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List:       linux-rdma
Subject:    Re: [PATCH v15 17/17] selftests, arm64: add a selftest for passing tagged pointers to kernel
From:       Catalin Marinas <catalin.marinas () arm ! com>
Date:       2019-05-31 16:22:06
Message-ID: 20190531162206.GB3568 () arrakis ! emea ! arm ! com
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On Fri, May 31, 2019 at 04:21:48PM +0200, Andrey Konovalov wrote:
> On Wed, May 22, 2019 at 4:16 PM Catalin Marinas <catalin.marinas@arm.com> wrote:
> > On Mon, May 06, 2019 at 06:31:03PM +0200, Andrey Konovalov wrote:
> > > This patch is a part of a series that extends arm64 kernel ABI to allow to
> > > pass tagged user pointers (with the top byte set to something else other
> > > than 0x00) as syscall arguments.
> > >
> > > This patch adds a simple test, that calls the uname syscall with a
> > > tagged user pointer as an argument. Without the kernel accepting tagged
> > > user pointers the test fails with EFAULT.
> >
> > That's probably sufficient for a simple example. Something we could add
> > to Documentation maybe is a small library that can be LD_PRELOAD'ed so
> > that you can run a lot more tests like LTP.
> 
> Should I add this into this series, or should this go into Vincenzo's patchset?

If you can tweak the selftest Makefile to build a library and force it
with LD_PRELOAD, you can keep it with this patch. It would be easier to
extend to other syscall tests, signal handling etc.

-- 
Catalin
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