H i all,
You will get an error when trying to call ptrace system call on kernel threads.
In code, you have the following check:
static int ptrace_attach(struct task_struct *task, long request,
unsigned long addr,
unsigned long flags)
{
...
retval = -EPERM;
if (unlikely(task->flags & PF_KTHREAD))
goto out;
...
see: http://lxr.free-electrons.com/source/kernel/ptrace.c#L233
Question: what is the reason that kernel threads cannot be traced while
userspace threads can be traced ?
rgs,
Kevin
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