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dbghelp: Protect PE's COFF table reading against bogus values in NTHEADER.

This commit is contained in:
Eric Pouech 2010-05-08 21:47:16 +02:00 committed by Alexandre Julliard
parent df710826e1
commit 516fc78a2b
1 changed files with 38 additions and 9 deletions
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29
dlls/dbghelp/pe_module.c
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@ -171,6 +171,25 @@ unsigned pe_get_map_size(const struct image_section_map* ism)
return ism->fmap->u.pe.sect[ism->sidx].shdr.SizeOfRawData; return ism->fmap->u.pe.sect[ism->sidx].shdr.SizeOfRawData;
} }
/******************************************************************
* pe_is_valid_pointer_table
*
* Checks whether the PointerToSymbolTable and NumberOfSymbols in file_header contain
* valid information.
*/
static BOOL pe_is_valid_pointer_table(const IMAGE_NT_HEADERS* nthdr, const void* mapping)
{
DWORD64 offset;
/* is the iSym table inside file image ? */
offset = (DWORD64)nthdr->FileHeader.PointerToSymbolTable;
offset += (DWORD64)nthdr->FileHeader.NumberOfSymbols * sizeof(IMAGE_SYMBOL);
if (offset > (DWORD64)nthdr->OptionalHeader.SizeOfImage) return FALSE;
/* is string table (following iSym table) inside file image ? */
offset += *(DWORD*)((const char*)mapping + offset);
return offset <= (DWORD64)nthdr->OptionalHeader.SizeOfImage;
}
/****************************************************************** /******************************************************************
* pe_map_file * pe_map_file
* *
@ -208,6 +227,8 @@ static BOOL pe_map_file(HANDLE file, struct image_file_map* fmap, enum module_ty
fmap->u.pe.sect[i].mapped = IMAGE_NO_MAP; fmap->u.pe.sect[i].mapped = IMAGE_NO_MAP;
} }
if (nthdr->FileHeader.PointerToSymbolTable && nthdr->FileHeader.NumberOfSymbols) if (nthdr->FileHeader.PointerToSymbolTable && nthdr->FileHeader.NumberOfSymbols)
{
if (pe_is_valid_pointer_table(nthdr, mapping))
{ {
/* FIXME ugly: should rather map the relevant content instead of copying it */ /* FIXME ugly: should rather map the relevant content instead of copying it */
const char* src = (const char*)mapping + const char* src = (const char*)mapping +
@ -220,6 +241,14 @@ static BOOL pe_map_file(HANDLE file, struct image_file_map* fmap, enum module_ty
memcpy(dst, src, sz); memcpy(dst, src, sz);
fmap->u.pe.strtable = dst; fmap->u.pe.strtable = dst;
} }
else
{
/* we have bad information here, wipe it out */
fmap->u.pe.ntheader.FileHeader.PointerToSymbolTable = 0;
fmap->u.pe.ntheader.FileHeader.NumberOfSymbols = 0;
fmap->u.pe.strtable = NULL;
}
}
else fmap->u.pe.strtable = NULL; else fmap->u.pe.strtable = NULL;
} }
break; break;