linux-kernel - [PATCH v6 0/4] cgroup: add xattr support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 16 Aug 2012 13:44:53 -0400
From:	aris@...hat.com
To:	linux-kernel@...r.kernel.org
Cc:	cgroups@...r.kernel.org, Li Zefan <lizefan@...wei.com>,
	Tejun Heo <tj@...nel.org>, Hugh Dickins <hughd@...gle.com>,
	Hillf Danton <dhillf@...il.com>,
	Lennart Poettering <lpoetter@...hat.com>
Subject: [PATCH v6 0/4] cgroup: add xattr support

This series are a refreshed version of a patchset submitted by Li Zefan back
in march:
	https://lkml.org/lkml/2012/3/1/13

With Li's permission, I refreshed the patches to apply over the latest upstream
and added the modifications suggested by others in the thread:
- using a mount option instead of config option to enable the xattr support
- reinitialize the list in kmem_xattrs_free()
- renamed functions to simple_xattr_*()

There're two users for this patchset:
- SELinux: to be able to control access to cgroupfs inside containers
- systemd: to store meta information such as main PID in a service cgroup,
  set specific services special options in the cgroup.

While the xattrs will use kernel memory like tmpfs, they're restricted to
'security' (which controls the format of the value) and 'trusted' (which
requires CAP_SYS_ADMIN). If kernel memory usage is still a concern, we're
not far from having memcg account for kernel memory.

v6:
- only allow trusted and security
- replace subsys_bits by something more meaningful
v5:
- check for permissions for user xattr namespace
v4:
- implemented requested changes by Tejun Heo in patch #2

Cc: Li Zefan <lizefan@...wei.com>
Cc: Tejun Heo <tj@...nel.org>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: Hillf Danton <dhillf@...il.com>
Cc: Lennart Poettering <lpoetter@...hat.com>
Signed-off-by: Li Zefan <lizefan@...wei.com>
Signed-off-by: Aristeu Rozanski <aris@...hat.com>

-- 
Aristeu
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/