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SCANELF(1) Documentation for pax-utils SCANELF(1)

NAME

scanelf - user-space utility to scan ELF files

SYNOPSIS

scanelf [ options] ELFs or directories

DESCRIPTION

 
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...

OPTIONS

-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
-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
-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)

FORMAT

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 sametime 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
 

SYMBOL MATCHING

A - prefix will only show undefined references while a + prefix will only show defined references while no prefix will show both.

ELF ETYPES

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
 

ELF BITS

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
 

HOMEPAGE

http://hardened.gentoo.org/pax-utils.xml

REPORTING BUGS

Please include as much information as possible (using any available debugging options) and send bug reports to the maintainers (see the AUTHORS section). Please use the Gentoo bugzilla at http://bugs.gentoo.org/ if possible.

SEE ALSO

 
chpax(1), dumpelf(1), paxctl(1), pspax(1), readelf(1), scanelf(1)

AUTHORS

Ned Ludd <solar@gentoo.org>
Maintainer
Mike Frysinger <vapier@gentoo.org>
Maintainer
Fabian Groffen <grobian@gentoo.org>
Mach-O Maintainer

NOTES

1.
http://hardened.gentoo.org/pax-utils.xml
2.
http://bugs.gentoo.org/
03/03/2011 pax-utils 0.2.3