[vbox-dev] (no subject)

Frank Mehnert frank.mehnert at oracle.com
Wed Jan 27 07:56:31 UTC 2016


Hi Austin,

On Wednesday 27 January 2016 00:13:18 Austin English wrote:
> Well, Virtualbox hadn't compiled, I was hitting
> https://www.virtualbox.org/ticket/1499.
> 
> Using a 32-bit kernel instead, I was able to get VirtualBox 4.3.32 to
> build. The results:
> 
> # hardened, no sudo
> amnesia at amnesia:/media/amnesia/e3f702b9-64b4-40c2-96c3-ef6cf856e129/VirtualB
> ox-4.3.32/out/linux.x86/release/bin$ ./VirtualBox
> VirtualBox: Error -10 in SUPR3HardenedMain!
> VirtualBox: Effective UID is not root (euid=1000 egid=1000 uid=1000
> gid=1000)
> 
> VirtualBox: Tip! It may help to reinstall VirtualBox.

that will not work of course. Running a hardened build from the bin
directory is not supported. A hardened build will only run if it's
installed to /opt/VirtualBox and the stubs (VirtualBox, VBoxHeadless,
VBoxSDL, VBoxNetDHCP, VBoxNetNAT) are installed as suid root.

> # hardened, as sudo:
> amnesia at amnesia:/media/amnesia/e3f702b9-64b4-40c2-96c3-ef6cf856e129/VirtualB
> ox-4.3.32/out/linux.x86/release/bin$ sudo ./VirtualBox
> [sudo] password for amnesia:
> VirtualBox: supR3HardenedVerifyDir: Failed to open "/opt/VirtualBox":
> No such file or directory (2)

See above, wrong directory.

> # non-hardened, no sudo:
> Dialog Box: Kernel driver not accessible
> 
> Failed to open a session for the virtual machine asdf.
> 
> The virtual machine 'asdf' has terminated unexpectedly during startup
> with exit code 1 (0x1).
> 
> Result Code: NS_ERROR_FAILURE (0x80004005)
> Component: Machine
> Interface: IMachine {480cf695-2d8d-4256-9c7c-cce4184fa048}

This would work if you would adapt the permissions of the /dev/vboxdrv
device to be readable+writable as normal user. This can be done using
a proper udev rule.

> # non-hardened, sudo:
> starts up
> 
> 
> tl;dr: only works with hardening disabled, as root.

Kind regards,

Frank

> On Thu, Jan 21, 2016 at 5:29 PM, Alexey Eromenko <al4321 at gmail.com> wrote:
> > find /vbox-src/ grep VirtualBox
> > $ cd [PATH]
> > $ ./VirtualBox
> > 
> > On Fri, Jan 22, 2016 at 1:21 AM, Austin English <austinenglish at gmail.com>
> > 
> > wrote:
> >> How can Virtualbox be started from compile directory? There were a few
> >> errors, so I'm not sure that it's usable.
> >> 
> >> On Thu, Jan 21, 2016 at 5:19 PM, Alexey Eromenko <al4321 at gmail.com> 
wrote:
> >> > VBox compiled, and even test units ran fine.
> >> > 
> >> > But I see a linker error in last stage:
> >> > kBuild: Linking VMMR0
> >> > ...
> >> > kmk: Target `all' not remade because of errors.
> >> > 
> >> > But no idea what is this error.
> >> > Check if kernel module compiled and works.
> >> > Try to load it
> >> 
> >> --
> >> -Austin
> > 
> > --
> > -Alexey Eromenko "Technologov"

-- 
Dr.-Ing. Frank Mehnert | Software Development Director, VirtualBox
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