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Date: Thu, 02 Apr 2020 10:31:48 -0500
From: ebiederm@...ssion.com (Eric W. Biederman)
To: Alexey Gladkov <gladkov.alexey@...il.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>, Alexey Gladkov <legion@...nel.org>, 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
> 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?
Thank you,
Eric
> +
> +static inline struct proc_fs_info *proc_sb_info(struct super_block *sb)
> +{
> + return sb->s_fs_info;
> +}
> +
> #ifdef CONFIG_PROC_FS
>
> typedef int (*proc_write_t)(struct file *, char *, size_t);
> @@ -161,6 +172,7 @@ int open_related_ns(struct ns_common *ns,
> /* get the associated pid namespace for a file in procfs */
> static inline struct pid_namespace *proc_pid_ns(const struct inode *inode)
> {
> + return proc_sb_info(inode->i_sb)->pid_ns;
> return inode->i_sb->s_fs_info;
> }
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