/* Copyright (C) 2022 David Anderson. All Rights Reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "config.h" #include /* NULL size_t */ #include /* calloc() free() malloc() */ #if defined(_WIN32) && defined(HAVE_STDAFX_H) #include "stdafx.h" #endif /* HAVE_STDAFX_H */ #include "dwarf.h" #include "libdwarf.h" #include "libdwarf_private.h" #include "dwarf_base_types.h" #include "dwarf_opaque.h" #include "dwarf_alloc.h" #include "dwarf_die_deliv.h" #include "dwarf_abbrev.h" #include "dwarf_error.h" #include "dwarf_util.h" #include "dwarf_string.h" /* This is a pre-scan of the abbrev/form list. We will not handle DW_FORM_indirect here as that accesses data outside of the abbrev section. */ int _dwarf_fill_in_attr_form_abtable(Dwarf_CU_Context context, Dwarf_Byte_Ptr abbrev_ptr, Dwarf_Byte_Ptr abbrev_end, Dwarf_Abbrev_List abbrev_list, Dwarf_Error *error) { Dwarf_Debug dbg = 0; Dwarf_Unsigned i = 0; dbg = context->cc_dbg; abbrev_list->abl_attr = (Dwarf_Half*) calloc(abbrev_list->abl_abbrev_count, SIZEOFT16); abbrev_list->abl_form = (Dwarf_Half *) calloc(abbrev_list->abl_abbrev_count, SIZEOFT16); if (abbrev_list->abl_implicit_const_count > 0) { abbrev_list->abl_implicit_const = (Dwarf_Signed *) calloc(abbrev_list->abl_abbrev_count, sizeof(Dwarf_Signed)); if (!abbrev_list->abl_implicit_const) { dwarfstring m; dwarfstring_constructor(&m); dwarfstring_append_printf_u(&m, "DW_DLE_ALLOC_FAIL :" " Attempt to malloc space for " "abbrev_list->abl_implicit_const " "with %u entries failed.", abbrev_list->abl_abbrev_count); _dwarf_error_string(dbg,error,DW_DLE_ALLOC_FAIL, dwarfstring_string(&m)); dwarfstring_destructor(&m); return DW_DLV_ERROR; } } if (!abbrev_list->abl_attr || !abbrev_list->abl_form ) { dwarfstring m; dwarfstring_constructor(&m); dwarfstring_append_printf_u(&m, "DW_DLE_ALLOC_FAIL :" " Attempt to malloc space for " "abbrev_list->abl_attr or abl_form " "with %u entries failed.", abbrev_list->abl_abbrev_count); _dwarf_error_string(dbg,error,DW_DLE_ALLOC_FAIL, dwarfstring_string(&m)); dwarfstring_destructor(&m); return DW_DLV_ERROR; } for (i = 0; i < abbrev_list->abl_abbrev_count; ++i) { Dwarf_Unsigned attr = 0; Dwarf_Unsigned attr_form = 0; Dwarf_Signed implicit_const = 0; int res = 0; res = _dwarf_leb128_uword_wrapper(dbg, &abbrev_ptr,abbrev_end,&attr,error); if (res == DW_DLV_ERROR) { return res; } if (attr > 0xffff) { dwarfstring m; dwarfstring_constructor(&m); dwarfstring_append(&m, "DW_DLE_ATTR_FORM_SIZE_BAD :" " reading Attribute number "); dwarfstring_append(&m," for abbrev list entry" " the ULEB number is too large. Corrupt Dwarf."); _dwarf_error_string(dbg,error,DW_DLE_ATTR_FORM_SIZE_BAD, dwarfstring_string(&m)); dwarfstring_destructor(&m); return DW_DLV_ERROR; } abbrev_list->abl_attr[i] = (Dwarf_Half)attr; if (attr > DW_AT_hi_user) { _dwarf_error(dbg, error,DW_DLE_ATTR_CORRUPT); return DW_DLV_ERROR; } res = _dwarf_leb128_uword_wrapper(dbg, &abbrev_ptr,abbrev_end,&attr_form,error); if (res == DW_DLV_ERROR) { return res; } if (attr_form > 0xffff) { dwarfstring m; dwarfstring_constructor(&m); dwarfstring_append(&m, "DW_DLE_ATTR_FORM_SIZE_BAD :" " reading attr_form"); dwarfstring_append(&m,"an abbrev list entry " "the ULEB form number is too large. " "to be valid. Corrupt Dwarf."); _dwarf_error_string(dbg,error,DW_DLE_ATTR_FORM_SIZE_BAD, dwarfstring_string(&m)); dwarfstring_destructor(&m); return DW_DLV_ERROR; } if (!_dwarf_valid_form_we_know(attr_form,attr)) { dwarfstring m; dwarfstring_constructor(&m); dwarfstring_append(&m,"Reading an abbreviation list " " we find the attribute form pair to be " " impossible or unknown."); dwarfstring_append_printf_u(&m," attr 0x%x ",attr); dwarfstring_append_printf_u(&m," attrform 0x%x ", attr_form); _dwarf_error_string(dbg, error, DW_DLE_UNKNOWN_FORM, dwarfstring_string(&m)); dwarfstring_destructor(&m); return DW_DLV_ERROR; } abbrev_list->abl_attr[i] = (Dwarf_Half)attr; abbrev_list->abl_form[i] = (Dwarf_Half)attr_form; if (attr_form == DW_FORM_implicit_const) { res = _dwarf_leb128_sword_wrapper(dbg, &abbrev_ptr,abbrev_end,&implicit_const,error); if (res == DW_DLV_ERROR) { return res; } abbrev_list->abl_implicit_const_count++; abbrev_list->abl_implicit_const[i] = implicit_const; } #if 0 if (attr_form == DW_FORM_indirect) { /* Do nothing special here. Do not read from the DIE till reading for a specific DIE, which we are not intending here, we do not know where the DIE is. */ } #endif } return DW_DLV_OK; }