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_init_ns() for PPIDs to anchor all audit filters in the
init_pid_ns.
(informed by ebiederman's 6c621b7e)
Cc: sta...@vger.kernel.org
Cc: Eric W. Biederman <ebied...@xmission.com>
Signed-off-by: Richard Guy Briggs <r...@redhat.com>
---
kernel/audit.c | 4 ++--
kernel/auditsc.c | 2 +-
security/apparmor/audit.c | 5 +----
3 files changed, 4 insertions(+), 7 deletions(-)
diff --git a/kernel/audit.c b/kernel/audit.c
index 2476334..75b0989 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1588,10 +1588,10 @@ 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_init_ns(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 8c644c5..74a0748 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -466,7 +466,7 @@ 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_init_ns(current);
result = audit_comparator(ctx->ppid, f->op,
f->val);
}
break;
diff --git a/security/apparmor/audit.c b/security/apparmor/audit.c
index 031d2d9..497b306 100644
--- a/security/apparmor/audit.c
+++ b/security/apparmor/audit.c
@@ -132,10 +132,7 @@ static void audit_pre(struct audit_buffer *ab, void *ca)
if (sa->aad->profile) {
struct aa_profile *profile = sa->aad->profile;
- pid_t pid;
- rcu_read_lock();
- pid = rcu_dereference(tsk->real_parent)->pid;
- rcu_read_unlock();
+ pid_t pid = task_ppid_nr_init_ns(tsk);
audit_log_format(ab, " parent=%d", pid);
if (profile->ns != root_ns) {
audit_log_format(ab, " namespace=");
--
1.7.1
--
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