Re: [gentoo-dev] Vanilla sources

["Toralf Förster" <toralf@gentoo.org>]

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On 1/3/20 3:46 PM, Rich Freeman wrote:
> If OpenRC contains a vulnerability wouldn't it make more sense to set
> this as part of OpenRC,
Indeed.

Furthermore there's a nifty page https://kernsec.org/wiki/index.php/Kernel_Self_Protection_Project/Recommended_Settings
which yields for me to this /etc/sysctl.d/local.conf :


#       Restrict potential illegal access via links
# 
fs.protected_hardlinks = 1
fs.protected_symlinks = 1 

#
# https://kernsec.org/wiki/index.php/Kernel_Self_Protection_Project#CONFIGs
#

# 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

# Block non-uid-0 profiling (needs distro patch, otherwise this is the same as "= 2")
kernel.perf_event_paranoid = 3

# Turn off kexec, even if it's built in.
kernel.kexec_load_disabled = 1

# Avoid non-ancestor ptrace access to running processes and their credentials.
kernel.yama.ptrace_scope = 1

# Disable User Namespaces, as it opens up a large attack surface to unprivileged users.
user.max_user_namespaces = 0

# Turn off unprivileged eBPF access.
kernel.unprivileged_bpf_disabled = 1

# Turn on BPF JIT hardening, if the JIT is enabled.
net.core.bpf_jit_harden = 2


-- 
Toralf
PGP 23217DA7 9B888F45


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