linux-kernel - Re: [PATCH 6/6] exec: use force_uaccess

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Date:   Wed, 15 Jul 2020 08:06:20 +0200
From:   Christoph Hellwig <hch@....de>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Christoph Hellwig <hch@....de>, Nick Hu <nickhu@...estech.com>,
        Greentime Hu <green.hu@...il.com>,
        Vincent Chen <deanbo422@...il.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-riscv@...ts.infradead.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/6] exec: use force_uaccess_begin during exec and exit

On Tue, Jul 14, 2020 at 10:33:05PM -0500, Eric W. Biederman wrote:
> Christoph Hellwig <hch@....de> writes:
> 
> > Both exec and exit want to ensure that the uaccess routines actually do
> > access user pointers.  Use the newly added force_uaccess_begin helper
> > instead of an open coded set_fs for that to prepare for kernel builds
> > where set_fs() does not exist.
> 
> Acked-by: "Eric W. Biederman" <ebiederm@...ssion.com>
> 
> Have you played with a tree with all of your patches
> and placing force_uaccess_begin in init/main.c:start_kernel?

No, I have converted the early boot code to not require KERNEL_DS
and except for a pending network item remove set_fs entirely.  Older
series here, will need some rework:

http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/set_fs-removal