kernel BUG at kernel/cred.c:434!

Casey Schaufler casey at
Wed Apr 17 15:39:55 UTC 2019

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.

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