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do not expose kernel address spaces even to privileged users

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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>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
This commit is contained in:
Peter Müller
2018-08-16 17:29:58 +02:00
committed by Michael Tremer
parent 65ae069c21
commit d5fe332283
1 changed files with 1 additions and 1 deletions
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2
config/etc/sysctl.conf
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@@ -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