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I am trying to dump the full paths of the shared libraries that are imported by an ELF file (/usr/bin/ls)

Using readelf --dyn-syms /usr/bin/ls I get the name of the libraries, but not where they are located on the filesystem:

101: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [...]@LIBSELINUX_1.0 (4)

Using objdump -T /usr/bin/ls I get even more information (including function names):

0000000000000000      DF *UND*  0000000000000000 (LIBSELINUX_1.0) getfilecon

This is useful information, but how can I extract the location of the library on disk? I could run the file and see what it opens via lsof, but is there any way to do this without running the file?

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  • Read man ldd ld.so. ldd /usr/bin/ls. ld.so loads and interprets the ELF file, mapping the shared libraries, reading the code into memory, allocating writable data, and starting your program.
    – waltinator
    Feb 28, 2022 at 20:19
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    Does ldd /usr/bin/ls give you the information you need? LD_LIBRARY_PATH and /etc/ld.so.conf will change what libraries are loaded.
    – doneal24
    Feb 28, 2022 at 20:19
  • Yes someone post in an answer if you want, thank you
    – dcom-launch
    Feb 28, 2022 at 20:39

1 Answer 1

Reset to default
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This is what ldd is for:

$ ldd /bin/ls
    linux-vdso.so.1 (0x00007ffd67705000)
    libselinux.so.1 => /lib/x86_64-linux-gnu/libselinux.so.1 (0x00007f25aaab6000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f25aa8f1000)
    libpcre2-8.so.0 => /usr/lib/x86_64-linux-gnu/libpcre2-8.so.0 (0x00007f25aa859000)
    libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f25aa853000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f25aab52000)
    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f25aa831000)

This is liable to include more than the libraries shown by readelf, since it will process transitive dependencies as well.

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