Not so theoretical race in atkbd_command

[Pavel Machek]

Hi!

There's quite real race in atkbd_command:

static int atkbd_command(struct atkbd *atkbd, unsigned char *param,
int command)
{
        int timeout = 500000; /* 500 msec */
        int send = (command >> 12) & 0xf;
        int receive = (command >> 8) & 0xf;
        int i;

        atkbd->cmdcnt = receive;
[user presses key here]

atkbd_interrupt eats user keypress, thinking its reply. Boom. To
exploit:

while true; do setleds +num; setleds -num; done

then try typing.
							Pavel
-- 
934a471f20d6580d5aad759bf0d97ddc
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/