[Bug 1039887] Re: fstab does not honor /proc mount options

[Christian Kujau]

On Sat, 5 Jul 2014 at 17:18, KDEUSER56 wrote:
> So, how do I pass mount options to /proc instead? I need to enable acl
> support for /proc for security reasons.

I don't think procfs supports ACLs:

$ sudo mount -o remount,acl -v /proc
mount: mount failed
proc: unrecognized mount option "acl" or missing value

As a workaround, use /etc/rc.local to remount /proc with specific mount 
options until this bug is fixed.

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https://bugs.launchpad.net/bugs/1039887

Title:
  fstab does not honor /proc mount options

Status in “mountall” package in Ubuntu:
  Triaged

Bug description:
  Passing mount options (here: "hidepid=2") for /proc via /etc/fstab
  does not seem to work:

  $ grep /proc /etc/fstab /etc/mtab /proc/mounts 
  /etc/fstab:proc                   /proc proc  nodev,noexec,nosuid,hidepid=2 0  0
  /etc/mtab:proc                   /proc proc  rw,noexec,nosuid,nodev 0 0
  /proc/mounts:proc           /proc proc   rw,nosuid,nodev,noexec,relatime 0 0

  Also, /etc/mtab and /proc/mounts are out of sync - are there plans to
  link /etc/mtab against /proc/mounts? (Note: I'm not particularly in
  favor of bug 906293, propsing yet another file to the mix).

  The system is a fully patched Ubuntu 12.04.1 LTS (i686) in an Amazon
  EC2 virtual machine.

  Workaround: add the following line to /etc/rc.local:

     mount -o remount,hidepid=2 /proc

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