linux-hardening - Re: [PATCH] exit: Put an upper limit on how often we can oops

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20221107211440.GA4233@openwall.com>
Date:   Mon, 7 Nov 2022 22:14:40 +0100
From:   Solar Designer <solar@...nwall.com>
To:     Jann Horn <jannh@...gle.com>
Cc:     Kees Cook <keescook@...omium.org>, linux-hardening@...r.kernel.org,
        kernel-hardening@...ts.openwall.com,
        Greg KH <gregkh@...uxfoundation.org>,
        Linus Torvalds <torvalds@...uxfoundation.org>,
        Seth Jenkins <sethjenkins@...gle.com>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Andy Lutomirski <luto@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] exit: Put an upper limit on how often we can oops

On Mon, Nov 07, 2022 at 09:13:17PM +0100, Jann Horn wrote:
> +oops_limit
> +==========
> +
> +Number of kernel oopses after which the kernel should panic when
> +``panic_on_oops`` is not set.

Rather than introduce this separate oops_limit, how about making
panic_on_oops (and maybe all panic_on_*) take the limit value(s) instead
of being Boolean?  I think this would preserve the current behavior at
panic_on_oops = 0 and panic_on_oops = 1, but would introduce your
desired behavior at panic_on_oops = 10000.  We can make 10000 the new
default.  If a distro overrides panic_on_oops, it probably sets it to 1
like RHEL does.

Are there distros explicitly setting panic_on_oops to 0?  If so, that
could be a reason to introduce the separate oops_limit.

I'm not advocating one way or the other - I just felt this should be
explicitly mentioned and decided on.

Alexander