38ccd6af8a
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 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 2/3 up/down: 147/-91) Total: 56 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* This file was released into the public domain by Paul Fox.
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*/
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//config:config BBCONFIG
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//config: bool "bbconfig (9.7 kb)"
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//config: default n
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//config: help
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//config: The bbconfig applet will print the config file with which
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//config: busybox was built.
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//config:
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//config:config FEATURE_COMPRESS_BBCONFIG
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//config: bool "Compress bbconfig data"
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//config: default y
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//config: depends on BBCONFIG
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//config: help
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//config: Store bbconfig data in compressed form, uncompress them on-the-fly
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//config: before output.
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//config:
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//config: If you have a really tiny busybox with few applets enabled (and
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//config: bunzip2 isn't one of them), the overhead of the decompressor might
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//config: be noticeable. Also, if you run executables directly from ROM
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//config: and have very little memory, this might not be a win. Otherwise,
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//config: you probably want this.
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//applet:IF_BBCONFIG(APPLET(bbconfig, BB_DIR_BIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_BBCONFIG) += bbconfig.o
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//usage:#define bbconfig_trivial_usage
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//usage: ""
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//usage:#define bbconfig_full_usage "\n\n"
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//usage: "Print the config file used by busybox build"
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#include "libbb.h"
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#include "bbconfigopts.h"
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#if ENABLE_FEATURE_COMPRESS_BBCONFIG
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# include "bb_archive.h"
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# include "bbconfigopts_bz2.h"
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#endif
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int bbconfig_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int bbconfig_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
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{
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#if ENABLE_FEATURE_COMPRESS_BBCONFIG
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bunzip_data *bd;
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int i;
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jmp_buf jmpbuf;
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/* Setup for I/O error handling via longjmp */
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i = setjmp(jmpbuf);
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if (i == 0) {
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i = start_bunzip(&jmpbuf,
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&bd,
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/* src_fd: */ -1,
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/* inbuf: */ bbconfig_config_bz2,
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/* len: */ sizeof(bbconfig_config_bz2)
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);
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}
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/* read_bunzip can longjmp and end up here with i != 0
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* on read data errors! Not trivial */
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if (i == 0) {
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/* Cannot use xmalloc: will leak bd in NOFORK case! */
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char *outbuf = malloc_or_warn(sizeof(bbconfig_config));
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if (outbuf) {
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read_bunzip(bd, outbuf, sizeof(bbconfig_config));
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full_write1_str(outbuf);
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}
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}
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#else
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full_write1_str(bbconfig_config);
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#endif
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return 0;
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}
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