Re: [PATCH 0/9] Add namespace support for syslog v2
From: Gu Zheng
Date: Mon Jul 29 2013 - 05:37:21 EST
On 07/29/2013 10:31 AM, Rui Xiang wrote:
> This patchset introduces a system log namespace.
> It is the 2nd version. The link of the 1st version is
> http://lwn.net/Articles/525728/. In that version, syslog_
> namespace was added into nsproxy and created through a new
> clone flag CLONE_SYSLOG when cloning a process.
> There were some discussion in last November about the 1st
> version. This version used these important advice, and
> referred to Serge's patch(http://lwn.net/Articles/525629/).
> Unlike the 1st version, in this patchset, syslog namespace
> is tied to a user namespace. Add we must create a new user
> ns before create a new syslog ns, because that will make
> users have full capabilities in this new userns after
> cloning a new user ns. The syslog namespace can be created
> through a new command(11) to __NR_syslog syscall. That owe
> to a new syslog flag SYSLOG_ACTION_NEW_NS.
> In syslog_namespace, some necessary identifiers for handling
> syslog buf are containerized. When one container creates a
> new syslog ns, individual buf will be allocated to store log
> ownned this container.
> A new interface ns_printk is added to print the logs which
> we want to see in the container. Through ns_printk, we can
> get more logs related to a specific net ns, for instance,
> iptables. Here we use it to report iptable logs per
> Then default printk targeted at the init_syslog_ns will
> continue to print out most kernel log to host.
> One task in a new syslog ns could affect only current
> container through "dmesg", "dmesg -c" and /dev/kmsg
> actions. The read/write interface such as /dev/kmsg,
> /pro/kmsg and syslog syscall continue to be useful for
> container users.
> This patchset is based on linus' linux tree.
Changelog details between V2 and V1 is seriously needed, the inline description
is not easy reading for other guys.
> Rui Xiang (9):
> syslog_ns: add syslog_namespace and put/get_syslog_ns
> syslog_ns: add syslog_ns into user_namespace
> syslog_ns: add init syslog_ns for global syslog
> syslog_ns: make syslog handling per namespace
> syslog_ns: make permisiion check per user namespace
> syslog_ns: use init syslog_ns for console action
> syslog_ns: implement function for creating syslog ns
> syslog_ns: implement ns_printk for specific syslog_ns
> netfilter: use ns_printk in iptable context
> fs/proc/kmsg.c | 17 +-
> include/linux/printk.h | 5 +-
> include/linux/syslog.h | 79 ++++-
> include/linux/user_namespace.h | 2 +
> include/net/netfilter/xt_log.h | 6 +-
> kernel/printk.c | 642 ++++++++++++++++++++++++-----------------
> kernel/sysctl.c | 3 +-
> kernel/user.c | 3 +
> kernel/user_namespace.c | 4 +
> net/netfilter/xt_LOG.c | 4 +-
> 10 files changed, 493 insertions(+), 272 deletions(-)
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