Re: [PATCH] getrusage sucks

[Claudio Scordino <cloud.of.andor@gmail.com>]

>
> In which case the only comment I have is the one about accuracy - and
> that is true for procfs too so will only come up if someone gets the
> urge to use perfctr timers for precision resource management

According to your comments, this the final patch. 

Should it be committed ?

         Claudio



diff --git a/kernel/sys.c b/kernel/sys.c
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1746,9 +1746,26 @@ int getrusage(struct task_struct *p, int

 asmlinkage long sys_getrusage(int who, struct rusage __user *ru)
 {
-       if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN)
-               return -EINVAL;
-       return getrusage(current, who, ru);
+        if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN) {
+                struct task_struct* tsk;
+                struct rusage r;
+                read_lock(&tasklist_lock);
+                tsk = find_task_by_pid(who);
+                if (tsk == NULL) {
+                        read_unlock(&tasklist_lock);
+                        return -EINVAL;
+                }
+                if ((current->euid != tsk->euid) &&
+                (current->euid != tsk->uid) &&
+                (!capable(CAP_SYS_ADMIN))){
+                        read_unlock(&tasklist_lock);
+                        return -EPERM;
+                }
+                k_getrusage(tsk, RUSAGE_SELF, &r);
+                read_unlock(&tasklist_lock);
+                return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0;
+        } else
+                return getrusage(current, who, ru);
 }

 asmlinkage long sys_umask(int mask)
-
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