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commit 5c62e4739107a7bb167c31c0f353f1ff8a150f2d
Author: Peter Müller <peter.mueller(a)link38.eu>
Date: Thu Jan 3 18:05:40 2019 +0100
prevent kernel address space leak via dmesg or /proc files
Enable runtime sysctl hardening in order to avoid kernel
addresses being disclosed via dmesg (in case it was built
in without restrictions) or various /proc files.
See https://kernsec.org/wiki/index.php/Kernel_Self_Protection_Project/Recommended_Settings
for further information.
Signed-off-by: Peter Müller <peter.mueller(a)ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer(a)ipfire.org>
-----------------------------------------------------------------------
Summary of changes:
setup/setup.nm | 4 +++-
setup/sysctl/kernel-hardening.conf | 6 ++++++
2 files changed, 9 insertions(+), 1 deletion(-)
create mode 100644 setup/sysctl/kernel-hardening.conf
Difference in files:
diff --git a/setup/setup.nm b/setup/setup.nm
index 78d1a5df3..e79fff10d 100644
--- a/setup/setup.nm
+++ b/setup/setup.nm
@@ -5,7 +5,7 @@
name = setup
version = 3.0
-release = 10
+release = 11
arch = noarch
groups = Base Build System/Base
@@ -53,6 +53,8 @@ build
%{BUILDROOT}%{sysconfdir}/sysctl.d/printk.conf
install -m 644 %{DIR_APP}/sysctl/swappiness.conf \
%{BUILDROOT}%{sysconfdir}/sysctl.d/swappiness.conf
+ install -m 644 %{DIR_APP}/sysctl/kernel-hardening.conf \
+ %{BUILDROOT}%{sysconfdir}/sysctl.d/kernel-hardening.conf
end
end
diff --git a/setup/sysctl/kernel-hardening.conf b/setup/sysctl/kernel-hardening.conf
new file mode 100644
index 000000000..6751bbef6
--- /dev/null
+++ b/setup/sysctl/kernel-hardening.conf
@@ -0,0 +1,6 @@
+# Try to keep kernel address exposures out of various /proc files (kallsyms, modules, etc).
+kernel.kptr_restrict = 1
+
+# Avoid kernel memory address exposures via dmesg.
+kernel.dmesg_restrict = 1
+
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