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Moderator
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sep driver permissions

I have a customer who set up permissions on the driver 600.  Obviously this is wrong since a non-root user in the vtune group will not have permissions.

I advised to insmod with permission  660 to restrict use to those in the vtune group.  Fine.  Now their question is - does the group perms NEED WRITE permission?  Shouldn't the perms be 640 - in other words, why does a user need write permission?

 

Ron

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Highlighted
Employee
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If you use default permission, that is "666", but at least you need to use "660" for non-root user, otherwise - the driver has no write permission to create file

# ./insmod-sep3 -p 640

Checking for PMU arbitration service (PAX) ... detected.
PAX service is accessible to all users.
Executing: insmod ./sep3_15-x32_64-2.6.32-71.el6.x86_64smp.ko
Creating /dev/sep3_15 base devices with major number 247 ... done.
Creating /dev/sep3_15 percpu devices with major number 246 ... done.
Setting group ownership of devices to group "vtune" ... done.
Setting file permissions on devices to "640" ... done.
The sep3_15 driver has been successfully loaded.
Checking for vtsspp driver ... not detected.
Executing: insmod ./vtsspp/vtsspp-x32_64-2.6.32-71.el6.x86_64smp.ko gid=511 mode=0640
The vtsspp driver has been successfully loaded.

# su peter
$ amplxe-cl -c advanced-hotspots -r /tmp/r003ah -d 5
amplxe: Collection started. To stop the collection, either press CTRL-C or enter from another console window: amplxe-cl -r /tmp/r003ah -command stop.
amplxe: Warning: To enable hardware event-base sampling, VTune Amplifier has disabled the NMI watchdog timer. The watchdog timer will be re-enabled after collection completes.
Problem accessing the sampling driver.  The driver may need to be     (re)installed with appropriate group/file permissions
amplxe: Error: Error: Cannot create output file -- The file directory does not exist,  or the directory is not writable
ERROR: Options error

amplxe: Collection failed.
amplxe: Internal Error

 

 

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Highlighted
Moderator
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ah I see.  yes, of course.  Thanks for the explanation, that makes perfect sense.

ron

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