scanelf 1 &project; scanelf user-space utility to scan ELF files scanelf options ELFs or directories scanelf is a user-space utility to quickly scan given ELFs, directories, or common system paths for different information. This may include ELF types, their PaX markings, TEXTRELs, etc... -A, --archives Scan archives (.a files) -a, --all Print all useful/simple info -B, --nobanner Don't display the header -b, --bind Print symbol binding information (lazy or now) -D, --endian Print ELF endianness (big/little/...) -E, --etype ETYPE Print only ELF files matching specified etype (like ET_DYN, ET_EXEC, etc...) -e, --header Print GNU_STACK markings -F, --format FORMAT Use specified format for output; see the FORMAT section for more information -f, --from FILE Read input stream from specified filename -g, --gmatch Use strncmp to match libraries (use with -N). Or regexp with symbol matching -h, --help Show condensed usage and exit -I, --osabi Print OSABI -i, --interp Print the interpreter information (.interp/PT_INTERP) -k, --section SECTION Find ELFs with the specified section. May be specified multiple times to match multiple sections simultaneously. See SECTION MATCHING for more info. -L, --ldcache Utilize ld.so.cache information (use with -r/-n) -l, --ldpath Scan all directories in /etc/ld.so.conf -M, --bits BITS Print only ELF files matching specified numeric bits (like 32/64) -m, --mount Don't recursively cross mount points -N, --lib SONAME Find ELFs that need the specified SONAME. May be specified multiple times to match multiple SONAMEs simultaneously. See SONAME MATCHING for more info. -n, --needed Print libraries the ELF is linked against (DT_NEEDED) -O, --perms PERMS Print only ELF files with matching specified octal bits (like 755) -o, --file FILE Write output stream to specified filename -p, --path Scan all directories in PATH environment -q, --quiet Only output 'bad' things -R, --recursive Scan directories recursively -r, --rpath Print runpaths encoded in the ELF (DT_RPATH/DT_RUNPATH) -S, --soname Print the ELF's shared library name (DT_SONAME) -s, --symbol SYMBOL Find the specified symbol; see SYMBOL MATCHING for more info -T, --textrels Locate cause of TEXTRELs via objdump -t, --textrel Print TEXTREL information -V, --version Print version and exit -v, --verbose Be verbose (can be used more than once) -X, --fix Try and 'fix' bad things (use with -r/-e) -x, --pax Print PaX markings -Y, --eabi Print EABI (only matters for a few architectures) -y, --symlink Don't scan symlinks -Z, --size SIZE Print ELF file size -z, --setpax FLAGS Sets EI_PAX/PT_PAX_FLAGS to specified flags (use with -Xx) --use-ldpath Use the ld.so.conf paths to find the full path to libraries (use in conjunction with --needed). --root PATH Search the specified root tree instead of /. Generally paired with options like -l or -p. This implicitly treats all paths specified on the command line as relative to the root, so be sure to omit it if you are explicitly listing ELFs. --ldcache PATH Use specified path instead of /etc/ld.so.cache. Generally paired with options like -L or -n. The format string is much like a printf string in that it is a literal string with flags requesting different information. For example, you could use a format string and expect the following results. # scanelf -BF "file %f needs %n; funky time" /bin/bash file bash needs libncurses.so.5,libdl.so.2,libc.so.6; funky time Note that when you use a format string, generally information related flags should be omitted. In other words, you do not want to try and request NEEDED output (-n) and try to specify a format output at the same time as these operations are mutually exclusive. Each information related flag has an equivalent conversion specifier, so use those instead. You can of course continue to use non-information related flags (such as --verbose). There are three characters that introduce conversion specifiers. % - replace with info # - silent boolean match + - verbose match And there are a number of conversion specifiers. We try to match up the specifier with corresponding option. a - machine (EM) type b - bind flags e - program headers D - endian I - osabi Y - eabi F - long filename f - short filename i - interp k - section M - EI class N - specified needed n - needed libraries p - filename (minus search) o - etype O - perms r - runpaths S - SONAME s - symbol T - all textrels t - textrel status x - pax flags The string specified takes the form [%[modifiers]%][[+-]<symbol name>][,[.....]]. If the symbol name is empty, then all symbols are matched. If the symbol name is a glob ("*"), then all symbols are dumped in a debug format. Do not rely on the structure of this output as it changes whenever we feel like it. If the first char of the symbol name is a plus ("+"), then only match defined symbols. If it's a minus ("-"), only match undefined symbols. When we say "defined", we mean the symbol is defined in the ELF vs having an external reference. Putting modifiers in between the percent signs ("%") allows for more in depth filters. There are groups of modifiers. If you don't specify a member of a group, then all types in that group are matched. STT group (symbol type) n - STT_NOTYPE o - STT_OBJECT f - STT_FUNC F - STT_FILE STB group (symbol binding) l - STB_LOCAL g - STB_GLOBAL w - STB_WEAK STV group (symbol visibility) p - STV_DEFAULT i - STV_INTERNAL h - STV_HIDDEN P - STV_PROTECTED SHN group (section header) d - defined u - SHN_UNDEF a - SHN_ABS c - SHN_COMMON You can search for multiple symbols simultaneously by using a comma (",") to separate different searches. Every symbol that matches will be displayed while unmatched symbols will not. You can narrow your search by specifying the ELF object file type (ETYPE). The commandline option takes the numeric value and or symbolic type. Multiple values can be passed comma separated. Example -E ET_EXEC,ET_DYN,1 Here is the normal list available for your pleasure. You of course are free to specify any numeric value you want. 0 - ET_NONE - unknown type 1 - ET_REL - relocatable file 2 - ET_EXEC - executable file 3 - ET_DYN - shared object 4 - ET_CORE - core file You can also narrow your search by specifying the ELF bitsize. Again, specify the numeric value or the symbolic define. 32 - ELFCLASS32 - 32bit ELFs 64 - ELFCLASS64 - 64bit ELFs A ! prefix will only show ELF's that do not have the specified section. A ! prefix will only show ELF's that do not depend on the specified library. &reftail;