On Wed, 9 Jan 2002, Behdad Esfahbod wrote:
>
> And why do you think process 555 exists?
Because it's in the /proc directory, and ps shows it.
>
> Does the /proc/self/mem cause the same problem too?
Yes.
>
> On Wed, 9 Jan 2002, Efraim Yawitz wrote:
>
> > What I've been doing is something like 'cat /proc/555/mem' with the
> > problems mentioned.
> >
In any case, I saw the following code in fs/proc/mem.c which I think
answers the question. If I understand correctly, only a parent of the
process can examine its memory. Is that right? Here's the code:
/* Allow accesses only under the same circumstances
* that we would allow ptrace to work.
*/
if (tsk) {
if (!(tsk->flags & PF_PTRACED)
|| tsk->state != TASK_STOPPED
|| tsk->p_pptr != current)
tsk = NULL;
}
Ephraim
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