The HCI code fails to initialize the two padding bytes of struct hci_ufilter before copying it to userland -- that for leaking two bytes kernel stack. Add an explicit memset(0) before filling the structure to avoid the info leak.
Signed-off-by: Mathias Krause <[email protected]> Cc: Marcel Holtmann <[email protected]> Cc: Gustavo Padovan <[email protected]> Cc: Johan Hedberg <[email protected]> --- net/bluetooth/hci_sock.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c index a7f04de..a27bbc3 100644 --- a/net/bluetooth/hci_sock.c +++ b/net/bluetooth/hci_sock.c @@ -1009,6 +1009,7 @@ static int hci_sock_getsockopt(struct socket *sock, int level, int optname, { struct hci_filter *f = &hci_pi(sk)->filter; + memset(&uf, 0, sizeof(uf)); uf.type_mask = f->type_mask; uf.opcode = f->opcode; uf.event_mask[0] = *((u32 *) f->event_mask + 0); -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
