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Message-ID: <20200406171058.GA5352@infradead.org>
Date: Mon, 6 Apr 2020 10:10:58 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Christoph Hellwig <hch@...radead.org>,
Sean Christopherson <sean.j.christopherson@...el.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
linux-kernel@...r.kernel.org,
"Kenneth R. Crudup" <kenny@...ix.com>,
Jessica Yu <jeyu@...nel.org>,
Rasmus Villemoes <rasmus.villemoes@...vas.dk>,
Paolo Bonzini <pbonzini@...hat.com>,
Fenghua Yu <fenghua.yu@...el.com>,
Xiaoyao Li <xiaoyao.li@...el.com>,
Nadav Amit <nadav.amit@...il.com>,
Thomas Hellstrom <thellstrom@...are.com>,
Tony Luck <tony.luck@...el.com>,
Steven Rostedt <rostedt@...dmis.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jann Horn <jannh@...gle.com>,
Kees Cook <keescook@...omium.org>,
David Laight <David.Laight@...lab.com>,
Doug Covelli <dcovelli@...are.com>
Subject: Re: [RFC PATCH] x86/split_lock: Disable SLD if an unaware
(out-of-tree) module enables VMX
On Mon, Apr 06, 2020 at 06:01:57PM +0200, Peter Zijlstra wrote:
> Please feel free to use my pgprot_nx() and apply liberally on any
> exported function.
>
> But crucially, I don't think any of the still exported functions allows
> getting memory in the text range, and if you want to run code outside of
> the text range, things become _much_ harder. That said, modules
> shouldn't be able to create executable code, full-stop (IMO).
This is what i've got for now:
http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/sanitize-vmalloc-api
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