[PATCH] Audit: Ignore terminating NUL in AUDIT_USER_TTY messages

From: Miloslav Trmac <mitr(a)redhat.com&gt; AUDIT_USER_TTY, like all other messages sent from user-space, is sent NUL-terminated. Unlike other user-space audit messages, which come only from trusted sources, AUDIT_USER_TTY messages are processed using audit_log_n_untrustedstring(). This patch modifies AUDIT_USER_TTY handling to ignore the trailing NUL and use the "quoted_string" representation of the message if possible. Signed-Off-By: Miloslav Trmac <mitr(a)redhat.com&gt; --- AUDIT_USER_TTY will commonly contain spaces, but not always. This patch cleans the AUDIT_USER_TTY messages up a bit. kernel/audit.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/audit.c b/kernel/audit.c index ccb8d68..f3d88c4 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -763,6 +763,9 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) audit_log_format(ab, " msg="); size = nlmsg_len(nlh); + if (size > 0 && + ((unsigned char *)data)[size - 1] == '\0') + size--; audit_log_n_untrustedstring(ab, data, size); } audit_set_pid(ab, pid);