[Bug 217649] cam_open_device is potentially broken; errors with pass(4) from cam_real_open_device helper function

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217649

            Bug ID: 217649
           Summary: cam_open_device is potentially broken; errors with
                    pass(4) from cam_real_open_device helper function
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ngie at FreeBSD.org

Repro:

- Log in as root (or a user with sudo/su privileges or write access to devices)
- Copy this directory to your FreeBSD machine:
https://people.freebsd.org/~ngie/bugs/cam_open_device/
- cd to the downloaded path and run "make" (don't call "make obj" first).
- Run "./cam_open_device /some/cam/device/path", e.g. "./cam_open_device
/dev/da0".

Expected results:
- If passthrough support is enabled, it should open the device, but not do
anything with it.

Actual results:

I get the following error message from the program when running it against my
fake mpt(4) controller in my VMware fusion instance:

# ls -l /dev/pass*
crw-------  1 root  operator  0x36 Mar  6 20:03 /dev/pass0
crw-------  1 root  operator  0x37 Mar  6 20:03 /dev/pass1
# ./cam_open_device da0
cam_open_device: cam_open_device failed: Operation not permitted
cam_open_device: cam_errbuf is: cam_real_open_device: couldn't open passthrough
device /dev/pass0
cam_real_open_device: Operation not permitted
#

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