Change this setting from 1 to 2 so kernel addresses are not displayed even if a user has CAPS_SYSLOG privileges.

See also: - https://lwn.net/Articles/420403/ - https://tails.boum.org/contribute/design/kernel_hardening/

Signed-off-by: Peter Müller peter.mueller@link38.eu --- config/etc/sysctl.conf | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/config/etc/sysctl.conf b/config/etc/sysctl.conf index 011c4287e..345f8f52a 100644 --- a/config/etc/sysctl.conf +++ b/config/etc/sysctl.conf @@ -44,7 +44,7 @@ net.bridge.bridge-nf-call-iptables = 0 net.bridge.bridge-nf-call-arptables = 0

# Try to keep kernel address exposures out of various /proc files (kallsyms, modules, etc). -kernel.kptr_restrict = 1 +kernel.kptr_restrict = 2

# Avoid kernel memory address exposures via dmesg. kernel.dmesg_restrict = 1