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Message-ID: <20180317170438.GA3351@light.dominikbrodowski.net>
Date: Sat, 17 Mar 2018 18:04:38 +0100
From: Dominik Brodowski <linux@...inikbrodowski.net>
To: Arnd Bergmann <arnd@...db.de>,
Christoph Hellwig <hch@...radead.org>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Al Viro <viro@...iv.linux.org.uk>,
Andy Lutomirski <luto@...nel.org>,
Ingo Molnar <mingo@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2 17/36] fs: add ksys_chroot() helper; remove-in kernel
calls to sys_chroot()
Arnd, Christoph,
On Thu, Mar 15, 2018 at 09:44:24PM +0100, Arnd Bergmann wrote:
> > diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
> > index 4afb04686c8e..5743f04014ca 100644
> > --- a/drivers/base/devtmpfs.c
> > +++ b/drivers/base/devtmpfs.c
> > @@ -387,7 +387,7 @@ static int devtmpfsd(void *p)
> > if (*err)
> > goto out;
> > sys_chdir("/.."); /* will traverse into overmounted root */
> > - sys_chroot(".");
> > + ksys_chroot(".");
> > complete(&setup_done);
> > while (1) {
> > spin_lock(&req_lock);
>
> Could this be done using kern_path()/set_fs_root() instead so we
> avoid the __user pointer?
>
> Arnd
On Fri, Mar 16, 2018 at 01:49:41AM -0700, Christoph Hellwig wrote:
> Agreed. Especially as we don't need any of the permission checks here.
Thanks for your input. As re-working this code to use the vfs-internal
helpers would probably mean that the syscall-cleanup code has to wait
for another release cycle, I propose to address this issue with the
following paragraph in the commit message:
In the near future, the fs-external callers of ksys_chroot() should be
converted to use kern_path()/set_fs_root() directly. Then ksys_chroot()
can be moved within sys_chroot() again.
Thanks,
Dominik
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