Nice. I'm currently away from my computer, but I'll have a look ASAP. Thanks!
-Mark On Fri, Jul 30, 2021, 06:41 Oliver Maurhart <1935...@bugs.launchpad.net> wrote: > Add-on: I checked the sources provided at > https://download.virtualbox.org/virtualbox/6.1.22/ and I think the > responsible code snippet is in > VirtualBox-6.1.22/src/VBox/HostDrivers/Support/SUPR3HardenedMain.cpp > > ``` > $ cat -n > VirtualBox-6.1.22/src/VBox/HostDrivers/Support/SUPR3HardenedMain.cpp | grep > -A 10 2550 > 2550 /* > 2551 * Check that we're root, if we aren't then the installation > is butchered. > 2552 */ > 2553 g_uid = getuid(); > 2554 g_gid = getgid(); > 2555 if (geteuid() != 0 /* root */) > 2556 supR3HardenedFatalMsg("SUPR3HardenedMain", > kSupInitOp_RootCheck, VERR_PERMISSION_DENIED, > 2557 "Effective UID is not root (euid=%d > egid=%d uid=%d gid=%d)", > 2558 geteuid(), getegid(), g_uid, g_gid); > 2559 #endif /* SUP_HARDENED_SUID */ > 2560 > ``` > > When making a small demo: > ``` > $ cat a.c > #include <stdio.h> > #include <fcntl.h> > > #include <unistd.h> > #include <sys/types.h> > > int main(int argc, char** argv) { > > printf("Real user id: %d\n", getuid()); > printf("Effective user id: %d\n", geteuid()); > > int res = openat(AT_FDCWD, "/dev/vboxnetctl", O_RDWR); > > if (res == -1) { > perror(NULL); > return 1; > } > printf("Opened file.\n"); > return 0; > } > ``` > with > > ``` > $ gcc a.c > $ sudo chown root: a.out > $ ls -l a.out > -rwxrwxr-x 1 root root 16312 Jul 30 12:05 a.out > > $ ./a.out > Real user id: 1000 > Effective user id: 1000 > Operation not permitted > > $ sudo ./a.out > Real user id: 0 > Effective user id: 0 > Opened file. > > $ sudo chmod u+s a.out > $ ./a.out > Real user id: 1000 > Effective user id: 0 > Opened file. > ``` > > However, regardless if I provide each and every executable in > /usr/lib/virtualbox/* the sticky bit with `chmod u+s` this error keeps > popping up. > > X11 showing the error dialog refers to /usr/lib/virtualbox/VBoxManage. > But it seems very resilient to any of my attempts. > > BUT: running VBoxManage as root (e.g. `sudo VirtualBox`) works like > charm. > > -- > You received this bug notification because you are subscribed to the bug > report. > https://bugs.launchpad.net/bugs/1935856 > > Title: > Virtualbox encounters 'Effective UID is not root' when starting a VM > > To manage notifications about this bug go to: > > https://bugs.launchpad.net/ubuntu/+source/virtualbox/+bug/1935856/+subscriptions > > -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1935856 Title: Virtualbox encounters 'Effective UID is not root' when starting a VM To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/virtualbox/+bug/1935856/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
