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Isolate some explicit usage of task->tgid

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With pid namespaces this field is now dangerous to use explicitly, so hide
it behind the helpers.

Also the pid and pgrp fields o task_struct and signal_struct are to be
deprecated.  Unfortunately this patch cannot be sent right now as this
leads to tons of warnings, so start isolating them, and deprecate later.

Actually the p->tgid == pid has to be changed to has_group_leader_pid(),
but Oleg pointed out that in case of posix cpu timers this is the same, and
thread_group_leader() is more preferable.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Acked-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Pavel Emelyanov 2007-10-18 23:40:18 -07:00 • committed by Linus Torvalds
parent 19b9b9b54e
commit bac0abd617
8 changed files with 20 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

12
kernel/posix-cpu-timers.c
View file

@ -21,8 +21,8 @@ static int check_clock(const clockid_t which_clock)
read_lock(&tasklist_lock);
p = find_task_by_pid(pid);
if (!p || (CPUCLOCK_PERTHREAD(which_clock) ?
p->tgid != current->tgid : p->tgid != pid)) {
if (!p || !(CPUCLOCK_PERTHREAD(which_clock) ?
same_thread_group(p, current) : thread_group_leader(p))) {
error = -EINVAL;
}
read_unlock(&tasklist_lock);
@ -308,13 +308,13 @@ int posix_cpu_clock_get(const clockid_t which_clock, struct timespec *tp)
p = find_task_by_pid(pid);
if (p) {
if (CPUCLOCK_PERTHREAD(which_clock)) {
if (p->tgid == current->tgid) {
if (same_thread_group(p, current)) {
error = cpu_clock_sample(which_clock,
p, &rtn);
}
} else {
read_lock(&tasklist_lock);
if (p->tgid == pid && p->signal) {
if (thread_group_leader(p) && p->signal) {
error =
cpu_clock_sample_group(which_clock,
p, &rtn);
@ -355,7 +355,7 @@ int posix_cpu_timer_create(struct k_itimer *new_timer)
p = current;
} else {
p = find_task_by_pid(pid);
if (p && p->tgid != current->tgid)
if (p && !same_thread_group(p, current))
p = NULL;
}
} else {
@ -363,7 +363,7 @@ int posix_cpu_timer_create(struct k_itimer *new_timer)
p = current->group_leader;
} else {
p = find_task_by_pid(pid);
if (p && p->tgid != pid)
if (p && !thread_group_leader(p))
p = NULL;
}
}