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

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Message-ID: <CAHk-=wgEkTsNRvEM9W_JiVN6t70SnPuP=-1=LyhLS_BJ25Q4sQ@mail.gmail.com>
Date:   Sun, 5 Jul 2020 13:10:54 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Kees Cook <keescook@...omium.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 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?

                 Linus