On 12/24, Stijn Volckaert wrote:
>
> The question now is whether or not it's the security module's
> responsibility to check whether a tracee relationship is already in
> place or if ptrace itself should do it.
Honestly, I have no idea
> --- a/kernel/ptrace.c 2014-12-24 13:53:23.055346526 +0100
> +++ b/kernel/ptrace.c 2014-12-24 14:17:20.617824840 +0100
> @@ -232,6 +232,9 @@ static int __ptrace_may_access(struct ta
> /* Don't let security modules deny introspection */
> if (same_thread_group(task, current))
> return 0;
> + /* Don't deny introspection to already attached ptracer */
> + if (!ptrace_check_attach(task, true))
> + return 0;
Perhaps this makes sense, probably security checks do not make sense
if the target is traced.
But in this case I'd suggest to simply
if (ptrace_parent(task) == current)
return 0;
Oleg.
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