On 19.09.2007 09:09, Alexander Larsson wrote: > On Tue, 2007-09-18 at 19:41 +0200, Thorsten Leemhuis wrote: >> Thus I'm not even able to read from it: >> >> $ dd if=/dev/sda3 bs=512K count=1 | strings >> dd: opening `/dev/sda3': Permission denied >> >> Life sucks, but that's how things are supposed to be in linux/unix land >> as far as I know. But well, for fuse there seem to exist different rules: >> >> $ mkdir ntfs >> $ /sbin/mount.ntfs-3g /dev/sda3 ntfs/ >> $ touch ntfs/foo >> $ ls -l ntfs/foo >> -rwxrwxrwx 1 thl thl 0 18. Sep 19:27 ntfs/foo >> >> Which brings me to my questions: Can somebody please explain why the >> above it working? Does it mean that if I write my own malicious >> fuse.ext3 userspace driver that I can mount each and every block-device >> on my system and read or modify the files on it (all by using fuse)? >> What if there is a small error in mount.ntfs-3g somewhere -- could it be >> abused to destroy a partition on my system while being a ordinary user? > > Thats quite weird. [...] Agreed. But I got the impression that how some users expect it to work. > Is /sbin/mount.ntfs-3g setuid perhaps? Yes: $ ls -l /sbin/mount.ntfs-3g -rwsr-xr-- 1 root fuse 40528 26. Aug 16:50 /sbin/mount.ntfs-3g CU knurd -- Fedora-desktop-list mailing list Fedora-desktop-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-desktop-list
