netdev - [REGRESSION] mm: process_vm_readv testcase no longer works after compat_prcoess_vm

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Message-ID: <CAP045Aqrsb=CXHDHx4nS-pgg+MUDj14r-kN8_Jcbn-NAUziVag@mail.gmail.com>
Date:   Mon, 26 Oct 2020 15:55:13 -0700
From:   Kyle Huey <me@...ehuey.com>
To:     open list <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@....de>
Cc:     "Robert O'Callahan" <robert@...llahan.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jens Axboe <axboe@...nel.dk>, Arnd Bergmann <arnd@...db.de>,
        David Howells <dhowells@...hat.com>,
        "moderated list:ARM PORT" <linux-arm-kernel@...ts.infradead.org>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        sparclinux@...r.kernel.org, linux-block@...r.kernel.org,
        linux-scsi@...r.kernel.org,
        "open list:FILESYSTEMS (VFS and infrastructure)" 
        <linux-fsdevel@...r.kernel.org>, linux-aio@...ck.org,
        io-uring@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-mm@...ck.org, netdev@...r.kernel.org,
        keyrings@...r.kernel.org, linux-security-module@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [REGRESSION] mm: process_vm_readv testcase no longer works after
 compat_prcoess_vm_readv removed

A test program from the rr[0] test suite, vm_readv_writev[1], no
longer works on 5.10-rc1 when compiled as a 32 bit binary and executed
on a 64 bit kernel. The first process_vm_readv call (on line 35) now
fails with EFAULT. I have bisected this to
c3973b401ef2b0b8005f8074a10e96e3ea093823.

It should be fairly straightforward to extract the test case from our
repository into a standalone program.

- Kyle

[0] https://rr-project.org/
[1] https://github.com/mozilla/rr/blob/master/src/test/vm_readv_writev.c