return sig;
}
-static struct sigqueue *__sigqueue_alloc(struct task_struct *t, unsigned int __nocast flags,
+static struct sigqueue *__sigqueue_alloc(struct task_struct *t, gfp_t flags,
int override_rlimit)
{
struct sigqueue *q = NULL;
* is to alert stop-signal processing code when another
* processor has come along and cleared the flag.
*/
- tsk->signal->flags |= SIGNAL_STOP_DEQUEUED;
+ if (!(tsk->signal->flags & SIGNAL_GROUP_EXIT))
+ tsk->signal->flags |= SIGNAL_STOP_DEQUEUED;
}
if ( signr &&
((info->si_code & __SI_MASK) == __SI_TIMER) &&
/* forward decl */
static void do_notify_parent_cldstop(struct task_struct *tsk,
- struct task_struct *parent,
+ int to_self,
int why);
/*
{
struct task_struct *t;
- if (p->flags & SIGNAL_GROUP_EXIT)
+ if (p->signal->flags & SIGNAL_GROUP_EXIT)
/*
* The process is in the middle of dying already.
*/
p->signal->group_stop_count = 0;
p->signal->flags = SIGNAL_STOP_CONTINUED;
spin_unlock(&p->sighand->siglock);
- if (p->ptrace & PT_PTRACED)
- do_notify_parent_cldstop(p, p->parent,
- CLD_STOPPED);
- else
- do_notify_parent_cldstop(
- p->group_leader,
- p->group_leader->real_parent,
- CLD_STOPPED);
+ do_notify_parent_cldstop(p, (p->ptrace & PT_PTRACED), CLD_STOPPED);
spin_lock(&p->sighand->siglock);
}
rm_from_queue(SIG_KERNEL_STOP_MASK, &p->signal->shared_pending);
p->signal->flags = SIGNAL_STOP_CONTINUED;
p->signal->group_exit_code = 0;
spin_unlock(&p->sighand->siglock);
- if (p->ptrace & PT_PTRACED)
- do_notify_parent_cldstop(p, p->parent,
- CLD_CONTINUED);
- else
- do_notify_parent_cldstop(
- p->group_leader,
- p->group_leader->real_parent,
- CLD_CONTINUED);
+ do_notify_parent_cldstop(p, (p->ptrace & PT_PTRACED), CLD_CONTINUED);
spin_lock(&p->sighand->siglock);
} else {
/*
* as soon as they're available, so putting the signal on the shared queue
* will be equivalent to sending it to one such thread.
*/
-#define wants_signal(sig, p, mask) \
- (!sigismember(&(p)->blocked, sig) \
- && !((p)->state & mask) \
- && !((p)->flags & PF_EXITING) \
- && (task_curr(p) || !signal_pending(p)))
-
+static inline int wants_signal(int sig, struct task_struct *p)
+{
+ if (sigismember(&p->blocked, sig))
+ return 0;
+ if (p->flags & PF_EXITING)
+ return 0;
+ if (sig == SIGKILL)
+ return 1;
+ if (p->state & (TASK_STOPPED | TASK_TRACED))
+ return 0;
+ return task_curr(p) || !signal_pending(p);
+}
static void
__group_complete_signal(int sig, struct task_struct *p)
{
- unsigned int mask;
struct task_struct *t;
- /*
- * Don't bother traced and stopped tasks (but
- * SIGKILL will punch through that).
- */
- mask = TASK_STOPPED | TASK_TRACED;
- if (sig == SIGKILL)
- mask = 0;
-
/*
* Now find a thread we can wake up to take the signal off the queue.
*
* If the main thread wants the signal, it gets first crack.
* Probably the least surprising to the average bear.
*/
- if (wants_signal(sig, p, mask))
+ if (wants_signal(sig, p))
t = p;
else if (thread_group_empty(p))
/*
t = p->signal->curr_target = p;
BUG_ON(t->tgid != p->tgid);
- while (!wants_signal(sig, t, mask)) {
+ while (!wants_signal(sig, t)) {
t = next_thread(t);
if (t == p->signal->curr_target)
/*
return error;
}
+/* like kill_proc_info(), but doesn't use uid/euid of "current" */
+int kill_proc_info_as_uid(int sig, struct siginfo *info, pid_t pid,
+ uid_t uid, uid_t euid)
+{
+ int ret = -EINVAL;
+ struct task_struct *p;
+
+ if (!valid_signal(sig))
+ return ret;
+
+ read_lock(&tasklist_lock);
+ p = find_task_by_pid(pid);
+ if (!p) {
+ ret = -ESRCH;
+ goto out_unlock;
+ }
+ if ((!info || ((unsigned long)info != 1 &&
+ (unsigned long)info != 2 && SI_FROMUSER(info)))
+ && (euid != p->suid) && (euid != p->uid)
+ && (uid != p->suid) && (uid != p->uid)) {
+ ret = -EPERM;
+ goto out_unlock;
+ }
+ if (sig && p->sighand) {
+ unsigned long flags;
+ spin_lock_irqsave(&p->sighand->siglock, flags);
+ ret = __group_send_sig_info(sig, info, p);
+ spin_unlock_irqrestore(&p->sighand->siglock, flags);
+ }
+out_unlock:
+ read_unlock(&tasklist_lock);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(kill_proc_info_as_uid);
/*
* kill_something_info() interprets pid in interesting ways just like kill(2).
unsigned long flags;
int ret = 0;
- /*
- * We need the tasklist lock even for the specific
- * thread case (when we don't need to follow the group
- * lists) in order to avoid races with "p->sighand"
- * going away or changing from under us.
- */
BUG_ON(!(q->flags & SIGQUEUE_PREALLOC));
- read_lock(&tasklist_lock);
+ read_lock(&tasklist_lock);
+
+ if (unlikely(p->flags & PF_EXITING)) {
+ ret = -1;
+ goto out_err;
+ }
+
spin_lock_irqsave(&p->sighand->siglock, flags);
-
+
if (unlikely(!list_empty(&q->list))) {
/*
* If an SI_TIMER entry is already queue just increment
BUG();
q->info.si_overrun++;
goto out;
- }
+ }
/* Short-circuit ignored signals. */
if (sig_ignored(p, sig)) {
ret = 1;
out:
spin_unlock_irqrestore(&p->sighand->siglock, flags);
+out_err:
read_unlock(&tasklist_lock);
- return(ret);
+
+ return ret;
}
int
spin_unlock_irqrestore(&psig->siglock, flags);
}
-static void
-do_notify_parent_cldstop(struct task_struct *tsk, struct task_struct *parent,
- int why)
+static void do_notify_parent_cldstop(struct task_struct *tsk, int to_self, int why)
{
struct siginfo info;
unsigned long flags;
+ struct task_struct *parent;
struct sighand_struct *sighand;
+ if (to_self)
+ parent = tsk->parent;
+ else {
+ tsk = tsk->group_leader;
+ parent = tsk->real_parent;
+ }
+
info.si_signo = SIGCHLD;
info.si_errno = 0;
info.si_pid = tsk->pid;
!(current->ptrace & PT_ATTACHED)) &&
(likely(current->parent->signal != current->signal) ||
!unlikely(current->signal->flags & SIGNAL_GROUP_EXIT))) {
- do_notify_parent_cldstop(current, current->parent,
- CLD_TRAPPED);
+ do_notify_parent_cldstop(current, 1, CLD_TRAPPED);
read_unlock(&tasklist_lock);
schedule();
} else {
static void
finish_stop(int stop_count)
{
+ int to_self;
+
/*
* If there are no other threads in the group, or if there is
* a group stop in progress and we are the last to stop,
* report to the parent. When ptraced, every thread reports itself.
*/
- if (stop_count < 0 || (current->ptrace & PT_PTRACED)) {
- read_lock(&tasklist_lock);
- do_notify_parent_cldstop(current, current->parent,
- CLD_STOPPED);
- read_unlock(&tasklist_lock);
- }
- else if (stop_count == 0) {
- read_lock(&tasklist_lock);
- do_notify_parent_cldstop(current->group_leader,
- current->group_leader->real_parent,
- CLD_STOPPED);
- read_unlock(&tasklist_lock);
- }
+ if (stop_count < 0 || (current->ptrace & PT_PTRACED))
+ to_self = 1;
+ else if (stop_count == 0)
+ to_self = 0;
+ else
+ goto out;
+ read_lock(&tasklist_lock);
+ do_notify_parent_cldstop(current, to_self, CLD_STOPPED);
+ read_unlock(&tasklist_lock);
+
+out:
schedule();
/*
* Now we don't run again until continued.
* stop is always done with the siglock held,
* so this check has no races.
*/
- if (t->state < TASK_STOPPED) {
+ if (!t->exit_state &&
+ !(t->state & (TASK_STOPPED|TASK_TRACED))) {
stop_count++;
signal_wake_up(t, 0);
}
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
- current->state = TASK_INTERRUPTIBLE;
- timeout = schedule_timeout(timeout);
+ timeout = schedule_timeout_interruptible(timeout);
try_to_freeze();
spin_lock_irq(¤t->sighand->siglock);
Code Review / linux-3.10.git / blobdiff