From b488893a390edfe027bae7a46e9af8083e740668 Mon Sep 17 00:00:00 2001 From: Pavel Emelyanov Date: Thu, 18 Oct 2007 23:40:14 -0700 Subject: pid namespaces: changes to show virtual ids to user This is the largest patch in the set. Make all (I hope) the places where the pid is shown to or get from user operate on the virtual pids. The idea is: - all in-kernel data structures must store either struct pid itself or the pid's global nr, obtained with pid_nr() call; - when seeking the task from kernel code with the stored id one should use find_task_by_pid() call that works with global pids; - when showing pid's numerical value to the user the virtual one should be used, but however when one shows task's pid outside this task's namespace the global one is to be used; - when getting the pid from userspace one need to consider this as the virtual one and use appropriate task/pid-searching functions. [akpm@linux-foundation.org: build fix] [akpm@linux-foundation.org: nuther build fix] [akpm@linux-foundation.org: yet nuther build fix] [akpm@linux-foundation.org: remove unneeded casts] Signed-off-by: Pavel Emelyanov Signed-off-by: Alexey Dobriyan Cc: Sukadev Bhattiprolu Cc: Oleg Nesterov Cc: Paul Menage Cc: "Eric W. Biederman" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- ipc/shm.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'ipc/shm.c') diff --git a/ipc/shm.c b/ipc/shm.c index 5fc5cf50cf1b..b9d272900a1e 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -168,7 +168,7 @@ static void shm_open(struct vm_area_struct *vma) shp = shm_lock(sfd->ns, sfd->id); BUG_ON(!shp); shp->shm_atim = get_seconds(); - shp->shm_lprid = current->tgid; + shp->shm_lprid = task_tgid_vnr(current); shp->shm_nattch++; shm_unlock(shp); } @@ -213,7 +213,7 @@ static void shm_close(struct vm_area_struct *vma) /* remove from the list of attaches of the shm segment */ shp = shm_lock(ns, sfd->id); BUG_ON(!shp); - shp->shm_lprid = current->tgid; + shp->shm_lprid = task_tgid_vnr(current); shp->shm_dtim = get_seconds(); shp->shm_nattch--; if(shp->shm_nattch == 0 && @@ -392,7 +392,7 @@ static int newseg (struct ipc_namespace *ns, key_t key, int shmflg, size_t size) if(id == -1) goto no_id; - shp->shm_cprid = current->tgid; + shp->shm_cprid = task_tgid_vnr(current); shp->shm_lprid = 0; shp->shm_atim = shp->shm_dtim = 0; shp->shm_ctim = get_seconds(); -- cgit v1.2.3-59-g8ed1b