linux-kernel - Re: [RFC][PATCH v4] procfs: Always expose /proc/<pid>/map

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Message-ID: <20150428222353.GA1296680@mail.thefacebook.com>
Date:	Tue, 28 Apr 2015 15:23:53 -0700
From:	Calvin Owens <calvinowens@...com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
CC:	"Kirill A. Shutemov" <kirill@...temov.name>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Peter Feiner <pfeiner@...gle.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Siddhesh Poyarekar <siddhesh.poyarekar@...il.com>,
	<linux-kernel@...r.kernel.org>, <kernel-team@...com>,
	Pavel Emelyanov <xemul@...nvz.org>, <calvinowens@...com>
Subject: Re: [RFC][PATCH v4] procfs: Always expose /proc/<pid>/map_files/ and
 make it readable

On Wednesday 03/11 at 01:17 +0300, Cyrill Gorcunov wrote:
> On Sat, Feb 14, 2015 at 12:40:09PM -0800, Calvin Owens wrote:
> > Currently, /proc/<pid>/map_files/ is restricted to CAP_SYS_ADMIN, and
> > is only exposed if CONFIG_CHECKPOINT_RESTORE is set. This interface is
> > very useful for enumerating the files mapped into a process when the
> > more verbose information in /proc/<pid>/maps is not needed. It also
> > allows access to file descriptors for files that have been deleted and
> > closed but are still mmapped into a process, which can be very useful
> > for introspection and debugging.
> 
> Guys, I'm really-really sorry for not replying the email that long.
> If I understand correctly all concerns were addressed, right?

Ping!

I thought everybody was happy after the permission check was changed
to be PTRACE_MODE_ATTACH. But I'll resend one more time if you prefer.

Thanks,
Calvin
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