Resending with complete cc list. Sukadev Bhattiprolu [sukadev@xxxxxxxxxxxxxxxxxx] wrote: | This and following patch were discussed a couple of times but I | did not see any objections to them. The ns_of_pid() introduced | here will also be used in a follow-on patch to fix si_pid from | mqueue. | | --- | From: Sukadev Bhattiprolu <sukadev@xxxxxxxxxxxxxxxxxx> | Date: Fri, 12 Dec 2008 11:44:55 -0800 | Subject: [PATCH 1/2] pid: Implement ns_of_pid | | A current problem with the pid namespace is that it is | easy to do pid related work after exit_task_namespaces which | drops the nsproxy pointer. | | However if we are doing pid namespace related work we are | always operating on some struct pid which retains the pid_namespace | pointer of the pid namespace it was allocated in. | | So provide ns_of_pid which allows us to find the pid | namespace a pid was allocated in. | | Using this we have the needed infrastructure to do pid | namespace related work at anytime we have a struct pid, | removing the chance of accidentally having a NULL | pointer dereference when accessing current->nsproxy. | | Signed-off-by: Eric W. Biederman <ebiederm@xxxxxxxxxxxx> | --- | include/linux/pid.h | 11 +++++++++++ | 1 files changed, 11 insertions(+), 0 deletions(-) | | diff --git a/include/linux/pid.h b/include/linux/pid.h | index d7e98ff..e9aec85 100644 | --- a/include/linux/pid.h | +++ b/include/linux/pid.h | @@ -122,6 +122,17 @@ int next_pidmap(struct pid_namespace *pid_ns, int last); | extern struct pid *alloc_pid(struct pid_namespace *ns); | extern void free_pid(struct pid *pid); | | +/* ns_of_pid returns the pid namespace in which the specified | + * pid was allocated. | + */ | +static inline struct pid_namespace *ns_of_pid(struct pid *pid) | +{ | + struct pid_namespace *ns = NULL; | + if (pid) | + ns = pid->numbers[pid->level].ns; | + return ns; | +} | + | /* | * the helpers to get the pid's id seen from different namespaces | * | -- | 1.5.2.5 | _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers