1# 2# For a description of the syntax of this configuration file, 3# see docs/Kconfig-language.txt. 4# 5 6mainmenu "Configuration" 7 8config HAVE_DOT_CONFIG 9 bool 10 default y 11 12menu "Settings" 13 14config DESKTOP 15 bool "Enable compatibility for full-blown desktop systems (8kb)" 16 default y 17 help 18 Enable applet options and features which are not essential. 19 Many applet options have dedicated config options to (de)select them 20 under that applet; this options enables those options which have no 21 individual config item for them. 22 23 Select this if you plan to use busybox on full-blown desktop machine 24 with common Linux distro, which needs higher level of command-line 25 compatibility. 26 27 If you are preparing your build to be used on an embedded box 28 where you have tighter control over the entire set of userspace 29 tools, you can unselect this option for smaller code size. 30 31config EXTRA_COMPAT 32 bool "Provide compatible behavior for rare corner cases (bigger code)" 33 default n 34 help 35 This option makes grep, sed etc handle rare corner cases 36 (embedded NUL bytes and such). This makes code bigger and uses 37 some GNU extensions in libc. You probably only need this option 38 if you plan to run busybox on desktop. 39 40config FEDORA_COMPAT 41 bool "Building for Fedora distribution" 42 default n 43 help 44 This option makes some tools behave like they do on Fedora. 45 46 At the time of this writing (2017-08) this only affects uname: 47 normally, uname -p (processor) and uname -i (platform) 48 are shown as "unknown", but with this option uname -p 49 shows the same string as uname -m (machine type), 50 and so does uname -i unless machine type is i486/i586/i686 - 51 then uname -i shows "i386". 52 53config INCLUDE_SUSv2 54 bool "Enable obsolete features removed before SUSv3" 55 default y 56 help 57 This option will enable backwards compatibility with SuSv2, 58 specifically, old-style numeric options ('command -1 <file>') 59 will be supported in head, tail, and fold. (Note: should 60 affect renice too.) 61 62config LONG_OPTS 63 bool "Support --long-options" 64 default y 65 help 66 Enable this if you want busybox applets to use the gnu --long-option 67 style, in addition to single character -a -b -c style options. 68 69config SHOW_USAGE 70 bool "Show applet usage messages" 71 default y 72 help 73 Enabling this option, applets will show terse help messages 74 when invoked with wrong arguments. 75 If you do not want to show any (helpful) usage message when 76 issuing wrong command syntax, you can say 'N' here, 77 saving approximately 7k. 78 79config FEATURE_VERBOSE_USAGE 80 bool "Show verbose applet usage messages" 81 default y 82 depends on SHOW_USAGE 83 help 84 All applets will show verbose help messages when invoked with --help. 85 This will add a lot of text to the binary. 86 87config FEATURE_COMPRESS_USAGE 88 bool "Store applet usage messages in compressed form" 89 default y 90 depends on SHOW_USAGE 91 help 92 Store usage messages in .bz2 compressed form, uncompress them 93 on-the-fly when "APPLET --help" is run. 94 95 If you have a really tiny busybox with few applets enabled (and 96 bunzip2 isn't one of them), the overhead of the decompressor might 97 be noticeable. Also, if you run executables directly from ROM 98 and have very little memory, this might not be a win. Otherwise, 99 you probably want this. 100 101config LFS 102 bool "Support files > 2 GB" 103 default y 104 help 105 If you need to work with large files, enable this option. 106 This will have no effect if your kernel or your C 107 library lacks large file support for large files. Some of the 108 programs that can benefit from large file support include dd, gzip, 109 cp, mount, tar. 110 111config PAM 112 bool "Support PAM (Pluggable Authentication Modules)" 113 default n 114 help 115 Use PAM in some applets (currently login and httpd) instead 116 of direct access to password database. 117 118config FEATURE_DEVPTS 119 bool "Use the devpts filesystem for Unix98 PTYs" 120 default y 121 help 122 Enable if you want to use Unix98 PTY support. If enabled, 123 busybox will use /dev/ptmx for the master side of the pseudoterminal 124 and /dev/pts/<number> for the slave side. Otherwise, BSD style 125 /dev/ttyp<number> will be used. To use this option, you should have 126 devpts mounted. 127 128config FEATURE_UTMP 129 bool "Support utmp file" 130 default y 131 help 132 The file /var/run/utmp is used to track who is currently logged in. 133 With this option on, certain applets (getty, login, telnetd etc) 134 will create and delete entries there. 135 "who" applet requires this option. 136 137config FEATURE_WTMP 138 bool "Support wtmp file" 139 default y 140 depends on FEATURE_UTMP 141 help 142 The file /var/run/wtmp is used to track when users have logged into 143 and logged out of the system. 144 With this option on, certain applets (getty, login, telnetd etc) 145 will append new entries there. 146 "last" applet requires this option. 147 148config FEATURE_PIDFILE 149 bool "Support writing pidfiles" 150 default y 151 help 152 This option makes some applets (e.g. crond, syslogd, inetd) write 153 a pidfile at the configured PID_FILE_PATH. It has no effect 154 on applets which require pidfiles to run. 155 156config PID_FILE_PATH 157 string "Directory for pidfiles" 158 default "/var/run" 159 depends on FEATURE_PIDFILE 160 help 161 This is the default path where pidfiles are created. Applets which 162 allow you to set the pidfile path on the command line will override 163 this value. The option has no effect on applets that require you to 164 specify a pidfile path. 165 166config BUSYBOX 167 bool "Include busybox applet" 168 default y 169 help 170 The busybox applet provides general help message and allows 171 the included applets to be listed. It also provides 172 optional --install command to create applet links. If you unselect 173 this option, running busybox without any arguments will give 174 just a cryptic error message: 175 176 $ busybox 177 busybox: applet not found 178 179 Running "busybox APPLET [ARGS...]" will still work, of course. 180 181config FEATURE_SHOW_SCRIPT 182 bool "Support --show SCRIPT" 183 default y 184 depends on BUSYBOX 185 186config FEATURE_INSTALLER 187 bool "Support --install [-s] to install applet links at runtime" 188 default y 189 depends on BUSYBOX 190 help 191 Enable 'busybox --install [-s]' support. This will allow you to use 192 busybox at runtime to create hard links or symlinks for all the 193 applets that are compiled into busybox. 194 195config INSTALL_NO_USR 196 bool "Don't use /usr" 197 default n 198 help 199 Disable use of /usr. "busybox --install" and "make install" 200 will install applets only to /bin and /sbin, 201 never to /usr/bin or /usr/sbin. 202 203config FEATURE_SUID 204 bool "Drop SUID state for most applets" 205 default y 206 help 207 With this option you can install the busybox binary belonging 208 to root with the suid bit set, enabling some applets to perform 209 root-level operations even when run by ordinary users 210 (for example, mounting of user mounts in fstab needs this). 211 212 With this option enabled, busybox drops privileges for applets 213 that don't need root access, before entering their main() function. 214 215 If you are really paranoid and don't want even initial busybox code 216 to run under root for every applet, build two busybox binaries with 217 different applets in them (and the appropriate symlinks pointing 218 to each binary), and only set the suid bit on the one that needs it. 219 220 Some applets which require root rights (need suid bit on the binary 221 or to be run by root) and will refuse to execute otherwise: 222 crontab, login, passwd, su, vlock, wall. 223 224 The applets which will use root rights if they have them 225 (via suid bit, or because run by root), but would try to work 226 without root right nevertheless: 227 findfs, ping[6], traceroute[6], mount. 228 229 Note that if you DO NOT select this option, but DO make busybox 230 suid root, ALL applets will run under root, which is a huge 231 security hole (think "cp /some/file /etc/passwd"). 232 233config FEATURE_SUID_CONFIG 234 bool "Enable SUID configuration via /etc/busybox.conf" 235 default y 236 depends on FEATURE_SUID 237 help 238 Allow the SUID/SGID state of an applet to be determined at runtime 239 by checking /etc/busybox.conf. (This is sort of a poor man's sudo.) 240 The format of this file is as follows: 241 242 APPLET = [Ssx-][Ssx-][x-] [USER.GROUP] 243 244 s: USER or GROUP is allowed to execute APPLET. 245 APPLET will run under USER or GROUP 246 (regardless of who's running it). 247 S: USER or GROUP is NOT allowed to execute APPLET. 248 APPLET will run under USER or GROUP. 249 This option is not very sensical. 250 x: USER/GROUP/others are allowed to execute APPLET. 251 No UID/GID change will be done when it is run. 252 -: USER/GROUP/others are not allowed to execute APPLET. 253 254 An example might help: 255 256 |[SUID] 257 |su = ssx root.0 # applet su can be run by anyone and runs with 258 | # euid=0,egid=0 259 |su = ssx # exactly the same 260 | 261 |mount = sx- root.disk # applet mount can be run by root and members 262 | # of group disk (but not anyone else) 263 | # and runs with euid=0 (egid is not changed) 264 | 265 |cp = --- # disable applet cp for everyone 266 267 The file has to be owned by user root, group root and has to be 268 writeable only by root: 269 (chown 0.0 /etc/busybox.conf; chmod 600 /etc/busybox.conf) 270 The busybox executable has to be owned by user root, group 271 root and has to be setuid root for this to work: 272 (chown 0.0 /bin/busybox; chmod 4755 /bin/busybox) 273 274 Robert 'sandman' Griebl has more information here: 275 <url: http://www.softforge.de/bb/suid.html >. 276 277config FEATURE_SUID_CONFIG_QUIET 278 bool "Suppress warning message if /etc/busybox.conf is not readable" 279 default y 280 depends on FEATURE_SUID_CONFIG 281 help 282 /etc/busybox.conf should be readable by the user needing the SUID, 283 check this option to avoid users to be notified about missing 284 permissions. 285 286config FEATURE_PREFER_APPLETS 287 bool "exec prefers applets" 288 default n 289 help 290 This is an experimental option which directs applets about to 291 call 'exec' to try and find an applicable busybox applet before 292 searching the PATH. This is typically done by exec'ing 293 /proc/self/exe. 294 295 This may affect shell, find -exec, xargs and similar applets. 296 They will use applets even if /bin/APPLET -> busybox link 297 is missing (or is not a link to busybox). However, this causes 298 problems in chroot jails without mounted /proc and with ps/top 299 (command name can be shown as 'exe' for applets started this way). 300 301config BUSYBOX_EXEC_PATH 302 string "Path to busybox executable" 303 default "/proc/self/exe" 304 help 305 When applets need to run other applets, busybox 306 sometimes needs to exec() itself. When the /proc filesystem is 307 mounted, /proc/self/exe always points to the currently running 308 executable. If you haven't got /proc, set this to wherever you 309 want to run busybox from. 310 311config SELINUX 312 bool "Support NSA Security Enhanced Linux" 313 default n 314 select PLATFORM_LINUX 315 help 316 Enable support for SELinux in applets ls, ps, and id. Also provide 317 the option of compiling in SELinux applets. 318 319 If you do not have a complete SELinux userland installed, this stuff 320 will not compile. Specifially, libselinux 1.28 or better is 321 directly required by busybox. If the installation is located in a 322 non-standard directory, provide it by invoking make as follows: 323 324 CFLAGS=-I<libselinux-include-path> \ 325 LDFLAGS=-L<libselinux-lib-path> \ 326 make 327 328 Most people will leave this set to 'N'. 329 330config FEATURE_CLEAN_UP 331 bool "Clean up all memory before exiting (usually not needed)" 332 default n 333 help 334 As a size optimization, busybox normally exits without explicitly 335 freeing dynamically allocated memory or closing files. This saves 336 space since the OS will clean up for us, but it can confuse debuggers 337 like valgrind, which report tons of memory and resource leaks. 338 339 Don't enable this unless you have a really good reason to clean 340 things up manually. 341 342config FEATURE_SYSLOG_INFO 343 bool "Support LOG_INFO level syslog messages" 344 default y 345 depends on FEATURE_SYSLOG 346 help 347 Applets which send their output to syslog use either LOG_INFO or 348 LOG_ERR log levels, but by disabling this option all messages will 349 be logged at the LOG_ERR level, saving just under 200 bytes. 350 351# These are auto-selected by other options 352 353config FEATURE_SYSLOG 354 bool #No description makes it a hidden option 355 default n 356 #help 357 #This option is auto-selected when you select any applet which may 358 #send its output to syslog. You do not need to select it manually. 359 360config PLATFORM_LINUX 361 bool #No description makes it a hidden option 362 default n 363 #help 364 #For the most part, busybox requires only POSIX compatibility 365 #from the target system, but some applets and features use 366 #Linux-specific interfaces. 367 # 368 #This is automatically selected if any applet or feature requires 369 #Linux-specific interfaces. You do not need to select it manually. 370 371comment 'Build Options' 372 373config STATIC 374 bool "Build static binary (no shared libs)" 375 default n 376 help 377 If you want to build a static binary, which does not use 378 or require any shared libraries, enable this option. 379 Static binaries are larger, but do not require functioning 380 dynamic libraries to be present, which is important if used 381 as a system rescue tool. 382 383config PIE 384 bool "Build position independent executable" 385 default n 386 depends on !STATIC 387 help 388 Hardened code option. PIE binaries are loaded at a different 389 address at each invocation. This has some overhead, 390 particularly on x86-32 which is short on registers. 391 392 Most people will leave this set to 'N'. 393 394config NOMMU 395 bool "Force NOMMU build" 396 default n 397 help 398 Busybox tries to detect whether architecture it is being 399 built against supports MMU or not. If this detection fails, 400 or if you want to build NOMMU version of busybox for testing, 401 you may force NOMMU build here. 402 403 Most people will leave this set to 'N'. 404 405# PIE can be made to work with BUILD_LIBBUSYBOX, but currently 406# build system does not support that 407config BUILD_LIBBUSYBOX 408 bool "Build shared libbusybox" 409 default n 410 depends on !FEATURE_PREFER_APPLETS && !PIE && !STATIC 411 help 412 Build a shared library libbusybox.so.N.N.N which contains all 413 busybox code. 414 415 This feature allows every applet to be built as a really tiny 416 separate executable linked against the library: 417 |$ size 0_lib/l* 418 | text data bss dec hex filename 419 | 939 212 28 1179 49b 0_lib/last 420 | 939 212 28 1179 49b 0_lib/less 421 | 919138 8328 1556 929022 e2cfe 0_lib/libbusybox.so.1.N.M 422 423 This is useful on NOMMU systems which are not capable 424 of sharing executables, but are capable of sharing code 425 in dynamic libraries. 426 427config FEATURE_LIBBUSYBOX_STATIC 428 bool "Pull in all external references into libbusybox" 429 default n 430 depends on BUILD_LIBBUSYBOX 431 help 432 Make libbusybox library independent, not using or requiring 433 any other shared libraries. 434 435config FEATURE_INDIVIDUAL 436 bool "Produce a binary for each applet, linked against libbusybox" 437 default y 438 depends on BUILD_LIBBUSYBOX 439 help 440 If your CPU architecture doesn't allow for sharing text/rodata 441 sections of running binaries, but allows for runtime dynamic 442 libraries, this option will allow you to reduce memory footprint 443 when you have many different applets running at once. 444 445 If your CPU architecture allows for sharing text/rodata, 446 having single binary is more optimal. 447 448 Each applet will be a tiny program, dynamically linked 449 against libbusybox.so.N.N.N. 450 451 You need to have a working dynamic linker. 452 453config FEATURE_SHARED_BUSYBOX 454 bool "Produce additional busybox binary linked against libbusybox" 455 default y 456 depends on BUILD_LIBBUSYBOX 457 help 458 Build busybox, dynamically linked against libbusybox.so.N.N.N. 459 460 You need to have a working dynamic linker. 461 462### config BUILD_AT_ONCE 463### bool "Compile all sources at once" 464### default n 465### help 466### Normally each source-file is compiled with one invocation of 467### the compiler. 468### If you set this option, all sources are compiled at once. 469### This gives the compiler more opportunities to optimize which can 470### result in smaller and/or faster binaries. 471### 472### Setting this option will consume alot of memory, e.g. if you 473### enable all applets with all features, gcc uses more than 300MB 474### RAM during compilation of busybox. 475### 476### This option is most likely only beneficial for newer compilers 477### such as gcc-4.1 and above. 478### 479### Say 'N' unless you know what you are doing. 480 481config CROSS_COMPILER_PREFIX 482 string "Cross compiler prefix" 483 default "" 484 help 485 If you want to build busybox with a cross compiler, then you 486 will need to set this to the cross-compiler prefix, for example, 487 "i386-uclibc-". 488 489 Note that CROSS_COMPILE environment variable or 490 "make CROSS_COMPILE=xxx ..." will override this selection. 491 492 Native builds leave this empty. 493 494config SYSROOT 495 string "Path to sysroot" 496 default "" 497 help 498 If you want to build busybox with a cross compiler, then you 499 might also need to specify where /usr/include and /usr/lib 500 will be found. 501 502 For example, busybox can be built against an installed 503 Android NDK, platform version 9, for ARM ABI with 504 505 CONFIG_SYSROOT=/opt/android-ndk/platforms/android-9/arch-arm 506 507 Native builds leave this empty. 508 509config EXTRA_CFLAGS 510 string "Additional CFLAGS" 511 default "" 512 help 513 Additional CFLAGS to pass to the compiler verbatim. 514 515config EXTRA_LDFLAGS 516 string "Additional LDFLAGS" 517 default "" 518 help 519 Additional LDFLAGS to pass to the linker verbatim. 520 521config EXTRA_LDLIBS 522 string "Additional LDLIBS" 523 default "" 524 help 525 Additional LDLIBS to pass to the linker with -l. 526 527config USE_PORTABLE_CODE 528 bool "Avoid using GCC-specific code constructs" 529 default n 530 help 531 Use this option if you are trying to compile busybox with 532 compiler other than gcc. 533 If you do use gcc, this option may needlessly increase code size. 534 535config STACK_OPTIMIZATION_386 536 bool "Use -mpreferred-stack-boundary=2 on i386 arch" 537 default y 538 help 539 This option makes for smaller code, but some libc versions 540 do not work with it (they use SSE instructions without 541 ensuring stack alignment). 542 543comment 'Installation Options ("make install" behavior)' 544 545choice 546 prompt "What kind of applet links to install" 547 default INSTALL_APPLET_SYMLINKS 548 help 549 Choose what kind of links to applets are created by "make install". 550 551config INSTALL_APPLET_SYMLINKS 552 bool "as soft-links" 553 help 554 Install applets as soft-links to the busybox binary. This needs some 555 free inodes on the filesystem, but might help with filesystem 556 generators that can't cope with hard-links. 557 558config INSTALL_APPLET_HARDLINKS 559 bool "as hard-links" 560 help 561 Install applets as hard-links to the busybox binary. This might 562 count on a filesystem with few inodes. 563 564config INSTALL_APPLET_SCRIPT_WRAPPERS 565 bool "as script wrappers" 566 help 567 Install applets as script wrappers that call the busybox binary. 568 569config INSTALL_APPLET_DONT 570 bool "not installed" 571 help 572 Do not install applet links. Useful when you plan to use 573 busybox --install for installing links, or plan to use 574 a standalone shell and thus don't need applet links. 575 576endchoice 577 578choice 579 prompt "/bin/sh applet link" 580 default INSTALL_SH_APPLET_SYMLINK 581 depends on INSTALL_APPLET_SCRIPT_WRAPPERS 582 help 583 Choose how you install /bin/sh applet link. 584 585config INSTALL_SH_APPLET_SYMLINK 586 bool "as soft-link" 587 help 588 Install /bin/sh applet as soft-link to the busybox binary. 589 590config INSTALL_SH_APPLET_HARDLINK 591 bool "as hard-link" 592 help 593 Install /bin/sh applet as hard-link to the busybox binary. 594 595config INSTALL_SH_APPLET_SCRIPT_WRAPPER 596 bool "as script wrapper" 597 help 598 Install /bin/sh applet as script wrapper that calls 599 the busybox binary. 600 601endchoice 602 603config PREFIX 604 string "Destination path for 'make install'" 605 default "./_install" 606 help 607 Where "make install" should install busybox binary and links. 608 609comment 'Debugging Options' 610 611config DEBUG 612 bool "Build with debug information" 613 default n 614 help 615 Say Y here to compile with debug information. 616 This increases the size of the binary considerably, and 617 should only be used when doing development. 618 619 This adds -g option to gcc command line. 620 621 Most people should answer N. 622 623config DEBUG_PESSIMIZE 624 bool "Disable compiler optimizations" 625 default n 626 depends on DEBUG 627 help 628 The compiler's optimization of source code can eliminate and reorder 629 code, resulting in an executable that's hard to understand when 630 stepping through it with a debugger. This switches it off, resulting 631 in a much bigger executable that more closely matches the source 632 code. 633 634 This replaces -Os/-O2 with -O0 in gcc command line. 635 636config DEBUG_SANITIZE 637 bool "Enable runtime sanitizers (ASAN/LSAN/USAN/etc...)" 638 default n 639 help 640 Say Y here if you want to enable runtime sanitizers. These help 641 catch bad memory accesses (e.g. buffer overflows), but will make 642 the executable larger and slow down runtime a bit. 643 644 This adds -fsanitize=foo options to gcc command line. 645 646 If you aren't developing/testing busybox, say N here. 647 648config UNIT_TEST 649 bool "Build unit tests" 650 default n 651 help 652 Say Y here if you want to build unit tests (both the framework and 653 test cases) as an applet. This results in bigger code, so you 654 probably don't want this option in production builds. 655 656config WERROR 657 bool "Abort compilation on any warning" 658 default n 659 help 660 This adds -Werror to gcc command line. 661 662 Most people should answer N. 663 664choice 665 prompt "Additional debugging library" 666 default NO_DEBUG_LIB 667 help 668 Using an additional debugging library will make busybox become 669 considerably larger and will cause it to run more slowly. You 670 should always leave this option disabled for production use. 671 672 dmalloc support: 673 ---------------- 674 This enables compiling with dmalloc ( http://dmalloc.com/ ) 675 which is an excellent public domain mem leak and malloc problem 676 detector. To enable dmalloc, before running busybox you will 677 want to properly set your environment, for example: 678 export DMALLOC_OPTIONS=debug=0x34f47d83,inter=100,log=logfile 679 The 'debug=' value is generated using the following command 680 dmalloc -p log-stats -p log-non-free -p log-bad-space \ 681 -p log-elapsed-time -p check-fence -p check-heap \ 682 -p check-lists -p check-blank -p check-funcs -p realloc-copy \ 683 -p allow-free-null 684 685 Electric-fence support: 686 ----------------------- 687 This enables compiling with Electric-fence support. Electric 688 fence is another very useful malloc debugging library which uses 689 your computer's virtual memory hardware to detect illegal memory 690 accesses. This support will make busybox be considerably larger 691 and run slower, so you should leave this option disabled unless 692 you are hunting a hard to find memory problem. 693 694 695config NO_DEBUG_LIB 696 bool "None" 697 698config DMALLOC 699 bool "Dmalloc" 700 701config EFENCE 702 bool "Electric-fence" 703 704endchoice 705 706source libbb/Config.in 707 708endmenu 709 710comment "Applets" 711 712source archival/Config.in 713source coreutils/Config.in 714source console-tools/Config.in 715source debianutils/Config.in 716source klibc-utils/Config.in 717source editors/Config.in 718source findutils/Config.in 719source init/Config.in 720source loginutils/Config.in 721source e2fsprogs/Config.in 722source modutils/Config.in 723source util-linux/Config.in 724source miscutils/Config.in 725source networking/Config.in 726source printutils/Config.in 727source mailutils/Config.in 728source procps/Config.in 729source runit/Config.in 730source selinux/Config.in 731source shell/Config.in 732source sysklogd/Config.in 733