# SPDX-License-Identifier: GPL-2.0-only # # Copyright (C) 2006-2013 OpenWrt.org # Copyright (C) 2016 LEDE Project config EXPERIMENTAL bool "Enable experimental features by default" help Set this option to build with latest bleeding edge features which may or may not work as expected. If you would like to help the development of OpenWrt, you are encouraged to set this option and provide feedback (both positive and negative). But do so only if you know how to recover your device in case of flashing potentially non-working firmware. If you plan to use this build in production, say NO! menu "Global build settings" config JSON_OVERVIEW_IMAGE_INFO bool "Create JSON info file overview per target" default y help Create a JSON info file called profiles.json in the target directory containing machine readable list of built profiles and resulting images. config JSON_CYCLONEDX_SBOM bool "Create CycloneDX SBOM JSON" default BUILDBOT help Create a JSON files *.bom.cdx.json in the build directory containing Software Bill Of Materials in CycloneDX format. config ALL_NONSHARED bool "Select all target specific packages by default" select ALL_KMODS default BUILDBOT config ALL_KMODS bool "Select all kernel module packages by default" config ALL bool "Select all userspace packages by default" select ALL_KMODS select ALL_NONSHARED config BUILDBOT bool "Set build defaults for automatic builds (e.g. via buildbot)" help This option changes several defaults to be more suitable for automatic builds. This includes the following changes: - Deleting build directories after compiling (to save space) - Enabling per-device rootfs support ... config SIGNED_PACKAGES bool "Cryptographically signed package lists" default y config SIGNATURE_CHECK bool "Enable signature checking in opkg" default SIGNED_PACKAGES config DOWNLOAD_CHECK_CERTIFICATE bool "Enable TLS certificate verification during package download" default y config USE_APK imply PACKAGE_apk-mbedtls bool "Use APK instead of OPKG to build distribution (EXPERIMENTAL)" default y comment "General build options" config TESTING_KERNEL bool "Use the testing kernel version" depends on HAS_TESTING_KERNEL default EXPERIMENTAL help If the target supports a newer kernel version than the default, you can use this config option to enable it config DISPLAY_SUPPORT bool "Show packages that require graphics support (local or remote)" config BUILD_PATENTED bool "Compile with support for patented functionality" help When this option is disabled, software which provides patented functionality will not be built. In case software provides optional support for patented functionality, this optional support will get disabled for this package. config BUILD_NLS bool "Compile with full language support" help When this option is enabled, packages are built with the full versions of iconv and GNU gettext instead of the default OpenWrt stubs. If uClibc is used, it is also built with locale support. config SHADOW_PASSWORDS bool default y config CLEAN_IPKG bool prompt "Remove ipkg/opkg status data files in final images" help This removes all ipkg/opkg status data files from the target directory before building the root filesystem. config IPK_FILES_CHECKSUMS bool prompt "Record files checksums in package metadata" depends on !USE_APK help This makes file checksums part of package metadata. It increases size but provides you with pkg_check command to check for flash corruptions. config INCLUDE_CONFIG bool "Include build configuration in firmware" if DEVEL help If enabled, buildinfo files will be stored in /etc/build.* of firmware. config REPRODUCIBLE_DEBUG_INFO bool "Make debug information reproducible" default BUILDBOT help This strips the local build path out of debug information. This has the advantage of making it reproducible, but the disadvantage of making local debugging using ./scripts/remote-gdb harder, since the debug data will no longer point to the full path on the build host. config COLLECT_KERNEL_DEBUG bool prompt "Collect kernel debug information" select KERNEL_DEBUG_INFO default BUILDBOT help This collects debugging symbols from the kernel and all compiled modules. Useful for release builds, so that kernel issues can be debugged offline later. menu "Kernel build options" source "config/Config-kernel.in" endmenu comment "Package build options" config DEBUG bool prompt "Compile packages with debugging info" help Adds -g3 to the CFLAGS. config USE_GC_SECTIONS bool prompt "Dead code and data elimination for all packages (EXPERIMENTAL)" help Places functions and data items into its own sections to use the linker's garbage collection capabilites. Packages can choose to opt-out via setting PKG_BUILD_FLAGS:=no-gc-sections config USE_LTO bool prompt "Use the link-time optimizer for all packages (EXPERIMENTAL)" help Adds LTO flags to the CFLAGS and LDFLAGS. Packages can choose to opt-out via setting PKG_BUILD_FLAGS:=no-lto config MOLD depends on (aarch64 || arm || i386 || i686 || m68k || powerpc || powerpc64 || sh4 || x86_64) depends on !GCC_USE_VERSION_11 def_bool $(shell, ./config/check-hostcxx.sh 10 2 12) config USE_MOLD bool prompt "Use the mold linker for all packages" depends on MOLD help Link packages with mold, a modern linker Packages can opt-out via setting PKG_BUILD_FLAGS:=no-mold config IPV6 def_bool y comment "Stripping options" choice prompt "Binary stripping method" default USE_STRIP if USE_GLIBC default USE_SSTRIP help Select the binary stripping method you wish to use. config NO_STRIP bool "none" help This will install unstripped binaries (useful for native compiling/debugging). config USE_STRIP bool "strip" help This will install binaries stripped using strip from binutils. config USE_SSTRIP bool "sstrip" depends on !USE_GLIBC help This will install binaries stripped using sstrip. endchoice config STRIP_ARGS string prompt "Strip arguments" depends on USE_STRIP default "--strip-unneeded --remove-section=.comment --remove-section=.note" if DEBUG default "--strip-all" help Specifies arguments passed to the strip command when stripping binaries. config SSTRIP_DISCARD_TRAILING_ZEROES bool "Strip trailing zero bytes" depends on USE_SSTRIP && !USE_MOLD default y help Use sstrip's -z option to discard trailing zero bytes config STRIP_KERNEL_EXPORTS bool "Strip unnecessary exports from the kernel image" depends on BROKEN help Reduces kernel size by stripping unused kernel exports from the kernel image. Note that this might make the kernel incompatible with any kernel modules that were not selected at the time the kernel image was created. config USE_MKLIBS bool "Strip unnecessary functions from libraries" help Reduces libraries to only those functions that are necessary for using all selected packages (including those selected as ). Note that this will make the system libraries incompatible with most of the packages that are not selected during the build process. comment "Hardening build options" config PKG_CHECK_FORMAT_SECURITY bool prompt "Enable gcc format-security" default y help Add -Wformat -Werror=format-security to the CFLAGS. You can disable this per package by adding PKG_CHECK_FORMAT_SECURITY:=0 in the package Makefile. choice prompt "User space ASLR PIE compilation" default PKG_ASLR_PIE_NONE if ((SMALL_FLASH || LOW_MEMORY_FOOTPRINT) && !SDK) default PKG_ASLR_PIE_REGULAR help Add -fPIC to CFLAGS and -specs=hardened-build-ld to LDFLAGS. This enables package build as Position Independent Executables (PIE) to protect against "return-to-text" attacks. This belongs to the feature of Address Space Layout Randomisation (ASLR), which is implemented by the kernel and the ELF loader by randomising the location of memory allocations. This makes memory addresses harder to predict when an attacker is attempting a memory-corruption exploit. You can disable this per package by adding PKG_ASLR_PIE:=0 in the package Makefile. Be ware that ASLR increases the binary size. config PKG_ASLR_PIE_NONE bool "None" help PIE is deactivated for all applications config PKG_ASLR_PIE_REGULAR bool "Regular" help PIE is activated for some binaries, mostly network exposed applications config PKG_ASLR_PIE_ALL bool "All" select BUSYBOX_DEFAULT_PIE help PIE is activated for all applications endchoice choice prompt "User space Stack-Smashing Protection" default PKG_CC_STACKPROTECTOR_REGULAR help Enable GCC Stack Smashing Protection (SSP) for userspace applications config PKG_CC_STACKPROTECTOR_NONE bool "None" help No stack smashing protection. config PKG_CC_STACKPROTECTOR_REGULAR bool "Regular" help Protects functions with vulnerable objects. This includes functions with buffers larger than 8 bytes or calls to alloca. config PKG_CC_STACKPROTECTOR_STRONG bool "Strong" help Like Regular, but also protects functions with local arrays or references to local frame addresses. config PKG_CC_STACKPROTECTOR_ALL bool "All" help Protects all functions. endchoice choice prompt "Kernel space Stack-Smashing Protection" default KERNEL_CC_STACKPROTECTOR_REGULAR help Enable GCC Stack-Smashing Protection (SSP) for the kernel config KERNEL_CC_STACKPROTECTOR_NONE bool "None" help No stack smashing protection. config KERNEL_CC_STACKPROTECTOR_REGULAR bool "Regular" help Protects functions with vulnerable objects. This includes functions with buffers larger than 8 bytes or calls to alloca. config KERNEL_CC_STACKPROTECTOR_STRONG bool "Strong" help Like Regular, but also protects functions with local arrays or references to local frame addresses. endchoice config KERNEL_STACKPROTECTOR bool default KERNEL_CC_STACKPROTECTOR_REGULAR || KERNEL_CC_STACKPROTECTOR_STRONG config KERNEL_STACKPROTECTOR_STRONG bool default KERNEL_CC_STACKPROTECTOR_STRONG choice prompt "Enable buffer-overflows detection (FORTIFY_SOURCE)" default PKG_FORTIFY_SOURCE_1 help Enable the _FORTIFY_SOURCE macro which introduces additional checks to detect buffer-overflows in the following standard library functions: memcpy, mempcpy, memmove, memset, strcpy, stpcpy, strncpy, strcat, strncat, sprintf, vsprintf, snprintf, vsnprintf, gets. "Conservative" (_FORTIFY_SOURCE set to 1) only introduces checks that shouldn't change the behavior of conforming programs, while "aggressive" (_FORTIFY_SOURCES set to 2) some more checking is added, but some conforming programs might fail. config PKG_FORTIFY_SOURCE_NONE bool "None" config PKG_FORTIFY_SOURCE_1 bool "Conservative" config PKG_FORTIFY_SOURCE_2 bool "Aggressive" endchoice choice prompt "Enable RELRO protection" default PKG_RELRO_FULL help Enable a link-time protection known as RELRO (Relocation Read Only) which helps to protect from certain type of exploitation techniques altering the content of some ELF sections. "Partial" RELRO makes the .dynamic section not writeable after initialization, introducing almost no performance penalty, while "full" RELRO also marks the GOT as read-only at the cost of initializing all of it at startup. config PKG_RELRO_NONE bool "None" config PKG_RELRO_PARTIAL bool "Partial" config PKG_RELRO_FULL bool "Full" endchoice config TARGET_ROOTFS_SECURITY_LABELS bool select KERNEL_SQUASHFS_XATTR select KERNEL_EXT4_FS_SECURITY select KERNEL_F2FS_FS_SECURITY select KERNEL_UBIFS_FS_SECURITY select KERNEL_JFFS2_FS_SECURITY config SELINUX bool "Enable SELinux" select KERNEL_SECURITY_SELINUX select TARGET_ROOTFS_SECURITY_LABELS select PACKAGE_procd-selinux select PACKAGE_busybox-selinux help This option enables SELinux kernel features, applies security labels in squashfs rootfs and selects the selinux-variants of busybox and procd. Selecting this option results in about 0.5MiB of additional flash space usage accounting for increased kernel and rootfs size. choice prompt "default SELinux type" depends on TARGET_ROOTFS_SECURITY_LABELS default SELINUXTYPE_dssp help Select SELinux policy to be installed and used for applying rootfs labels. config SELINUXTYPE_targeted bool "targeted" select PACKAGE_refpolicy help SELinux Reference Policy (refpolicy) config SELINUXTYPE_dssp bool "dssp" select PACKAGE_selinux-policy help Defensec SELinux Security Policy -- OpenWrt edition endchoice config SECCOMP bool "Enable SECCOMP" select KERNEL_SECCOMP select PACKAGE_procd-seccomp depends on (aarch64 || arm || armeb || mips || mipsel || mips64 || mips64el || i386 || powerpc || x86_64) depends on !TARGET_uml default y help This option enables seccomp kernel features to safely execute untrusted bytecode and selects the seccomp-variants of procd endmenu