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From: Richard Guy Briggs <rgb@redhat.com>
To: containers@lists.linux-foundation.org, linux-api@vger.kernel.org,
	Linux-Audit Mailing List <linux-audit@redhat.com>,
	linux-fsdevel@vger.kernel.org,
	LKML <linux-kernel@vger.kernel.org>,
	netdev@vger.kernel.org, netfilter-devel@vger.kernel.org
Cc: Paul Moore <paul@paul-moore.com>,
	sgrubb@redhat.com, omosnace@redhat.com, dhowells@redhat.com,
	simo@redhat.com, eparis@parisplace.org, serge@hallyn.com,
	ebiederm@xmission.com, nhorman@tuxdriver.com, dwalsh@redhat.com,
	mpatel@redhat.com, Richard Guy Briggs <rgb@redhat.com>
Subject: [PATCH ghak90 V7 15/21] sched: pull task_is_descendant into kernel/sched/core.c
Date: Wed, 18 Sep 2019 21:22:32 -0400
Message-ID: <ff8a73c7841ef788c60f13f90d036b321af0e431.1568834524.git.rgb@redhat.com> (raw)
In-Reply-To: <cover.1568834524.git.rgb@redhat.com>
In-Reply-To: <cover.1568834524.git.rgb@redhat.com>

Since the task_is_descendant() function is used in YAMA and in audit,
pull the function into kernel/core/sched.c

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
---
 include/linux/sched.h    |  3 +++
 kernel/audit.c           | 33 ---------------------------------
 kernel/sched/core.c      | 33 +++++++++++++++++++++++++++++++++
 security/yama/yama_lsm.c | 33 ---------------------------------
 4 files changed, 36 insertions(+), 66 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index a936d162513a..b251f018f4db 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1988,4 +1988,7 @@ static inline void rseq_syscall(struct pt_regs *regs)
 
 const struct cpumask *sched_trace_rd_span(struct root_domain *rd);
 
+extern int task_is_descendant(struct task_struct *parent,
+			      struct task_struct *child);
+
 #endif
diff --git a/kernel/audit.c b/kernel/audit.c
index 69fe1e9af7cb..4fe7678304dd 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -2560,39 +2560,6 @@ static struct task_struct *audit_cont_owner(struct task_struct *tsk)
 }
 
 /*
- * task_is_descendant - walk up a process family tree looking for a match
- * @parent: the process to compare against while walking up from child
- * @child: the process to start from while looking upwards for parent
- *
- * Returns 1 if child is a descendant of parent, 0 if not.
- */
-static int task_is_descendant(struct task_struct *parent,
-			      struct task_struct *child)
-{
-	int rc = 0;
-	struct task_struct *walker = child;
-
-	if (!parent || !child)
-		return 0;
-
-	rcu_read_lock();
-	if (!thread_group_leader(parent))
-		parent = rcu_dereference(parent->group_leader);
-	while (walker->pid > 0) {
-		if (!thread_group_leader(walker))
-			walker = rcu_dereference(walker->group_leader);
-		if (walker == parent) {
-			rc = 1;
-			break;
-		}
-		walker = rcu_dereference(walker->real_parent);
-	}
-	rcu_read_unlock();
-
-	return rc;
-}
-
-/*
  * audit_set_contid - set current task's audit contid
  * @task: target task
  * @contid: contid value
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 2b037f195473..7ba9e07381fa 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -7509,6 +7509,39 @@ void dump_cpu_task(int cpu)
 }
 
 /*
+ * task_is_descendant - walk up a process family tree looking for a match
+ * @parent: the process to compare against while walking up from child
+ * @child: the process to start from while looking upwards for parent
+ *
+ * Returns 1 if child is a descendant of parent, 0 if not.
+ */
+int task_is_descendant(struct task_struct *parent,
+			      struct task_struct *child)
+{
+	int rc = 0;
+	struct task_struct *walker = child;
+
+	if (!parent || !child)
+		return 0;
+
+	rcu_read_lock();
+	if (!thread_group_leader(parent))
+		parent = rcu_dereference(parent->group_leader);
+	while (walker->pid > 0) {
+		if (!thread_group_leader(walker))
+			walker = rcu_dereference(walker->group_leader);
+		if (walker == parent) {
+			rc = 1;
+			break;
+		}
+		walker = rcu_dereference(walker->real_parent);
+	}
+	rcu_read_unlock();
+
+	return rc;
+}
+
+/*
  * Nice levels are multiplicative, with a gentle 10% change for every
  * nice level changed. I.e. when a CPU-bound task goes from nice 0 to
  * nice 1, it will get ~10% less CPU time than another CPU-bound task
diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c
index 94dc346370b1..25eae205eae8 100644
--- a/security/yama/yama_lsm.c
+++ b/security/yama/yama_lsm.c
@@ -263,39 +263,6 @@ static int yama_task_prctl(int option, unsigned long arg2, unsigned long arg3,
 }
 
 /**
- * task_is_descendant - walk up a process family tree looking for a match
- * @parent: the process to compare against while walking up from child
- * @child: the process to start from while looking upwards for parent
- *
- * Returns 1 if child is a descendant of parent, 0 if not.
- */
-static int task_is_descendant(struct task_struct *parent,
-			      struct task_struct *child)
-{
-	int rc = 0;
-	struct task_struct *walker = child;
-
-	if (!parent || !child)
-		return 0;
-
-	rcu_read_lock();
-	if (!thread_group_leader(parent))
-		parent = rcu_dereference(parent->group_leader);
-	while (walker->pid > 0) {
-		if (!thread_group_leader(walker))
-			walker = rcu_dereference(walker->group_leader);
-		if (walker == parent) {
-			rc = 1;
-			break;
-		}
-		walker = rcu_dereference(walker->real_parent);
-	}
-	rcu_read_unlock();
-
-	return rc;
-}
-
-/**
  * ptracer_exception_found - tracer registered as exception for this tracee
  * @tracer: the task_struct of the process attempting ptrace
  * @tracee: the task_struct of the process to be ptraced
-- 
1.8.3.1


  parent reply index

Thread overview: 69+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-19  1:22 [PATCH ghak90 V7 00/21] audit: implement container identifier Richard Guy Briggs
2019-09-19  1:22 ` [PATCH ghak90 V7 01/21] audit: collect audit task parameters Richard Guy Briggs
2019-09-19  1:22 ` [PATCH ghak90 V7 02/21] audit: add container id Richard Guy Briggs
2019-09-19  1:22 ` [PATCH ghak90 V7 03/21] audit: read container ID of a process Richard Guy Briggs
2019-09-19  1:22 ` [PATCH ghak90 V7 04/21] audit: convert to contid list to check for orch/engine ownership Richard Guy Briggs
2019-09-26 14:46   ` Neil Horman
2019-10-25 20:00     ` Richard Guy Briggs
2019-10-28 12:20       ` Neil Horman
2019-10-11  0:38   ` Paul Moore
2019-10-25 21:00     ` Richard Guy Briggs
2019-11-08 18:26       ` Paul Moore
2019-09-19  1:22 ` [PATCH ghak90 V7 05/21] audit: log drop of contid on exit of last task Richard Guy Briggs
2019-10-11  0:38   ` Paul Moore
2019-10-25 19:43     ` Richard Guy Briggs
2019-09-19  1:22 ` [PATCH ghak90 V7 06/21] audit: contid limit of 32k imposed to avoid DoS Richard Guy Briggs
2019-09-27 12:51   ` Neil Horman
2019-10-11  0:38     ` Paul Moore
2019-10-24 21:23       ` Richard Guy Briggs
2019-11-08 17:49         ` Paul Moore
2019-10-25 20:15     ` Richard Guy Briggs
2019-09-19  1:22 ` [PATCH ghak90 V7 07/21] audit: log container info of syscalls Richard Guy Briggs
2019-09-19  1:22 ` [PATCH ghak90 V7 08/21] audit: add contid support for signalling the audit daemon Richard Guy Briggs
2019-10-11  0:39   ` Paul Moore
2019-10-25 19:20     ` Richard Guy Briggs
2019-11-08 17:41       ` Paul Moore
2019-09-19  1:22 ` [PATCH ghak90 V7 09/21] audit: add support for non-syscall auxiliary records Richard Guy Briggs
2019-09-19  1:22 ` [PATCH ghak90 V7 10/21] audit: add containerid support for user records Richard Guy Briggs
2019-09-19  1:22 ` [PATCH ghak90 V7 11/21] audit: add containerid filtering Richard Guy Briggs
2019-09-19  1:22 ` [PATCH ghak90 V7 12/21] audit: add support for containerid to network namespaces Richard Guy Briggs
2019-10-11  0:39   ` Paul Moore
2019-09-19  1:22 ` [PATCH ghak90 V7 13/21] audit: NETFILTER_PKT: record each container ID associated with a netNS Richard Guy Briggs
2019-10-11  0:39   ` Paul Moore
2019-09-19  1:22 ` [PATCH ghak90 V7 14/21] audit: contid check descendancy and nesting Richard Guy Briggs
2019-10-11  0:40   ` Paul Moore
2019-10-24 22:08     ` Richard Guy Briggs
2019-10-30 20:32       ` Paul Moore
2019-09-19  1:22 ` Richard Guy Briggs [this message]
2019-10-11  0:40   ` [PATCH ghak90 V7 15/21] sched: pull task_is_descendant into kernel/sched/core.c Paul Moore
2019-09-19  1:22 ` [PATCH ghak90 V7 16/21] audit: add support for contid set/get by netlink Richard Guy Briggs
2019-10-11  0:40   ` Paul Moore
2019-09-19  1:22 ` [PATCH ghak90 V7 17/21] audit: add support for loginuid/sessionid " Richard Guy Briggs
2019-10-11  0:40   ` Paul Moore
2019-09-19  1:22 ` [PATCH ghak90 V7 18/21] audit: track container nesting Richard Guy Briggs
2019-10-11  0:40   ` Paul Moore
2019-09-19  1:22 ` [PATCH ghak90 V7 19/21] audit: check cont depth Richard Guy Briggs
2019-09-19  1:22 ` [PATCH ghak90 V7 20/21] audit: add capcontid to set contid outside init_user_ns Richard Guy Briggs
2019-10-19  1:39   ` Richard Guy Briggs
2019-10-21 19:53     ` Paul Moore
2019-10-21 21:38       ` Richard Guy Briggs
2019-10-21 21:43         ` Paul Moore
2019-10-21 23:57           ` Richard Guy Briggs
2019-10-22  0:31             ` Paul Moore
2019-10-22 12:13               ` Neil Horman
2019-10-22 14:04                 ` Paul Moore
2019-10-22 20:06                 ` Richard Guy Briggs
2019-10-22 14:27               ` Richard Guy Briggs
2019-10-22 14:34                 ` Paul Moore
2019-10-24 21:00               ` Richard Guy Briggs
2019-10-30 20:27                 ` Paul Moore
2019-10-30 22:03                   ` Richard Guy Briggs
2019-10-31 13:59                     ` Paul Moore
2019-10-31 14:50                     ` Steve Grubb
2019-10-31 23:37                       ` Paul Moore
2019-11-01  1:02                       ` Duncan Roe
2019-11-01 15:09                       ` Richard Guy Briggs
2019-11-01 15:13                         ` Steve Grubb
2019-11-01 15:21                           ` Richard Guy Briggs
2019-11-01 16:22                         ` Paul Moore
2019-09-19  1:22 ` [PATCH ghak90 V7 21/21] audit: add proc interface for capcontid Richard Guy Briggs

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