proc perms don't change with file

Issue

• Shouldn't the perms change with the executable?
• Executable with execute only permissions (111) disallows reading process stats from /proc by user that initiated the executable.
• Changes the permissions on the file on disk have no effect, the running binary stays with its original permissions at time of initiation.
• Theory : The permissions are stored in an inode and the running binary and therefore  the reference to it in proc should be references to the on disk inode.
• Assumption : Looks like the kind of thing that might have been done that way to close a security hole.
• Assumption : Copy rather than reference might be done that was to close a subtle security hole.
• Is this a bug?
• Is this an optimization that has some unfortunate side effects?
• Is this something that was done for some non-obvious reason burried within either the VFS or the procfs code?