linux-kernel - Some question about "security context of a task"

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Message-ID: <CANudz+snKSchS6yY8+w9GyogcwstEEAopmESJbLs=hkCSJo5XA@mail.gmail.com>
Date:	Wed, 1 Feb 2012 15:12:06 +0800
From:	loody <miloody@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>,
	kernelnewbies@...nelnewbies.org
Subject: Some question about "security context of a task"

hi all:
I found there is a user_struct, user, located at struct cred.
is it possible be null?
My platform sometimes panic when using kernel_thread to creating a
thread for running.

below is the place it happen

if (atomic_read(&p->real_cred->user->processes) >=
             p->signal->rlim[RLIMIT_NPROC].rlim_cur) {
after checking the parameter, I found p->real_cred->user is NULL.

When and how we allocate/destroy this parameter?
Does that mean we should some basic check before calling kernel_thread?

-- 
Regards,
--
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