Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
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Date: Fri, 4 Oct 2013 16:08:06 -0700
From: Andy Lutomirski <>
To: "Eric W. Biederman" <>
Cc: Djalal Harouni <>, Kees Cook <>, 
	Al Viro <>, Andrew Morton <>, 
	Linus Torvalds <>, Ingo Molnar <>, 
	"Serge E. Hallyn" <>, Cyrill Gorcunov <>, 
	David Rientjes <>, LKML <>, 
	Linux FS Devel <>, 
	"" <>, Djalal Harouni <>
Subject: Re: [PATCH v2 2/9] procfs: add proc_allow_access() to check if file's
 opener may access task

On Fri, Oct 4, 2013 at 3:59 PM, Andy Lutomirski <> wrote:
> I'd really like a solution where there are no read or write
> implementations in the entire kernel that check permissions.  Failing
> that, just getting it for procfs would be nice.  (uid_map, etc will
> probably need to be revoked on unshare for this to work.)

By "check permissions" I mean using anything but f_cred.

uid_map won't need any form of revoke, though -- the stuct file
already points at a particular target ns.  I wonder why the
CAP_SYS_ADMIN check is in map_write instead of open, though.


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