On Mon, Apr 13, 2015 at 10:55:58AM -0000, Gilad Broner wrote: > > copy_to/from_user() returns the number of bytes not copied and not an > > error code. Printing these error messages in the ioctl means the user > > can trigger a DoS by filling up /var/log/messages. They make the code > > uglier. We should stop here if the copy fails and goto out_release_mem > > otherwise we might end up returning success by mistake. > > Thanks for the comment, I will update the code. > I wanted to clarify about the possibility of a DoS attack: > - Isn't var/log/messages cyclic or size limited in some way?
Some people limit it some people don't. To be honest, I'm not really concerned about this, but I use it as an excuse to remove debug messages. > - What determines that dev_err() prints go to /var/log/messages? > would it still be the case if dev_dbg() was used instead? Normally dev_dbg() message are not printed. But just remove them. They make the code uglier. regards, dan carpenter -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
