linux-kernel - Re: [RFC PATCH for 4.18 1/2] rseq: validate rseq_cs fields are < TASK

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Date:   Mon, 2 Jul 2018 12:04:20 -0400 (EDT)
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-api <linux-api@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Dave Watson <davejwatson@...com>, Paul Turner <pjt@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Russell King <linux@....linux.org.uk>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Andi Kleen <andi@...stfloor.org>,
        Chris Lameter <cl@...ux.com>, Ben Maurer <bmaurer@...com>,
        rostedt <rostedt@...dmis.org>,
        Josh Triplett <josh@...htriplett.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Joel Fernandes <joelaf@...gle.com>
Subject: Re: [RFC PATCH for 4.18 1/2] rseq: validate rseq_cs fields are <
 TASK_SIZE

----- On Jul 2, 2018, at 10:32 AM, Mathieu Desnoyers mathieu.desnoyers@...icios.com wrote:
[...]
> 
> But rather than trying to play games with input validation, I would
> favor an approach that would allow rseq to validate all its inputs
> straightforwardly. Introducing user_64bit_mode(struct pt_regs *)
> across all architectures would allow doing just that. rseq signal
> delivery and return to usermode code could then ensure that high bits are
> cleared by 32-bit tasks for all fields and thus provide a consistent
> behavior for 32-bit tasks running on 32-bit and 64-bit kernels.

AFAIU this could be achieved by re-introducing is_compat_task() on x86 as:

#ifdef CONFIG_COMPAT
static bool is_compat_task(void)
{
        return user_64bit_mode(current_pt_regs()));
}
#else
static bool is_compat_task(void) { return false; };
#endif

Or am I missing something ?

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com