Hi! > > The only really weird case Alan spotted is device nodes, where the > > actual device registered to a major/minor pair changes over time, > > possibly allowing a re-open to access a device it otherwise was not > > meant to. BTW if the device number reuse happens really quickly, this > > could even be a race for a plain open. Real solution might actually > > be in udev: when deregistering a device, change mode bits to all-zero > > before removing the device node. > > Devices nodes specifically were the case I was thinking of. > > Changing the mode bits to all-zero at the final unlink would be a lot > more reliable and certain in the kernel. Does it really close the race completely? udev sets 660 open does permission checks device disappears chmod 000 new device appears udev chmods 600 open returns new device ? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
