linux-hardening - Re: [REGRESSION] 5.16rc1: SA

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Message-ID: <CAP045Aq06LV_jbXVc85bYU62h5EoVQ=rD9pDn+nGaUJ+iWe62w@mail.gmail.com>
Date:   Fri, 19 Nov 2021 08:07:36 -0800
From:   Kyle Huey <me@...ehuey.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        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>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        linux-hardening@...r.kernel.org,
        "Robert O'Callahan" <rocallahan@...il.com>
Subject: Re: [REGRESSION] 5.16rc1: SA_IMMUTABLE breaks debuggers

On Thu, Nov 18, 2021 at 8:12 AM Eric W. Biederman <ebiederm@...ssion.com> wrote:
> Kyle thank you for your explanation of what breaks.  For future kernels
> I do need to do some work in this area and I will copy on the patches
> going forward.  In particular I strongly suspect that changing the
> sigaction and blocked state of the signal for these synchronous signals
> is the wrong thing to do, especially if the process is not killed.  I
> want to find another solution that does not break things but that also
> does not change the program state behind the programs back so things
> work differently under the debugger.

The heads up in the future is appreciated, thanks.

- Kyle