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 contianer. 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. 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(-) -- 1.8.2.2 _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/containers
