491f3fc048
Introduce configuration options to build an "hardened" OpenWRT. Options to enable Stack-Smashing Protection, FORTIFY_SOURCE and RELRO have been introduced. uClibc makefile now automatically detects if SSP support is necessary. hostapd makefile has been fixed to use "^" as sed separator since using a comma was problematic when using "-Wl,-z,now" and the like in TARGET_CFLAGS. Currently enabling SSP on user space depends on enabling SSP kernel side, this is due to the fact that TARGET_CFLAGS are used to build kernel modules (at least). Suggestions on how to avoid this are welcome. Using "select" instead of "depends on" doesn't seem to work with choice entries. Tested with a lantiq (WBMR) router, GCC 4.8, uClibc and a subset of the available packages. Needs to be tested with GCC 4.9 and the remaining packages. PIE not currently included. Signed-off-by: Alessandro Di Federico <ale+owrt@clearmind.me> SVN-Revision: 44005
289 lines
8.5 KiB
Text
289 lines
8.5 KiB
Text
# Copyright (C) 2006-2013 OpenWrt.org
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#
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# This is free software, licensed under the GNU General Public License v2.
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# See /LICENSE for more information.
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#
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menu "Global build settings"
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config ALL
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bool "Select all packages by default"
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default n
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comment "General build options"
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config DISPLAY_SUPPORT
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bool "Show packages that require graphics support (local or remote)"
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default n
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config BUILD_PATENTED
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default y
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bool "Compile with support for patented functionality"
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help
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When this option is disabled, software which provides patented functionality
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will not be built. In case software provides optional support for patented
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functionality, this optional support will get disabled for this package.
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config BUILD_NLS
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default n
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bool "Compile with full language support"
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help
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When this option is enabled, packages are built with the full versions of
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iconv and GNU gettext instead of the default OpenWrt stubs. If uClibc is
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used, it is also built with locale support.
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config BUILD_STATIC_TOOLS
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default n
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bool "Attempt to link host utilities statically"
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help
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Linking host utilities like sed or firmware-utils statically increases the
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portability of the generated ImageBuilder and SDK tarballs; however, it may
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fail on some Linux distributions.
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config SHADOW_PASSWORDS
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bool
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prompt "Enable shadow password support"
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default y
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help
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Enable shadow password support.
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config CLEAN_IPKG
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bool
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prompt "Remove ipkg/opkg status data files in final images"
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default n
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help
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This removes all ipkg/opkg status data files from the target directory
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before building the root filesystem.
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config COLLECT_KERNEL_DEBUG
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bool
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prompt "Collect kernel debug information"
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select KERNEL_DEBUG_INFO
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default n
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help
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This collects debugging symbols from the kernel and all compiled modules.
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Useful for release builds, so that kernel issues can be debugged offline
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later.
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comment "Kernel build options"
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source "config/Config-kernel.in"
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comment "Package build options"
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config DEBUG
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bool
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prompt "Compile packages with debugging info"
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default n
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help
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Adds -g3 to the CFLAGS.
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config IPV6
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bool
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prompt "Enable IPv6 support in packages"
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default y
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help
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Enable IPv6 support in packages (passes --enable-ipv6 to configure scripts).
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config PKG_BUILD_PARALLEL
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bool
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prompt "Compile certain packages parallelized"
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default y
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help
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This adds a -jX option to certain packages that are known to behave well
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for parallel build. By default, the package make processes use the main
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jobserver, in which case this option only takes effect when you add -jX
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to the make command.
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If you are unsure, select N.
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config PKG_BUILD_USE_JOBSERVER
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bool
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prompt "Use top-level make jobserver for packages"
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depends on PKG_BUILD_PARALLEL
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default y
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help
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This passes the main make process jobserver fds to package builds,
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enabling full parallelization across different packages.
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Note that disabling this may overcommit CPU resources depending on the
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-j level of the main make process, the number of package submake jobs
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selected below and the number of actual CPUs present.
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Example: If the main make is passed a -j4 and the submake -j
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is also set to 4, we may end up with 16 parallel make processes
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in the worst case.
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config PKG_BUILD_JOBS
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int
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prompt "Number of package submake jobs (2-512)"
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range 2 512
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default 2
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depends on PKG_BUILD_PARALLEL && !PKG_BUILD_USE_JOBSERVER
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help
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The number of jobs (-jX) to pass to packages submake.
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config PKG_DEFAULT_PARALLEL
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bool
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prompt "Parallelize the default package build rule (May break build)"
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depends on PKG_BUILD_PARALLEL
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depends on BROKEN
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default n
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help
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Always set the default package build rules to parallel build.
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WARNING: This may break build or kill your cat, as it builds packages
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with multiple jobs that are probably not tested in a parallel build
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environment.
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Only say Y if you don't mind fixing broken packages. Before reporting
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build bugs, set this to N and re-run the build.
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comment "Stripping options"
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choice
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prompt "Binary stripping method"
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default USE_STRIP if EXTERNAL_TOOLCHAIN
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default USE_STRIP if USE_GLIBC || USE_EGLIBC || USE_MUSL
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default USE_SSTRIP
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help
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Select the binary stripping method you wish to use.
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config NO_STRIP
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bool "none"
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help
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This will install unstripped binaries (useful for native
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compiling/debugging).
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config USE_STRIP
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bool "strip"
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help
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This will install binaries stripped using strip from binutils.
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config USE_SSTRIP
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bool "sstrip"
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depends on !DEBUG
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depends on !USE_GLIBC
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depends on !USE_EGLIBC
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help
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This will install binaries stripped using sstrip.
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endchoice
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config STRIP_ARGS
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string
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prompt "Strip arguments"
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depends on USE_STRIP
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default "--strip-unneeded --remove-section=.comment --remove-section=.note" if DEBUG
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default "--strip-all"
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help
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Specifies arguments passed to the strip command when stripping binaries.
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config STRIP_KERNEL_EXPORTS
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bool "Strip unnecessary exports from the kernel image"
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help
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Reduces kernel size by stripping unused kernel exports from the kernel
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image. Note that this might make the kernel incompatible with any kernel
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modules that were not selected at the time the kernel image was created.
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config USE_MKLIBS
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bool "Strip unnecessary functions from libraries"
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help
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Reduces libraries to only those functions that are necessary for using all
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selected packages (including those selected as <M>). Note that this will
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make the system libraries incompatible with most of the packages that are
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not selected during the build process.
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choice
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prompt "Preferred standard C++ library"
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default USE_LIBSTDCXX if USE_EGLIBC
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default USE_UCLIBCXX
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help
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Select the preferred standard C++ library for all packages that support this.
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config USE_UCLIBCXX
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bool "uClibc++"
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config USE_LIBSTDCXX
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bool "libstdc++"
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endchoice
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comment "Hardening build options"
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config PKG_CHECK_FORMAT_SECURITY
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bool
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prompt "Enable gcc format-security"
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default n
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help
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Add -Wformat -Werror=format-security to the CFLAGS. You can disable
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this per package by adding PKG_CHECK_FORMAT_SECURITY:=0 in the package
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Makefile.
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choice
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prompt "User space Stack-Smashing Protection"
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default PKG_CC_STACKPROTECTOR_NONE
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help
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Enable GCC Stack Smashing Protection (SSP) for userspace applications
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config PKG_CC_STACKPROTECTOR_NONE
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bool "None"
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config PKG_CC_STACKPROTECTOR_REGULAR
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bool "Regular"
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select SSP_SUPPORT
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depends on KERNEL_CC_STACKPROTECTOR_REGULAR
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config PKG_CC_STACKPROTECTOR_STRONG
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bool "Strong"
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select SSP_SUPPORT
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depends on GCC_VERSION_4_9_LINARO
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depends on KERNEL_CC_STACKPROTECTOR_STRONG
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endchoice
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choice
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prompt "Kernel space Stack-Smashing Protection"
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default KERNEL_CC_STACKPROTECTOR_NONE
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help
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Enable GCC Stack-Smashing Protection (SSP) for the kernel
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config KERNEL_CC_STACKPROTECTOR_NONE
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bool "None"
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config KERNEL_CC_STACKPROTECTOR_REGULAR
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bool "Regular"
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config KERNEL_CC_STACKPROTECTOR_STRONG
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depends on GCC_VERSION_4_9_LINARO
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bool "Strong"
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endchoice
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choice
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prompt "Enable buffer-overflows detction (FORTIFY_SOURCE)"
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help
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Enable the _FORTIFY_SOURCE macro which introduces additional
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checks to detect buffer-overflows in the following standard library
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functions: memcpy, mempcpy, memmove, memset, strcpy, stpcpy,
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strncpy, strcat, strncat, sprintf, vsprintf, snprintf, vsnprintf,
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gets. "Conservative" (_FORTIFY_SOURCE set to 1) only introduces
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checks that sholdn't change the behavior of conforming programs,
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while "aggressive" (_FORTIFY_SOURCES set to 2) some more checking is
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added, but some conforming programs might fail.
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config PKG_FORTIFY_SOURCE_NONE
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bool "None"
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config PKG_FORTIFY_SOURCE_1
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bool "Conservative"
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config PKG_FORTIFY_SOURCE_2
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bool "Aggressive"
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endchoice
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choice
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prompt "Enable RELRO protection"
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help
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Enable a link-time protection know as RELRO (Relocation Read Only)
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which helps to protect from certain type of exploitation techniques
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altering the content of some ELF sections. "Partial" RELRO makes the
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.dynamic section not writeable after initialization, introducing
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almost no performance penalty, while "full" RELRO also marks the GOT
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as read-only at the cost of initializing all of it at startup.
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config PKG_RELRO_NONE
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bool "None"
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config PKG_RELRO_PARTIAL
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bool "Partial"
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config PKG_RELRO_FULL
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bool "Full"
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endchoice
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endmenu
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