Apparmor/upstream release notes

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The upstream version does not match previous versions of AppArmor as some changes were required to get AppArmor upstream. This page covers notes on using the upstream version for each kernel release.

2.6.36 - 2.6.39

The upstream version is missing network mediation and some of the interfaces for introspection. This means:

  • 2.6.36-2.6.39 AppArmor does not mediate network accesses
  • There is a set of compatibility patches that can be applied on top of 2.6.36-.39 kernels to reintroduce networking and introspection interfaces (see below for more info on patching the kernel), so that AppArmor can be used with out the following limitations.
  • To be able to load policy to this version of AppArmor you will need at least version 2.6 of the tools.
    • an updated apparmor_parser is needed to be able to generate and load policy as /sys/kernel/security/apparmor/matching and /sys/kernel/security/apparmor/features were used to generate the correct policy for the current kernel.
    • If you are compiling policy with an alternate kernel loaded you may need to pass a match (-m flag) string to the compiler so that it can generate policy that will load.
    • Policy generated for the upsteam kernels should generally load on non upstream kernels as network rules are not required to be in the compiled policy.
    • Policy generated for a non the none upstream kernels with the compatibility patches applied will not work on the current upstream kernels unless a match flags is passed to the compiler. So that the generated policy does not contain network rules.
  • the introspection interfaces that are missing are:
    • /sys/kernel/security/apparmor/features
    • /sys/kernel/security/apparmor/matching
    • /sys/kernel/security/apparmor/profiles
    • The REMOVE and RESTART portions of the initscripts are broken. They used /sys/kernel/security/apparmor/profiles to determine what profiles were currently loaded.
      • REMOVE can be simulated by using either of the following but they will not remove profiles that are not currently in the profiles directory
        • apparmor_parser -R /etc/apparmor.d/?*.* # simple assumes all profiles in the profile directory have an embedded .
        •  ?????
      • REPLACE can be simulated by using either of the following but this will not remove any profile that has been deleted from the profile directory.
        • apparmor_parser -r /etc/apparmor.d/?*.* # simple assumes all profiles in the profile directory have an embedded .
        •  ????
    • aa-status will not work as it uses /sys/kernel/security/apparmor/profiles
  • /proc/<pid>/attr/* interfaces are supported so ps -Z based introspection will work.

Patching 2.6.36 - 2.6.39

The above limitations can be avoided by patching the kernel, the patches can be found

The specific instructions for patching and building a kernel will depend on the distro being used. The following instructions apply for kernels obtained from kernel.org

  tar -xjvf linux-2.6.XX.XX.tar.bz2
    • or Obtain git kernel by
  git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
  • patch the kernel
    •  ??
  • configure the kernel
    • make defconfig
    • make menuconfig
      • select ???
  • build the kernel
    • in the base directory of the kernel tree do
 make
    • Install the kernel
 make install
 make modules_install
 depmod -a
  • Build initrmafs if needed (this is very distro dependant)
    • For ubuntu
 sudo update-initramfs -ck <kernelversion>
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