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Added stricter header check during unpacking.

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committer: mfx <mfx> 962126470 +0000
This commit is contained in:
Markus F.X.J. Oberhumer 2000-06-27 17:21:10 +00:00
parent 51b162f069
commit 87a1b66847
1 changed files with 27 additions and 9 deletions
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34
src/p_w32pe.cpp
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@ -113,6 +113,16 @@ const int *PackW32Pe::getFilters() const
}
bool PackW32Pe::testUnpackVersion(int version) const
{
if (version != ph_version && ph_version != -1)
throwCantUnpack("program has been modified; run a virus checker!");
if (!canUnpackVersion(version))
throwCantUnpack("this program is packed with an obsolete version and cannot be unpacked");
return true;
}
/*************************************************************************
// util
**************************************************************************/
@ -1434,11 +1444,11 @@ void PackW32Pe::pack(OutputFile *fo)
ih.flags |= RELOCS_STRIPPED;
if (memcmp(isection[0].name,"UPX",3) == 0)
throwAlreadyPacked();
throwAlreadyPackedByUPX();
if (!opt->force && (IDSIZE(15) || ih.entry > isection[1].vaddr))
throwCantPack("file is possibly packed/protected (try --force)");
if (ih.entry && ih.entry < rvamin)
throwCantPack("run a virus scanner on this file first");
throwCantPack("run a virus scanner on this file!");
if (!opt->force && ih.subsystem == 1)
throwCantPack("subsystem `native' is not supported (try --force)");
if (ih.filealign < 0x200)
@ -1515,7 +1525,7 @@ void PackW32Pe::pack(OutputFile *fo)
//fwrite(ibuf,1,usize,f1);
//fclose(f1);
// some check for broken linkers - disable filter if neccessary
// some checks for broken linkers - disable filter if neccessary
bool allow_filter = true;
if (ih.codebase == ih.database
|| ih.codebase + ih.codesize > ih.imagesize
@ -1878,7 +1888,7 @@ void PackW32Pe::pack(OutputFile *fo)
// unpack
**************************************************************************/
bool PackW32Pe::canUnpack()
int PackW32Pe::canUnpack()
{
if (!readFileHeader())
return false;
@ -1887,10 +1897,18 @@ bool PackW32Pe::canUnpack()
isection = new pe_section_t[objs];
fi->seek(pe_offset+sizeof(ih),SEEK_SET);
fi->readx(isection,sizeof(pe_section_t)*objs);
if (ih.objects < 3 || memcmp(isection[0].name,"UPX",3))
return false;
return super::readPackHeader(1024, isection[1].rawdataptr - 64) // current version
|| super::readPackHeader(1024, isection[2].rawdataptr); // old versions
if (ih.objects < 3)
return -1;
if (memcmp(isection[0].name,"UPX",3))
{
if (ih.objects == 3 && (IDSIZE(15) || ih.entry > isection[1].vaddr))
throwCantUnpack("file is possibly modified/hacked/protected; take care!");
return -1;
}
ph_format = getFormat();
bool b = readPackHeader(1024, isection[1].rawdataptr - 64) // current version
|| readPackHeader(1024, isection[2].rawdataptr); // old versions
return b ? 1 : -1;
}