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My gcc is in fact clever enough to do it itself, but let's be explicit
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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On certain corrupt gzip files, huft_build will set the error bit on
the result pointer. If afterwards abort_unzip is called huft_free
might run into a segmentation fault or an invalid pointer to
free(p).
In order to mitigate this, we check in huft_free if the error bit
is set and clear it before the linked list is freed.
Signed-off-by: Samuel Sapalski <samuel.sapalski@nokia.com>
Signed-off-by: Peter Kaestle <peter.kaestle@nokia.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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text data bss dec hex filename
1021236 559 5052 1026847 fab1f busybox_old
1021120 559 5052 1026731 faaab busybox_unstripped
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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function old new delta
huft_build 1008 1022 +14
inflate_block 1253 1256 +3
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(add/remove: 0/0 grow/shrink: 2/0 up/down: 17/0) Total: 17 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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function old new delta
inflate_block 1254 1253 -1
inflate_codes 629 621 -8
huft_build 1054 1008 -46
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(add/remove: 0/0 grow/shrink: 0/3 up/down: 0/-55) Total: -55 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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huft_build() still has way too many params
function old new delta
lit - 94 +94
dist - 94 +94
huft_build 1058 1054 -4
inflate_block 1281 1254 -27
cpdext 30 - -30
cplext 31 - -31
cpdist 60 - -60
cplens 62 - -62
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(add/remove: 2/4 grow/shrink: 0/2 up/down: 188/-214) Total: -26 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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huft_build() has way too many params
function old new delta
inflate_block 1293 1281 -12
huft_build 1085 1058 -27
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(add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-39) Total: -39 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Back in 2007, commit 0c97c9d43707 ("'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>
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As it turns out, longjmp'ing into freed stack is not healthy...
function old new delta
unpack_usage_messages - 97 +97
unpack_bz2_stream 369 409 +40
get_next_block 1667 1677 +10
get_bits 156 155 -1
start_bunzip 212 183 -29
bb_show_usage 181 120 -61
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(add/remove: 1/0 grow/shrink: 2/3 up/down: 147/-91) Total: 56 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Corresponding changelog from gzip-1.3.12 reads:
"""
2006-12-20 Paul Eggert <eggert@cs.ucla.edu>
* inflate.c (huft_build): Fix regression that caused gzip to
refuse to uncompress null input (all zero length codes). Problem
reported by Yiorgos Adamopoulos. This regression was caused by
the security patch installed 2006-11-20, which in turn came from
Debian, which in turn apparently came from Thomas Biege of SuSe.
"""
function old new delta
huft_build 1176 1216 +40
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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function old new delta
global_crc32_new_table_le - 11 +11
crc32_new_table_le - 9 +9
inflate_unzip_internal 560 556 -4
flash_eraseall_main 823 819 -4
unpack_xz_stream 2403 2394 -9
lzop_main 121 112 -9
gzip_main 187 178 -9
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(add/remove: 2/0 grow/shrink: 0/5 up/down: 20/-35) Total: -15 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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The somewhat new "unpack in memory" code was broken
for xmalloc_open_zipped_read_close() on NOMMU: we seek back
over signature, but then expect it to be already consumed.
Stop seeking back in this case.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Also, do emit error message we so painstakingly pass from gzip internals
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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function old new delta
huft_build 1296 1300 +4
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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The performance and number of processes for a "depmod -a" with gzipped
modules was abysmal. This patch adds a code path without fork,
benefiting all users of xmalloc_open_zipped_read_close.
"modinfo radeon.ko.gz", a single-file reader, got 30% faster.
"depmod -a", which used to fork over 800 times, got 20% faster.
Heavily based on a patch by Lauri Kasanen <curaga@operamail.com>
function old new delta
setup_transformer_on_fd - 159 +159
transformer_write - 122 +122
fork_transformer - 112 +112
xmalloc_open_zipped_read_close 63 118 +55
read_bunzip 1866 1896 +30
xtransformer_write - 19 +19
unzip_main 2449 2462 +13
bbunpack 755 766 +11
unpack_lzma_stream 2717 2723 +6
unpack_xz_stream 2393 2397 +4
unpack_Z_stream 1173 1175 +2
inflate_unzip 111 105 -6
check_signature16 70 63 -7
unpack_bz2_stream 359 349 -10
unpack_unxz 12 - -12
unpack_unlzma 12 - -12
unpack_uncompress 12 - -12
unpack_gunzip 12 - -12
unpack_bunzip2 12 - -12
open_transformer 106 92 -14
inflate_unzip_internal 1945 1916 -29
unpack_gz_stream 693 655 -38
open_zipped 89 47 -42
setup_unzip_on_fd 142 53 -89
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(add/remove: 4/5 grow/shrink: 7/8 up/down: 533/-295) Total: 238 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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No code changes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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unpack_gz_stream 566 643 +77
unpack_gunzip 123 12 -111
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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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
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(add/remove: 3/3 grow/shrink: 14/6 up/down: 947/-890) Total: 57 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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