1 files changed, 55 insertions, 0 deletions
diff --git a/meta-app-framework/recipes-connectivity/bluez5/bluez5_appfw.inc b/meta-app-framework/recipes-connectivity/bluez5/bluez5_appfw.inc
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index 000000000..21529e96b
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+++ b/meta-app-framework/recipes-connectivity/bluez5/bluez5_appfw.inc
@@ -0,0 +1,55 @@
+# Recent bluez5 releases started limiting the capabilities of
+# bluetoothd. When running on a Smack-enabled system, that change has the
+# effect that bluetoothd can no longer create the input device under
+# /sys because bluez5 running with label "System" has no write
+# access to that.
+#
+# It works when running as normal root with unrestricted capabilities
+# because then CAP_MAC_OVERRIDE (a Smack-specific capability) allows
+# the process to ignore Smack rules.
+#
+# We need to ensure that bluetoothd still has that capability.
+#
+# To fix the issue, Patick and Casey(the Smack architect) had a talk
+# about it in Ostro dev mail list. Casey has some ideas about the issue:
+# "Turning off privilege is a great thing to do *so long as you don't
+# really need the privilege*. In this case you really need it.
+# The application package isn't written to account for Smack's use of
+# CAP_MAC_OVERRIDE as the mechanism for controlling this dangerous operation.
+# Yes, it would be possible to change /proc to change the Smack label on
+# that particular file, but that might open other paths for exploit.
+# I say give the program the required capability. The program maintainer
+# may well say change the kernel handling of /proc. You're stuck in the
+# middle, as both work the way they're intended and hence the system
+# doesn't work. :( There isn't a way to make this work without "loosening"
+# something."
+# Therefore, when we we run the program with CAP_MAC_OVERRIDE,
+# the whole reason for having capabilities is so the we can give a
+# process the ability to bypass one kind of check without giving it the
+# ability to bypass other, unrelated checks. A process with
+# CAP_MAC_OVERRIDE is still constrained by the file mode bits.
+# We was overly worried about granting that capability.
+# When it has no other effect than excluding a process from Smack MAC enforcement,
+# then adding to the process seems like the right solution for now.
+#
+# The conclusion from Patick and Casey is that the Smack architect give the key point
+# that this is the solution preferred.
+#
+# Because the solution is to some extend specific to the environment
+# in which connmand runs, this change is not submitted upstream
+# and it can be overridden by a distro via FIX_BLUEZ5_CAPABILITIES.
+#
+# The related patch has been submitted to upstream too.
+# upstream link: http://permalink.gmane.org/gmane.linux.bluez.kernel/67993
+
+FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
+
+SRC_URI_append_with-lsm-smack = "\
+  file://bluetooth.service.conf \
+"
+
+FILES_${PN}_append = " ${systemd_unitdir}"
+
+do_install_append_with-lsm-smack() {
+  install -Dm0644 ${WORKDIR}/bluetooth.service.conf ${D}${systemd_unitdir}/system/bluetooth.service.d/smack.conf
+}