linux-kernel - Re: [PATCH v10 2/9] proc: allow to mount many instances of proc in one pid namespace

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Message-ID: <20200402163246.7kfzujkku65belrw@comp-core-i7-2640m-0182e6>
Date:   Thu, 2 Apr 2020 18:32:46 +0200
From:   Alexey Gladkov <gladkov.alexey@...il.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        Linux API <linux-api@...r.kernel.org>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        Linux Security Module <linux-security-module@...r.kernel.org>,
        Akinobu Mita <akinobu.mita@...il.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Daniel Micay <danielmicay@...il.com>,
        Djalal Harouni <tixxdz@...il.com>,
        "Dmitry V . Levin" <ldv@...linux.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        "J . Bruce Fields" <bfields@...ldses.org>,
        Jeff Layton <jlayton@...chiereds.net>,
        Jonathan Corbet <corbet@....net>,
        Kees Cook <keescook@...omium.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH v10 2/9] proc: allow to mount many instances of proc in
 one pid namespace

On Thu, Apr 02, 2020 at 10:31:48AM -0500, Eric W. Biederman wrote:
> 
> > diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h
> > index 40a7982b7285..5920a4ecd71b 100644
> > --- a/include/linux/proc_fs.h
> > +++ b/include/linux/proc_fs.h
> > @@ -27,6 +27,17 @@ struct proc_ops {
> >  	unsigned long (*proc_get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
> >  };
> >  
> > +struct proc_fs_info {
> > +	struct pid_namespace *pid_ns;
> > +	struct dentry *proc_self;        /* For /proc/self */
> > +	struct dentry *proc_thread_self; /* For /proc/thread-self */
> > +};
> 
> Minor nit.
> 
> I have not seen a patch where you remove proc_self and proc_thread_self
> from struct pid_namepace.
> 
> Ideally it would have been in this patch.  But as it won't break
> anyone's bisection can you please have a follow up patch that removes
> those fields?

Yep. I miss that. I will make v11 to address this and other nits.

-- 
Rgrds, legion