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Message-Id: <995b77557010b2f9aed0e10435f7b8536df7a5db.1521179281.git.rgb@redhat.com>
Date: Fri, 16 Mar 2018 05:00:29 -0400
From: Richard Guy Briggs <rgb@...hat.com>
To: cgroups@...r.kernel.org, containers@...ts.linux-foundation.org,
linux-api@...r.kernel.org,
Linux-Audit Mailing List <linux-audit@...hat.com>,
linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
netdev@...r.kernel.org
Cc: luto@...nel.org, jlayton@...hat.com, carlos@...hat.com,
viro@...iv.linux.org.uk, dhowells@...hat.com, simo@...hat.com,
eparis@...isplace.org, serge@...lyn.com, ebiederm@...ssion.com,
madzcar@...il.com, Richard Guy Briggs <rgb@...hat.com>
Subject: [RFC PATCH ghak32 V2 02/13] audit: check children and threading before allowing containerid
Check if a task has existing children or co-threads and refuse to set
the container ID if either are present. Failure to check this could
permit games where a child scratches its parent's back to work around
inheritance and double-setting policy.
Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
---
kernel/auditsc.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 29c8482..a6b0a52 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -2087,6 +2087,10 @@ static int audit_set_containerid_perm(struct task_struct *task, u64 containerid)
/* if we don't have caps, reject */
if (!capable(CAP_AUDIT_CONTROL))
return -EPERM;
+ /* if task has children or is not single-threaded, deny */
+ if (!list_empty(&task->children) ||
+ !(thread_group_leader(task) && thread_group_empty(task)))
+ return -EPERM;
/* if containerid is unset, allow */
if (!audit_containerid_set(task))
return 0;
--
1.8.3.1
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