New answers tagged permissions
On Linux kernel 3.3, this is done with the hidepid= and gid= mount options for /proc (to be added in /etc/fstab). See this answer. Possibly, some distributions which use older kernels may have backported the patch. On FreeBSD there is a sysctl flag for that, called security.bsd.see_other_uids. See this documentation (search for "see_other_uids"). I am not ...
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