pe: pack() logic moved to PeFile
This commit is contained in:
László Molnár
+536
@@ -463,6 +463,7 @@ void PeFile32::processRelocs() // pass1
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info("Relocations: original size: %u bytes, preprocessed size: %u bytes",(unsigned) IDSIZE(PEDIR_RELOC),sorelocs);
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}
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// FIXME - this is too similar to PeFile32::processRelocs
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void PeFile64::processRelocs() // pass1
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{
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big_relocs = 0;
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@@ -1990,6 +1991,527 @@ unsigned PeFile::stripDebug(unsigned overlaystart)
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// pack
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**************************************************************************/
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void PeFile::readSectionHeaders(unsigned objs, unsigned sizeof_ih)
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{
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isection = new pe_section_t[objs];
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fi->seek(pe_offset+sizeof_ih,SEEK_SET);
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fi->readx(isection,sizeof(pe_section_t)*objs);
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rvamin = isection[0].vaddr;
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infoHeader("[Processing %s, format %s, %d sections]", fn_basename(fi->getName()), getName(), objs);
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}
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void PeFile::checkHeaderValues(unsigned subsystem, unsigned mask,
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unsigned ih_entry, unsigned ih_filealign)
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{
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if ((1u << subsystem) & mask)
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{
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char buf[100];
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upx_snprintf(buf, sizeof(buf), "PE: subsystem %u is not supported",
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subsystem);
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throwCantPack(buf);
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}
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//check CLR Runtime Header directory entry
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if (IDSIZE(PEDIR_COMRT))
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throwCantPack(".NET files are not yet supported");
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if (memcmp(isection[0].name,"UPX",3) == 0)
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throwAlreadyPackedByUPX();
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if (!opt->force && IDSIZE(15))
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throwCantPack("file is possibly packed/protected (try --force)");
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if (ih_entry && ih_entry < rvamin)
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throwCantPack("run a virus scanner on this file!");
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if (ih_filealign < 0x200)
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throwCantPack("filealign < 0x200 is not yet supported");
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}
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unsigned PeFile::handleStripRelocs(upx_uint64_t ih_imagebase,
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upx_uint64_t default_imagebase,
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unsigned dllflags)
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{
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if (dllflags & IMAGE_DLL_CHARACTERISTICS_DYNAMIC_BASE)
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opt->win32_pe.strip_relocs = false;
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else if (isdll) //do never strip relocations from DLLs
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opt->win32_pe.strip_relocs = false;
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else if (opt->win32_pe.strip_relocs < 0)
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opt->win32_pe.strip_relocs = (ih_imagebase >= default_imagebase);
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if (opt->win32_pe.strip_relocs)
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{
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if (ih_imagebase < default_imagebase)
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throwCantPack("--strip-relocs is not allowed with this imagebase");
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else
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return RELOCS_STRIPPED;
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}
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return 0;
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}
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unsigned PeFile::readSections(unsigned objs, unsigned usize,
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unsigned ih_filealign, unsigned ih_datasize)
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{
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const unsigned xtrasize = UPX_MAX(ih_datasize, 65536u) + IDSIZE(PEDIR_IMPORT)
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+ IDSIZE(PEDIR_BOUNDIM) + IDSIZE(PEDIR_IAT) + IDSIZE(PEDIR_DELAYIMP)
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+ IDSIZE(PEDIR_RELOC);
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ibuf.alloc(usize + xtrasize);
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// BOUND IMPORT support. FIXME: is this ok?
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fi->seek(0,SEEK_SET);
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fi->readx(ibuf,isection[0].rawdataptr);
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//Interval holes(ibuf);
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unsigned ic,jc,overlaystart = 0;
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ibuf.clear(0, usize);
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for (ic = jc = 0; ic < objs; ic++)
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{
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if (isection[ic].rawdataptr && overlaystart < isection[ic].rawdataptr + isection[ic].size)
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overlaystart = ALIGN_UP(isection[ic].rawdataptr + isection[ic].size,ih_filealign);
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if (isection[ic].vsize == 0)
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isection[ic].vsize = isection[ic].size;
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if ((isection[ic].flags & PEFL_BSS) || isection[ic].rawdataptr == 0
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|| (isection[ic].flags & PEFL_INFO))
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{
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//holes.add(isection[ic].vaddr,isection[ic].vsize);
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continue;
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}
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if (isection[ic].vaddr + isection[ic].size > usize)
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throwCantPack("section size problem");
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if (!isrtm && ((isection[ic].flags & (PEFL_WRITE|PEFL_SHARED))
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== (PEFL_WRITE|PEFL_SHARED)))
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if (!opt->force)
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throwCantPack("writable shared sections not supported (try --force)");
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if (jc && isection[ic].rawdataptr - jc > ih_filealign)
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throwCantPack("superfluous data between sections");
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fi->seek(isection[ic].rawdataptr,SEEK_SET);
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jc = isection[ic].size;
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if (jc > isection[ic].vsize)
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jc = isection[ic].vsize;
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if (isection[ic].vsize == 0) // hack for some tricky programs - may this break other progs?
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jc = isection[ic].vsize = isection[ic].size;
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if (isection[ic].vaddr + jc > ibuf.getSize())
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throwInternalError("buffer too small 1");
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fi->readx(ibuf + isection[ic].vaddr,jc);
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jc += isection[ic].rawdataptr;
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}
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return overlaystart;
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}
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void PeFile::callCompressWithFilters(Filter &ft, int filter_strategy, unsigned ih_codebase)
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{
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compressWithFilters(&ft, 2048, NULL_cconf, filter_strategy,
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ih_codebase, rvamin, 0, NULL, 0);
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}
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void PeFile::callProcessRelocs(Reloc &rel, unsigned &ic)
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{
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// wince wants relocation data at the beginning of a section
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PeFile::processRelocs(&rel);
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ODADDR(PEDIR_RELOC) = soxrelocs ? ic : 0;
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ODSIZE(PEDIR_RELOC) = soxrelocs;
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ic += soxrelocs;
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}
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void PeFile::callProcessResources(Resource &res, unsigned &ic)
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{
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if (soresources)
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processResources(&res,ic);
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ODADDR(PEDIR_RESOURCE) = soresources ? ic : 0;
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ODSIZE(PEDIR_RESOURCE) = soresources;
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ic += soresources;
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}
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template <typename LEXX, typename ht>
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void PeFile::pack0(OutputFile *fo, ht &ih, ht &oh,
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unsigned subsystem_mask, upx_uint64_t default_imagebase,
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bool last_section_rsrc_only)
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{
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// FIXME: we need to think about better support for --exact
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if (opt->exact)
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throwCantPackExact();
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const unsigned objs = ih.objects;
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readSectionHeaders(objs, sizeof(ih));
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if (!opt->force && handleForceOption())
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throwCantPack("unexpected value in PE header (try --force)");
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checkHeaderValues(ih.subsystem, subsystem_mask, ih.entry, ih.filealign);
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//remove certificate directory entry
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if (IDSIZE(PEDIR_SEC))
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IDSIZE(PEDIR_SEC) = IDADDR(PEDIR_SEC) = 0;
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ih.flags |= handleStripRelocs(ih.imagebase, default_imagebase, ih.dllflags);
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handleStub(fi,fo,pe_offset);
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unsigned overlaystart = readSections(objs, ih.imagesize, ih.filealign, ih.datasize);
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unsigned overlay = file_size - stripDebug(overlaystart);
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if (overlay >= (unsigned) file_size)
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overlay = 0;
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checkOverlay(overlay);
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Resource res;
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Interval tlsiv(ibuf);
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Interval loadconfiv(ibuf);
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Export xport((char*)(unsigned char*)ibuf);
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const unsigned dllstrings = processImports();
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processTls(&tlsiv); // call before processRelocs!!
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processLoadConf(&loadconfiv);
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processResources(&res);
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processExports(&xport);
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processRelocs();
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//OutputFile::dump("x1", ibuf, usize);
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// some checks for broken linkers - disable filter if necessary
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bool allow_filter = true;
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if (/*FIXME ih.codebase == ih.database
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||*/ ih.codebase + ih.codesize > ih.imagesize
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|| (isection[virta2objnum(ih.codebase,isection,objs)].flags & PEFL_CODE) == 0)
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allow_filter = false;
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const unsigned oam1 = ih.objectalign - 1;
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// FIXME: disabled: the uncompressor would not allocate enough memory
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//objs = tryremove(IDADDR(PEDIR_RELOC),objs);
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// FIXME: if the last object has a bss then this won't work
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// newvsize = (isection[objs-1].vaddr + isection[objs-1].size + oam1) &~ oam1;
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// temporary solution:
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unsigned newvsize = (isection[objs-1].vaddr + isection[objs-1].vsize + oam1) &~ oam1;
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//fprintf(stderr,"newvsize=%x objs=%d\n",newvsize,objs);
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if (newvsize + soimport + sorelocs > ibuf.getSize())
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throwInternalError("buffer too small 2");
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memcpy(ibuf+newvsize,oimport,soimport);
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memcpy(ibuf+newvsize+soimport,orelocs,sorelocs);
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cimports = newvsize - rvamin; // rva of preprocessed imports
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crelocs = cimports + soimport; // rva of preprocessed fixups
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ph.u_len = newvsize + soimport + sorelocs;
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// some extra data for uncompression support
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unsigned s = 0;
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upx_byte * const p1 = ibuf + ph.u_len;
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memcpy(p1 + s,&ih,sizeof (ih));
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s += sizeof (ih);
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memcpy(p1 + s,isection,ih.objects * sizeof(*isection));
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s += ih.objects * sizeof(*isection);
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if (soimport)
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{
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set_le32(p1 + s,cimports);
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set_le32(p1 + s + 4,dllstrings);
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s += 8;
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}
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if (sorelocs)
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{
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set_le32(p1 + s,crelocs);
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p1[s + 4] = (unsigned char) (big_relocs & 6);
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s += 5;
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}
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if (soresources)
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{
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set_le16(p1 + s,icondir_count);
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s += 2;
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}
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// end of extra data
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set_le32(p1 + s,ptr_diff(p1,ibuf) - rvamin);
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s += 4;
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ph.u_len += s;
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obuf.allocForCompression(ph.u_len);
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// prepare packheader
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ph.u_len -= rvamin;
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// prepare filter
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Filter ft(ph.level);
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ft.buf_len = ih.codesize;
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ft.addvalue = ih.codebase - rvamin;
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// compress
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int filter_strategy = allow_filter ? 0 : -3;
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// disable filters for files with broken headers
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if (ih.codebase + ih.codesize > ph.u_len)
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{
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ft.buf_len = 1;
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filter_strategy = -3;
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}
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callCompressWithFilters(ft, filter_strategy, ih.codebase);
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// info: see buildLoader()
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newvsize = (ph.u_len + rvamin + ph.overlap_overhead + oam1) &~ oam1;
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if (tlsindex && ((newvsize - ph.c_len - 1024 + oam1) &~ oam1) > tlsindex + 4)
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tlsindex = 0;
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int identsize = 0;
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const unsigned codesize = getLoaderSection("IDENTSTR",&identsize);
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assert(identsize > 0);
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unsigned ic;
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getLoaderSection("UPX1HEAD",(int*)&ic);
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identsize += ic;
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const unsigned oobjs = last_section_rsrc_only ? 4 : 3;
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pe_section_t osection[oobjs];
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// section 0 : bss
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// 1 : [ident + header] + packed_data + unpacker + tls + loadconf
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// 2 : not compressed data
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// 3 : resource data -- wince 5 needs a new section for this
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// the last section should start with the resource data, because lots of lame
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// windoze codes assume that resources starts on the beginning of a section
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// note: there should be no data in the last section which needs fixup
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// identsplit - number of ident + (upx header) bytes to put into the PE header
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int identsplit = pe_offset + sizeof(osection) + sizeof(oh);
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if ((identsplit & 0x1ff) == 0)
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identsplit = 0;
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else if (((identsplit + identsize) ^ identsplit) < 0x200)
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identsplit = identsize;
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else
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identsplit = ALIGN_GAP(identsplit, 0x200);
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ic = identsize - identsplit;
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const unsigned c_len = ((ph.c_len + ic) & 15) == 0 ? ph.c_len : ph.c_len + 16 - ((ph.c_len + ic) & 15);
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obuf.clear(ph.c_len, c_len - ph.c_len);
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const unsigned s1size = ALIGN_UP(ic + c_len + codesize, (unsigned) sizeof(LEXX)) + sotls + soloadconf;
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const unsigned s1addr = (newvsize - (ic + c_len) + oam1) &~ oam1;
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const unsigned ncsection = (s1addr + s1size + oam1) &~ oam1;
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const unsigned upxsection = s1addr + ic + c_len;
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Reloc rel(1024); // new relocations are put here
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addNewRelocations(rel, upxsection);
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// new PE header
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memcpy(&oh,&ih,sizeof(oh));
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oh.filealign = 0x200; // identsplit depends on this
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memset(osection,0,sizeof(osection));
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oh.entry = upxsection;
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oh.objects = oobjs;
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oh.chksum = 0;
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// fill the data directory
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ODADDR(PEDIR_DEBUG) = 0;
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ODSIZE(PEDIR_DEBUG) = 0;
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ODADDR(PEDIR_IAT) = 0;
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ODSIZE(PEDIR_IAT) = 0;
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ODADDR(PEDIR_BOUNDIM) = 0;
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ODSIZE(PEDIR_BOUNDIM) = 0;
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// tls & loadconf are put into section 1
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ic = s1addr + s1size - sotls - soloadconf;
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processTls(&rel,&tlsiv,ic);
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ODADDR(PEDIR_TLS) = sotls ? ic : 0;
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ODSIZE(PEDIR_TLS) = sotls ? (sizeof(LEXX) == 4 ? 0x18 : 0x28) : 0;
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ic += sotls;
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processLoadConf(&rel, &loadconfiv, ic);
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ODADDR(PEDIR_LOADCONF) = soloadconf ? ic : 0;
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ODSIZE(PEDIR_LOADCONF) = soloadconf;
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ic += soloadconf;
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const bool rel_at_sections_start = oobjs == 4;
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ic = ncsection;
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if (!last_section_rsrc_only)
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callProcessResources(res, ic);
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if (rel_at_sections_start)
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callProcessRelocs(rel, ic);
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PeFile::processImports(ic, getProcessImportParam(upxsection));
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ODADDR(PEDIR_IMPORT) = ic;
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ODSIZE(PEDIR_IMPORT) = soimpdlls;
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ic += soimpdlls;
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processExports(&xport,ic);
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ODADDR(PEDIR_EXPORT) = soexport ? ic : 0;
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ODSIZE(PEDIR_EXPORT) = soexport;
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if (!isdll && opt->win32_pe.compress_exports)
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{
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ODADDR(PEDIR_EXPORT) = IDADDR(PEDIR_EXPORT);
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ODSIZE(PEDIR_EXPORT) = IDSIZE(PEDIR_EXPORT);
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}
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ic += soexport;
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if (!rel_at_sections_start)
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callProcessRelocs(rel, ic);
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// when the resource is put alone into section 3
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const unsigned res_start = (ic + oam1) &~ oam1;;
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if (last_section_rsrc_only)
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callProcessResources(res, ic);
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defineSymbols(ncsection, upxsection, sizeof(oh),
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identsize - identsplit, rel, s1addr);
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defineFilterSymbols(&ft);
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relocateLoader();
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const unsigned lsize = getLoaderSize();
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MemBuffer loader(lsize);
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memcpy(loader,getLoader(),lsize);
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patchPackHeader(loader, lsize);
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const unsigned ncsize = soxrelocs + soimpdlls + soexport
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+ (!last_section_rsrc_only ? soresources : 0);
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const unsigned fam1 = oh.filealign - 1;
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// this one is tricky: it seems windoze touches 4 bytes after
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// the end of the relocation data - so we have to increase
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// the virtual size of this section
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const unsigned ncsize_virt_increase = (ncsize & oam1) == 0 ? 8 : 0;
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// fill the sections
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strcpy(osection[0].name,"UPX0");
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strcpy(osection[1].name,"UPX1");
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// after some windoze debugging I found that the name of the sections
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// DOES matter :( .rsrc is used by oleaut32.dll (TYPELIBS)
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// and because of this lame dll, the resource stuff must be the
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// first in the 3rd section - the author of this dll seems to be
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// too idiot to use the data directories... M$ suxx 4 ever!
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// ... even worse: exploder.exe in NiceTry also depends on this to
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// locate version info
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strcpy(osection[2].name, !last_section_rsrc_only && soresources ? ".rsrc" : "UPX2");
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osection[0].vaddr = rvamin;
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osection[1].vaddr = s1addr;
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osection[2].vaddr = ncsection;
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osection[0].size = 0;
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osection[1].size = (s1size + fam1) &~ fam1;
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osection[2].size = (ncsize + fam1) &~ fam1;
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osection[0].vsize = osection[1].vaddr - osection[0].vaddr;
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if (oobjs == 3)
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{
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osection[1].vsize = (osection[1].size + oam1) &~ oam1;
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osection[2].vsize = (osection[2].size + ncsize_virt_increase + oam1) &~ oam1;
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oh.imagesize = (osection[3].vaddr + osection[3].vsize + oam1) &~ oam1;
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osection[0].rawdataptr = (pe_offset + sizeof(oh) + sizeof(osection) + fam1) &~ fam1;
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osection[1].rawdataptr = osection[0].rawdataptr;
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osection[2].rawdataptr = osection[1].rawdataptr + osection[1].size;
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}
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else
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{
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osection[1].vsize = osection[1].size;
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osection[2].vsize = osection[2].size;
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oh.imagesize = osection[2].vaddr + osection[2].vsize;
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osection[0].rawdataptr = 0;
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||||
osection[1].rawdataptr = (pe_offset + sizeof(oh) + sizeof(osection) + fam1) &~ fam1;
|
||||
}
|
||||
osection[2].rawdataptr = osection[1].rawdataptr + osection[1].size;
|
||||
|
||||
osection[0].flags = (unsigned) (PEFL_BSS|PEFL_EXEC|PEFL_WRITE|PEFL_READ);
|
||||
osection[1].flags = (unsigned) (PEFL_DATA|PEFL_EXEC|PEFL_WRITE|PEFL_READ);
|
||||
osection[2].flags = (unsigned) (PEFL_DATA|PEFL_WRITE|PEFL_READ);
|
||||
|
||||
if (oobjs == 4)
|
||||
{
|
||||
strcpy(osection[3].name, ".rsrc");
|
||||
osection[3].vaddr = res_start;
|
||||
osection[3].size = (soresources + fam1) &~ fam1;
|
||||
osection[3].vsize = osection[3].size;
|
||||
osection[3].rawdataptr = osection[2].rawdataptr + osection[2].size;
|
||||
osection[2].flags = (unsigned) (PEFL_DATA|PEFL_READ);
|
||||
osection[3].flags = (unsigned) (PEFL_DATA|PEFL_READ);
|
||||
if (soresources == 0)
|
||||
{
|
||||
oh.objects = 3;
|
||||
memset(&osection[3], 0, sizeof(osection[3]));
|
||||
}
|
||||
}
|
||||
|
||||
oh.bsssize = osection[0].vsize;
|
||||
oh.datasize = osection[2].vsize + (oobjs > 3 ? osection[3].vsize : 0);
|
||||
setOhDataBase(osection);
|
||||
oh.codesize = osection[1].vsize;
|
||||
oh.codebase = osection[1].vaddr;
|
||||
setOhHeaderSize(osection);
|
||||
if (rvamin < osection[0].rawdataptr)
|
||||
throwCantPack("object alignment too small");
|
||||
|
||||
if (opt->win32_pe.strip_relocs && !isdll)
|
||||
oh.flags |= RELOCS_STRIPPED;
|
||||
|
||||
//for (ic = 0; ic < oh.filealign; ic += 4)
|
||||
// set_le32(ibuf + ic,get_le32("UPX "));
|
||||
ibuf.clear(0, oh.filealign);
|
||||
|
||||
info("Image size change: %u -> %u KiB",
|
||||
ih.imagesize / 1024, oh.imagesize / 1024);
|
||||
|
||||
infoHeader("[Writing compressed file]");
|
||||
|
||||
// write loader + compressed file
|
||||
fo->write(&oh,sizeof(oh));
|
||||
fo->write(osection,sizeof(osection));
|
||||
// some alignment
|
||||
if (identsplit == identsize)
|
||||
{
|
||||
unsigned n = osection[oobjs == 3 ? 0 : 1].rawdataptr - fo->getBytesWritten() - identsize;
|
||||
assert(n <= oh.filealign);
|
||||
fo->write(ibuf, n);
|
||||
}
|
||||
fo->write(loader + codesize,identsize);
|
||||
infoWriting("loader", fo->getBytesWritten());
|
||||
fo->write(obuf,c_len);
|
||||
infoWriting("compressed data", c_len);
|
||||
fo->write(loader,codesize);
|
||||
if (opt->debug.dump_stub_loader)
|
||||
OutputFile::dump(opt->debug.dump_stub_loader, loader, codesize);
|
||||
if ((ic = fo->getBytesWritten() & (sizeof(LEXX) - 1)) != 0)
|
||||
fo->write(ibuf, sizeof(LEXX) - ic);
|
||||
fo->write(otls,sotls);
|
||||
fo->write(oloadconf, soloadconf);
|
||||
if ((ic = fo->getBytesWritten() & fam1) != 0)
|
||||
fo->write(ibuf,oh.filealign - ic);
|
||||
if (!last_section_rsrc_only)
|
||||
fo->write(oresources,soresources);
|
||||
else
|
||||
fo->write(oxrelocs,soxrelocs);
|
||||
fo->write(oimpdlls,soimpdlls);
|
||||
fo->write(oexport,soexport);
|
||||
fo->write(oxrelocs,soxrelocs);
|
||||
if (!last_section_rsrc_only)
|
||||
fo->write(oxrelocs,soxrelocs);
|
||||
|
||||
if ((ic = fo->getBytesWritten() & fam1) != 0)
|
||||
fo->write(ibuf,oh.filealign - ic);
|
||||
|
||||
if (last_section_rsrc_only)
|
||||
{
|
||||
fo->write(oresources,soresources);
|
||||
if ((ic = fo->getBytesWritten() & fam1) != 0)
|
||||
fo->write(ibuf,oh.filealign - ic);
|
||||
}
|
||||
|
||||
#if 0
|
||||
printf("%-13s: program hdr : %8ld bytes\n", getName(), (long) sizeof(oh));
|
||||
printf("%-13s: sections : %8ld bytes\n", getName(), (long) sizeof(osection));
|
||||
printf("%-13s: ident : %8ld bytes\n", getName(), (long) identsize);
|
||||
printf("%-13s: compressed : %8ld bytes\n", getName(), (long) c_len);
|
||||
printf("%-13s: decompressor : %8ld bytes\n", getName(), (long) codesize);
|
||||
printf("%-13s: tls : %8ld bytes\n", getName(), (long) sotls);
|
||||
printf("%-13s: resources : %8ld bytes\n", getName(), (long) soresources);
|
||||
printf("%-13s: imports : %8ld bytes\n", getName(), (long) soimpdlls);
|
||||
printf("%-13s: exports : %8ld bytes\n", getName(), (long) soexport);
|
||||
printf("%-13s: relocs : %8ld bytes\n", getName(), (long) soxrelocs);
|
||||
printf("%-13s: loadconf : %8ld bytes\n", getName(), (long) soloadconf);
|
||||
#endif
|
||||
|
||||
// verify
|
||||
verifyOverlappingDecompression();
|
||||
|
||||
// copy the overlay
|
||||
copyOverlay(fo, overlay, &obuf);
|
||||
|
||||
// finally check the compression ratio
|
||||
if (!checkFinalCompressionRatio(fo))
|
||||
throwNotCompressible();
|
||||
}
|
||||
|
||||
/*************************************************************************
|
||||
// unpack
|
||||
@@ -2454,6 +2976,14 @@ void PeFile32::readPeHeader()
|
||||
isdll = ((ih.flags & DLL_FLAG) != 0);
|
||||
}
|
||||
|
||||
void PeFile32::pack0(OutputFile *fo, unsigned subsystem_mask,
|
||||
upx_uint64_t default_imagebase,
|
||||
bool last_section_rsrc_only)
|
||||
{
|
||||
super::pack0<LE32>(fo, ih, oh, subsystem_mask,
|
||||
default_imagebase, last_section_rsrc_only);
|
||||
}
|
||||
|
||||
void PeFile32::unpack(OutputFile *fo)
|
||||
{
|
||||
bool set_oft = getFormat() == UPX_F_WINCE_ARM_PE;
|
||||
@@ -2503,6 +3033,12 @@ void PeFile64::readPeHeader()
|
||||
isdll = ((ih.flags & DLL_FLAG) != 0);
|
||||
}
|
||||
|
||||
void PeFile64::pack0(OutputFile *fo, unsigned subsystem_mask,
|
||||
upx_uint64_t default_imagebase)
|
||||
{
|
||||
super::pack0<LE64>(fo, ih, oh, subsystem_mask, default_imagebase, false);
|
||||
}
|
||||
|
||||
void PeFile64::unpack(OutputFile *fo)
|
||||
{
|
||||
super::unpack<pe_header_t, LE64>(fo, ih, oh, 1ULL << 63, false);
|
||||
|
||||
Reference in New Issue
Block a user