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Code Issues Releases Wiki Activity

Try to appease Android runtime loader; _Shdr vs _Phdr offsets

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JNI FalalError called: Unable to load library:
    [dlopen failed: "/lib/arm/libunity.so"
    .dynamic section has invalid offset: 0x6d3e58,
    expected to match PT_DYNAMIC offset: 0x441e58]
https://github.com/upx/upx/issues/609
	modified:   p_elf_enum.h
	modified:   p_lx_elf.cpp
This commit is contained in:
John Reiser 2023-03-26 10:53:30 -07:00
parent b5d1eba4c1
commit b361b91ec7
2 changed files with 32 additions and 5 deletions
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7
src/p_elf_enum.h
View File

@ -127,9 +127,12 @@
SHT_FINI_ARRAY = 15, /* Array of destructors */
SHT_PREINIT_ARRAY = 16, /* Array of pre-constructors */
SHT_GROUP = 17, /* Section group */
SHT_SYMTAB_SHNDX = 18, /* Extended section indeces */
SHT_SYMTAB_SHNDX = 18, /* Extended section indices */
SHT_GNU_HASH = 0x6ffffff6, /* GNU-style hash table. */
SHT_GNU_LIBLIST = 0x6ffffff7, /* Prelink library list */
SHT_GNU_HASH = 0x6ffffff6, /* GNU-style hash table. */
SHT_GNU_verdef = 0x6ffffffd, /* Version definition section. */
SHT_GNU_verneed = 0x6ffffffe, /* Version needs section. */
SHT_GNU_versym = 0x6fffffff, /* Version symbol table. */
SHT_LOOS = 0x60000000, /* LOcal OS; SHT_ANDROID_REL{,A} is +1, +2 */
SHT_LOPROC = 0x70000000, /* Start of processor-specific */

30
src/p_lx_elf.cpp
View File

@ -1660,6 +1660,7 @@ static const
#define WANT_NHDR_ENUM
#include "p_elf_enum.h"
#undef WANT_NHDR_ENUM
void
PackNetBSDElf32x86::buildLoader(const Filter *ft)
@ -5477,6 +5478,10 @@ void PackLinuxElf32mipsel::defineSymbols(Filter const *ft)
PackLinuxElf32::defineSymbols(ft);
}
#define WANT_SHDR_ENUM
#include "p_elf_enum.h"
#undef WANT_SHDR_ENUM
void PackLinuxElf32::forward_Shdrs(OutputFile *fo)
{
if (saved_opt_android_shlib) { // Forward select _Shdr
@ -5485,6 +5490,21 @@ void PackLinuxElf32::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 =
1<<SHT_SYMTAB
| 1<<SHT_RELA
| 1<<SHT_HASH
| 1<<SHT_DYNAMIC
| 1<<SHT_NOTE
| 1<<SHT_REL
| 1<<SHT_DYNSYM
| 1<<SHT_INIT_ARRAY
| 1<<SHT_FINI_ARRAY
| 1<<SHT_PREINIT_ARRAY
| 1<<(0x1f & SHT_GNU_versym)
| 1<<(0x1f & SHT_GNU_verneed)
| 1<<(0x1f & SHT_GNU_verdef)
| 1<<(0x1f & SHT_GNU_HASH);
Elf32_Ehdr *eho = (Elf32_Ehdr *)lowmem.getVoidPtr();
MemBuffer mb_ask_for(e_shnum * sizeof(eho->e_shnum));
memset(mb_ask_for, 0, mb_ask_for.getSize());
@ -5501,7 +5521,8 @@ void PackLinuxElf32::forward_Shdrs(OutputFile *fo)
for (unsigned j = 1; j < e_shnum; ++j, ++sh_in) {
unsigned sh_offset = get_te32(&sh_in->sh_offset);
unsigned sh_flags = get_te32(&sh_in->sh_flags);
unsigned sh_info = get_te16(&sh_in->sh_info);
unsigned sh_info = get_te32(&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);
@ -5511,6 +5532,7 @@ void PackLinuxElf32::forward_Shdrs(OutputFile *fo)
|| (Elf32_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) {
@ -5530,8 +5552,10 @@ void PackLinuxElf32::forward_Shdrs(OutputFile *fo)
fo->write(ibuf, len);
total_out += len;
}
if (Elf32_Shdr::SHF_WRITE & sh_flags) {
set_te32(&sh_out->sh_offset, so_slide + get_te32(&sh_out->sh_offset));
if (Elf32_Shdr::SHF_WRITE & sh_flags || SHT_NOTE == sh_type) {
if (sh_offset > xct_off) {
set_te32(&sh_out->sh_offset, so_slide + sh_offset);
}
}
++sh_out; ++n_sh_out;
}