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Tue, 16 Nov 2021 19:00:36 +0000 Received: by kubenode523.mail-prod1.omega.bf1.yahoo.com (VZM Hermes SMTP Server) with ESMTPA ID 16992bd20597bf90782469ca1b8ad7d7; Tue, 16 Nov 2021 19:00:31 +0000 (UTC) Message-ID: Date: Tue, 16 Nov 2021 11:00:23 -0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.3.0 Subject: Re: [PATCH v2 0/2] Introduce the pkill_on_warn parameter Content-Language: en-US To: Kees Cook , Alexander Popov Cc: Steven Rostedt , Linus Torvalds , Lukas Bulwahn , Jonathan Corbet , Paul McKenney , Andrew Morton , Thomas Gleixner , Peter Zijlstra , Joerg Roedel , Maciej Rozycki , Muchun Song , Viresh Kumar , Robin Murphy , Randy Dunlap , Lu Baolu , Petr Mladek , Luis Chamberlain , Wei Liu , John Ogness , Andy Shevchenko , Alexey Kardashevskiy , Christophe Leroy , Jann Horn , Greg Kroah-Hartman , Mark Rutland , Andy Lutomirski , Dave Hansen , Will Deacon , Ard Biesheuvel , Laura Abbott , David S Miller , Borislav Petkov , Arnd Bergmann , Andrew Scull , Marc Zyngier , Jessica Yu , Iurii Zaikin , Rasmus Villemoes , Wang Qing , Mel Gorman , Mauro Carvalho Chehab , Andrew Klychkov , Mathieu Chouquet-Stringer , Daniel Borkmann , Stephen Kitt , Stephen Boyd , Thomas Bogendoerfer , Mike Rapoport , Bjorn Andersson , Kernel Hardening , linux-hardening@vger.kernel.org, "open list:DOCUMENTATION" , linux-arch , Linux Kernel Mailing List , linux-fsdevel , notify@kernel.org, main@lists.elisa.tech, safety-architecture@lists.elisa.tech, devel@lists.elisa.tech, Shuah Khan , Casey Schaufler References: <20211027233215.306111-1-alex.popov@linux.com> <77b79f0c-48f2-16dd-1d00-22f3a1b1f5a6@linux.com> <20211115110649.4f9cb390@gandalf.local.home> <202111151116.933184F716@keescook> <59534db5-b251-c0c8-791f-58aca5c00a2b@linux.com> <202111161037.7456C981@keescook> From: Casey Schaufler In-Reply-To: <202111161037.7456C981@keescook> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Mailer: WebService/1.1.19306 mail.backend.jedi.jws.acl:role.jedi.acl.token.atz.jws.hermes.yahoo Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/16/2021 10:41 AM, Kees Cook wrote: > On Tue, Nov 16, 2021 at 12:12:16PM +0300, Alexander Popov wrote: >> What if the Linux kernel had a LSM module responsible for error handling policy? >> That would require adding LSM hooks to BUG*(), WARN*(), KERN_EMERG, etc. >> In such LSM policy we can decide immediately how to react on the kernel error. >> We can even decide depending on the subsystem and things like that. > That would solve the "atomicity" issue the WARN tracepoint solution has, > and it would allow for very flexible userspace policy. > > I actually wonder if the existing panic_on_* sites should serve as a > guide for where to put the hooks. The current sysctls could be replaced > by the hooks and a simple LSM. Do you really want to make error handling a "security" issue? If you add security_bug(), security_warn_on() and the like you're begging that they be included in SELinux (AppArmor) policy. BPF, too, come to think of it. Is that what you want?