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28 Commits

Author SHA1 Message Date
Denys Vlasenko
6ba1f2d0bc tar: prevent malicious archives with enormous long name sizes OOMing the machine 
function                                             old     new   delta
get_header_tar                                      1707    1752     +45

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2021-10-11 19:28:39 +02:00
Denys Vlasenko
b198e9aa93 tar: improve comments, add FIXMEs. no code changes 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2021-10-08 19:34:20 +02:00
Denys Vlasenko
16e82c61d4 tar: fix fallout of last_char_is(NULL) no longer being allowed 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2020-10-02 18:30:53 +02:00
James Byrne
6937487be7 libbb: reduce the overhead of single parameter bb_error_msg() calls 
Back in 2007, commit 0c97c9d437 ("'simple' error message functions by
Loic Grenie") introduced bb_simple_perror_msg() to allow for a lower
overhead call to bb_perror_msg() when only a string was being printed
with no parameters. This saves space for some CPU architectures because
it avoids the overhead of a call to a variadic function. However there
has never been a simple version of bb_error_msg(), and since 2007 many
new calls to bb_perror_msg() have been added that only take a single
parameter and so could have been using bb_simple_perror_message().

This changeset introduces 'simple' versions of bb_info_msg(),
bb_error_msg(), bb_error_msg_and_die(), bb_herror_msg() and
bb_herror_msg_and_die(), and replaces all calls that only take a
single parameter, or use something like ("%s", arg), with calls to the
corresponding 'simple' version.

Since it is likely that single parameter calls to the variadic functions
may be accidentally reintroduced in the future a new debugging config
option WARN_SIMPLE_MSG has been introduced. This uses some macro magic
which will cause any such calls to generate a warning, but this is
turned off by default to avoid use of the unpleasant macros in normal
circumstances.

This is a large changeset due to the number of calls that have been
replaced. The only files that contain changes other than simple
substitution of function calls are libbb.h, libbb/herror_msg.c,
libbb/verror_msg.c and libbb/xfuncs_printf.c. In miscutils/devfsd.c,
networking/udhcp/common.h and util-linux/mdev.c additonal macros have
been added for logging so that single parameter and multiple parameter
logging variants exist.

The amount of space saved varies considerably by architecture, and was
found to be as follows (for 'defconfig' using GCC 7.4):

Arm:     -92 bytes
MIPS:    -52 bytes
PPC:   -1836 bytes
x86_64: -938 bytes

Note that for the MIPS architecture only an exception had to be made
disabling the 'simple' calls for 'udhcp' (in networking/udhcp/common.h)
because it made these files larger on MIPS.

Signed-off-by: James Byrne <james.byrne@origamienergy.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2019-07-02 11:35:03 +02:00
Denys Vlasenko
403d2574be tar: skip 'V' headers (GNU volume label), closes 11526 
function                                             old     new   delta
get_header_tar                                      1696    1690      -6

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-11-27 12:09:01 +01:00
Denys Vlasenko
bb373dbc32 tar: accomodate non-terminated tar.chksum fields as seen from github.com 
function                                             old     new   delta
get_header_tar                                      1783    1696     -87

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-01-27 19:04:08 +01:00
Denys Vlasenko
2ab9403119 whitespace and comment format fixes, no code changes 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2017-10-05 15:33:28 +02:00
Denys Vlasenko
ebe6d9d875 whitespace and comment format fixes, no code changes 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2017-10-05 14:40:24 +02:00
Denys Vlasenko
9655f95d0f tar: handle pax-encoded utf8 filenames and link names. Closes 9406 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2016-11-11 17:56:45 +01:00
Denys Vlasenko
015db5800c randomconfig fixes 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2016-06-19 18:15:33 +02:00
Denys Vlasenko
6c563e370d tar: add support for --strip-components=N 
function                                             old     new   delta
data_extract_all                                     882     995    +113
tar_longopts                                         290     309     +19
tar_main                                             938     942      +4
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/0 up/down: 136/0)             Total: 136 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2015-10-22 01:07:13 +02:00
Denys Vlasenko
bdb540e04f tar: do not try to decode GNU extended headers as pax headers 
function                                             old     new   delta
get_header_tar                                      1736    1692     -44

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2015-05-11 16:55:16 +02:00
Denys Vlasenko
8dff01d06a libbb: introduce and use is_prefixed_with() 
function                                             old     new   delta
is_prefixed_with                                       -      18     +18
complete_username                                     78      77      -1
man_main                                             737     735      -2
fsck_device                                          429     427      -2
unpack_ar_archive                                     80      76      -4
strip_unsafe_prefix                                  105     101      -4
singlemount                                         1054    1050      -4
rtc_adjtime_is_utc                                    90      86      -4
resolve_mount_spec                                    88      84      -4
parse_one_line                                      1029    1025      -4
parse_conf                                          1460    1456      -4
may_wakeup                                            83      79      -4
loadkmap_main                                        219     215      -4
get_irqs_from_stat                                   103      99      -4
get_header_cpio                                      913     909      -4
findfs_main                                           79      75      -4
fbsplash_main                                       1230    1226      -4
load_crontab                                         776     771      -5
expand_vars_to_list                                 1151    1146      -5
date_main                                            881     876      -5
skip_dev_pfx                                          30      24      -6
make_device                                         2199    2193      -6
complete_cmd_dir_file                                773     767      -6
run_applet_and_exit                                  715     708      -7
uudecode_main                                        321     313      -8
pwdx_main                                            197     189      -8
execute                                              568     560      -8
i2cdetect_main                                      1186    1176     -10
procps_scan                                         1242    1230     -12
procps_read_smaps                                   1017    1005     -12
process_module                                       746     734     -12
patch_main                                          1903    1891     -12
nfsmount                                            3572    3560     -12
stack_machine                                        126     112     -14
process_timer_stats                                  449     435     -14
match_fstype                                         111      97     -14
do_ipaddr                                           1344    1330     -14
open_list_and_close                                  359     343     -16
get_header_tar                                      1795    1779     -16
prepend_new_eth_table                                340     323     -17
fsck_main                                           1811    1794     -17
find_iface_state                                      56      38     -18
dnsd_main                                           1321    1303     -18
base_device                                          179     158     -21
find_keyword                                         104      82     -22
handle_incoming_and_exit                            2785    2762     -23
parse_and_put_prompt                                 774     746     -28
modinfo                                              347     317     -30
find_action                                          204     171     -33
update_passwd                                       1470    1436     -34
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/49 up/down: 18/-540)         Total: -522 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2015-03-12 17:48:34 +01:00
Denys Vlasenko
8c06bc6ba1 unzip: prevent attacks via malicious filenames 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2015-02-10 01:30:43 +01:00
Denys Vlasenko
640ce3de07 zcat: complain if input is not compressed 
function                                             old     new   delta
buffer_fill_and_print                                178     191     +13
varvalue                                             735     743      +8
bbunpack                                             747     755      +8
open_zipped                                           85      89      +4
xmalloc_open_zipped_read_close                        61      63      +2
get_addr_1                                           240     242      +2
fbsplash_main                                       1228    1230      +2
pstree_main                                          322     321      -1
builtin_type                                         121     119      -2
do_load                                              954     926     -28
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 7/3 up/down: 39/-31)              Total: 8 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2014-02-02 02:06:38 +01:00
Denys Vlasenko
0f592d7fb9 tar: tighten up pax header validity check 
function                                             old     new   delta
get_header_tar                                      1785    1795     +10

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2014-01-10 18:02:38 +01:00
Denys Vlasenko
ebfa9b5aa1 tar: fix exitcode check for MMU-spawned unpacking helpers 
Testcase: tar xvzf EMPTY_FILE

function                                             old     new   delta
open_transformer                                     102     106      +4
get_header_tar                                      1781    1785      +4

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2013-11-19 14:44:04 +01:00
Denys Vlasenko
440a509849 dpkg: fix creation of .list files (were empty since b768aeb). Closes 5324 
While at it, fix filename order and free the list of names.

function                                             old     new   delta
llist_rev                                              -      21     +21
get_header_tar                                      1733    1741      +8
unpack_package                                       587     585      -2
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 1/1 up/down: 29/-2)              Total: 27 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2012-06-22 16:27:21 +02:00
Etienne Le Sueur
cfc212cdff tar: fix 256-bit encoded number decoding 
Signed-off-by: Etienne Le Sueur <elesueur@vmware.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2012-06-09 08:37:05 +02:00
Denys Vlasenko
8a6a2f9c9c update seamless uncompression code 
This change makes "tar tf hello_world.txz" work without
adding special-casing for ".txz" extension. It also removes
ever-growing magic checking code in rpm2cpio and get_header_tar -
we reuse one which lives in setup_unzip_on_fd.

function                                             old     new   delta
unpack_gz_stream                                       7     566    +559
check_signature16                                      -      70     +70
setup_unzip_on_fd                                     99     142     +43
handle_SIGCHLD                                         -      41     +41
unpack_bz2_stream                                    342     376     +34
unzip_main                                          2352    2385     +33
bbunpack                                             503     533     +30
open_transformer                                      74     102     +28
unpack_Z_stream                                     1278    1304     +26
unpack_gunzip                                        101     123     +22
init_transformer_aux_data                              -      18     +18
unpack_xz_stream                                    2388    2402     +14
open_zipped                                          131     141     +10
rpm_main                                            1358    1363      +5
get_header_tar_lzma                                   52      57      +5
get_header_tar_bz2                                    52      57      +5
unpack_lzma_stream                                  2698    2702      +4
hash_find                                            234     233      -1
get_header_tar                                      1759    1733     -26
get_header_tar_gz                                     92      57     -35
unpack_uncompress                                     51      12     -39
rpm2cpio_main                                        201     147     -54
unpack_unxz                                           67      12     -55
unpack_bz2_stream_prime                               55       -     -55
get_header_tar_Z                                      86       -     -86
unpack_gz_stream_with_info                           539       -    -539
------------------------------------------------------------------------------
(add/remove: 3/3 grow/shrink: 14/6 up/down: 947/-890)          Total: 57 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2012-03-06 16:27:48 +01:00
Denys Vlasenko
6111f967f5 tar: add support for PAX-encoded path=LONGFILENAME 
function                                             old     new   delta
get_header_tar                                      1478    1759    +281

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2012-02-23 13:45:18 +01:00
Denys Vlasenko
f74f280a14 get_header_tar: shrink 6->64 sign extension code 
function                                             old     new   delta
getOctal                                             125     107     -18

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2011-10-19 14:51:12 +02:00
Denys Vlasenko
d184a728cf rename archive.h to bb_archive.h. no code changes 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2011-09-22 12:45:14 +02:00
Ian Wienand
954dbd3a00 tar: ignore file size (assume 0) for hardlinks 
Signed-off-by: Ian Wienand <ianw@vmware.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2011-07-29 08:33:47 +02:00
Denys Vlasenko
b80acf58f1 tar: skip leading / and handle names like abc/..////def -> def (not ///def) 
function                                             old     new   delta
strip_unsafe_prefix                                    -     105    +105
writeFileToTarball                                   557     520     -37
get_header_tar                                      1545    1462     -83

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2011-03-02 01:21:02 +01:00
Denys Vlasenko
5e29e26388 tar: on extract, everything up to and including last ".." is stripped 
function                                             old     new   delta
get_header_tar                                      1493    1545     +52

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2011-03-01 17:21:07 +01:00
Denys Vlasenko
df1689138e remove a few aliasing warnings 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2011-01-16 01:25:34 +01:00
Denys Vlasenko
833d4e7f84 rename archival/libunarchive -> archival/libarchive; move bz/ into it 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2010-11-03 02:38:31 +01:00