linux-kernel - Re: [tip:perfcounters/core] perf_counter: Use PID namespaces properly

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20090602154816.GA15734@redhat.com>
Date:	Tue, 2 Jun 2009 17:55:30 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	tip-bot for Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-tip-commits@...r.kernel.org, linux-kernel@...r.kernel.org,
	acme@...hat.com, paulus@...ba.org, hpa@...or.com, mingo@...hat.com,
	jkacur@...hat.com, efault@....de, ebiederm@...ssion.com,
	mtosatti@...hat.com, tglx@...utronix.de,
	cjashfor@...ux.vnet.ibm.com, mingo@...e.hu
Subject: Re: [tip:perfcounters/core] perf_counter: Use PID namespaces
	properly

On 06/02, tip-bot for Peter Zijlstra wrote:
>
> +static u32 perf_counter_pid(struct perf_counter *counter, struct task_struct *p)
> +{
> +	/*
> +	 * only top level counters have the pid namespace they were created in
> +	 */
> +	if (counter->parent)
> +		counter = counter->parent;
> +
> +	return task_tgid_nr_ns(p, counter->ns);
> +}
> +
> +static u32 perf_counter_tid(struct perf_counter *counter, struct task_struct *p)
> +{
> +	/*
> +	 * only top level counters have the pid namespace they were created in
> +	 */
> +	if (counter->parent)
> +		counter = counter->parent;
> +
> +	return task_pid_nr_ns(p, counter->ns);

Perhaps this should be

	return task_pid_nr_ns(p->group_leader);

?

> +		tid_entry.pid = perf_counter_pid(counter, current);
> +		tid_entry.tid = perf_counter_tid(counter, current);


Otherwise we seem to always report .pid == .tid

Oleg.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/