mirror/upx
1
0
Fork 0
mirror of https://github.com/upx/upx synced 2025-09-28 19:06:07 +08:00
Code Issues Releases Wiki Activity

Unpacking --android-shlib works except for restoring DT_INIT

Browse Source 
modified:   p_lx_elf.cpp
This commit is contained in:
John Reiser 2017-03-30 11:05:49 -07:00
parent bd976cd562
commit ebd0c780a1
1 changed files with 23 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
src/p_lx_elf.cpp
View File

@ -3501,26 +3501,6 @@ void PackLinuxElf32::pack4(OutputFile *fo, Filter &ft)
fo->write(buildid_data,shdrout.shdr[1].sh_size);
}
// Cannot pre-round .p_memsz. If .p_filesz < .p_memsz, then kernel
// tries to make .bss, which requires PF_W.
// But strict SELinux (or PaX, grSecurity) disallows PF_W with PF_X.
set_te32(&elfout.phdr[0].p_filesz, sz_pack2 + lsize);
elfout.phdr[0].p_memsz = elfout.phdr[0].p_filesz;
super::pack4(fo, ft); // write PackHeader and overlay_offset
// rewrite Elf header
if (Elf32_Ehdr::ET_DYN==get_te16(&ehdri.e_type)) {
unsigned const base= get_te32(&elfout.phdr[0].p_vaddr);
set_te16(&elfout.ehdr.e_type, Elf32_Ehdr::ET_DYN);
set_te16(&elfout.ehdr.e_phnum, 1);
set_te32( &elfout.ehdr.e_entry,
get_te32(&elfout.ehdr.e_entry) - base);
set_te32(&elfout.phdr[0].p_vaddr, get_te32(&elfout.phdr[0].p_vaddr) - base);
set_te32(&elfout.phdr[0].p_paddr, get_te32(&elfout.phdr[0].p_paddr) - base);
// Strict SELinux (or PaX, grSecurity) disallows PF_W with PF_X
//elfout.phdr[0].p_flags |= Elf32_Phdr::PF_W;
}
if (0!=xct_off) { // shared library
if (opt->o_unix.android_shlib && shdri) { // dlopen() checks Elf32_Shdr vs Elf32_Phdr
unsigned load0_hi = ~0;
@ -3576,7 +3556,29 @@ void PackLinuxElf32::pack4(OutputFile *fo, Filter &ft)
fo->write(snew, k * sizeof(*shdri));
}
}
fo->seek(0, SEEK_SET);
}
// Cannot pre-round .p_memsz. If .p_filesz < .p_memsz, then kernel
// tries to make .bss, which requires PF_W.
// But strict SELinux (or PaX, grSecurity) disallows PF_W with PF_X.
set_te32(&elfout.phdr[0].p_filesz, sz_pack2 + lsize);
elfout.phdr[0].p_memsz = elfout.phdr[0].p_filesz;
super::pack4(fo, ft); // write PackHeader and overlay_offset
// rewrite Elf header
if (Elf32_Ehdr::ET_DYN==get_te16(&ehdri.e_type)) {
unsigned const base= get_te32(&elfout.phdr[0].p_vaddr);
set_te16(&elfout.ehdr.e_type, Elf32_Ehdr::ET_DYN);
set_te16(&elfout.ehdr.e_phnum, 1);
set_te32( &elfout.ehdr.e_entry,
get_te32(&elfout.ehdr.e_entry) - base);
set_te32(&elfout.phdr[0].p_vaddr, get_te32(&elfout.phdr[0].p_vaddr) - base);
set_te32(&elfout.phdr[0].p_paddr, get_te32(&elfout.phdr[0].p_paddr) - base);
// Strict SELinux (or PaX, grSecurity) disallows PF_W with PF_X
//elfout.phdr[0].p_flags |= Elf32_Phdr::PF_W;
}
fo->seek(0, SEEK_SET);
if (0!=xct_off) { // shared library
fo->rewrite(&ehdri, sizeof(ehdri));
fo->rewrite(phdri, e_phnum * sizeof(*phdri));
fo->seek(sz_elf_hdrs, SEEK_SET);
@ -3602,7 +3604,6 @@ void PackLinuxElf32::pack4(OutputFile *fo, Filter &ft)
reloc + get_te32(&phdr->p_paddr));
}
}
fo->seek(0, SEEK_SET);
fo->rewrite(&elfout, sizeof(Elf32_Phdr) * o_phnum + sizeof(Elf32_Ehdr));
fo->seek(sz_elf_hdrs, SEEK_SET); // skip over PT_NOTE bodies, if any
fo->rewrite(&linfo, sizeof(linfo));