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pid namespaces: changes to show virtual ids to user

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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.

[[email protected]: build fix]
[[email protected]: nuther build fix]
[[email protected]: yet nuther build fix]
[[email protected]: remove unneeded casts]
Signed-off-by: Pavel Emelyanov <[email protected]>
Signed-off-by: Alexey Dobriyan <[email protected]>
Cc: Sukadev Bhattiprolu <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Paul Menage <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Pavel Emelyanov 2007-10-18 23:40:14 -07:00 • committed by Linus Torvalds
commit b488893a39
32 changed files with 241 additions and 144 deletions
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7
ipc/mqueue.c
View file

@ -29,6 +29,8 @@
#include <linux/audit.h>
#include <linux/signal.h>
#include <linux/mutex.h>
#include <linux/nsproxy.h>
#include <linux/pid.h>
#include <net/sock.h>
#include "util.h"
@ -330,7 +332,8 @@ static ssize_t mqueue_read_file(struct file *filp, char __user *u_data,
(info->notify_owner &&
info->notify.sigev_notify == SIGEV_SIGNAL) ?
info->notify.sigev_signo : 0,
pid_nr(info->notify_owner));
pid_nr_ns(info->notify_owner,
current->nsproxy->pid_ns));
spin_unlock(&info->lock);
buffer[sizeof(buffer)-1] = '\0';
slen = strlen(buffer)+1;
@ -507,7 +510,7 @@ static void __do_notify(struct mqueue_inode_info *info)
sig_i.si_errno = 0;
sig_i.si_code = SI_MESGQ;
sig_i.si_value = info->notify.sigev_value;
sig_i.si_pid = current->tgid;
sig_i.si_pid = task_pid_vnr(current);
sig_i.si_uid = current->uid;
kill_pid_info(info->notify.sigev_signo,