linux-kernel - Re: [PATCH 00/35] Shadow stacks for userspace

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Message-ID: <8f96c2a6-9c03-f97a-df52-73ffc1d87957@intel.com>
Date:   Mon, 7 Feb 2022 08:30:50 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Adrian Reber <adrian@...as.de>, Mike Rapoport <rppt@...nel.org>
Cc:     Rick Edgecombe <rick.p.edgecombe@...el.com>, x86@...nel.org,
        "H . Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-mm@...ck.org,
        linux-arch@...r.kernel.org, linux-api@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        Andy Lutomirski <luto@...nel.org>,
        Balbir Singh <bsingharora@...il.com>,
        Borislav Petkov <bp@...en8.de>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Eugene Syromiatnikov <esyr@...hat.com>,
        Florian Weimer <fweimer@...hat.com>,
        "H . J . Lu" <hjl.tools@...il.com>, Jann Horn <jannh@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Kees Cook <keescook@...omium.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Oleg Nesterov <oleg@...hat.com>, Pavel Machek <pavel@....cz>,
        Peter Zijlstra <peterz@...radead.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        "Ravi V . Shankar" <ravi.v.shankar@...el.com>,
        Dave Martin <Dave.Martin@....com>,
        Weijiang Yang <weijiang.yang@...el.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        joao.moreira@...el.com, John Allen <john.allen@....com>,
        kcc@...gle.com, eranian@...gle.com,
        Andrei Vagin <avagin@...il.com>,
        Dmitry Safonov <0x7f454c46@...il.com>
Subject: Re: [PATCH 00/35] Shadow stacks for userspace

On 2/6/22 23:20, Adrian Reber wrote:
>>> 	CRIU Support
>>> 	------------
>>> 	In the past there was some speculation on the mailing list about 
>>> 	whether CRIU would need to be taught about CET. It turns out, it does. 
>>> 	The first issue hit is that CRIU calls sigreturn directly from its 
>>> 	“parasite code” that it injects into the dumper process. This violates
>>> 	this shadow stack implementation’s protection that intends to prevent
>>> 	attackers from doing this.
...
>>>From the CRIU side I can say that I would definitely like to see this
> resolved. CRIU just went through a similar exercise with rseq() being
> enabled in glibc and CI broke all around for us and other projects
> relying on CRIU. Although rseq() was around for a long time we were not
> aware of it but luckily 5.13 introduced a way to handle it for CRIU with
> ptrace. An environment variable existed but did not really help when
> CRIU is called somewhere in the middle of the container software stack.
> 
>>>From my point of view a solution not involving an environment variable
> would definitely be preferred.

Have there been things like this for CRIU in the past?  Something where
CRIU needs control but that's also security-sensitive?

Any thoughts on how you would _like_ to see this resolved?