kernel BUG at kernel/cred.c:434!

[Casey Schaufler]

On 4/17/2019 7:57 AM, Oleg Nesterov wrote:
> On 04/17, Paul Moore wrote:
>> I'm tempted to simply return an error in selinux_setprocattr() if
>> the task's credentials are not the same as its real_cred;
> What about other modules? I have no idea what smack_setprocattr() is,
> but it too does prepare_creds/commit creds.

For what it's worth, my test for Smack does not reproduce
the problem.

>
> it seems that the simplest workaround should simply add the additional
> cred == real_cred into proc_pid_attr_write().
>
> Oleg.
>