[PATCH natty] UBUNTU: [Config] packaging: adjust perms on vmlinuz as well

[Kees Cook]

Since kernel symbols are resolvable internally to the kernel, the kernel
itself has a map of the symbols. Continuing the tradition of frustrating
off-the-shelf kernel exploits, make vmlinuz unreadable for non-root, just
like has been done for System.map, etc.

Signed-off-by: Kees Cook <kees.cook at canonical.com>
---
 debian/rules.d/2-binary-arch.mk |    4 ++--
 debian/scripts/sub-flavour      |    4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/debian/rules.d/2-binary-arch.mk b/debian/rules.d/2-binary-arch.mk
index c31ab14..9765ef7 100644
--- a/debian/rules.d/2-binary-arch.mk
+++ b/debian/rules.d/2-binary-arch.mk
@@ -54,13 +54,13 @@ install-%: $(stampdir)/stamp-build-% checks-%
 	# compress_file logic required because not all architectures
 	# generate a zImage automatically out of the box
 ifeq ($(compress_file),)
-	install -m644 -D $(builddir)/build-$*/$(kernel_file) \
+	install -m600 -D $(builddir)/build-$*/$(kernel_file) \
 		$(pkgdir)/boot/$(install_file)-$(abi_release)-$*
 else
 	install -d $(pkgdir)/boot
 	gzip -c9v $(builddir)/build-$*/$(kernel_file) > \
 		$(pkgdir)/boot/$(install_file)-$(abi_release)-$*
-	chmod 644 $(pkgdir)/boot/$(install_file)-$(abi_release)-$*
+	chmod 600 $(pkgdir)/boot/$(install_file)-$(abi_release)-$*
 endif
 
 	install -m644 $(builddir)/build-$*/.config \
diff --git a/debian/scripts/sub-flavour b/debian/scripts/sub-flavour
index 45456bb..0100493 100644
--- a/debian/scripts/sub-flavour
+++ b/debian/scripts/sub-flavour
@@ -11,9 +11,9 @@ from_moddir="debian/$from_pkg/lib/modules/$ABI_RELEASE-$FROM"
 to_moddir="debian/$to_pkg/lib/modules/$ABI_RELEASE-$FROM"
 
 install -d "debian/$to_pkg/boot"
-install -m644 debian/$from_pkg/boot/{vmlinuz,config}-$ABI_RELEASE-$FROM \
+install -m644 debian/$from_pkg/boot/config-$ABI_RELEASE-$FROM \
 	debian/$to_pkg/boot/
-install -m600 debian/$from_pkg/boot/System.map-$ABI_RELEASE-$FROM \
+install -m600 debian/$from_pkg/boot/{vmlinuz,System.map}-$ABI_RELEASE-$FROM \
 	debian/$to_pkg/boot/
 
 #
-- 
1.7.4.1

-- 
Kees Cook
Ubuntu Security Team