tree 655e4497b01fe387421cc054fff49b23fe1c9b2a
parent dcc5e12939792380a8c93ed7380c365a800faa4c
author Juan Yescas <jyescas@google.com> 1725666389 -0700
committer Juan Yescas <jyescas@google.com> 1725667201 -0700

Generate invalid shared library with size of section headers as zero

This change will generate a shared library that contains an
invalid executable header. The executable header will
set the size of the section headers as zero.

     elf64Binary.ehdr.e_shentsize = 0;

Bug: 347728628
Test: $ m geninvalelf64
      $ adb push out/target/product/vsoc_x86_64_pgagnostic/system/bin/geninvalelf64 /data
      $ vsoc_x86_64_pgagnostic:/data # ./geninvalelf64 ./test_x86_64/libtest_empty.so ./test_x86_64
      Writing ELF64 binary to file ./test_x86_64/libtest_invalid-zero_shentsize.so
      $ vsoc_x86_64_pgagnostic:/data # ldd $PWD/test_x86_64/libtest_invalid-zero_shentsize.so
      "/data/test_x86_64/libtest_invalid-zero_shentsize.so" has unsupported e_shentsize: 0x0 (expected 0x40)
      error: "/data/test_x86_64/libtest_invalid-zero_shentsize.so" has unsupported e_shentsize: 0x0 (expected 0x40)
      $ vsoc_x86_64_pgagnostic:/data # readelf -h ./test_x86_64/libtest_invalid-zero_shentsize.so
      readelf: ./test_x86_64/libtest_invalid-zero_shentsize.so: bad shstrndx
      ELF Header:
        Magic:   7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00
        Class:                             ELF64
        Data:                              2's complement, little endian
        Version:                           1 (current)
        OS/ABI:                            UNIX - System V
        ABI Version:                       0
        Type:                              DYN (Shared object file)
        Machine:                           x86-64
        Version:                           0x1
        Entry point address:               0x0
        Start of program headers:          64 (bytes into file)
        Start of section headers:          3216 (bytes into file)
        Flags:                             0x0
        Size of this header:               64 (bytes)
        Size of program headers:           56 (bytes)
        Number of program headers:         9
        Size of section headers:           0 (bytes)
        Number of section headers:         22
        Section header string table index: 20$

        $ vsoc_x86_64_pgagnostic:/data # readelf -l ./test_x86_64/libtest_invalid-zero_shentsize.so
        readelf: ./test_x86_64/libtest_invalid-zero_shentsize.so: bad shstrndx

Change-Id: Ib5b0d0c92f04f53052c6b42c7c33135cf95352bb