[PATCH] Fix signal sending in usbdevio on async URB completion

[uclinux-h8/linux.git] / kernel / signal.c

diff --git a/kernel/signal.c b/kernel/signal.c
index cba193c..50c9926 100644 (file)
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1193,6 +1193,40 @@ kill_proc_info(int sig, struct siginfo *info, pid_t pid)
        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).