work in progress for --android-shlib
modified: p_lx_elf.cpp modified: p_lx_elf.h
This commit is contained in:
John Reiser
parent
fc9c8ae482
commit
a34deee4f5
@ -592,7 +592,7 @@ off_t PackLinuxElf64::pack3(OutputFile *fo, Filter &ft)
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}
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if (opt->o_unix.android_shlib) {
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// Update {DYNAMIC}.sh_offset by so_slide.
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Elf64_Shdr *shdr = shdri;
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Elf64_Shdr *shdr = shdro;
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for (unsigned j = 0; j < e_shnum; ++shdr, ++j) {
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unsigned sh_type = get_te32(&shdr->sh_type);
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if (Elf64_Shdr::SHT_DYNAMIC == sh_type) {
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@ -677,7 +677,7 @@ void PackLinuxElf64::defineSymbols(Filter const *ft)
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}
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PackLinuxElf32::PackLinuxElf32(InputFile *f)
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: super(f), phdro(NULL), phdri(NULL) , shdri(NULL),
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: super(f), phdro(NULL), phdri(NULL), shdro(NULL), shdri(NULL),
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gnu_stack(NULL), note_body(NULL),
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page_mask(~0u<<lg2_page),
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dynseg(NULL), hashtab(NULL), gashtab(NULL), dynsym(NULL),
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@ -694,12 +694,13 @@ PackLinuxElf32::PackLinuxElf32(InputFile *f)
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PackLinuxElf32::~PackLinuxElf32()
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{
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delete[] shdro;
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delete[] phdro;
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delete[] note_body;
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}
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PackLinuxElf64::PackLinuxElf64(InputFile *f)
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: super(f), phdro(NULL), phdri(NULL), shdri(NULL),
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: super(f), phdro(NULL), phdri(NULL), shdro(NULL), shdri(NULL),
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gnu_stack(NULL), note_body(NULL),
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page_mask(~0ull<<lg2_page),
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dynseg(NULL), hashtab(NULL), gashtab(NULL), dynsym(NULL),
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@ -2900,9 +2901,11 @@ void PackLinuxElf64::pack1(OutputFile *fo, Filter & /*ft*/)
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}
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// Relocate dynsym (DT_SYMTAB) which is below xct_va
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Elf64_Sym *sym = const_cast<Elf64_Sym *>(dynsym);
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upx_uint64_t off_dynsym = get_te64(&sec_dynsym->sh_offset);
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upx_uint64_t sz_dynsym = get_te64(&sec_dynsym->sh_size);
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upx_uint64_t const off_dynsym = get_te64(&sec_dynsym->sh_offset);
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upx_uint64_t const sz_dynsym = get_te64(&sec_dynsym->sh_size);
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Elf64_Sym *dyntym = new Elf64_Sym[sz_dynsym / sizeof(Elf64_Sym)];
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memcpy(dyntym, dynsym, sz_dynsym);
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Elf64_Sym *sym = dyntym;
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for (int j = sz_dynsym / sizeof(Elf64_Sym); --j>=0; ++sym) {
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upx_uint64_t symval = get_te64(&sym->st_value);
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unsigned symsec = get_te16(&sym->st_shndx);
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@ -2913,12 +2916,12 @@ void PackLinuxElf64::pack1(OutputFile *fo, Filter & /*ft*/)
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}
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}
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fo->seek(off_dynsym, SEEK_SET);
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fo->rewrite(dynsym, sz_dynsym);
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fo->rewrite(dyntym, sz_dynsym);
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// Relocate Phdr virtual addresses, but not physical offsets and sizes
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unsigned char buf_notes[512]; memset(buf_notes, 0, sizeof(buf_notes));
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unsigned len_notes = 0;
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/* Elf64_Phdr * */ phdr = phdro;
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phdr = phdro;
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for (unsigned j = 0; j < e_phnum; ++j, ++phdr) {
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upx_uint64_t offset = get_te64(&phdr->p_offset);
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if (xct_off <= offset) { // above the extra page
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@ -2949,7 +2952,9 @@ void PackLinuxElf64::pack1(OutputFile *fo, Filter & /*ft*/)
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fo->rewrite(phdro, sz_phdrs); // adjacent to Ehdr
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// Relocate Shdr; and Rela, Rel (below xct_off)
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Elf64_Shdr *shdr = shdri;
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shdro = new Elf64_Shdr[e_shnum];
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memcpy(shdro, shdri, e_shnum * sizeof(*shdro));
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Elf64_Shdr *shdr = shdro;
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upx_uint64_t sz_shstrtab = get_te64(&sec_strndx->sh_size);
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for (int j = e_shnum; --j>=0; ++shdr) {
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unsigned sh_type = get_te32(&shdr->sh_type);
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@ -2969,7 +2974,9 @@ void PackLinuxElf64::pack1(OutputFile *fo, Filter & /*ft*/)
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}
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n_jmp_slot = 0;
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plt_off = ~0ull;
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Elf64_Rela *rela = (Elf64_Rela *)(sh_offset + file_image);
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Elf64_Rela *const relb = new Elf64_Rela[sh_size / sh_entsize];
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memcpy(relb, &file_image[sh_offset], sh_size);
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Elf64_Rela *rela = relb;
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for (int k = sh_size / sh_entsize; --k >= 0; ++rela) {
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upx_uint64_t r_addend = get_te64(&rela->r_addend);
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upx_uint64_t r_offset = get_te64(&rela->r_offset);
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@ -2999,7 +3006,7 @@ void PackLinuxElf64::pack1(OutputFile *fo, Filter & /*ft*/)
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}
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}
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fo->seek(sh_offset, SEEK_SET);
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fo->rewrite(sh_offset + file_image, sh_size);
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fo->rewrite(relb, sh_size);
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}
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if (Elf64_Shdr::SHT_REL == sh_type) {
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if (sizeof(Elf64_Rel) != sh_entsize) {
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@ -3042,7 +3049,10 @@ void PackLinuxElf64::pack1(OutputFile *fo, Filter & /*ft*/)
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// New copy of Shdr
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fo->seek(xct_off, SEEK_SET);
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fo->write(shdri, e_shnum * sizeof(Elf64_Shdr));
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Elf64_Shdr blank; blank = shdro[0];
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set_te64(&blank.sh_offset, xct_off); // hint for "upx -d"
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fo->write(&blank, sizeof(blank));
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fo->write(&shdro[1], (-1+ e_shnum) * sizeof(Elf64_Shdr));
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if (len_notes) {
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fo->write(buf_notes, len_notes);
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@ -3541,7 +3551,7 @@ void PackLinuxElf64::pack4(OutputFile *fo, Filter &ft)
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fo->seek(0, SEEK_SET);
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if (0!=xct_off) { // shared library
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fo->rewrite(&ehdri, sizeof(ehdri));
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fo->rewrite(phdro, e_phnum * sizeof(*phdri));
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fo->rewrite(phdro, e_phnum * sizeof(*phdro));
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fo->seek(sz_elf_hdrs, SEEK_SET);
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fo->rewrite(&linfo, sizeof(linfo));
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}
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@ -3650,8 +3660,16 @@ void PackLinuxElf64::unpack(OutputFile *fo)
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fi->seek(0, SEEK_SET);
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fi->readx(ibuf, overlay_offset + sizeof(hbuf) + szb_info + ph.c_len);
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overlay_offset -= sizeof(linfo);
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xct_off = overlay_offset;
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e_shoff = get_te64(&ehdri.e_shoff);
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if (e_shoff && shdri) { // --android-shlib
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upx_uint64_t xct_off2 = get_te64(&shdri->sh_offset);
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if (e_shoff == xct_off2) {
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xct_off = e_shoff;
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}
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}
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if (fo) {
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fo->write(ibuf + ph.u_len, overlay_offset - ph.u_len);
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fo->write(ibuf + ph.u_len, xct_off - ph.u_len);
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}
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// Search the Phdrs of compressed
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int n_ptload = 0;
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@ -3664,15 +3682,15 @@ void PackLinuxElf64::unpack(OutputFile *fo)
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}
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}
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total_in = overlay_offset;
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total_out = overlay_offset;
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total_in = xct_off;
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total_out = xct_off;
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ph.u_len = 0;
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// Decompress and unfilter the tail of first PT_LOAD.
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phdr = (Elf64_Phdr *) (void *) (1+ ehdr);
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for (unsigned j=0; j < u_phnum; ++phdr, ++j) {
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if (PT_LOAD64==get_te32(&phdr->p_type)) {
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ph.u_len = get_te64(&phdr->p_filesz) - overlay_offset;
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ph.u_len = get_te64(&phdr->p_filesz) - xct_off;
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break;
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}
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}
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@ -159,6 +159,7 @@ protected:
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Elf32_Ehdr ehdri; // from input file
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Elf32_Ehdr *phdro; // especially for shlib
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Elf32_Phdr *phdri; // for input file
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Elf32_Shdr *shdro; // especial for shlib
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Elf32_Shdr *shdri; // from input file
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Elf32_Phdr const *gnu_stack; // propagate NX
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unsigned e_phoff;
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@ -285,6 +286,7 @@ protected:
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Elf64_Ehdr ehdri; // from input file
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Elf64_Phdr *phdro; // especially for shlib
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Elf64_Phdr *phdri; // for input file
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Elf64_Shdr *shdro; // especial for shlib
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Elf64_Shdr *shdri; // from input file
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Elf64_Phdr const *gnu_stack; // propagate NX
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upx_uint64_t e_phoff;
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