[3.11.y.z extended stable] Patch "audit: convert PPIDs to the inital PID namespace." has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    audit: convert PPIDs to the inital PID namespace.

to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.11.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.11.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 7640ec6f78f5c8dfacf2eac11f1a5ae2a5c50e96 Mon Sep 17 00:00:00 2001
From: Richard Guy Briggs <rgb at redhat.com>
Date: Tue, 10 Dec 2013 22:10:41 -0500
Subject: audit: convert PPIDs to the inital PID namespace.

commit c92cdeb45eea38515e82187f48c2e4f435fb4e25 upstream.

sys_getppid() returns the parent pid of the current process in its own pid
namespace.  Since audit filters are based in the init pid namespace, a process
could avoid a filter or trigger an unintended one by being in an alternate pid
namespace or log meaningless information.

Switch to task_ppid_nr() for PPIDs to anchor all audit filters in the
init_pid_ns.

(informed by ebiederman's 6c621b7e)
Cc: Eric W. Biederman <ebiederm at xmission.com>
Signed-off-by: Richard Guy Briggs <rgb at redhat.com>
[ luis: backported to 3.11: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 kernel/audit.c   | 4 ++--
 kernel/auditsc.c | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/audit.c b/kernel/audit.c
index 6def25f..aea9a19 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1613,10 +1613,10 @@ void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
 	spin_unlock_irq(&tsk->sighand->siglock);

 	audit_log_format(ab,
-			 " ppid=%ld pid=%d auid=%u uid=%u gid=%u"
+			 " ppid=%d pid=%d auid=%u uid=%u gid=%u"
 			 " euid=%u suid=%u fsuid=%u"
 			 " egid=%u sgid=%u fsgid=%u ses=%u tty=%s",
-			 sys_getppid(),
+			 task_ppid_nr(tsk),
 			 tsk->pid,
 			 from_kuid(&init_user_ns, audit_get_loginuid(tsk)),
 			 from_kuid(&init_user_ns, cred->uid),
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 9845cb3..3b79a47 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -472,7 +472,7 @@ static int audit_filter_rules(struct task_struct *tsk,
 		case AUDIT_PPID:
 			if (ctx) {
 				if (!ctx->ppid)
-					ctx->ppid = sys_getppid();
+					ctx->ppid = task_ppid_nr(tsk);
 				result = audit_comparator(ctx->ppid, f->op, f->val);
 			}
 			break;
--
1.9.1