linux-kernel - Re: [PATCH 4/5] kprobes: Do not expose probe addresses to non-CAP

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Message-ID: <202007051318.CA51091A@keescook>
Date:   Sun, 5 Jul 2020 13:19:27 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Dominik Czarnota <dominik.czarnota@...ilofbits.com>,
        stable <stable@...r.kernel.org>, Jessica Yu <jeyu@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        KP Singh <kpsingh@...omium.org>,
        "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Will Deacon <will@...nel.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Marc Zyngier <maz@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Matteo Croce <mcroce@...hat.com>,
        Edward Cree <ecree@...arflare.com>,
        Nicolas Dichtel <nicolas.dichtel@...nd.com>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Ingo Molnar <mingo@...nel.org>,
        Netdev <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/5] kprobes: Do not expose probe addresses to
 non-CAP_SYSLOG

On Sun, Jul 05, 2020 at 01:10:54PM -0700, Linus Torvalds wrote:
> On Fri, Jul 3, 2020 at 8:50 AM Kees Cook <keescook@...omium.org> wrote:
> >
> > With 67 kthreads on a booted system, this patch does not immediately
> > blow up...
> 
> Did you try making read/write inc/dec that thing too? Or does that
> just blow up with tons of warnings?

I hadn't gotten to that yet. I need to catch up on other stuff first,
and I thought I'd give people time to scream if they tested this
themselves. :)

-- 
Kees Cook