:22           ` Eric W. Biederman [this message]
2021-11-03 16:14             ` Kees Cook
2021-11-03 18:35               ` Eric W. Biederman
2021-10-29 15:09       ` [PATCH] signal: Add SA_IMMUTABLE to ensure forced siganls do not get changed Eric W. Biederman
2021-10-31 17:40         ` Andrea Righi
2021-11-01 22:28           ` Eric W. Biederman

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