feat(profiles): new children group.

This group is reserved for profile  without an attachment path because
it is ended to be used only via "Px -> <profile-name>".

apparmor.d/groups/children/child-pager

@@ -0,0 +1,38 @@
+# apparmor.d - Full set of apparmor profiles
+# Copyright (C) 2020-2022 Mikhail Morfikov
+# Copyright (C) 2021-2022 Alexandre Pujol <alexandre@pujol.io>
+# SPDX-License-Identifier: GPL-2.0-only
+
+# Note: This profile does not specify an attachment path because it is
+# intended to be used only via "Px -> child-pager" exec transitions from
+# other profiles. We want to confine the pager(1) utility when it
+# is invoked from other confined applications, but not when it is used
+# in regular (unconfined) shell scripts or run directly by the user.
+
+abi <abi/3.0>,
+
+include <tunables/global>
+
+# Do not attach to /{usr/,}bin/pager by default
+profile child-pager {
+  include <abstractions/base>
+  include <abstractions/consoles>
+
+  capability dac_override,
+  capability dac_read_search,
+
+  signal (receive) set=(stop, cont, term, kill),
+
+  /{usr/,}bin/       r,
+  /{usr/,}bin/pager mr,
+  /{usr/,}bin/less  mr,
+  /{usr/,}bin/more  mr,
+
+  @{system_share_dirs}/terminfo/{,**} r,
+
+  owner @{HOME}/ r,
+  owner @{HOME}/.lesshs* rw,
+  owner @{user_cache_dirs}/lesshs* rw,
+
+  include if exists <local/child-pager>
+}