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"
72 bool "Use APK instead of OPKG to build distribution (EXPERIMENTAL)"
74 comment "General build options"
77 bool "Use the testing kernel version"
78 depends on HAS_TESTING_KERNEL
81 If the target supports a newer kernel version than the default,
82 you can use this config option to enable it
85 config DISPLAY_SUPPORT
86 bool "Show packages that require graphics support (local or remote)"
89 bool "Compile with support for patented functionality"
91 When this option is disabled, software which provides patented functionality
92 will not be built. In case software provides optional support for patented
93 functionality, this optional support will get disabled for this package.
96 bool "Compile with full language support"
98 When this option is enabled, packages are built with the full versions of
99 iconv and GNU gettext instead of the default OpenWrt stubs. If uClibc is
100 used, it is also built with locale support.
102 config SHADOW_PASSWORDS
108 prompt "Remove ipkg/opkg status data files in final images"
110 This removes all ipkg/opkg status data files from the target directory
111 before building the root filesystem.
113 config IPK_FILES_CHECKSUMS
115 prompt "Record files checksums in package metadata"
117 This makes file checksums part of package metadata. It increases size
118 but provides you with pkg_check command to check for flash corruptions.
120 config INCLUDE_CONFIG
121 bool "Include build configuration in firmware" if DEVEL
123 If enabled, buildinfo files will be stored in /etc/build.* of firmware.
125 config REPRODUCIBLE_DEBUG_INFO
126 bool "Make debug information reproducible"
129 This strips the local build path out of debug information. This has the
130 advantage of making it reproducible, but the disadvantage of making local
131 debugging using ./scripts/remote-gdb harder, since the debug data will
132 no longer point to the full path on the build host.
134 config COLLECT_KERNEL_DEBUG
136 prompt "Collect kernel debug information"
137 select KERNEL_DEBUG_INFO
140 This collects debugging symbols from the kernel and all compiled modules.
141 Useful for release builds, so that kernel issues can be debugged offline
144 menu "Kernel build options"
146 source "config/Config-kernel.in"
150 comment "Package build options"
154 prompt "Compile packages with debugging info"
156 Adds -g3 to the CFLAGS.
158 config USE_GC_SECTIONS
160 prompt "Dead code and data elimination for all packages (EXPERIMENTAL)"
162 Places functions and data items into its own sections to use the linker's
163 garbage collection capabilites.
164 Packages can choose to opt-out via setting PKG_BUILD_FLAGS:=no-gc-sections
168 prompt "Use the link-time optimizer for all packages (EXPERIMENTAL)"
170 Adds LTO flags to the CFLAGS and LDFLAGS.
171 Packages can choose to opt-out via setting PKG_BUILD_FLAGS:=no-lto
174 depends on (aarch64 || arm || i386 || i686 || m68k || powerpc || powerpc64 || sh4 || x86_64)
175 depends on !GCC_USE_VERSION_11
176 def_bool $(shell, ./config/check-hostcxx.sh 10 2 12)
180 prompt "Use the mold linker for all packages"
183 Link packages with mold, a modern linker
184 Packages can opt-out via setting PKG_BUILD_FLAGS:=no-mold
189 comment "Stripping options"
192 prompt "Binary stripping method"
193 default USE_STRIP if USE_GLIBC
196 Select the binary stripping method you wish to use.
201 This will install unstripped binaries (useful for native
202 compiling/debugging).
207 This will install binaries stripped using strip from binutils.
211 depends on !USE_GLIBC
213 This will install binaries stripped using sstrip.
218 prompt "Strip arguments"
220 default "--strip-unneeded --remove-section=.comment --remove-section=.note" if DEBUG
221 default "--strip-all"
223 Specifies arguments passed to the strip command when stripping binaries.
225 config SSTRIP_DISCARD_TRAILING_ZEROES
226 bool "Strip trailing zero bytes"
227 depends on USE_SSTRIP && !USE_MOLD
230 Use sstrip's -z option to discard trailing zero bytes
232 config STRIP_KERNEL_EXPORTS
233 bool "Strip unnecessary exports from the kernel image"
234 depends on !LINUX_6_6
236 Reduces kernel size by stripping unused kernel exports from the kernel
237 image. Note that this might make the kernel incompatible with any kernel
238 modules that were not selected at the time the kernel image was created.
241 bool "Strip unnecessary functions from libraries"
243 Reduces libraries to only those functions that are necessary for using all
244 selected packages (including those selected as <M>). Note that this will
245 make the system libraries incompatible with most of the packages that are
246 not selected during the build process.
248 comment "Hardening build options"
250 config PKG_CHECK_FORMAT_SECURITY
252 prompt "Enable gcc format-security"
255 Add -Wformat -Werror=format-security to the CFLAGS. You can disable
256 this per package by adding PKG_CHECK_FORMAT_SECURITY:=0 in the package
260 prompt "User space ASLR PIE compilation"
261 default PKG_ASLR_PIE_NONE if ((SMALL_FLASH || LOW_MEMORY_FOOTPRINT) && !SDK)
262 default PKG_ASLR_PIE_REGULAR
264 Add -fPIC to CFLAGS and -specs=hardened-build-ld to LDFLAGS.
265 This enables package build as Position Independent Executables (PIE)
266 to protect against "return-to-text" attacks. This belongs to the
267 feature of Address Space Layout Randomisation (ASLR), which is
268 implemented by the kernel and the ELF loader by randomising the
269 location of memory allocations. This makes memory addresses harder
270 to predict when an attacker is attempting a memory-corruption exploit.
271 You can disable this per package by adding PKG_ASLR_PIE:=0 in the package
273 Be ware that ASLR increases the binary size.
274 config PKG_ASLR_PIE_NONE
277 PIE is deactivated for all applications
278 config PKG_ASLR_PIE_REGULAR
281 PIE is activated for some binaries, mostly network exposed applications
282 config PKG_ASLR_PIE_ALL
284 select BUSYBOX_DEFAULT_PIE
286 PIE is activated for all applications
290 prompt "User space Stack-Smashing Protection"
291 default PKG_CC_STACKPROTECTOR_REGULAR
293 Enable GCC Stack Smashing Protection (SSP) for userspace applications
294 config PKG_CC_STACKPROTECTOR_NONE
296 config PKG_CC_STACKPROTECTOR_REGULAR
298 config PKG_CC_STACKPROTECTOR_STRONG
300 config PKG_CC_STACKPROTECTOR_ALL
305 prompt "Kernel space Stack-Smashing Protection"
306 default KERNEL_CC_STACKPROTECTOR_REGULAR
308 Enable GCC Stack-Smashing Protection (SSP) for the kernel
309 config KERNEL_CC_STACKPROTECTOR_NONE
311 config KERNEL_CC_STACKPROTECTOR_REGULAR
313 config KERNEL_CC_STACKPROTECTOR_STRONG
317 config KERNEL_STACKPROTECTOR
319 default KERNEL_CC_STACKPROTECTOR_REGULAR || KERNEL_CC_STACKPROTECTOR_STRONG
321 config KERNEL_STACKPROTECTOR_STRONG
323 default KERNEL_CC_STACKPROTECTOR_STRONG
326 prompt "Enable buffer-overflows detection (FORTIFY_SOURCE)"
327 default PKG_FORTIFY_SOURCE_1
329 Enable the _FORTIFY_SOURCE macro which introduces additional
330 checks to detect buffer-overflows in the following standard library
331 functions: memcpy, mempcpy, memmove, memset, strcpy, stpcpy,
332 strncpy, strcat, strncat, sprintf, vsprintf, snprintf, vsnprintf,
333 gets. "Conservative" (_FORTIFY_SOURCE set to 1) only introduces
334 checks that shouldn't change the behavior of conforming programs,
335 while "aggressive" (_FORTIFY_SOURCES set to 2) some more checking is
336 added, but some conforming programs might fail.
337 config PKG_FORTIFY_SOURCE_NONE
339 config PKG_FORTIFY_SOURCE_1
341 config PKG_FORTIFY_SOURCE_2
346 prompt "Enable RELRO protection"
347 default PKG_RELRO_FULL
349 Enable a link-time protection known as RELRO (Relocation Read Only)
350 which helps to protect from certain type of exploitation techniques
351 altering the content of some ELF sections. "Partial" RELRO makes the
352 .dynamic section not writeable after initialization, introducing
353 almost no performance penalty, while "full" RELRO also marks the GOT
354 as read-only at the cost of initializing all of it at startup.
355 config PKG_RELRO_NONE
357 config PKG_RELRO_PARTIAL
359 config PKG_RELRO_FULL
363 config TARGET_ROOTFS_SECURITY_LABELS
365 select KERNEL_SQUASHFS_XATTR
366 select KERNEL_EXT4_FS_SECURITY
367 select KERNEL_F2FS_FS_SECURITY
368 select KERNEL_UBIFS_FS_SECURITY
369 select KERNEL_JFFS2_FS_SECURITY
372 bool "Enable SELinux"
373 select KERNEL_SECURITY_SELINUX
374 select TARGET_ROOTFS_SECURITY_LABELS
375 select PACKAGE_procd-selinux
376 select PACKAGE_busybox-selinux
378 This option enables SELinux kernel features, applies security labels
379 in squashfs rootfs and selects the selinux-variants of busybox and procd.
381 Selecting this option results in about 0.5MiB of additional flash space
382 usage accounting for increased kernel and rootfs size.
385 prompt "default SELinux type"
386 depends on TARGET_ROOTFS_SECURITY_LABELS
387 default SELINUXTYPE_dssp
389 Select SELinux policy to be installed and used for applying rootfs labels.
391 config SELINUXTYPE_targeted
393 select PACKAGE_refpolicy
395 SELinux Reference Policy (refpolicy)
397 config SELINUXTYPE_dssp
399 select PACKAGE_selinux-policy
401 Defensec SELinux Security Policy -- OpenWrt edition
406 bool "Enable SECCOMP"
407 select KERNEL_SECCOMP
408 select PACKAGE_procd-seccomp
409 depends on (aarch64 || arm || armeb || mips || mipsel || mips64 || mips64el || i386 || powerpc || x86_64)
410 depends on !TARGET_uml
413 This option enables seccomp kernel features to safely
414 execute untrusted bytecode and selects the seccomp-variants