audit: Handle embedded NUL in TTY input auditing

Data read from a TTY can contain an embedded NUL byte (e.g. after
pressing Ctrl-2, or sent to a PTY).  After the previous patch, the data
would be logged only up to the first NUL.

This patch modifies the AUDIT_TTY record to always use the hexadecimal
format, which does not terminate at the first NUL byte.  The vast
majority of recorded TTY input data will contain either ' ' or '\n', so
the hexadecimal format would have been used anyway.

Signed-off-by: Miloslav Trmac <mitr@redhat.com>
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/char/tty_audit.c b/drivers/char/tty_audit.c
index 3582f43..5787249 100644 (file)
--- a/drivers/char/tty_audit.c
+++ b/drivers/char/tty_audit.c
@@ -93,7 +93,7 @@ static void tty_audit_buf_push(struct task_struct *tsk, uid_t loginuid,
                get_task_comm(name, tsk);
                audit_log_untrustedstring(ab, name);
                audit_log_format(ab, " data=");
-               audit_log_n_untrustedstring(ab, buf->data, buf->valid);
+               audit_log_n_hex(ab, buf->data, buf->valid);
                audit_log_end(ab);
        }
        buf->valid = 0;