linux-kernel - Re: [RFC PATCH 0/7] x86: introduce system calls addess space isolation

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Message-ID: <alpine.LRH.2.00.1904261006290.10464@gjva.wvxbf.pm>
Date:   Fri, 26 Apr 2019 10:07:50 +0200 (CEST)
From:   Jiri Kosina <jikos@...nel.org>
To:     Andy Lutomirski <luto@...nel.org>
cc:     Mike Rapoport <rppt@...ux.ibm.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        Jonathan Adams <jwadams@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Paul Turner <pjt@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linux-MM <linux-mm@...ck.org>,
        LSM List <linux-security-module@...r.kernel.org>,
        X86 ML <x86@...nel.org>
Subject: Re: [RFC PATCH 0/7] x86: introduce system calls addess space
 isolation

On Thu, 25 Apr 2019, Andy Lutomirski wrote:

> The benefit seems to come from making sure that the RET instruction 
> actually goes somewhere that's already been faulted in.

Which doesn't seem to be really compatible with things like retpolines or 
anyone using FTRACE_WITH_REGS to modify stored instruction pointer.

-- 
Jiri Kosina
SUSE Labs