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authorSteve Grubb <sgrubb@redhat.com>2017-10-17 18:29:22 -0400
committerPaul Moore <paul@paul-moore.com>2017-11-10 16:08:36 -0500
commit33e8a907804428109ce1d12301c3365d619cc4df (patch)
tree071112d019bfaa1efc3e668e47af42f6079fc870 /kernel/audit.c
parent6e66ec3cae02952fcfc285cb156c11dcc61f4453 (diff)
downloadlwn-33e8a907804428109ce1d12301c3365d619cc4df.tar.gz
lwn-33e8a907804428109ce1d12301c3365d619cc4df.zip
audit: Allow auditd to set pid to 0 to end auditing
The API to end auditing has historically been for auditd to set the pid to 0. This patch restores that functionality. See: https://github.com/linux-audit/audit-kernel/issues/69 Reviewed-by: Richard Guy Briggs <rgb@redhat.com> Signed-off-by: Steve Grubb <sgrubb@redhat.com> Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'kernel/audit.c')
-rw-r--r--kernel/audit.c29
1 files changed, 16 insertions, 13 deletions
diff --git a/kernel/audit.c b/kernel/audit.c
index 67b3863261d4..64e1d0ec19de 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1197,25 +1197,28 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
pid_t auditd_pid;
struct pid *req_pid = task_tgid(current);
- /* sanity check - PID values must match */
- if (new_pid != pid_vnr(req_pid))
+ /* Sanity check - PID values must match. Setting
+ * pid to 0 is how auditd ends auditing. */
+ if (new_pid && (new_pid != pid_vnr(req_pid)))
return -EINVAL;
/* test the auditd connection */
audit_replace(req_pid);
auditd_pid = auditd_pid_vnr();
- /* only the current auditd can unregister itself */
- if ((!new_pid) && (new_pid != auditd_pid)) {
- audit_log_config_change("audit_pid", new_pid,
- auditd_pid, 0);
- return -EACCES;
- }
- /* replacing a healthy auditd is not allowed */
- if (auditd_pid && new_pid) {
- audit_log_config_change("audit_pid", new_pid,
- auditd_pid, 0);
- return -EEXIST;
+ if (auditd_pid) {
+ /* replacing a healthy auditd is not allowed */
+ if (new_pid) {
+ audit_log_config_change("audit_pid",
+ new_pid, auditd_pid, 0);
+ return -EEXIST;
+ }
+ /* only current auditd can unregister itself */
+ if (pid_vnr(req_pid) != auditd_pid) {
+ audit_log_config_change("audit_pid",
+ new_pid, auditd_pid, 0);
+ return -EACCES;
+ }
}
if (new_pid) {