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Try to placate Android crapware, which cannot deal with null strings

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From https://github.com/upx/upx/issues/220 :

Phone:
04-10 16:07:52.862 E/AndroidRuntime( 5178): java.lang.UnsatisfiedLinkError: dlopen failed: \
"/data/app/~~Nwb-iR6LHpHyrT37xe8HNg==/com.android.support-y0YbcwLn1b4sBRD09JGVAw==/lib/arm64/libMyLibName.so" \
has unsupported e_shentsize: 0x0 (expected 0x40)

Emulator:
04-10 09:57:38.746 E/AndroidRuntime( 6403): java.lang.UnsatisfiedLinkError: dlopen failed: \
"/data/app/~~sBBMDvh36TxwO4muxOJ3Bg==/com.android.support-8Lc6r2dLzTIW7SEHXLI0XQ==/lib/arm64/libMyLibName.so" \
has no section headers

	modified:   p_lx_elf.cpp
This commit is contained in:
John Reiser 2023-04-11 13:41:54 -07:00
parent 7b2faf2016
commit 3bdfcaa541
1 changed files with 54 additions and 9 deletions
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63
src/p_lx_elf.cpp
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@ -5544,6 +5544,7 @@ void PackLinuxElf32::forward_Shdrs(OutputFile *fo)
unsigned const want_types_mask =
1u<<SHT_SYMTAB
| 1u<<SHT_RELA
| 1u<<SHT_PROGBITS // see comment at PackLinuxElf64::forward_Shdrs
| 1u<<SHT_HASH
| 1u<<SHT_DYNAMIC
| 1u<<SHT_NOTE
@ -5666,6 +5667,35 @@ void PackLinuxElf64::forward_Shdrs(OutputFile *fo)
// Keep _Shdr for SHF_WRITE.
// Discard _Shdr with (0==sh_addr), except _Shdr[0]
// Keep ARM_ATTRIBUTES
unsigned const want_types_mask =
1u<<SHT_SYMTAB
| 1u<<SHT_RELA
| 1u<<SHT_PROGBITS
// SHT_PROGBITS is needed else gdb complains:
// /build/gdb-MVZsgD/gdb-10.1/gdb/symfile.c:878: internal-error: sect_index_text not initialized
// and Continuing is not reasonable.
// However, SHT_PROGBITS with compression gives:
// BFD: warning: ./libmain.so.upx has a section extending past end of file
// BFD: warning: ./libmain.so.upx has a section extending past end of file
// BFD: warning: ./libmain.so.upx has a section extending past end of file
// warning: Loadable section ".text" outside of ELF segments
// warning: Loadable section ".plt" outside of ELF segments
// because compression gives smaller extents, with no reasonable _Shdr fields.
// At least gdb can continue.
| 1u<<SHT_HASH
| 1u<<SHT_DYNAMIC
| 1u<<SHT_NOTE
| 1u<<SHT_REL
| 1u<<SHT_DYNSYM
| 1u<<SHT_INIT_ARRAY
| 1u<<SHT_FINI_ARRAY
| 1u<<SHT_PREINIT_ARRAY
| 1u<<(0x1f & SHT_GNU_versym)
| 1u<<(0x1f & SHT_GNU_verneed)
| 1u<<(0x1f & SHT_GNU_verdef)
| 1u<<(0x1f & SHT_GNU_HASH);
Elf64_Ehdr *eho = (Elf64_Ehdr *)lowmem.getVoidPtr();
MemBuffer mb_ask_for(e_shnum * sizeof(eho->e_shnum));
memset(mb_ask_for, 0, mb_ask_for.getSize());
@ -5683,6 +5713,7 @@ void PackLinuxElf64::forward_Shdrs(OutputFile *fo)
u64_t sh_offset = get_te64(&sh_in->sh_offset);
u64_t sh_flags = get_te64(&sh_in->sh_flags);
unsigned sh_info = get_te16(&sh_in->sh_info);
unsigned sh_type = get_te32(&sh_in->sh_type);
if (ask_for[j]) { // Some previous _Shdr requested me
// Tell them my new index
set_te16(&sh_out0[ask_for[j]].sh_info, n_sh_out);
@ -5692,6 +5723,7 @@ void PackLinuxElf64::forward_Shdrs(OutputFile *fo)
|| (Elf64_Shdr::SHF_WRITE & sh_flags)
|| (j == e_shstrndx)
|| (sec_arm_attr == sh_in)
|| (want_types_mask & (1<<(0x1f & sh_type)))
) {
*sh_out = *sh_in;
if (sec_arm_attr == sh_in) {
@ -5711,8 +5743,10 @@ void PackLinuxElf64::forward_Shdrs(OutputFile *fo)
fo->write(ibuf, len);
total_out += len;
}
if (Elf64_Shdr::SHF_WRITE & sh_flags) {
set_te64(&sh_out->sh_offset, so_slide + get_te64(&sh_out->sh_offset));
if (Elf64_Shdr::SHF_WRITE & sh_flags || SHT_NOTE == sh_type) {
if (sh_offset > xct_off) {
set_te64(&sh_out->sh_offset, so_slide + sh_offset);
}
}
++sh_out; ++n_sh_out;
}
@ -5813,7 +5847,7 @@ void PackLinuxElf32::pack4(OutputFile *fo, Filter &ft)
// Make it abunantly clear that there are no Elf32_Shdr in this shlib
Elf32_Ehdr *ehdro = (Elf32_Ehdr *)lowmem.getVoidPtr();
ehdro->e_shoff = 0;
ehdro->e_shentsize = 0;
ehdro->e_shentsize = sizeof(Elf32_Shdr); // Android bug: cannot use 0
ehdro->e_shnum = 0;
ehdro->e_shstrndx = 0;
}
@ -5853,6 +5887,7 @@ void PackLinuxElf64::pack4(OutputFile *fo, Filter &ft)
overlay_offset = sz_elf_hdrs + sizeof(linfo);
}
forward_Shdrs(fo);
if (opt->o_unix.preserve_build_id) {
// calc e_shoff here and write shdrout, then o_shstrtab
//NOTE: these are pushed last to ensure nothing is stepped on
@ -5891,16 +5926,26 @@ void PackLinuxElf64::pack4(OutputFile *fo, Filter &ft)
set_te64(&phdro->p_flags, Elf64_Phdr::PF_X | get_te64(&phdro->p_flags));
}
}
// Make it abundantly clear that there are no Elf64_Shdr in a compressed shlib
Elf64_Ehdr *ehdro = (Elf64_Ehdr *)lowmem.getVoidPtr();
ehdro->e_shoff = 0;
ehdro->e_shentsize = 0;
ehdro->e_shnum = 0;
ehdro->e_shstrndx = 0;
if (!sec_arm_attr && !saved_opt_android_shlib) {
// Make it abunantly clear that there are no Elf64_Shdr in this shlib
Elf64_Ehdr *ehdro = (Elf64_Ehdr *)lowmem.getVoidPtr();
ehdro->e_shoff = 0;
ehdro->e_shentsize = sizeof(Elf64_Shdr); // Android bug: cannot use 0
ehdro->e_shnum = 0;
ehdro->e_shstrndx = 0;
}
fo->rewrite(&lowmem[0], sizeof(ehdri) + e_phnum * sizeof(*phdri));
fo->seek(linfo_off, SEEK_SET);
fo->rewrite(&linfo, sizeof(linfo)); // new info: l_checksum, l_size
if (jni_onload_va) { // FIXME Does this apply to 64-bit, too?
unsigned tmp = sz_pack2 + get_te64(&elfout.phdr[C_TEXT].p_vaddr);
tmp |= (Elf64_Ehdr::EM_ARM==e_machine); // THUMB mode; no-op for 64-bit
set_te64(&tmp, tmp);
fo->seek(ptr_udiff_bytes(&jni_onload_sym->st_value, file_image), SEEK_SET);
fo->rewrite(&tmp, sizeof(tmp));
}
}
else {
Elf64_Phdr *phdr = &elfout.phdr[C_NOTE];