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| author | Silvino <silvino@bk.ru> | 2021-02-25 23:22:17 +0000 |
|---|---|---|
| committer | Silvino <silvino@bk.ru> | 2021-02-25 23:22:17 +0000 |
| commit | d12b35a47b9a872ecb5e037f1c2b02e1ea8927fb (patch) | |
| tree | 8fdac6dfc8cabb9f85a2db3a3bd628cfe44438cd /linux/linux.html | |
| parent | 0a6b0fc9769daf0932cb207c3285baa31547b489 (diff) | |
| parent | a3628fc49db4d88ff3e4067268650710d1da3f6f (diff) | |
| download | doc-d12b35a47b9a872ecb5e037f1c2b02e1ea8927fb.tar.gz | |
merge openbsd branch into develop
new directory layout
Diffstat (limited to 'linux/linux.html')
| -rw-r--r-- | linux/linux.html | 866 |
1 files changed, 866 insertions, 0 deletions
diff --git a/linux/linux.html b/linux/linux.html new file mode 100644 index 0000000..9d568e9 --- /dev/null +++ b/linux/linux.html @@ -0,0 +1,866 @@ +<!DOCTYPE html> +<html dir="ltr" lang="en"> + <head> + <meta charset='utf-8'> + <title>2.1. Kernel Linux</title> + </head> + <body> + + <a href="index.html">Core OS Index</a> + + <h1 id="kernel">2.1. Kernel Linux</h1> + + <p>Linux is a monolith kernel, a big one ! Visit + <a href="http://www.fsfla.org/ikiwiki/selibre/linux-libre/">Linux Libre</a> + and + <a href="https://www.kernel.org/">Linux Non-Libre</a> pages for more links + and information.</p> + + <p>Spectre-meltdown checker;</p> + <pre> + https://github.com/speed47/spectre-meltdown-checker/ + </pre> + + <h2 id="download">2.1.1. Download Linux Libre</h2> + + <p>Download Linux Source from + <a href="http://linux-libre.fsfla.org/pub/linux-libre/releases/">linux libre</a>, + or using the port system;</p> + + <pre> + $ mkdir ~/kernel + $ cd ~/kernel + $ cd linux-4.9.86/ + </pre> + + <p>Gcc <a href="https://github.com/graysky2/kernel_gcc_patch/">graysky2</a> kernel_gcc_patch (<a href="https://github.com/graysky2/kernel_gcc_patch/archive/master.zip">master.zip</a>) + that adds more cpu options (FLAGS) for native builds. + Check <a href="ports/linux-gnu/Pkgfile">Pkgfile</a> + for instructions how linux-gnu port is built.</p> + + <p>Check version on Makefile;</p> + + <pre> + VERSION = 4 + PATCHLEVEL = 9 + SUBLEVEL = 86 + EXTRAVERSION = -gnu + NAME = Roaring Lionus + </pre> + + <p>Change cpu optimization patch;</p> + + <pre> + depends on (MK8 || MK7 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MATOM || MGEODE_LX) + </pre> + + <p>to;</p> + + <pre> + depends on (MK8 || MK7 || MCORE2 || MPSC || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MATOM || MGEODE_LX) + </pre> + + <p>Apply additional cpu optimizations patch;</p> + + <pre> + $ patch -p1 < ../enable_additional_cpu_optimizations_for_gcc_v4.9%2B_kernel_v3.15%2B.patch + </pre> + + <p>Cleaning targets:</p> + + <pre> + clean - Remove most generated files but keep the config and + enough build support to build external modules + mrproper - Remove all generated files + config + various backup files + distclean - mrproper + remove editor backup and patch files + </pre> + + <p>Prepare sources for configuration;</p> + + <pre> + $ make distclean + </pre> + + <h2 id="configure">2.1.2. Configure</h2> + + <p>Port linux-gnu port comes with default configuration file that is + a good starting point to tune kernel according to your needs. To + automatically configure kernel with support to your hardware + based on modules loaded by current kernel run.</p> + + <pre> + $ make localmodconfig + </pre> + + <p>To get more information about the hardware, for example + information about which graphic module (driver) is in use + as root run;</p> + + <pre> + # lspci -nnk | grep -i vga -A3 | grep 'in use' + Kernel driver in use: i915 + </pre> + + <p>Make configuration targets;</p> + + <pre> + config - Update current config utilising a line-oriented program + nconfig - Update current config utilising a ncurses menu based program + menuconfig - Update current config utilising a menu based program + xconfig - Update current config utilising a Qt based front-end + gconfig - Update current config utilising a GTK+ based front-end + oldconfig - Update current config utilising a provided .config as base + localmodconfig - Update current config disabling modules not loaded + localyesconfig - Update current config converting local mods to core + silentoldconfig - Same as oldconfig, but quietly, additionally update deps + defconfig - New config with default from ARCH supplied defconfig + savedefconfig - Save current config as ./defconfig (minimal config) + allnoconfig - New config where all options are answered with no + allyesconfig - New config where all options are accepted with yes + allmodconfig - New config selecting modules when possible + alldefconfig - New config with all symbols set to default + randconfig - New config with random answer to all options + listnewconfig - List new options + olddefconfig - Same as silentoldconfig but sets new symbols to their default value + kvmconfig - Enable additional options for kvm guest kernel support + xenconfig - Enable additional options for xen dom0 and guest kernel support + tinyconfig - Configure the tiniest possible kernel + </pre> + + <p>Following configuration try's to be generic about the hardware + support while addressing the requirements of applications such as + qemu, docker, etc. For more information about hardening options read + <a href="https://kernsec.org">kernsec.org</a>. Configure kernel + using ncurses;</p> + + <pre> + $ make nconfig + </pre> + + <pre> + CONFIG_BUG_ON_DATA_CORRUPTION=y + + # Perform extensive checks on reference counting. + CONFIG_REFCOUNT_FULL=y + + # Check for memory copies that might overflow a structure in str*() and mem*() functions both at build-time and run-time. + CONFIG_FORTIFY_SOURCE=y + + </pre> + + <h3 id="general">2.1.2.1 General Setup</h3> + <dl> + <dt>CONFIG_POSIX_MQUEUE=y</dt> + <dd>POSIX Message Queues</dd> + + <dt>CONFIG_VMAP_STACK=y</dt> + <dd>Use a virtually-mapped stack</dd> + <dd>Adds guard pages to kernel stacks (not all architectures + support this yet).</dd> + + <dt>CONFIG_CGROUPS=y</dt> + <dd>Control Group support</dd> + + <dt>CONFIG_MEMCG=y</dt> + <dd>Memory controller</dd> + + <dt>CONFIG_MEMCG_SWAP=y</dt> + <dd>Swap controller</dd> + + <dt>CONFIG_MEMCG_SWAP_ENABLED=y</dt> + <dd>Swap controller enabled by default</dd> + + <dt>CONFIG_BLK_CGROUP=y</dt> + <dd>IO controller</dd> + + <dt>CGROUP_SCHED=y</dt> + <dd>CPU controller</dd> + + <dt>FAIR_GROUP_SCHED=y</dt> + <dd>Group scheduling for SCHED_OTHER</dd> + + <dt>CONFIG_CFS_BANDWIDTH=y</dt> + <dd>CPU bandwidth provisioning for FAIR_GROUP_SCHED</dd> + + <dt>CONFIG_RT_GROUP_SCHED=y</dt> + <dd>Group scheduling for SCHED_RR/FIFO</dd> + + <dt>CONFIG_CGROUP_PIDS=y</dt> + <dd>PIDs controller</dd> + + <dd>Freezer controller</dd> + <dd>HugeTLB controller</dd> + <dd>Cpuset controller</dd> + <dd>Include legacy /proc/<pid>/cpuset file</dd> + <dd>Device controller</dd> + <dd>Simple CPU accounting controller</dd> + <dd>Perf controller</dd> + </dl> + + <h4>Namespaces support</h4> + <dl> + <dd>UTS namespace</dd> + <dd>IPC namespace</dd> + <dd>User namespace</dd> + <dd>PID Namespaces</dd> + <dd>Network namespace</dd> + </dl> + + <dl> + + <dt>CONFIG_COMPAT_BRK=n</dt> + <dd>Disable heap randomization</dd> + <dd>Dangerous; enabling this disables brk ASLR.</dd> + + <dt>CONFIG_SLAB_FREELIST_RANDOM=y</dt> + <dd>Randomize allocator freelists, harden metadata.</dd> + + <dt>CONFIG_SLAB_FREELIST_HARDENED=y</dt> + <dd>Randomize allocator freelists, harden metadata.</dd> + + <dt>CONFIG_SLUB_DEBUG=y<dt> + <dd>Enable SLUB debugging support</dd> + <dd>Allow allocator validation checking to be enabled + (see "slub_debug=P" below).</dd> + + <dt>CONFIG_CC_STACKPROTECTOR=y</dt> + <dd>Use -fstack-protector-strong (gcc 4.9+) for best stack canary coverage.</dd> + + <dt>CONFIG_CC_STACKPROTECTOR_STRONG=y</dt> + <dd>Use -fstack-protector-strong (gcc 4.9+) for best stack canary coverage.</dd> + </dl> + + + <h3 id="mod">2.1.2.2 Enable loadable module support</h3> + <dl> + + <dt>CONFIG_MODULES=y</dt> + <dd>Enable loadable module support + <dd>Keep root from altering kernel memory via loadable modules. + set CONFIG_MODULES=n</dd> + <dd>But if CONFIG_MODULE=y is needed, at least they must be + signed with a per-build key.<dd> + + <dt>CONFIG_DEBUG_SET_MODULE_RONX=y</dt> + <dd>(prior to v4.11)</dd> + + <dt>CONFIG_STRICT_MODULE_RWX=y</dt> + <dd>(since v4.11)</dd> + + <dt>CONFIG_MODULE_SIG=y</dt> + <dd>Module signature verification</dd> + + <dt>CONFIG_MODULE_SIG_FORCE=y</dt> + <dd>Require modules to be validly signed</dd> + + <dt>CONFIG_MODULE_SIG_ALL=y</dt> + <dd>Automatically sign all modules</dd> + + <dt>CONFIG_MODULE_SIG_SHA512=y</dt> + <dd>Sign modules with SHA-512</dd> + </dl> + + <h3 id="block">2.1.2.3 Enable the block layer</h3> + <dl> + <dt>BLK_DEV_THROTTLING=y</dt> + <dd>Block layer bio throttling support</dd> + + <dt>IOSCHED_CFQ=y</dt> + <dd>CFQ IO scheduler</dd> + + <dt>CONFIG_CFQ_GROUP_IOSCHED=y</dt> + <dd>CFQ Group Scheduling support</dd> + </dl> + + <h3 id="proc">2.1.2.4 Processor type and features</h3> + + <dl> + <dt>CONFIG_DEFAULT_MMAP_MIN_ADDR=65536</dt> + <dd>Low address space to protect from user allocation</dd> + <dd>Disallow allocating the first 64k of memory.</dd> + + <dt>X86_VSYSCALL_EMULATION=n</dt> + <dd>Enable vsyscall emulation</dd> + <dd>Required by programs before 2013, some programs my + require.</dd> + <dd>Remove additional attack surface, unless you really + need them.</dd> + + <dt>CONFIG_SECCOMP=y</dt> + <dd>Enable seccomp to safely compute untrusted bytecode</dd> + <dd>Provide userspace with seccomp BPF API for syscall attack surface reduction.</dd> + + <dt>CONFIG_SECCOMP_FILTER=y</dt> + <dd>Provide userspace with seccomp BPF API for syscall attack surface reduction.</dd> + + <dt>CONFIG_KEXEC=n</dt> + <dd>kexec system call</dd> + <dd>Dangerous; enabling this allows replacement + of running kernel.</dd> + + <dt>CONFIG_RANDOMIZE_BASE=y</dt> + <dd>Randomize the address of the kernel image (KASLR)</dd> + + <dt>CONFIG_RANDOMIZE_MEMORY=y</dt> + <dd>Randomize the kernel memory sections</dd> + + <dt>CONFIG_LEGACY_VSYSCALL_NONE=y</dt> + <dd>vsyscall table for legacy applications (None)</dd> + <dd>Modern libc no longer needs a fixed-position mapping in userspace, remove it as a possible target.</dd> + + <dt>CONFIG_COMPAT_VDSO=n</dt> + <dd>Disable the 32-bit vDSO (needed for glibc 2.3.3)</dd> + <dd>Dangerous; enabling this disables VDSO ASLR.</dd> + + <dt>CONFIG_MODIFY_LDT_SYSCALL=n</dt> + <dd>Enable the LDT (local descriptor table)</dd> + <dd>Remove additional attack surface, unless you really need them.</dd> + </dl> + + <h3 id="acpi">2.1.2.5 Power management and ACPI options</h3> + + <dl> + <dt>CONFIG_HIBERNATION=n</dt> + <dd>Hibernation (aka 'suspend to disk')</dd> + <dd>Dangerous; enabling this allows replacement of running + kernel.</dd> + + <dt>CONFIG_ACPI_CUSTOM_METHOD=n</dt> + <dd>Allow ACPI methods to be inserted/replaced at run time</dd> + <dd>Dangerous; enabling this allows direct physical + memory writing.</dd> + </dl> + + + <h3 id="bus">2.1.2.6 Bus options (PCI etc.)</h3> + <h3 id="exec">2.1.2.7 Executable file formats / Emulations</h3> + <dl> + + <dt>CONFIG_BINFMT_MISC=n</dt> + <dd>Kernel support for MISC binaries</dd> + <dd>Easily confused by misconfigured userspace, keep off.</dd> + + <dt>CONFIG_IA32_EMULATION</dt> + <dd>Remove additional attack surface, unless you really need them.</dd> + <dt>CONFIG_X86_X32</dt> + <dd>Remove additional attack surface, unless you really need them.</dd> + </dl> + + <h3 id="net">2.1.2.8 Networking support</h3> + <h4>Networking options</h4> + <dl> + <dt>CONFIG_INET_DIAG=m</dt> + <dd>INET: socket monitoring interface</dd> + <dd>Support for INET (TCP, DCCP, etc) socket monitoring + interface used by native Linux tools such as ss. ss is + included in iproute2</dd> + <dd>Prior to v4.1, assists heap memory attacks; + best to keep interface disabled.</dd> + + <dt>CONFIG_BRIDGE=y</dt> + <dd>802.1d Ethernet Bridging</dd> + + <dt>CONFIG_NET_SCHED=y</dt> + <dd>QoS and/or fair queueing</dd> + + <dt>CONFIG_NET_CLS_CGROUP=y</dt> + <dd>Control Group Classifier</dd> + + <dt>CONFIG_VSOCKETS=y</dt> + <dd>Virtual Socket protocol</dd> + + <dt>CONFIG_VIRTIO_VSOCKETS=y<dt> + <dd>virtio transport for Virtual Sockets</dd> + + <dt>CONFIG_NET_L3_MASTER_DEV=y</dt> + <dd>L3 Master device support</dd> + + <dt>CONFIG_CGROUP_NET_PRIO=y</dt> + <dd>Network priority cgroup</dd> + + <dt>CGROUP_NET_CLASSID=y</dt> + <dd>Network classid cgroup</dd> + + </dl> + + <dl> + <dt>CONFIG_NETFILTER=y</dt> + <dd>Network packet filtering framework (Netfilter)</dd> + + <dt>CONFIG_NETFILTER_ADVANCED=y</dt> + <dd>Advanced netfilter configuration</dd> + + <dt>BRIDGE_NETFILTER=y</dt> + <dd>Bridged IP/ARP packets filtering</dd> + + <dt>NF_CONNTRACK=y</dt> + <dd>Netfilter connection tracking support</dd> + + <dt>NETFILTER_XT_MATCH_ADDRTYPE=y</dt> + <dd>"addrtype" address type match support</dd> + + <dt>NETFILTER_XT_MATCH_CONNTRACK=y</dt> + <dd>"conntrack" connection tracking match support</dd> + + <dt>CONFIG_NETFILTER_XT_MATCH_IPVS=y</dt> + <dd>"ipvs" match support</dd> + + <dt>CONFIG_IP_VS=y</dt> + <dd>IP virtual server support</dd> + + <dt>IP_VS_PROTO_TCP=y</dt> + <dd>TCP load balancing support</dd> + + <dt>IP_VS_PROTO_UDP=y</dt> + <dd>UDP load balancing support</dd> + + <dt>IP_VS_RR=y</dt> + <dd>round-robin scheduling</dd> + + <dt>IP_VS_NFCT=y</dt> + <dd>Netfilter connection tracking</dd> + + <dt>CONFIG_NF_CONNTRACK_IPV4=y</dt> + <dd>IPv4 connection tracking support (required for NAT)</dd> + + <dt>NF_NAT_IPV4=y</dt> + <dd>IPv4 NAT</dd> + + <dt>NF_NAT_MASQUERADE_IPV4=y</dt> + <dd>IPv4 masquerade support</dd> + + <dt>IP_NF_IPTABLES=y</dt> + <dd>IP tables support (required for filtering/masq/NAT)</dd> + + <dt>IP_NF_FILTER=y</dt> + <dd>Packet filtering</dd> + + <dt>CONFIG_IP_NF_NAT=y</dt> + <dd>iptables NAT support</dd> + + <dt>IP_NF_TARGET_MASQUERADE=y</dt> + <dd>MASQUERADE target support</dd> + + <dt>IP_NF_TARGET_NETMAP=y</dt> + <dd>NETMAP target support</dd> + + <dt>IP_NF_TARGET_REDIRECT=y</dt> + <dd>REDIRECT target support</dd> + + <dt>CONFIG_SYN_COOKIES=y</dt> + <dd>IP: TCP syncookie support</dd> + <dd>Provides some protections against SYN flooding.</dd> + + </dl> + + <h3 id="drivers">2.1.2.9 Device Drivers</h3> + + <h4>Block devices</h4> + <dl> + <dt>CONFIG_VIRTIO_BLK=y</dt> + <dd>This is the virtual block driver for virtio.</dd> + <dd>For QEMU based VMMs.</dd> + <dt>BLK_DEV_NBD=y</dt> + <dd>Network block device support.</dd> + </dl> + + <h4>SCSI device support</h4> + <dl> + <dt>CONFIG_SCSI_VIRTIO=y</dt> + <dd>This is the virtual HBA driver for virtio. + If the kernel will used in a virtual machine.</dd> + </dl> + + <h4>Multiple devices driver support (RAID and LVM)</h4> + + <dl> + <dt>CONFIG_MD=y</dt> + <dd>Multiple devices driver support (RAID and LVM)</dd> + <dt>CONFIG_BLK_DEV_DM=y</dt> + <dd>Device mapper support</dd> + <dt>DM_THIN_PROVISIONING=y</dt> + <dd>Thin provisioning target<dd> + </dl> + + <h4>Network device support</h4> + + <dl> + <dt>CONFIG_NETDEVICES=y</dt> + <dd>Network device support</dd> + + <dt>NET_CORE=y</dt> + <dd>Network core driver support</dd> + + <dt>CONFIG_DUMMY=y</dt> + <dd>Dummy net driver support</dd> + + <dt>CONFIG_MACVLAN=y</dt> + <dd>MAC-VLAN support</dd> + <dd>This allows one to create virtual interfaces that map + packets to or from specific MAC addresses to a particular + interface. Macvlan devices can be added using the "ip" command + from the route2 package starting with the iproute2.</dd> + <dd>ip link add link <real dev> [ address MAC ] [ NAME ] type macvlan"</dd> + + <dt>CONFIG_VXLAN=y</dt> + <dd>Virtual eXtensible Local Area Network (VXLAN)</dd> + <dt>BLK_DEV_NBD=y</dt> + <dd>Network block device support.</dd> + + <dt>CONFIG_TUN=y</dt> + <dd>Universal TUN/TAP device driver support</dd> + + <dt>CONFIG_VETH=y</dt> + <dd>Virtual ethernet pair device.</dd> + + <dt>CONFIG_VIRTIO_NET=y</dt> + <dd>Virtio network driver.</dd> + + <dt>IPVLAN=n</dt> + <dd>IP-VLAN support</dd> + <dd>Requires ipv6</dd> + </dl> + + <h4>Character devices</h4> + <dl> + <dt>CONFIG_DEVMEM=n</dt> + <dd>/dev/mem virtual device support</dd> + <dd>Do not allow direct physical memory access (but if you must have it, at least enable CONFIG_STRICT_DEVMEM mode...)</dd> + + <dd>Enable TTY</dd> + <dd>Unix98 PTY support</dd> + + <dt>CONFIG_LEGACY_PTYS=n</dt> + <dd>Legacy (BSD) PTY support</dd> + <dd>Use the modern PTY interface (devpts) only.</dd> + + <dd>Support multiple instances of devpts</dd> + + <dt>CONFIG_DEVKMEM=n</dt> + <dd>/dev/kmem virtual device support</dd> + <dd>Dangerous; enabling this allows direct kernel + memory writing.</dd> + </dl> + + <h4>Virtio drivers</h4> + <dl> + <dt>CONFIG_VIRTIO_PCI=y</dt> + <dd>PCI driver for virtio devices</dd> + </dl> + + <h3 id="firm">2.1.2.10 Firmware Drivers</h3> + <h3 id="fs">2.1.2.11 File systems</h3> + <dl> + <dd>Overlay filesystem support</dd> + + <dt>CONFIG_PROC_KCORE=n</dt> + <dd>/proc/kcore support</dd> + <dd>Dangerous; exposes kernel text image layout.</dd> + + <dd>HugeTLB file system support</dd> + + <dt>CONFIG_FUSE_FS=y</dt> + <dd>FUSE (Filesystem in Userspace) support</dd> + + </dl> + + <h3 id="hack">2.1.2.12 Kernel hacking</h3> + + <dl> + <dt>CONFIG_DEBUG=y</dt> + <dt>CONFIG_DEBUG_RODATA=y</dt> + + <dt>CONFIG_DEBUG_KERNEL=y</dt> + <dd>Kernel debugging</dd> + <dd>Make sure kernel page tables have safe permissions.</dd> + + <dt>CONFIG_STRICT_KERNEL_RWX=y</dt> + <dd>since v4.11</dd> + <dd>Make sure kernel page tables have safe permissions.</dd> + + <dt>CONFIG_PANIC_ON_OOPS=y</dt> + <dd>Panic on Oops</dd> + <dd>This feature is useful to ensure that the kernel does not do + anything erroneous after an oops which could result in data + corruption or other issues.</dd> + + <dt>CONFIG_PANIC_TIMEOUT=-1</dt> + <dd>Reboot devices immediately if kernel experiences an Oops.</dd> + + <dt>CONFIG_SCHED_STACK_END_CHECK=y</dt> + <dd>Detect stack corruption on calls to schedule()</dd> + <dd>Perform additional validation of various commonly targeted structures.</dd> + + <dt>CONFIG_DEBUG_LIST=y</dt> + <dd>Debug linked list manipulation</dd> + <dd>Perform additional validation of various commonly targeted structures.</dd> + + <dt>CONFIG_DEBUG_SG=y</dt> + <dd>Debug SG table operations</dd> + <dd>Perform additional validation of various commonly targeted structures.</dd> + + <dt>CONFIG_DEBUG_NOTIFIERS=y</dt> + <dd>Debug notifier call chains</dd> + <dd>Perform additional validation of various commonly + targeted structures.</dd> + + <dt>CONFIG_DEBUG_CREDENTIALS=y</dt> + <dd>Debug credential management</dd> + <dd>Perform additional validation of various commonly + targeted structures.</dd> + + <dt>CONFIG_STRICT_DEVMEM=y</dt> + <dd>Filter access to /dev/mem</dd> + <dd>Do not allow direct physical memory access (but if you must have it, at least enable STRICT mode...)</dd> + + <dt>CONFIG_IO_STRICT_DEVMEM=y</dt> + <dd>Filter I/O access to /dev/mem</dd> + <dd>Do not allow direct physical memory access (but if you must have it, at least enable STRICT mode...)</dd> + + <dt>CONFIG_DEBUG_WX=y</dt> + <dd>Warn on W+X mappings at boot</dd> + <dd>Report any dangerous memory permissions + (not available on all archs).</dd> + + + </dl> + + <h4>Compile-time checks and compiler options</h4> + <dl> + <dt>CONFIG_DEBUG_FS=y</dt> + <dd>Debug Filesystem</dd> + + </dl> + + <h4>Memory Debugging</h4> + <dl> + <dt>CONFIG_PAGE_POISONING=y</dt> + <dd>Poison pages after freeing</dd> + <dd>Wipe higher-level memory allocations when they are freed + (needs "page_poison=1" command line below).</dd> + + <dt>CONFIG_PAGE_POISONING_NO_SANITY=y</dt> + <dd>Only poison, don't sanity check</dd> + <dd>(If you can afford even more performance penalty, + leave CONFIG_PAGE_POISONING_NO_SANITY=n)</dd> + + <dt>CONFIG_PAGE_POISONING_ZERO=y</dt> + <dd>Use zero for poisoning instead of random data</dd> + + </dl> + + <h3 id="sec">2.1.2.13 Security options</h3> + + <dl> + <dd>Enable access key retention support</dd> + <dd>Enable register of persistent per-UID keyrings</dd> + <dd>ENCRYPTED KEYS</dd> + <dd>Diffie-Hellman operations on retained keys</dd> + + <dt>CONFIG_SECURITY=y</dt> + <dd>Enable different security models</dd> + <dd>Provide userspace with ptrace ancestry protections.</dd> + + <dt>CONFIG_HARDENED_USERCOPY=y</dt> + <dd>Harden memory copies between kernel and userspace</dd> + <dd>Perform usercopy bounds checking.</dd> + + <dt>SECURITY_SELINUX=n</dt> + <dd>NSA SELinux Support</dd> + <dt>CONFIG_SECURITY_SELINUX_DISABLE=n</dt> + <dd>NSA SELinux runtime disable</dd> + <dd>If SELinux can be disabled at runtime, the LSM structures cannot be read-only; keep off.</dd> + + <dt>CONFIG_SECURITY_APPARMOR=y</dt> + <dd>AppArmor support</dd> + <dd>This enables the AppArmor security module. Rquired userspace + tools (if they are not included in your distribution) and further + information may be found at <a href="apparmor.html">AppArmor</a></dd> + <dt>CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE=1</dt> + <dd>AppArmor boot parameter default value</dd> + + <dt>CONFIG_SECURITY_YAMA=y</dt> + <dd>Yama support</dd> + <dd>Provide userspace with ptrace ancestry protections.</dd> + </dl> + + <h3 id="crypt">2.1.2.14 Cryptographic API</h3> + + <dl> + <dt>CONFIG_CRYPTO_LRW</dt> + <dd>Liskov Rivest Wagner, a tweakable, non malleable, non movable + narrow block cipher mode for dm-crypt.</dd> + + <dt>CONFIG_CRYPTO_RMD160=y</dt> + <dt>CONFIG_CRYPTO_RMD256=y</dt> + <dt>CONFIG_CRYPTO_RMD320=y</dt> + <dd>RIPEMD 160/256/320 digest algorithm</dd> + + <dt>CONFIG_CRYPTO_SHA256=y</dt> + <dd>SHA224 and SHA256 digest algorithm<dd> + + <dt>CONFIG_CRYPTO_SHA512=y</dt> + <dd>SHA384 and SHA512 digest algorithms</dd> + + <dt>CONFIG_CRYPTO_WP512=y</dt> + <dd>Whirlpool digest algorithms</dd> + + <dt>CONFIG_CRYPTO_DES3_EDE_X86_64=y</dt> + <dd>DES and Triple DES EDE cipher algorithms<dd> + + <dt>CONFIG_CRYPTO_SERPENT=y</dt> + <dd>Serpent cipher algorithm</dd> + + <dt>CONFIG_CRYPTO_TWOFISH=y<dt> + <dd>Twofish cipher algorithm</dd> + </dl> + + <pre> + * MD4 digest algorithm + * MD5 digest algorithm + * SHA1 digest algorithm + * Blowfish cipher algorithm + * AES cipher algorithms + * CAST5 (CAST-128) cipher algorithm + * CAST6 (CAST-256) cipher algorithm + * Deflate compression algorithm + </pre> + + <h3 id="virt">2.1.2.15 Virtualization</h3> + + <dl> + <dt>CONFIG_KVM=y</dt> + <dd>Kernel-based Virtual Machine (KVM) support</dd> + + <dt>CONFIG_KVM_INTEL=y</dt> + <dd>KVM for Intel processors support</dd> + <dd>Provides support for KVM on Intel processors equipped with the VT extensions.</dd> + + <dt>CONFIG_KVM_AMD=y</dt> + <dd>KVM for AMD processors support</dd> + <dd>Provides support for KVM on AMD processors equipped with the + AMD-V (SVM) extensions.</dd> + + <dt>CONFIG_KVM_DEVICE_ASSIGNMENT=n</dt> + <dd>KVM legacy PCI device assignment support (DEPRECATED)</dd> + + <dt>CONFIG_VHOST_NET=y</dt> + <dd>Host kernel accelerator for virtio net<dd> + + <dt>CONFIG_VHOST_VSOCK=y</dt> + <dd>vhost virtio-vsock driver</dd> + + <dt>CONFIG_VHOST_CROSS_ENDIAN_LEGACY=y</dt> + <dd>Cross-endian support for vhost</dd> + </dl> + + <h3 id="lib">2.1.2.16 Library routines</h3> + + <h2 id="build">2.1.3. Build</h2> + + <p>Make targets;</p> + + <pre> + Other generic targets: + all - Build all targets marked with [*] + * vmlinux - Build the bare kernel + * modules - Build all modules + (default: ./usr) + + Documentation targets: + Linux kernel internal documentation in different formats (Sphinx): + htmldocs - HTML + latexdocs - LaTeX + pdfdocs - PDF + epubdocs - EPUB + xmldocs - XML + cleandocs - clean all generated files + + make SPHINXDIRS="s1 s2" [target] Generate only docs of folder s1, s2 + valid values for SPHINXDIRS are: development-process media gpu 80211 + + make SPHINX_CONF={conf-file} [target] use *additional* sphinx-build + configuration. This is e.g. useful to build with nit-picking config. + + Linux kernel internal documentation in different formats (DocBook): + htmldocs - HTML + pdfdocs - PDF + psdocs - Postscript + xmldocs - XML DocBook + mandocs - man pages + installmandocs - install man pages generated by mandocs + cleandocs - clean all generated DocBook files + + Architecture specific targets (x86): + * bzImage - Compressed kernel image (arch/x86/boot/bzImage) + install - Install kernel using + (your) ~/bin/installkernel or + (distribution) /sbin/installkernel or + install to $(INSTALL_PATH) and run lilo + fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage) + fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage) + fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage) + isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso) + bzdisk/fdimage*/isoimage also accept: + FDARGS="..." arguments for the booted kernel + FDINITRD=file initrd for the booted kernel + + i386_defconfig - Build for i386 + x86_64_defconfig - Build for x86_64 + + make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build + make V=2 [targets] 2 => give reason for rebuild of target + make O=dir [targets] Locate all output files in "dir", including .config + make C=1 [targets] Check all c source with $CHECK (sparse by default) + make C=2 [targets] Force check of all c source with $CHECK + make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections + make W=n [targets] Enable extra gcc checks, n=1,2,3 where + 1: warnings which may be relevant and do not occur too often + 2: warnings which occur quite often but may still be relevant + 3: more obscure warnings, can most likely be ignored + Multiple levels can be combined with W=12 or W=123 + </pre> + + + <pre> + $ make -j $(nproc) bzImage modules + </pre> + + <h2 id="install">2.1.5. Install</h2> + <pre> + modules_install - Install all modules to INSTALL_MOD_PATH (default: /) + firmware_install- Install all firmware to INSTALL_FW_PATH + (default: $(INSTALL_MOD_PATH)/lib/firmware) + modules_prepare - Set up for building external modules + headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH + </pre> + + <pre> + $ sudo make modules_install + $ sudo cp arch/x86/boot/bzImage /boot/vmlinuz-4.9.86-gnu + $ sudo cp System.map /boot/System.map-4.9.86-gnu + </pre> + + <p>Update grub;</p> + + <pre> + # grub-mkconfig -o /boot/grub/grub.cfg + </pre> + + <h2 id="remove">2.1.6. Remove</h2> + + <pre> + $ sudo rm -r /lib/modules/4.9.86-gnu + $ sudo rm /boot/vmlinuz-4.9.86-gnu + $ sudo rm /boot/System.map-4.9.86-gnu + </pre> + + <a href="index.html">Core OS Index</a> + <p>This is part of the Tribu System Documentation. + Copyright (C) 2020 + Tribu Team. + See the file <a href="../fdl-1.3-standalone.html">Gnu Free Documentation License</a> + for copying conditions.</p> + + </body> +</html> |