On Mon 2009-10-26 14:22:16, Trond Myklebust wrote: > On Sun, 2009-10-25 at 10:36 +0100, Pavel Machek wrote: > > Well, it is unexpected and mild security hole. > > > > Part of the problem is that even if you have read-only > > filedescriptor, you can upgrade it to read-write, even if path is > > inaccessible to you. > > > > So if someone passes you read-only filedescriptor, you can still write > > to it. > > If someone passes you a file descriptor, can't you in any case play > games with, openat(fd,"",O_RDWR), in order to achieve the same thing? I > must admit I haven't tried it yet, but at a first glance I can't see > anything that prevents me from doing this... According to my documentation, openat needs directory fd. 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
