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Message-ID: <CALCETrXd9MgAk2p72UMbOOoL2W1fP0UT_pc2bfG8r0t=qJotwg@mail.gmail.com>
Date: Fri, 7 Apr 2017 21:58:46 -0700
From: Andy Lutomirski <luto@...nel.org>
To: PaX Team <pageexec@...email.hu>
Cc: Mathias Krause <minipli@...glemail.com>, Andy Lutomirski <luto@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>, Kees Cook <keescook@...omium.org>,
"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>, Mark Rutland <mark.rutland@....com>,
Hoeun Ryu <hoeun.ryu@...il.com>, Emese Revfy <re.emese@...il.com>,
Russell King <linux@...linux.org.uk>, X86 ML <x86@...nel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
Peter Zijlstra <peterz@...radead.org>
Subject: Re: Re: [RFC v2][PATCH 04/11] x86: Implement __arch_rare_write_begin/unmap()
On Fri, Apr 7, 2017 at 12:58 PM, PaX Team <pageexec@...email.hu> wrote:
> On 7 Apr 2017 at 9:14, Andy Lutomirski wrote:
>
>> On Fri, Apr 7, 2017 at 6:30 AM, Mathias Krause <minipli@...glemail.com> wrote:
>> > On 7 April 2017 at 15:14, Thomas Gleixner <tglx@...utronix.de> wrote:
>> >> On Fri, 7 Apr 2017, Mathias Krause wrote:
>> > Fair enough. However, placing a BUG_ON(!(read_cr0() & X86_CR0_WP))
>> > somewhere sensible should make those "leaks" visible fast -- and their
>> > exploitation impossible, i.e. fail hard.
>>
>> The leaks surely exist and now we'll just add an exploitable BUG.
>
> can you please share those leaks that 'surely exist' and CC oss-security
> while at it?
I meant in the patchset here, not in grsecurity. grsecurity (on very,
very brief inspection) seems to read cr0 and fix it up in
pax_enter_kernel.
>>
>> Then someone who cares about performance can benchmark the CR0.WP
>> approach against it and try to argue that it's a good idea. This
>> benchmark should wait until I'm done with my PCID work, because PCID
>> is going to make use_mm() a whole heck of a lot faster.
>
> in my measurements switching PCID is hovers around 230 cycles for snb-ivb
> and 200-220 for hsw-skl whereas cr0 writes are around 230-240 cycles. there's
> of course a whole lot more impact for switching address spaces so it'll never
> be fast enough to beat cr0.wp.
>
If I'm reading this right, you're saying that a non-flushing CR3 write
is about the same cost as a CR0.WP write. If so, then why should CR0
be preferred over the (arch-neutral) CR3 approach? And why would
switching address spaces obviously be much slower? There'll be a very
small number of TLB fills needed for the actual protected access.
--Andy
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