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ef21f3e49d
By feeding more random bits into mmap allocation, the effectiveness of KASLR will be improved, making attacks trying to bypass address randomisation more difficult. Changed sysctl values are: vm.mmap_rnd_bits = 32 (default: 28) vm.mmap_rnd_compat_bits = 16 (default: 8) Signed-off-by: Peter Müller <peter.mueller@ipfire.org> Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
89 lines
2.8 KiB
Plaintext
89 lines
2.8 KiB
Plaintext
net.ipv4.ip_forward = 1
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net.ipv4.ip_dynaddr = 1
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net.ipv4.icmp_echo_ignore_broadcasts = 1
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net.ipv4.icmp_ignore_bogus_error_responses = 1
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net.ipv4.icmp_ratelimit = 1000
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net.ipv4.icmp_ratemask = 6168
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net.ipv4.tcp_syncookies = 1
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net.ipv4.tcp_fin_timeout = 30
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net.ipv4.tcp_syn_retries = 3
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net.ipv4.tcp_synack_retries = 3
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net.ipv4.conf.default.arp_filter = 1
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net.ipv4.conf.default.rp_filter = 0
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net.ipv4.conf.default.accept_redirects = 0
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net.ipv4.conf.default.accept_source_route = 0
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net.ipv4.conf.default.log_martians = 1
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net.ipv4.conf.all.arp_filter = 1
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net.ipv4.conf.all.rp_filter = 0
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net.ipv4.conf.all.accept_redirects = 0
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net.ipv4.conf.all.accept_source_route = 0
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net.ipv4.conf.all.log_martians = 1
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kernel.printk = 1 4 1 7
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vm.mmap_min_addr = 4096
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vm.min_free_kbytes = 8192
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# Disable IPv6 by default.
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net.ipv6.conf.all.disable_ipv6 = 1
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net.ipv6.conf.default.disable_ipv6 = 1
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# Enable netfilter accounting
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net.netfilter.nf_conntrack_acct=1
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# Disable netfilter on bridges.
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net.bridge.bridge-nf-call-ip6tables = 0
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net.bridge.bridge-nf-call-iptables = 0
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net.bridge.bridge-nf-call-arptables = 0
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# Try to keep kernel address exposures out of various /proc files (kallsyms, modules, etc).
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kernel.kptr_restrict = 2
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# Avoid kernel memory address exposures via dmesg.
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kernel.dmesg_restrict = 1
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# Improve KASLR effectiveness for mmap
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vm.mmap_rnd_bits = 32
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vm.mmap_rnd_compat_bits = 16
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# Minimal preemption granularity for CPU-bound tasks:
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# (default: 1 msec# (1 + ilog(ncpus)), units: nanoseconds)
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kernel.sched_min_granularity_ns = 10000000
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# If a workload mostly uses anonymous memory and it hits this limit, the entire
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# working set is buffered for I/O, and any more write buffering would require
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# swapping, so it's time to throttle writes until I/O can catch up. Workloads
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# that mostly use file mappings may be able to use even higher values.
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#
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# The generator of dirty data starts writeback at this percentage (system default
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# is 20%)
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vm.dirty_ratio = 10
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# Start background writeback (via writeback threads) at this percentage (system
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# default is 10%)
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vm.dirty_background_ratio = 3
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# The swappiness parameter controls the tendency of the kernel to move
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# processes out of physical memory and onto the swap disk.
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# 0 tells the kernel to avoid swapping processes out of physical memory
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# for as long as possible
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# 100 tells the kernel to aggressively swap processes out of physical memory
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# and move them to swap cache
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vm.swappiness = 1
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# The total time the scheduler will consider a migrated process
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# "cache hot" and thus less likely to be re-migrated
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# (system default is 500000, i.e. 0.5 ms)
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kernel.sched_migration_cost_ns = 5000000
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# Increase kernel buffer size maximums
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net.ipv4.tcp_rmem = 4096 87380 16777216
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net.ipv4.tcp_wmem = 4096 16384 16777216
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net.ipv4.udp_mem = 3145728 4194304 16777216
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# Enable TCP fast-open
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net.ipv4.tcp_fastopen = 3
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