linux-kernel - Re: [PATCH v2] Introduce v3 namespaced file capabilities

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Date:   Sat, 29 Apr 2017 13:22:52 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     "Serge E. Hallyn" <serge@...lyn.com>
Cc:     Seth Forshee <seth.forshee@...onical.com>,
        lkml <linux-kernel@...r.kernel.org>, linux-api@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Kees Cook <keescook@...omium.org>,
        Andreas Gruenbacher <agruenba@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        "Andrew G. Morgan" <morgan@...nel.org>
Subject: Re: [PATCH v2] Introduce v3 namespaced file capabilities


"Serge E. Hallyn" <serge@...lyn.com> writes:

[snip]
> A patch to linux-test-project adding a new set of tests for this
> functionality is in the nsfscaps branch at github.com/hallyn/ltp
>
> Changelog:
>    Nov 02 2016: fix invalid check at refuse_fcap_overwrite()
>    Nov 07 2016: convert rootid from and to fs user_ns
>    (From ebiederm: mar 28 2017)
>      commoncap.c: fix typos - s/v4/v3
>      get_vfs_caps_from_disk: clarify the fs_ns root access check
>      nsfscaps: change the code split for cap_inode_setxattr()
>    Apr 09 2017:
>        don't return v3 cap for caps owned by current root.
>       return a v2 cap for a true v2 cap in non-init ns
>    Apr 18 2017:
>       . Change the flow of fscap writing to support s_user_ns writing.
>       . Remove refuse_fcap_overwrite().  The value of the previous
>         xattr doesn't matter.
>    Apr 24 2017:
>       . incorporate Eric's incremental diff
>       . move cap_convert_nscap to setxattr and simplify its usage
> ---
>  fs/xattr.c                      |   6 +
>  include/linux/capability.h      |   3 +-
>  include/linux/security.h        |   2 +
>  include/uapi/linux/capability.h |  22 +++-
>  security/commoncap.c            | 269 +++++++++++++++++++++++++++++++++++++---
>  5 files changed, 279 insertions(+), 23 deletions(-)
>

Grrr.  No Signed-off-by: again.

Eric