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: stable@xxxxxxxxxxxxxxx
Cc: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Richard Guy Briggs <rgb@xxxxxxxxxx>
---
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 34c5a23..f5ea718 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1818,10 +1818,10 @@ 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 tty=%s ses=%u",
- 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 0c3bf79..b909715 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -461,7 +461,7 @@ 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;
--
1.7.1
--
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