On 2018-02-05 10:37, Hiromasa YOSHIMOTO wrote:
> Dear Andreas,
>
> Thank you for your small program.
> I have no problem with setuid binaries on my system.
>
> I’ve checked also the source code of nvidia-modprobe,
> and modified it to show the error messages. The diff is as follows.
Thanks for checking :-)
> With this modification, nvidia-modprobe -u will output the following message
> when it fails.
> ———-
> modprobe_path: /sbin/modprobe
> module_name: nvidia-uvm
> eeuid() 0
> modprobe: ERROR: could not insert 'nvidia_current_uvm': Operation not
> permitted
the failing command here is (from nvidia.conf)
modprobe -i nvidia-current-uvm
you could make all the commands very verbose in nvidia.conf by using
always
modprobe -vv
can you reproduce the failure with
$ lsmod | grep nvidia
$ sudo modprobe -vv -i nvidia-current-uvm
> modprobe: ERROR: ../libkmod/libkmod-module.c:979 command_do() Error running
> install command for nvidia_uvm
> modprobe: ERROR: could not insert ‘nvidia_uvm': Operation not permitted
and these are the followup-errors from the initial modprobe command done
by nvidia-modprobe
> From this output, I think this issue occurs
> when we have any wrong configuration in /etc/modprobe.d/.
But everything is as it is intended ...
> In my case, /etc/modprobe.d/nvidia.conf has the following lines.
> ———
> install nvidia modprobe -i nvidia-current $CMDLINE_OPTS
> install nvidia-modeset modprobe nvidia ; modprobe -i nvidia-current-modeset
> $CMDLINE_OPTS
> install nvidia-drm modprobe nvidia-current-modeset ; modprobe -i
> nvidia-current-drm $CMDLINE_OPTS
> install nvidia-uvm modprobe nvidia ; modprobe -i nvidia-current-uvm
> $CMDLINE_OPTS
> remove nvidia modprobe -r -i nvidia-drm nvidia-modeset nvidia-uvm nvidia
> ——-
>
> I’m bit confusing between nvidia_uvm and nvidia-uvm. However,
'-' and '_' are treated as equivalent by the kernel.
(probably because the module names need to be mapped to valid C
identifiers and '-' is not valid there, but in filenames)
> adding a line below, nvidia-modprobe -u now works fine as expected.
> ———
> alias nvidia-uvm nvidia-current-uvm
> ——-
aliases add extreme madness to the renamed nvidia module madness :-)
the alias probably breaks
modprobe -r nvidia-uvm
because there is no nvidia-current-uvm module loaded that could be unloaded
Andreas
