1 # SPDX-License-Identifier: GPL-2.0-only
3 # Copyright (C) 2006-2013 OpenWrt.org
4 # Copyright (C) 2016 LEDE Project
7 bool "Enable experimental features by default"
9 Set this option to build with latest bleeding edge features
10 which may or may not work as expected.
11 If you would like to help the development of OpenWrt, you are
12 encouraged to set this option and provide feedback (both
13 positive and negative). But do so only if you know how to
14 recover your device in case of flashing potentially non-working
17 If you plan to use this build in production, say NO!
19 menu "Global build settings"
21 config JSON_OVERVIEW_IMAGE_INFO
22 bool "Create JSON info file overview per target"
25 Create a JSON info file called profiles.json in the target
26 directory containing machine readable list of built profiles
29 config JSON_CYCLONEDX_SBOM
30 bool "Create CycloneDX SBOM JSON"
33 Create a JSON files *.bom.cdx.json in the build
34 directory containing Software Bill Of Materials in CycloneDX
38 bool "Select all target specific packages by default"
43 bool "Select all kernel module packages by default"
46 bool "Select all userspace packages by default"
51 bool "Set build defaults for automatic builds (e.g. via buildbot)"
53 This option changes several defaults to be more suitable for
54 automatic builds. This includes the following changes:
55 - Deleting build directories after compiling (to save space)
56 - Enabling per-device rootfs support
59 config SIGNED_PACKAGES
60 bool "Cryptographically signed package lists"
63 config SIGNATURE_CHECK
64 bool "Enable signature checking in opkg"
65 default SIGNED_PACKAGES
67 config DOWNLOAD_CHECK_CERTIFICATE
68 bool "Enable TLS certificate verification during package download"
71 comment "General build options"
74 bool "Use the testing kernel version"
75 depends on HAS_TESTING_KERNEL
78 If the target supports a newer kernel version than the default,
79 you can use this config option to enable it
82 config DISPLAY_SUPPORT
83 bool "Show packages that require graphics support (local or remote)"
86 bool "Compile with support for patented functionality"
88 When this option is disabled, software which provides patented functionality
89 will not be built. In case software provides optional support for patented
90 functionality, this optional support will get disabled for this package.
93 bool "Compile with full language support"
95 When this option is enabled, packages are built with the full versions of
96 iconv and GNU gettext instead of the default OpenWrt stubs. If uClibc is
97 used, it is also built with locale support.
99 config SHADOW_PASSWORDS
105 prompt "Remove ipkg/opkg status data files in final images"
107 This removes all ipkg/opkg status data files from the target directory
108 before building the root filesystem.
110 config IPK_FILES_CHECKSUMS
112 prompt "Record files checksums in package metadata"
114 This makes file checksums part of package metadata. It increases size
115 but provides you with pkg_check command to check for flash corruptions.
117 config INCLUDE_CONFIG
118 bool "Include build configuration in firmware" if DEVEL
120 If enabled, buildinfo files will be stored in /etc/build.* of firmware.
122 config REPRODUCIBLE_DEBUG_INFO
123 bool "Make debug information reproducible"
126 This strips the local build path out of debug information. This has the
127 advantage of making it reproducible, but the disadvantage of making local
128 debugging using ./scripts/remote-gdb harder, since the debug data will
129 no longer point to the full path on the build host.
131 config COLLECT_KERNEL_DEBUG
133 prompt "Collect kernel debug information"
134 select KERNEL_DEBUG_INFO
137 This collects debugging symbols from the kernel and all compiled modules.
138 Useful for release builds, so that kernel issues can be debugged offline
141 menu "Kernel build options"
143 source "config/Config-kernel.in"
147 comment "Package build options"
151 prompt "Compile packages with debugging info"
153 Adds -g3 to the CFLAGS.
155 config USE_GC_SECTIONS
157 prompt "Dead code and data elimination for all packages (EXPERIMENTAL)"
159 Places functions and data items into its own sections to use the linker's
160 garbage collection capabilites.
161 Packages can choose to opt-out via setting PKG_BUILD_FLAGS:=no-gc-sections
165 prompt "Use the link-time optimizer for all packages (EXPERIMENTAL)"
167 Adds LTO flags to the CFLAGS and LDFLAGS.
168 Packages can choose to opt-out via setting PKG_BUILD_FLAGS:=no-lto
171 depends on (aarch64 || arm || i386 || i686 || m68k || powerpc || powerpc64 || sh4 || x86_64)
172 depends on !GCC_USE_VERSION_11
173 def_bool $(shell, ./config/check-hostcxx.sh 10 2 12)
177 prompt "Use the mold linker for all packages"
180 Link packages with mold, a modern linker
181 Packages can opt-out via setting PKG_BUILD_FLAGS:=no-mold
186 comment "Stripping options"
189 prompt "Binary stripping method"
190 default USE_STRIP if USE_GLIBC
193 Select the binary stripping method you wish to use.
198 This will install unstripped binaries (useful for native
199 compiling/debugging).
204 This will install binaries stripped using strip from binutils.
208 depends on !USE_GLIBC
210 This will install binaries stripped using sstrip.
215 prompt "Strip arguments"
217 default "--strip-unneeded --remove-section=.comment --remove-section=.note" if DEBUG
218 default "--strip-all"
220 Specifies arguments passed to the strip command when stripping binaries.
222 config SSTRIP_DISCARD_TRAILING_ZEROES
223 bool "Strip trailing zero bytes"
224 depends on USE_SSTRIP && !USE_MOLD
227 Use sstrip's -z option to discard trailing zero bytes
229 config STRIP_KERNEL_EXPORTS
230 bool "Strip unnecessary exports from the kernel image"
232 Reduces kernel size by stripping unused kernel exports from the kernel
233 image. Note that this might make the kernel incompatible with any kernel
234 modules that were not selected at the time the kernel image was created.
237 bool "Strip unnecessary functions from libraries"
239 Reduces libraries to only those functions that are necessary for using all
240 selected packages (including those selected as <M>). Note that this will
241 make the system libraries incompatible with most of the packages that are
242 not selected during the build process.
244 comment "Hardening build options"
246 config PKG_CHECK_FORMAT_SECURITY
248 prompt "Enable gcc format-security"
251 Add -Wformat -Werror=format-security to the CFLAGS. You can disable
252 this per package by adding PKG_CHECK_FORMAT_SECURITY:=0 in the package
256 prompt "User space ASLR PIE compilation"
257 default PKG_ASLR_PIE_NONE if ((SMALL_FLASH || LOW_MEMORY_FOOTPRINT) && !SDK)
258 default PKG_ASLR_PIE_REGULAR
260 Add -fPIC to CFLAGS and -specs=hardened-build-ld to LDFLAGS.
261 This enables package build as Position Independent Executables (PIE)
262 to protect against "return-to-text" attacks. This belongs to the
263 feature of Address Space Layout Randomisation (ASLR), which is
264 implemented by the kernel and the ELF loader by randomising the
265 location of memory allocations. This makes memory addresses harder
266 to predict when an attacker is attempting a memory-corruption exploit.
267 You can disable this per package by adding PKG_ASLR_PIE:=0 in the package
269 Be ware that ASLR increases the binary size.
270 config PKG_ASLR_PIE_NONE
273 PIE is deactivated for all applications
274 config PKG_ASLR_PIE_REGULAR
277 PIE is activated for some binaries, mostly network exposed applications
278 config PKG_ASLR_PIE_ALL
280 select BUSYBOX_DEFAULT_PIE
282 PIE is activated for all applications
286 prompt "User space Stack-Smashing Protection"
287 default PKG_CC_STACKPROTECTOR_REGULAR
289 Enable GCC Stack Smashing Protection (SSP) for userspace applications
290 config PKG_CC_STACKPROTECTOR_NONE
292 config PKG_CC_STACKPROTECTOR_REGULAR
294 config PKG_CC_STACKPROTECTOR_STRONG
299 prompt "Kernel space Stack-Smashing Protection"
300 default KERNEL_CC_STACKPROTECTOR_REGULAR
302 Enable GCC Stack-Smashing Protection (SSP) for the kernel
303 config KERNEL_CC_STACKPROTECTOR_NONE
305 config KERNEL_CC_STACKPROTECTOR_REGULAR
307 config KERNEL_CC_STACKPROTECTOR_STRONG
311 config KERNEL_STACKPROTECTOR
313 default KERNEL_CC_STACKPROTECTOR_REGULAR || KERNEL_CC_STACKPROTECTOR_STRONG
315 config KERNEL_STACKPROTECTOR_STRONG
317 default KERNEL_CC_STACKPROTECTOR_STRONG
320 prompt "Enable buffer-overflows detection (FORTIFY_SOURCE)"
321 default PKG_FORTIFY_SOURCE_1
323 Enable the _FORTIFY_SOURCE macro which introduces additional
324 checks to detect buffer-overflows in the following standard library
325 functions: memcpy, mempcpy, memmove, memset, strcpy, stpcpy,
326 strncpy, strcat, strncat, sprintf, vsprintf, snprintf, vsnprintf,
327 gets. "Conservative" (_FORTIFY_SOURCE set to 1) only introduces
328 checks that shouldn't change the behavior of conforming programs,
329 while "aggressive" (_FORTIFY_SOURCES set to 2) some more checking is
330 added, but some conforming programs might fail.
331 config PKG_FORTIFY_SOURCE_NONE
333 config PKG_FORTIFY_SOURCE_1
335 config PKG_FORTIFY_SOURCE_2
340 prompt "Enable RELRO protection"
341 default PKG_RELRO_FULL
343 Enable a link-time protection known as RELRO (Relocation Read Only)
344 which helps to protect from certain type of exploitation techniques
345 altering the content of some ELF sections. "Partial" RELRO makes the
346 .dynamic section not writeable after initialization, introducing
347 almost no performance penalty, while "full" RELRO also marks the GOT
348 as read-only at the cost of initializing all of it at startup.
349 config PKG_RELRO_NONE
351 config PKG_RELRO_PARTIAL
353 config PKG_RELRO_FULL
357 config TARGET_ROOTFS_SECURITY_LABELS
359 select KERNEL_SQUASHFS_XATTR
360 select KERNEL_EXT4_FS_SECURITY
361 select KERNEL_F2FS_FS_SECURITY
362 select KERNEL_UBIFS_FS_SECURITY
363 select KERNEL_JFFS2_FS_SECURITY
366 bool "Enable SELinux"
367 select KERNEL_SECURITY_SELINUX
368 select TARGET_ROOTFS_SECURITY_LABELS
369 select PACKAGE_procd-selinux
370 select PACKAGE_busybox-selinux
372 This option enables SELinux kernel features, applies security labels
373 in squashfs rootfs and selects the selinux-variants of busybox and procd.
375 Selecting this option results in about 0.5MiB of additional flash space
376 usage accounting for increased kernel and rootfs size.
379 prompt "default SELinux type"
380 depends on TARGET_ROOTFS_SECURITY_LABELS
381 default SELINUXTYPE_dssp
383 Select SELinux policy to be installed and used for applying rootfs labels.
385 config SELINUXTYPE_targeted
387 select PACKAGE_refpolicy
389 SELinux Reference Policy (refpolicy)
391 config SELINUXTYPE_dssp
393 select PACKAGE_selinux-policy
395 Defensec SELinux Security Policy -- OpenWrt edition
400 bool "Enable SECCOMP"
401 select KERNEL_SECCOMP
402 select PACKAGE_procd-seccomp
403 depends on (aarch64 || arm || armeb || mips || mipsel || mips64 || mips64el || i386 || powerpc || x86_64)
404 depends on !TARGET_uml
407 This option enables seccomp kernel features to safely
408 execute untrusted bytecode and selects the seccomp-variants