linux-hardening - Re: [PATCH 1/2] signal: Don't always set SA

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Message-ID: <87r1bcp4pv.fsf@email.froward.int.ebiederm.org>
Date:   Fri, 19 Nov 2021 09:03:56 -0600
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Kyle Huey <me@...ehuey.com>
Cc:     open list <linux-kernel@...r.kernel.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>,
        linux-hardening@...r.kernel.org,
        "Robert O'Callahan" <rocallahan@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Oliver Sang <oliver.sang@...el.com>, lkp@...ts.01.org,
        kbuild test robot <lkp@...el.com>
Subject: Re: [PATCH 1/2] signal: Don't always set SA_IMMUTABLE for forced signals

Kyle Huey <me@...ehuey.com> writes:

> On Thu, Nov 18, 2021 at 2:05 PM Eric W. Biederman <ebiederm@...ssion.com> wrote:
>>
>>
>> Recently to prevent issues with SECCOMP_RET_KILL and similar signals
>> being changed before they are delivered SA_IMMUTABLE was added.
>>
>> Unfortunately this broke debuggers[1][2] which reasonably expect to be
>> able to trap synchronous SIGTRAP and SIGSEGV even when the target
>> process is not configured to handle those signals.
>>
>> Update force_sig_to_task to support both the case when we can
>> allow the debugger to intercept and possibly ignore the
>> signal and the case when it is not safe to let userspace
>> known about the signal until the process has exited.
>
> s/known/know/

Fixed.


>> Reported-by: Kyle Huey <me@...ehuey.com>
>> Reported-by: kernel test robot <oliver.sang@...el.com>
>> Cc: stable@...r.kernel.org
>> [1] https://lkml.kernel.org/r/CAP045AoMY4xf8aC_4QU_-j7obuEPYgTcnQQP3Yxk=2X90jtpjw@mail.gmail.com
>> [2] https://lkml.kernel.org/r/20211117150258.GB5403@xsang-OptiPlex-902
>
> This link doesn't work.

Shame.  I missed a trailing 0, but unfortunately that request did not go
to list that is archived on lore.  I will keep the link on the chance
the message winds up in a lore archive in the future.

Eric