linux-kernel - RE: [PATCH v2] MIPS: Add nonxstack=on|off kernel parameter

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Message-ID: <alpine.DEB.2.00.1801021830110.31257@tp.orcam.me.uk>
Date:   Tue, 2 Jan 2018 18:35:08 +0000
From:   "Maciej W. Rozycki" <macro@...s.com>
To:     Miodrag Dinic <Miodrag.Dinic@...s.com>
CC:     Paul Burton <Paul.Burton@...s.com>,
        Aleksandar Markovic <aleksandar.markovic@...rk.com>,
        Aleksandar Markovic <Aleksandar.Markovic@...s.com>,
        James Hogan <James.Hogan@...s.com>,
        "David Daney" <ddaney@...iumnetworks.com>,
        "linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        DengCheng Zhu <DengCheng.Zhu@...s.com>,
        Ding Tianhong <dingtianhong@...wei.com>,
        Douglas Leung <Douglas.Leung@...s.com>,
        "Frederic Weisbecker" <frederic@...nel.org>,
        Goran Ferenc <Goran.Ferenc@...s.com>,
        "Ingo Molnar" <mingo@...nel.org>,
        James Cowgill <James.Cowgill@...tec.com>,
        "Jonathan Corbet" <corbet@....net>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Marc Zyngier <marc.zyngier@....com>,
        "Matt Redfearn" <Matt.Redfearn@...s.com>,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Petar Jovanovic <Petar.Jovanovic@...s.com>,
        Raghu Gandham <Raghu.Gandham@...s.com>,
        "Ralf Baechle" <ralf@...ux-mips.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Tom Saeger" <tom.saeger@...cle.com>
Subject: RE: [PATCH v2] MIPS: Add nonxstack=on|off kernel parameter

Hi Miodrag,

> > I presume what you
> > actually want here is for the kernel to lie & indicate to whatever part
> > of Android that performs this check that the stack is non-executable
> > even when it is really executable?
> 
> Basically yes, because we do not have other options at this point.

 Please make the purpose of this option unambiguous in documentation then, 
along with suitable precautionary notes about any adverse consequences of 
its use.

  Maciej