[PATCH ghak59 V4] audit: add syscall information to CONFIG_CHANGE records
From: Richard Guy Briggs
Date: Fri Jan 18 2019 - 17:43:25 EST
Tie syscall information to all CONFIG_CHANGE calls since they are all a
result of user actions.
Exclude user records from syscall context:
Since the function audit_log_common_recv_msg() is shared by a number of
AUDIT_CONFIG_CHANGE and the entire range of AUDIT_USER_* record types,
and since the AUDIT_CONFIG_CHANGE message type has been converted to a
syscall accompanied record type, special-case the AUDIT_USER_* range of
messages so they remain standalone records.
See: https://github.com/linux-audit/audit-kernel/issues/59
See: https://github.com/linux-audit/audit-kernel/issues/50
Signed-off-by: Richard Guy Briggs <rgb@xxxxxxxxxx>
---
Changelog:
v4:
- rebase on v5.0-rc1
- remove audit_log_config_change_alt() and call
audit_log_common_recv_msg() directly
- remove audit_tree_log_remove_rule() change superceded by patch v3-3/4
Passes audit-testsuite, no issues identified with ausearch-test.
kernel/audit.c | 27 ++++++++++++++++++---------
kernel/audit_fsnotify.c | 2 +-
kernel/audit_watch.c | 2 +-
kernel/auditfilter.c | 2 +-
4 files changed, 21 insertions(+), 12 deletions(-)
diff --git a/kernel/audit.c b/kernel/audit.c
index d412fb4ae6d5..ca55ccb46b76 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -396,7 +396,7 @@ static int audit_log_config_change(char *function_name, u32 new, u32 old,
struct audit_buffer *ab;
int rc = 0;
- ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
+ ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_CONFIG_CHANGE);
if (unlikely(!ab))
return rc;
audit_log_format(ab, "op=set %s=%u old=%u ", function_name, new, old);
@@ -1053,7 +1053,8 @@ static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
return err;
}
-static void audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type)
+static void audit_log_common_recv_msg(struct audit_context *context,
+ struct audit_buffer **ab, u16 msg_type)
{
uid_t uid = from_kuid(&init_user_ns, current_uid());
pid_t pid = task_tgid_nr(current);
@@ -1063,7 +1064,7 @@ static void audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type)
return;
}
- *ab = audit_log_start(NULL, GFP_KERNEL, msg_type);
+ *ab = audit_log_start(context, GFP_KERNEL, msg_type);
if (unlikely(!*ab))
return;
audit_log_format(*ab, "pid=%d uid=%u ", pid, uid);
@@ -1071,6 +1072,11 @@ static void audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type)
audit_log_task_context(*ab);
}
+static inline void audit_log_user_recv_msg(struct audit_buffer **ab, u16 msg_type)
+{
+ audit_log_common_recv_msg(NULL, ab, msg_type);
+}
+
int is_audit_feature_set(int i)
{
return af.features & AUDIT_FEATURE_TO_MASK(i);
@@ -1338,7 +1344,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
if (err)
break;
}
- audit_log_common_recv_msg(&ab, msg_type);
+ audit_log_user_recv_msg(&ab, msg_type);
if (msg_type != AUDIT_USER_TTY)
audit_log_format(ab, " msg='%.*s'",
AUDIT_MESSAGE_TEXT_MAX,
@@ -1361,7 +1367,8 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
if (nlmsg_len(nlh) < sizeof(struct audit_rule_data))
return -EINVAL;
if (audit_enabled == AUDIT_LOCKED) {
- audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
+ audit_log_common_recv_msg(audit_context(), &ab,
+ AUDIT_CONFIG_CHANGE);
audit_log_format(ab, " op=%s audit_enabled=%d res=0",
msg_type == AUDIT_ADD_RULE ?
"add_rule" : "remove_rule",
@@ -1376,7 +1383,8 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
break;
case AUDIT_TRIM:
audit_trim_trees();
- audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
+ audit_log_common_recv_msg(audit_context(), &ab,
+ AUDIT_CONFIG_CHANGE);
audit_log_format(ab, " op=trim res=1");
audit_log_end(ab);
break;
@@ -1406,8 +1414,8 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
/* OK, here comes... */
err = audit_tag_tree(old, new);
- audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
-
+ audit_log_common_recv_msg(audit_context(), &ab,
+ AUDIT_CONFIG_CHANGE);
audit_log_format(ab, " op=make_equiv old=");
audit_log_untrustedstring(ab, old);
audit_log_format(ab, " new=");
@@ -1474,7 +1482,8 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
old.enabled = t & AUDIT_TTY_ENABLE;
old.log_passwd = !!(t & AUDIT_TTY_LOG_PASSWD);
- audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
+ audit_log_common_recv_msg(audit_context(), &ab,
+ AUDIT_CONFIG_CHANGE);
audit_log_format(ab, " op=tty_set old-enabled=%d new-enabled=%d"
" old-log_passwd=%d new-log_passwd=%d res=%d",
old.enabled, s.enabled, old.log_passwd,
diff --git a/kernel/audit_fsnotify.c b/kernel/audit_fsnotify.c
index cf4512a33675..37ae95cfb7f4 100644
--- a/kernel/audit_fsnotify.c
+++ b/kernel/audit_fsnotify.c
@@ -127,7 +127,7 @@ static void audit_mark_log_rule_change(struct audit_fsnotify_mark *audit_mark, c
if (!audit_enabled)
return;
- ab = audit_log_start(NULL, GFP_NOFS, AUDIT_CONFIG_CHANGE);
+ ab = audit_log_start(audit_context(), GFP_NOFS, AUDIT_CONFIG_CHANGE);
if (unlikely(!ab))
return;
audit_log_session_info(ab);
diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c
index 20ef9ba134b0..e8d1adeb2223 100644
--- a/kernel/audit_watch.c
+++ b/kernel/audit_watch.c
@@ -242,7 +242,7 @@ static void audit_watch_log_rule_change(struct audit_krule *r, struct audit_watc
if (!audit_enabled)
return;
- ab = audit_log_start(NULL, GFP_NOFS, AUDIT_CONFIG_CHANGE);
+ ab = audit_log_start(audit_context(), GFP_NOFS, AUDIT_CONFIG_CHANGE);
if (!ab)
return;
audit_log_session_info(ab);
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index bf309f2592c4..26a80a9d43a9 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -1091,7 +1091,7 @@ static void audit_log_rule_change(char *action, struct audit_krule *rule, int re
if (!audit_enabled)
return;
- ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
+ ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_CONFIG_CHANGE);
if (!ab)
return;
audit_log_session_info(ab);
--
1.8.3.1