[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <CAAeHK+wJbbCZd+-X=9oeJgsqQJiq8h+Aagz3SQMPaAzCD+pvFw@mail.gmail.com>
Date: Thu, 28 Jun 2018 21:30:16 +0200
From: Andrey Konovalov <andreyknvl@...gle.com>
To: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will.deacon@....com>,
Mark Rutland <mark.rutland@....com>,
Robin Murphy <robin.murphy@....com>,
Al Viro <viro@...iv.linux.org.uk>,
Kees Cook <keescook@...omium.org>,
Kate Stewart <kstewart@...uxfoundation.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Ingo Molnar <mingo@...nel.org>,
"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
Shuah Khan <shuah@...nel.org>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
linux-doc@...r.kernel.org,
Linux Memory Management List <linux-mm@...ck.org>,
linux-arch@...r.kernel.org, linux-kselftest@...r.kernel.org,
LKML <linux-kernel@...r.kernel.org>,
Chintan Pandya <cpandya@...eaurora.org>,
Jacob Bramley <Jacob.Bramley@....com>,
Ruben Ayrapetyan <Ruben.Ayrapetyan@....com>,
Lee Smith <Lee.Smith@....com>,
Kostya Serebryany <kcc@...gle.com>,
Dmitry Vyukov <dvyukov@...gle.com>,
Ramana Radhakrishnan <Ramana.Radhakrishnan@....com>,
Evgeniy Stepanov <eugenis@...gle.com>
Subject: Re: [PATCH v4 0/7] arm64: untag user pointers passed to the kernel
On Wed, Jun 27, 2018 at 5:05 PM, Andrey Konovalov <andreyknvl@...gle.com> wrote:
> On Tue, Jun 26, 2018 at 7:29 PM, Catalin Marinas
> <catalin.marinas@....com> wrote:
>> While I support this work, as a maintainer I'd like to understand
>> whether we'd be in a continuous chase of ABI breaks with every kernel
>> release or we have a better way to identify potential issues. Is there
>> any way to statically analyse conversions from __user ptr to long for
>> example? Or, could we get the compiler to do this for us?
>
>
> OK, got it, I'll try to figure out a way to find these conversions.
I've prototyped a checker on top of clang static analyzer (initially
looked at sparse, but couldn't find any documentation or examples).
The results are here [1], search for "warning: user pointer cast".
Sharing in case anybody wants to take a look, will look at them myself
tomorrow.
[1] https://gist.github.com/xairy/433edd5c86456a64026247cb2fef2115
Powered by blists - more mailing lists