linux-kernel - [PATCH 1/5] pid: get pid_t ppid of task in init_pid

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: <c6524d385bffe974c071e46f8b1c9b1df69a7d9d.1387834776.git.rgb@redhat.com>
Date:	Mon, 23 Dec 2013 17:27:35 -0500
From:	Richard Guy Briggs <rgb@...hat.com>
To:	linux-audit@...hat.com, linux-kernel@...r.kernel.org
Cc:	Richard Guy Briggs <rgb@...hat.com>,
	Eric Paris <eparis@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Oleg Nesterov <oleg@...hat.com>, stable@...r.kernel.org
Subject: [PATCH 1/5] pid: get pid_t ppid of task in init_pid_ns

Added the functions task_ppid_nr_ns() and task_ppid_nr() to abstract the lookup
of the PPID (real_parent's pid_t) of a process, including rcu locking, in the
arbitrary and init_pid_ns.
This provides an alternative to sys_getppid(), which is relative to the child
process' pid namespace.

(informed by ebiederman's 6c621b7e)
Cc: stable@...r.kernel.org
Cc: Eric W. Biederman <ebiederm@...ssion.com>
Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
---
 include/linux/sched.h |   24 ++++++++++++++++++++++++
 1 files changed, 24 insertions(+), 0 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index e27baee..7bf5ab2 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1497,6 +1497,30 @@ static inline pid_t task_tgid_vnr(struct task_struct *tsk)
 }
 
 
+static inline pid_t task_ppid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
+{
+	pid_t pid;
+
+	rcu_read_lock();
+	pid = pid_alive(tsk) ?
+		task_pid_nr_ns(rcu_dereference(tsk->real_parent), ns) : 0;
+	rcu_read_unlock();
+
+	return pid;
+}
+
+static inline pid_t task_ppid_nr(struct task_struct *tsk)
+{
+	pid_t pid;
+
+	rcu_read_lock();
+	pid = pid_alive(tsk) ?
+		task_pid_nr(rcu_dereference(tsk->real_parent)) : 0;
+	rcu_read_unlock();
+
+	return pid;
+}
+
 static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
 					struct pid_namespace *ns)
 {
-- 
1.7.1

--
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/