Linux命令：readelf

1 需求

关键参数：

-h/--file-header Display the ELF file header
-l/--program-headers/--segments Display the program headers
-S/--section-headers/--sections Display the sections' header
-s/--syms/--symbols Display the symbol table
--dyn-sysm Display the dynamic symbol table
-d/--dynamic Display the dynamic section (if present)
-x/--hex-dump=<number|name> Dump the contents of section <number|name> as bytes
-p/--string-dump=<number|name> Dump the contents of section <number|name> as strings
-W/--wide Allow output width to exceed 80 characters

2 语法

D:\JetBrains\CLion 2022.2.3\bin\mingw\bin>readelf.exe --help
Usage: readelf <option(s)> elf-file(s)Display information about the contents of ELF format filesOptions are:-a --all               Equivalent to: -h -l -S -s -r -d -V -A -I-h --file-header       Display the ELF file header-l --program-headers   Display the program headers--segments          An alias for --program-headers-S --section-headers   Display the sections' header--sections          An alias for --section-headers-g --section-groups    Display the section groups-t --section-details   Display the section details-e --headers           Equivalent to: -h -l -S-s --syms              Display the symbol table--symbols           An alias for --syms--dyn-syms          Display the dynamic symbol table--lto-syms          Display LTO symbol tables--sym-base=[0|8|10|16]Force base for symbol sizes.  The options aremixed (the default), octal, decimal, hexadecimal.-C --demangle[=STYLE]  Decode low-level symbol names into user-level namesThe STYLE, if specified, can be `auto' (the default),`gnu', `lucid', `arm', `hp', `edg', `gnu-v3', `java'or `gnat'--no-demangle       Do not demangle low-level symbol names.  (default)--recurse-limit     Enable a demangling recursion limit.  (default)--no-recurse-limit  Disable a demangling recursion limit-n --notes             Display the core notes (if present)-r --relocs            Display the relocations (if present)-u --unwind            Display the unwind info (if present)-d --dynamic           Display the dynamic section (if present)-V --version-info      Display the version sections (if present)-A --arch-specific     Display architecture specific information (if any)-c --archive-index     Display the symbol/file index in an archive-D --use-dynamic       Use the dynamic section info when displaying symbols-L --lint|--enable-checksDisplay warning messages for possible problems-x --hex-dump=<number|name>Dump the contents of section <number|name> as bytes-p --string-dump=<number|name>Dump the contents of section <number|name> as strings-R --relocated-dump=<number|name>Dump the relocated contents of section <number|name>-z --decompress        Decompress section before dumping it-w --debug-dump[a/=abbrev, A/=addr, r/=aranges, c/=cu_index, L/=decodedline,f/=frames, F/=frames-interp, g/=gdb_index, i/=info, o/=loc,m/=macro, p/=pubnames, t/=pubtypes, R/=Ranges, l/=rawline,s/=str, O/=str-offsets, u/=trace_abbrev, T/=trace_aranges,U/=trace_info]Display the contents of DWARF debug sections-wk --debug-dump=links Display the contents of sections that link to separatedebuginfo files-P --process-links     Display the contents of non-debug sections in separatedebuginfo files.  (Implies -wK)-wK --debug-dump=follow-linksFollow links to separate debug info files (default)-wN --debug-dump=no-follow-linksDo not follow links to separate debug info files--dwarf-depth=N        Do not display DIEs at depth N or greater--dwarf-start=N        Display DIEs starting at offset N--ctf=<number|name>    Display CTF info from section <number|name>--ctf-parent=<number|name>Use section <number|name> as the CTF parent--ctf-symbols=<number|name>Use section <number|name> as the CTF external symtab--ctf-strings=<number|name>Use section <number|name> as the CTF external strtab-I --histogram         Display histogram of bucket list lengths-W --wide              Allow output width to exceed 80 characters-T --silent-truncation If a symbol name is truncated, do not add [...] suffix@<file>                Read options from <file>-H --help              Display this information-v --version           Display the version number of readelf
Report bugs to <https://www.sourceware.org/bugzilla/>

3 示例

readelf -S --wide goahead

3 示例

readelf -s goahead

readelf -s libgo.so

> readelf -s goaheadSymbol table '.dynsym' contains 47 entries:Num:    Value          Size Type    Bind   Vis      Ndx Name0: 0000000000000000     0 NOTYPE  LOCAL  DEFAULT  UND 1: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND websOpen2: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND smatch3: 0000000000000000     0 NOTYPE  WEAK   DEFAULT  UND _ITM_deregisterTMCloneTab4: 0000000000000000     0 OBJECT  GLOBAL DEFAULT  UND logLevel5: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND sfmt6: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND puts@GLIBC_2.2.5 (2)7: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND websGetServer8: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND websGetBackground9: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND error10: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND chdir@GLIBC_2.2.5 (2)11: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND __stack_chk_fail@GLIBC_2.4 (3)12: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND websServiceEvents13: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND getcwd@GLIBC_2.2.5 (2)14: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND websGetDocuments15: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND websSetBackground16: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND websListen17: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND __libc_start_main@GLIBC_2.2.5 (2)18: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND sclone19: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND signal@GLIBC_2.2.5 (2)20: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND fprintf@GLIBC_2.2.5 (2)21: 0000000000000000     0 NOTYPE  WEAK   DEFAULT  UND __gmon_start__22: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND daemon@GLIBC_2.2.5 (2)23: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND logmsgProc24: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND websClose25: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND stok26: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND logSetPath27: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND exit@GLIBC_2.2.5 (2)28: 0000000000000000     0 NOTYPE  WEAK   DEFAULT  UND _ITM_registerTMCloneTable29: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND wfree30: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND websLoad31: 0000000000000000     0 FUNC    WEAK   DEFAULT  UND __cxa_finalize@GLIBC_2.2.5 (2)32: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND websSetDebug33: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND __ctype_b_loc@GLIBC_2.3 (4)34: 0000000000000000     0 OBJECT  GLOBAL DEFAULT  UND stderr@GLIBC_2.2.5 (2)35: 0000000000203010     0 NOTYPE  GLOBAL DEFAULT   23 _edata36: 0000000000203000     0 NOTYPE  GLOBAL DEFAULT   23 __data_start37: 0000000000203018     0 NOTYPE  GLOBAL DEFAULT   24 _end38: 0000000000203000     0 NOTYPE  WEAK   DEFAULT   23 data_start39: 0000000000001910     4 OBJECT  GLOBAL DEFAULT   16 _IO_stdin_used40: 0000000000001890   101 FUNC    GLOBAL DEFAULT   14 __libc_csu_init41: 0000000000000f80    43 FUNC    GLOBAL DEFAULT   14 _start42: 0000000000203010     0 NOTYPE  GLOBAL DEFAULT   24 __bss_start43: 000000000000108a  1396 FUNC    GLOBAL DEFAULT   14 main44: 0000000000000d90     0 FUNC    GLOBAL DEFAULT   11 _init45: 0000000000001900     2 FUNC    GLOBAL DEFAULT   14 __libc_csu_fini46: 0000000000001904     0 FUNC    GLOBAL DEFAULT   15 _finiSymbol table '.symtab' contains 101 entries:Num:    Value          Size Type    Bind   Vis      Ndx Name0: 0000000000000000     0 NOTYPE  LOCAL  DEFAULT  UND 1: 0000000000000238     0 SECTION LOCAL  DEFAULT    1 2: 0000000000000254     0 SECTION LOCAL  DEFAULT    2 3: 0000000000000274     0 SECTION LOCAL  DEFAULT    3 4: 0000000000000298     0 SECTION LOCAL  DEFAULT    4 5: 00000000000002f8     0 SECTION LOCAL  DEFAULT    5 6: 0000000000000760     0 SECTION LOCAL  DEFAULT    6 7: 0000000000000976     0 SECTION LOCAL  DEFAULT    7 8: 00000000000009d8     0 SECTION LOCAL  DEFAULT    8 9: 0000000000000a18     0 SECTION LOCAL  DEFAULT    9 10: 0000000000000b08     0 SECTION LOCAL  DEFAULT   10 11: 0000000000000d90     0 SECTION LOCAL  DEFAULT   11 12: 0000000000000db0     0 SECTION LOCAL  DEFAULT   12 13: 0000000000000f70     0 SECTION LOCAL  DEFAULT   13 14: 0000000000000f80     0 SECTION LOCAL  DEFAULT   14 15: 0000000000001904     0 SECTION LOCAL  DEFAULT   15 16: 0000000000001910     0 SECTION LOCAL  DEFAULT   16 17: 0000000000001db4     0 SECTION LOCAL  DEFAULT   17 18: 0000000000001e10     0 SECTION LOCAL  DEFAULT   18 19: 0000000000202cb8     0 SECTION LOCAL  DEFAULT   19 20: 0000000000202cc0     0 SECTION LOCAL  DEFAULT   20 21: 0000000000202cc8     0 SECTION LOCAL  DEFAULT   21 22: 0000000000202ed8     0 SECTION LOCAL  DEFAULT   22 23: 0000000000203000     0 SECTION LOCAL  DEFAULT   23 24: 0000000000203010     0 SECTION LOCAL  DEFAULT   24 25: 0000000000000000     0 SECTION LOCAL  DEFAULT   25 26: 0000000000000000     0 SECTION LOCAL  DEFAULT   26 27: 0000000000000000     0 SECTION LOCAL  DEFAULT   27 28: 0000000000000000     0 SECTION LOCAL  DEFAULT   28 29: 0000000000000000     0 SECTION LOCAL  DEFAULT   29 30: 0000000000000000     0 SECTION LOCAL  DEFAULT   30 31: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS crtstuff.c32: 0000000000000fb0     0 FUNC    LOCAL  DEFAULT   14 deregister_tm_clones33: 0000000000000ff0     0 FUNC    LOCAL  DEFAULT   14 register_tm_clones34: 0000000000001040     0 FUNC    LOCAL  DEFAULT   14 __do_global_dtors_aux35: 0000000000203010     1 OBJECT  LOCAL  DEFAULT   24 completed.769836: 0000000000202cc0     0 OBJECT  LOCAL  DEFAULT   20 __do_global_dtors_aux_fin37: 0000000000001080     0 FUNC    LOCAL  DEFAULT   14 frame_dummy38: 0000000000202cb8     0 OBJECT  LOCAL  DEFAULT   19 __frame_dummy_init_array_39: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS goahead.c40: 0000000000203014     4 OBJECT  LOCAL  DEFAULT   24 finished41: 0000000000001813    58 FUNC    LOCAL  DEFAULT   14 usage42: 000000000000184d    39 FUNC    LOCAL  DEFAULT   14 initPlatform43: 00000000000015fe   533 FUNC    LOCAL  DEFAULT   14 logHeader44: 0000000000001874    20 FUNC    LOCAL  DEFAULT   14 sigHandler45: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS crtstuff.c46: 0000000000001f94     0 OBJECT  LOCAL  DEFAULT   18 __FRAME_END__47: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS 48: 0000000000202cc0     0 NOTYPE  LOCAL  DEFAULT   19 __init_array_end49: 0000000000203008     0 OBJECT  LOCAL  DEFAULT   23 __dso_handle50: 0000000000202cc8     0 OBJECT  LOCAL  DEFAULT   21 _DYNAMIC51: 0000000000202cb8     0 NOTYPE  LOCAL  DEFAULT   19 __init_array_start52: 0000000000001db4     0 NOTYPE  LOCAL  DEFAULT   17 __GNU_EH_FRAME_HDR53: 0000000000203010     0 OBJECT  LOCAL  DEFAULT   23 __TMC_END__54: 0000000000202ed8     0 OBJECT  LOCAL  DEFAULT   22 _GLOBAL_OFFSET_TABLE_55: 0000000000001900     2 FUNC    GLOBAL DEFAULT   14 __libc_csu_fini56: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND websOpen57: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND smatch58: 0000000000000000     0 NOTYPE  WEAK   DEFAULT  UND _ITM_deregisterTMCloneTab59: 0000000000203000     0 NOTYPE  WEAK   DEFAULT   23 data_start60: 0000000000000000     0 OBJECT  GLOBAL DEFAULT  UND logLevel61: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND sfmt62: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND puts@@GLIBC_2.2.563: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND websGetServer64: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND websGetBackground65: 0000000000203010     0 NOTYPE  GLOBAL DEFAULT   23 _edata66: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND error67: 0000000000001904     0 FUNC    GLOBAL DEFAULT   15 _fini68: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND chdir@@GLIBC_2.2.569: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND __stack_chk_fail@@GLIBC_270: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND websServiceEvents71: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND getcwd@@GLIBC_2.2.572: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND websGetDocuments73: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND websSetBackground74: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND websListen75: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND __libc_start_main@@GLIBC_76: 0000000000203000     0 NOTYPE  GLOBAL DEFAULT   23 __data_start77: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND sclone78: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND signal@@GLIBC_2.2.579: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND fprintf@@GLIBC_2.2.580: 0000000000000000     0 NOTYPE  WEAK   DEFAULT  UND __gmon_start__81: 0000000000001910     4 OBJECT  GLOBAL DEFAULT   16 _IO_stdin_used82: 0000000000001890   101 FUNC    GLOBAL DEFAULT   14 __libc_csu_init83: 0000000000203018     0 NOTYPE  GLOBAL DEFAULT   24 _end84: 0000000000000f80    43 FUNC    GLOBAL DEFAULT   14 _start85: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND daemon@@GLIBC_2.2.586: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND logmsgProc87: 0000000000203010     0 NOTYPE  GLOBAL DEFAULT   24 __bss_start88: 000000000000108a  1396 FUNC    GLOBAL DEFAULT   14 main89: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND websClose90: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND stok91: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND logSetPath92: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND exit@@GLIBC_2.2.593: 0000000000000000     0 NOTYPE  WEAK   DEFAULT  UND _ITM_registerTMCloneTable94: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND wfree95: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND websLoad96: 0000000000000000     0 FUNC    WEAK   DEFAULT  UND __cxa_finalize@@GLIBC_2.297: 0000000000000d90     0 FUNC    GLOBAL DEFAULT   11 _init98: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND websSetDebug99: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND __ctype_b_loc@@GLIBC_2.3100: 0000000000000000     0 OBJECT  GLOBAL DEFAULT  UND stderr@@GLIBC_2.2.5

3 示例：查看依赖库