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work in progress: de-compression of --android-shlib

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OK except for asl_delta not removed from DT_INIT, DT_INIT_ARRAY,
DT_FINI_ARRAY, DT_PREINIT_ARRAY
	modified:   ../p_lx_elf.cpp
This commit is contained in:
John Reiser 2018-01-21 18:59:21 -08:00
parent 7d2913709c
commit 9fdddfc332
1 changed files with 18 additions and 21 deletions
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39
src/p_lx_elf.cpp
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@ -2873,8 +2873,9 @@ void PackLinuxElf64::pack1(OutputFile *fo, Filter & /*ft*/)
page_mask = ~0ull<<lg2_page;
progid = 0; // getRandomId(); not useful, so do not clutter
sz_elf_hdrs = sizeof(ehdri) + sz_phdrs;
if (0!=xct_off) { // shared library
sz_elf_hdrs = sizeof(ehdri) + sz_phdrs;
sz_elf_hdrs = xct_off;
lowmem.alloc(xct_off + (!opt->o_unix.android_shlib
? 0
: e_shnum * sizeof(Elf64_Shdr)));
@ -3295,25 +3296,24 @@ int PackLinuxElf64::pack2(OutputFile *fo, Filter &ft)
uip->ui_total_passes -= !!is_shlib; // not .data of shlib
// compress extents
unsigned hdr_u_len = sizeof(Elf64_Ehdr) + sz_phdrs;
unsigned hdr_u_len = xct_off;
unsigned total_in = xct_off - (is_shlib ? hdr_u_len : 0);
unsigned total_out = xct_off;
unsigned total_in = 0;
unsigned total_out = sz_elf_hdrs;
uip->ui_pass = 0;
ft.addvalue = 0;
int nx = 0;
for (k = 0; k < e_phnum; ++k) if (PT_LOAD64==get_te32(&phdri[k].p_type)) {
for (k = 0; k < e_phnum; ++k)
if (PT_LOAD64==get_te32(&phdri[k].p_type)) {
if (ft.id < 0x40) {
// FIXME: ?? ft.addvalue = phdri[k].p_vaddr;
}
x.offset = get_te64(&phdri[k].p_offset);
x.size = get_te64(&phdri[k].p_filesz);
if (0 == nx) { // 1st PT_LOAD64 must cover Ehdr at 0==p_offset
unsigned const delta = !is_shlib
? (sizeof(Elf64_Ehdr) + sz_phdrs) // main executable
: xct_off; // shared library
unsigned const delta = xct_off;
if (ft.id < 0x40) {
// FIXME: ?? ft.addvalue += asl_delta;
}
@ -3600,26 +3600,23 @@ void PackLinuxElf64::unpack(OutputFile *fo)
|| !mem_size_valid(1, blocksize, OVERHEAD))
throwCantUnpack("p_info corrupted");
#define MAX_ELF_HDR 1024
union {
unsigned char buf[MAX_ELF_HDR];
//struct { Elf64_Ehdr ehdr; Elf64_Phdr phdr; } e;
} u;
Elf64_Ehdr *const ehdr = (Elf64_Ehdr *) u.buf;
Elf64_Phdr const *phdr = 0;
ibuf.alloc(blocksize + OVERHEAD);
b_info bhdr; memset(&bhdr, 0, sizeof(bhdr));
fi->readx(&bhdr, szb_info);
ph.u_len = get_te32(&bhdr.sz_unc);
ph.c_len = get_te32(&bhdr.sz_cpr);
if (ph.c_len > (unsigned)file_size || ph.c_len == 0 || ph.u_len == 0
|| ph.u_len > sizeof(u))
|| ph.u_len > orig_file_size)
throwCantUnpack("b_info corrupted");
ph.filter_cto = bhdr.b_cto8;
#define MAX_ELF_HDR 1024
MemBuffer u(ph.u_len);
Elf64_Ehdr *const ehdr = (Elf64_Ehdr *)&u[0];
Elf64_Phdr const *phdr = 0;
// Uncompress Ehdr and Phdrs.
if (ibuf.getSize() < ph.c_len || sizeof(u) < ph.u_len)
if (ibuf.getSize() < ph.c_len)
throwCompressedDataViolation();
fi->readx(ibuf, ph.c_len);
decompress(ibuf, (upx_byte *)ehdr, false);
@ -3740,7 +3737,7 @@ void PackLinuxElf64::unpack(OutputFile *fo)
}
// The gaps between PT_LOAD and after last PT_LOAD
phdr = (Elf64_Phdr *) (u.buf + sizeof(*ehdr));
phdr = (Elf64_Phdr *)&u[sizeof(*ehdr)];
upx_uint64_t hi_offset(0);
for (unsigned j = 0; j < u_phnum; ++j) {
if (PT_LOAD64==phdr[j].p_type
@ -3777,7 +3774,7 @@ void PackLinuxElf64::unpack(OutputFile *fo)
if (is_shlib) { // the non-first PT_LOAD
int n_ptload = 0;
unsigned load_off = 0;
phdr = (Elf64_Phdr *) (u.buf + sizeof(*ehdr));
phdr = (Elf64_Phdr *)&u[sizeof(*ehdr)];
for (unsigned j= 0; j < u_phnum; ++j, ++phdr) {
if (PT_LOAD64==get_te32(&phdr->p_type) && 0!=n_ptload++) {
load_off = get_te64(&phdr->p_offset);
@ -3792,7 +3789,7 @@ void PackLinuxElf64::unpack(OutputFile *fo)
}
}
// Restore DT_INIT.d_val
phdr = (Elf64_Phdr *) (u.buf + sizeof(*ehdr));
phdr = (Elf64_Phdr *)&u[sizeof(*ehdr)];
for (unsigned j= 0; j < u_phnum; ++j, ++phdr) {
if (phdr->PT_DYNAMIC==get_te32(&phdr->p_type)) {
unsigned const dyn_off = get_te64(&phdr->p_offset);