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audit: check the length of userspace generated audit records 

Commit 7561252892 ("audit: always check the netlink payload length
in audit_receive_msg()") fixed a number of missing message length
checks, but forgot to check the length of userspace generated audit
records.  The good news is that you need CAP_AUDIT_WRITE to submit
userspace audit records, which is generally only given to trusted
processes, so the impact should be limited.

Cc: stable@vger.kernel.org
Fixes: 7561252892 ("audit: always check the netlink payload length in audit_receive_msg()")
Reported-by: syzbot+49e69b4d71a420ceda3e@syzkaller.appspotmail.com
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Paul Moore 2020-04-20 16:24:34 -04:00
parent ae83d0b416
commit 763dafc520
1 changed files with 3 additions and 0 deletions
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3
kernel/audit.c
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@ -1326,6 +1326,9 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2: case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
if (!audit_enabled && msg_type != AUDIT_USER_AVC) if (!audit_enabled && msg_type != AUDIT_USER_AVC)
return 0; return 0;
/* exit early if there isn't at least one character to print */
if (data_len < 2)
return -EINVAL;
err = audit_filter(msg_type, AUDIT_FILTER_USER); err = audit_filter(msg_type, AUDIT_FILTER_USER);
if (err == 1) { /* match or error */ if (err == 1) { /* match or error */