[PATCH 5/5] pid: use namespaced iteration on processes while managing priority

[Serge E. Hallyn]

Quoting Gowrishankar M (gowrishankar.m at linux.vnet.ibm.com):
> From: Gowrishankar M <gomuthuk at linux.vnet.ibm.com>
> 
> At present we scan all processes in init namespace, while getting or setting
> process priorities for a user. Incase of PID namespace, it leads to leak
> priority to processes in other namespace.
> 
> Below patch proposes to use new macro controller to fix the boundary of
> processes list in current namespace.
> 
> Signed-off-by: Gowrishankar M <gowrishankar.m at linux.vnet.ibm.com>

Acked-by: Serge Hallyn <serue at us.ibm.com>

> ---
>  kernel/sys.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/sys.c b/kernel/sys.c
> index 31deba8..50973de 100644
> --- a/kernel/sys.c
> +++ b/kernel/sys.c
> @@ -181,7 +181,7 @@ asmlinkage long sys_setpriority(int which, int who, int niceval)
>  				if ((who != current->uid) && !(user = find_user(who)))
>  					goto out_unlock;	/* No processes for this user */
> 
> -			do_each_thread(g, p)
> +			do_each_thread_in_ns(g, p, current->nsproxy->pid_ns)
>  				if (p->uid == who)
>  					error = set_one_prio(p, niceval, error);
>  			while_each_thread(g, p);
> @@ -243,7 +243,7 @@ asmlinkage long sys_getpriority(int which, int who)
>  				if ((who != current->uid) && !(user = find_user(who)))
>  					goto out_unlock;	/* No processes for this user */
> 
> -			do_each_thread(g, p)
> +			do_each_thread_in_ns(g, p, current->nsproxy->pid_ns)
>  				if (p->uid == who) {
>  					niceval = 20 - task_nice(p);
>  					if (niceval > retval)
> -- 
> 1.5.5.1