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audit: always check the netlink payload length in audit_receive_msg()

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[ Upstream commit 7561252892 ]

This patch ensures that we always check the netlink payload length
in audit_receive_msg() before we take any action on the payload
itself.

Cc: stable@vger.kernel.org
Reported-by: syzbot+399c44bf1f43b8747403@syzkaller.appspotmail.com
Reported-by: syzbot+e4b12d8d202701f08b6d@syzkaller.appspotmail.com
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Paul Moore
2020-02-24 16:38:57 -05:00
committed by Greg Kroah-Hartman
parent 469020eb5b
commit 9d2fdc4c7e
1 changed files with 21 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
kernel/audit.c
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@@ -1106,13 +1106,11 @@ static void audit_log_feature_change(int which, u32 old_feature, u32 new_feature
audit_log_end(ab);
}
static int audit_set_feature(struct sk_buff *skb)
static int audit_set_feature(struct audit_features *uaf)
{
struct audit_features *uaf;
int i;
BUILD_BUG_ON(AUDIT_LAST_FEATURE + 1 > ARRAY_SIZE(audit_feature_names));
uaf = nlmsg_data(nlmsg_hdr(skb));
/* if there is ever a version 2 we should handle that here */
@@ -1180,6 +1178,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
{
u32 seq;
void *data;
int data_len;
int err;
struct audit_buffer *ab;
u16 msg_type = nlh->nlmsg_type;
@@ -1193,6 +1192,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
seq = nlh->nlmsg_seq;
data = nlmsg_data(nlh);
data_len = nlmsg_len(nlh);
switch (msg_type) {
case AUDIT_GET: {
@@ -1216,7 +1216,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
struct audit_status s;
memset(&s, 0, sizeof(s));
/* guard against past and future API changes */
memcpy(&s, data, min_t(size_t, sizeof(s), nlmsg_len(nlh)));
memcpy(&s, data, min_t(size_t, sizeof(s), data_len));
if (s.mask & AUDIT_STATUS_ENABLED) {
err = audit_set_enabled(s.enabled);
if (err < 0)
@@ -1320,7 +1320,9 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
return err;
break;
case AUDIT_SET_FEATURE:
err = audit_set_feature(skb);
if (data_len < sizeof(struct audit_features))
return -EINVAL;
err = audit_set_feature(data);
if (err)
return err;
break;
@@ -1332,6 +1334,8 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
err = audit_filter(msg_type, AUDIT_FILTER_USER);
if (err == 1) { /* match or error */
char *str = data;
err = 0;
if (msg_type == AUDIT_USER_TTY) {
err = tty_audit_push();
@@ -1339,26 +1343,24 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
break;
}
audit_log_common_recv_msg(&ab, msg_type);
if (msg_type != AUDIT_USER_TTY)
if (msg_type != AUDIT_USER_TTY) {
/* ensure NULL termination */
str[data_len - 1] = '\0';
audit_log_format(ab, " msg='%.*s'",
AUDIT_MESSAGE_TEXT_MAX,
(char *)data);
else {
int size;
str);
} else {
audit_log_format(ab, " data=");
size = nlmsg_len(nlh);
if (size > 0 &&
((unsigned char *)data)[size - 1] == '\0')
size--;
audit_log_n_untrustedstring(ab, data, size);
if (data_len > 0 && str[data_len - 1] == '\0')
data_len--;
audit_log_n_untrustedstring(ab, str, data_len);
}
audit_log_end(ab);
}
break;
case AUDIT_ADD_RULE:
case AUDIT_DEL_RULE:
if (nlmsg_len(nlh) < sizeof(struct audit_rule_data))
if (data_len < sizeof(struct audit_rule_data))
return -EINVAL;
if (audit_enabled == AUDIT_LOCKED) {
audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
@@ -1366,7 +1368,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
audit_log_end(ab);
return -EPERM;
}
err = audit_rule_change(msg_type, seq, data, nlmsg_len(nlh));
err = audit_rule_change(msg_type, seq, data, data_len);
break;
case AUDIT_LIST_RULES:
err = audit_list_rules_send(skb, seq);
@@ -1380,7 +1382,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
case AUDIT_MAKE_EQUIV: {
void *bufp = data;
u32 sizes[2];
size_t msglen = nlmsg_len(nlh);
size_t msglen = data_len;
char *old, *new;
err = -EINVAL;
@@ -1456,7 +1458,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
memset(&s, 0, sizeof(s));
/* guard against past and future API changes */
memcpy(&s, data, min_t(size_t, sizeof(s), nlmsg_len(nlh)));
memcpy(&s, data, min_t(size_t, sizeof(s), data_len));
/* check if new data is valid */
if ((s.enabled != 0 && s.enabled != 1) ||
(s.log_passwd != 0 && s.log_passwd != 1))