linux-kernel - RE: let import_iovec deal with compat

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Message-ID: <2c7bf42ee4314484ae0177280cd8f5f3@AcuMS.aculab.com>
Date:   Sat, 19 Sep 2020 14:24:10 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Christoph Hellwig' <hch@....de>,
        Alexander Viro <viro@...iv.linux.org.uk>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        Jens Axboe <axboe@...nel.dk>, Arnd Bergmann <arnd@...db.de>,
        David Howells <dhowells@...hat.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        "linux-parisc@...r.kernel.org" <linux-parisc@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-aio@...ck.org" <linux-aio@...ck.org>,
        "io-uring@...r.kernel.org" <io-uring@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "keyrings@...r.kernel.org" <keyrings@...r.kernel.org>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>
Subject: RE: let import_iovec deal with compat_iovecs as well

From: Christoph Hellwig
> Sent: 18 September 2020 13:45
> 
> this series changes import_iovec to transparently deal with comat iovec
> structures, and then cleanups up a lot of code dupliation.  But to get
> there it first has to fix the pre-existing bug that io_uring compat
> contexts don't trigger the in_compat_syscall() check.  This has so far
> been relatively harmless as very little code callable from io_uring used
> the check, and even that code that could be called usually wasn't.

I thought about that change while writing my import_iovec() => iovec_import()
patch - and thought that the io_uring code would (as usual) cause grief.

Christoph - did you see those patches?
	David

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