On 01/14/2011 02:24 PM, Kees Cook wrote:

To complement the 0400 /proc/kallsyms patch, this makes the installed
System.map file mode 0600 so that security vulnerability exploitation
isn't as trivial. This, like kallsyms, does not stop a serious attacker,
since they can always just fetch the package and read the file.

I'm not aware of any non-root consumer of this file, so there should be
no impact. FWIW, my system boots fine with this change.

Signed-off-by: Kees Cook<kees.cook@canonical.com>
---
debian/rules.d/2-binary-arch.mk | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/debian/rules.d/2-binary-arch.mk b/debian/rules.d/2-binary-arch.mk
index 5627af5..c289d11 100644
--- a/debian/rules.d/2-binary-arch.mk
+++ b/debian/rules.d/2-binary-arch.mk
@@ -67,7 +67,7 @@ endif
$(pkgdir)/boot/config-$(abi_release)-$*
install -m644 $(abidir)/$*
$(pkgdir)/boot/abi-$(abi_release)-$*
- install -m644 $(builddir)/build-$*/System.map
+ install -m600 $(builddir)/build-$*/System.map
$(pkgdir)/boot/System.map-$(abi_release)-$*
ifeq ($(no_dumpfile),)
makedumpfile -g $(pkgdir)/boot/vmcoreinfo-$(abi_release)-$*


applied

--
Tim Gardner tim.gardner@canonical.com

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