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12a4f9afe7
busybox/libbb
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Denys Vlasenko 12a4f9afe7 libbb: do not die if setgid/setuid(real_id) on startup fails 
Based on a patch from Steven McDonald <steven@steven-mcdonald.id.au>:

This makes 'unshare --user' work correctly in the case where the user's
shell is provided by busybox itself.

'unshare --user' creates a new user namespace without any uid mappings.
As a result, /bin/busybox is setuid nobody:nogroup within the
namespace, as that is the only user. However, since no uids are mapped,
attempting to call setgid/setuid fails, even though this would do
nothing:

  $ unshare --user ./busybox.broken ash
  ash: setgid: Invalid argument

'unshare --map-root-user' still works, but because Linux only allows
uid/gid mappings to be set up once, creating a root mapping makes such
a namespace useless for creating multi-user containers.

With this patch, setgid and setuid will not be called in the case where
they would do nothing, which is always the case inside a new user
namespace because all uids are effectively mapped to nobody:

  $ id -u
  1000
  $ ls -lh busybox.fixed
  -rwsr-xr-x    1 root     root      826.2K May 21 00:33 busybox.fixed
  $ unshare --user ./busybox.fixed ash
  $ id -u
  65534

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-07-10 09:17:43 +02:00
..
appletlib.c libbb: do not die if setgid/setuid(real_id) on startup fails 2017-07-10 09:17:43 +02:00
ask_confirmation.c
auto_string.c libbb: auto_string() for efficient handling of temporary malloced stirngs 2015-10-09 17:59:56 +02:00
bb_askpass.c use auto_string() where appropriate to kill a few statics 2015-10-09 18:16:40 +02:00
bb_bswap_64.c
bb_cat.c fix errors found with make_single_applets.sh 2017-04-12 15:48:19 +02:00
bb_do_delay.c
bb_getgroups.c libbb: new function bb_getgroups() - allocating wrapper around getgroups() 2017-07-04 18:56:45 +02:00
bb_pwd.c libpwdgrp: rewritten to use malloced implementation 2015-01-02 21:37:59 +01:00
bb_qsort.c
bb_strtod.c
bb_strtonum.c libbb/bb_strtonum: always set end ptr, even on error return 2011-12-22 13:00:32 +01:00
bbunit.c unit-tests: remove code depending on WANT_TIMING 2015-08-17 17:01:49 +02:00
change_identity.c libbb: Enable support for !CONFIG_MULTIUSER 2015-05-12 23:59:57 +02:00
chomp.c
common_bufsiz.c comment and readme updates 2016-11-04 14:13:58 +01:00
compare_string_array.c libbb: another unit test for is_suffixed_with 2015-09-15 23:38:01 +02:00
concat_path_file.c
concat_subpath_file.c
Config.src Big cleanup in config help and description 2017-01-10 14:58:54 +01:00
copy_file.c cp: fix -i for POSIX mode. Closes 9106 2016-08-13 23:23:48 +02:00
copyfd.c libbb: use sendfile() to copy data between file descriptors 2014-11-27 23:31:58 +01:00
correct_password.c libbb: make check_password() also return CHECKPASS_PW_HAS_EMPTY_PASSWORD 2017-04-13 13:04:05 +02:00
crc32.c Replace int -> uint to avoid signed integer overflow 2017-02-04 23:10:22 +01:00
default_error_retval.c
device_open.c
die_if_bad_username.c
dump.c libbb: shrink sump.c 2017-01-25 16:21:00 +01:00
endofname.c move endofname() to libbb 2013-02-26 00:36:53 +01:00
executable.c su: expand help; simplify passing of -c CMD to run_shell() 2016-11-03 22:13:08 +01:00
fclose_nonstdin.c sed: open input files sequentially to avoid EMFILE 2013-11-28 03:14:16 +01:00
fflush_stdout_and_exit.c remove global "jmp_buf die_jmp" from !FEATURE_PREFER_APPLETS builds 2015-10-09 16:42:57 +02:00
fgets_str.c
find_mount_point.c find_mount_point: fix find_mount_point for char devices 2012-01-18 01:49:11 +01:00
find_pid_by_name.c
find_root_device.c
full_write.c
get_console.c
get_cpu_count.c
get_last_path_component.c
get_line_from_file.c
get_shell_name.c mark get_shell_name FAST_FUNC 2012-10-03 09:42:21 +02:00
get_volsize.c
getopt32.c fixes for bugs found by make_single_applets.sh 2017-07-03 21:31:16 +02:00
getpty.c script: make it work even if fd 0 is closed 2014-03-16 12:34:53 +01:00
hash_md5_sha.c tls: add 2nd cipher_id, TLS_RSA_WITH_AES_128_CBC_SHA, so far it doesn't work 2017-01-24 16:00:54 +01:00
hash_md5prime.c tls: add 2nd cipher_id, TLS_RSA_WITH_AES_128_CBC_SHA, so far it doesn't work 2017-01-24 16:00:54 +01:00
herror_msg.c
human_readable.c du: extra compat: with -k and -m, round sizes up 2015-10-15 21:33:34 +02:00
in_ether.c Removes stray empty line from code 2015-07-13 03:25:46 +02:00
inet_cksum.c
inet_common.c libbb: make INET[6]_rresolve use sockaddr2{host,dotted}_noport 2015-02-03 12:07:40 +01:00
inode_hash.c du, copy_file: fix file matching on cramfs. Closes 5456 2014-02-25 15:27:58 +01:00
isdirectory.c libbb: remove is_directory's argument which is always NULL 2011-12-18 03:27:46 +01:00
isqrt.c libbb: move isqrt from factor, use it in diff too 2017-04-11 07:34:56 +02:00
Kbuild.src login: move check_securetty to libbb 2017-04-13 12:39:03 +02:00
kernel_version.c tidy up strtok use 2015-10-23 18:43:16 +02:00
last_char_is.c
lineedit_ptr_hack.c
lineedit.c libbb: consolidate the code to set termios unbuffered mode 2017-01-11 16:17:59 +01:00
llist.c
logenv.c zcip: Add environment variable for overriding log functionality 2014-11-04 12:19:04 +01:00
login.c libbb: handle \S in /etc/issue 2016-09-24 23:50:43 +02:00
loop.c mount: create loop devices with LO_FLAGS_AUTOCLEAR flag 2017-03-16 16:55:47 +01:00
make_directory.c fix musl problem with dirname, now for all users of bb_make_directory() 2016-12-04 10:42:07 +01:00
makedev.c
match_fstype.c libbb: match_fstype() is unreadable in the extreme, fixing it 2017-01-30 00:45:05 +01:00
messages.c Change BB_EXTRA_VERSION: now it needs to contain any spaces/parenthesis 2017-07-04 16:01:12 +02:00
missing_syscalls.c Resolve linker issues with Android API 21 (dprintf, tcdrain) 2015-12-17 16:42:41 +01:00
mode_string.c *: slap on a few ALIGN1/2s where appropriate 2016-04-22 18:09:21 +02:00
mtab.c
nuke_str.c fix failures found by randomconfig builds 2013-12-31 23:22:36 +01:00
obscure.c unit-tests: implement the unit-testing framework 2014-06-22 16:30:41 +02:00
parse_config.c getopt32: add new syntax of 'o:+' and 'o:*' for -o NUM and -o LIST 2016-07-06 21:58:02 +02:00
parse_mode.c libbb: more compact API for bb_parse_mode() 2015-10-07 17:55:33 +02:00
percent_decode.c wget: URL-decode user:password before base64-encoding it into auth hdr. Closes 3625. 2011-09-11 21:04:02 +02:00
perror_msg.c
perror_nomsg_and_die.c
perror_nomsg.c
pidfile.c
platform.c Bionic lacks ttyname_r; provide a workaround 2015-04-25 21:32:48 +02:00
print_flags.c
print_numbered_lines.c fix errors found with make_single_applets.sh 2017-04-12 15:48:19 +02:00
printable_string.c libbb: auto_string() for efficient handling of temporary malloced stirngs 2015-10-09 17:59:56 +02:00
printable.c Refactor catv. Move visible() from stty to libbb. 2013-07-30 06:29:42 +02:00
process_escape_sequence.c
procps.c ps: avoid -o stat to contain spaces. Closes 9631 2017-02-02 13:04:30 +01:00
progress.c wget: if stderr is not a tty, progress bar shouldn't use tty-tricks 2015-10-23 02:01:38 +02:00
ptr_to_globals.c
pw_encrypt_des.c
pw_encrypt_md5.c fix assorted unused code and wrong format specs found by cppchekc (bug 6716) 2013-11-29 16:43:33 +01:00
pw_encrypt_sha.c tls: add 2nd cipher_id, TLS_RSA_WITH_AES_128_CBC_SHA, so far it doesn't work 2017-01-24 16:00:54 +01:00
pw_encrypt.c Replace int -> uint to avoid signed integer overflow 2017-02-04 23:10:22 +01:00
read_key.c lineedit: fix handling of repeating Alt-b, Alt-f, Alt-d, Alt-Backspace 2016-11-24 15:04:00 +01:00
read_printf.c libbb: remove unnecessary argument to nonblock_immune_read 2015-04-20 13:41:32 +02:00
read.c
README
recursive_action.c modprobe: do not descend into /etc/modprobe.d/DIR/. Closes 8686 2017-04-06 15:23:26 +02:00
remove_file.c Add conditional support for -v / --verbose 2014-05-19 16:23:50 +02:00
replace.c xargs: add support for -I and -i. Closes 493 2014-02-27 11:17:06 +01:00
rtc.c libbb: introduce and use is_prefixed_with() 2015-03-12 17:48:34 +01:00
run_shell.c su: expand help; simplify passing of -c CMD to run_shell() 2016-11-03 22:13:08 +01:00
safe_gethostname.c sendmail: use host rather than NIS domain name for HELO 2012-04-28 17:04:19 +02:00
safe_poll.c
safe_strncpy.c
safe_write.c
securetty.c libbb: fix "error: redefinition of 'is_tty_secure'" 2017-04-13 17:55:05 +02:00
selinux_common.c whitespace cleanup. no code changes 2013-01-14 15:57:44 +01:00
setup_environment.c su: do not change to home dir unless -l 2012-06-12 13:21:02 +02:00
signals.c libbb: correctness/size tweaks in signal-related helpers 2012-09-27 13:20:34 +02:00
simplify_path.c
single_argv.c
skip_whitespace.c libbb: introduce and use is_prefixed_with() 2015-03-12 17:48:34 +01:00
speed_table.c libbb/speed_table.c: expand comments 2016-09-26 14:37:12 +02:00
str_tolower.c
strrstr.c unit-tests: implement the unit-testing framework 2014-06-22 16:30:41 +02:00
sysconf.c libbb: add sanity check in bb_arg_max() 2014-12-24 01:46:29 +01:00
time.c libbb: fix time parsing of [[CC]YY]MMDDhhmm[.SS]. Closes 8951 2016-05-31 02:50:54 +02:00
trim.c
u_signal_names.c *: slap on a few ALIGN1/2s where appropriate 2016-04-22 18:09:21 +02:00
ubi.c whitespace and namespace cleanups 2016-04-03 22:24:51 +02:00
udp_io.c libbb:/send_to_from: do not require that "to" should have the same AF. Closes 9146 2016-09-15 13:20:51 +02:00
unicode.c lineedit: improve Unicode handling (still buggy though) 2013-08-19 16:44:05 +02:00
update_passwd.c fix breakage found by mass one-applet builds 2016-12-23 02:42:26 +01:00
utmp.c *: Switch to POSIX utmpx API 2015-04-02 23:03:46 +02:00
uuencode.c libbb: shrink base64 decoding a bit 2011-10-28 16:15:00 +02:00
vdprintf.c libbb.h: remove unused defines 2011-10-24 04:06:18 +02:00
verror_msg.c libbb: speed up error_msg functions 2016-04-03 16:55:03 +02:00
vfork_daemon_rexec.c main: fix the case where user has "halt" as login shell. Closes 9986 2017-07-07 19:08:56 +02:00
warn_ignoring_args.c
wfopen_input.c
wfopen.c
write.c
xatonum_template.c whitespace fixes. no code changes 2013-01-15 13:58:01 +01:00
xatonum.c df: implement -B n<suff> and -B <suff> formats of -B option 2016-12-12 19:56:31 +01:00
xconnect.c libbb: make xmalloc_sockaddr2dotted use NI_NUMERICSCOPE 2016-09-26 19:53:04 +02:00
xfunc_die.c remove global "jmp_buf die_jmp" from !FEATURE_PREFER_APPLETS builds 2015-10-09 16:42:57 +02:00
xfuncs_printf.c libbb/xwrite: print errno on "short write" errors 2016-09-05 15:20:10 +02:00
xfuncs.c libbb: consolidate the code to set termios unbuffered mode 2017-01-11 16:17:59 +01:00
xgetcwd.c
xgethostbyname.c
xreadlink.c libbb: fix a bad check for uclibc >= 0.9.31 2014-03-16 20:53:40 +01:00
xrealloc_vector.c
xregcomp.c

README 

Please see the LICENSE file for copyright information (GPLv2)

libbb is BusyBox's utility library.  All of this stuff used to be stuffed into
a single file named utility.c.  When I split utility.c to create libbb, some of
the very oldest stuff ended up without their original copyright and licensing
information (which is now lost in the mists of time).  If you see something
that you wrote that is mis-attributed, do let me know so we can fix that up.

	Erik Andersen
	<andersen@codepoet.org>