Sign Up
Log In
Log In
or
Sign Up
Places
All Projects
Status Monitor
Collapse sidebar
home:Obesotoma
elfutils-libelf
elfutils-0.131-rh-robustify.diff
Overview
Repositories
Revisions
Requests
Users
Attributes
Meta
File elfutils-0.131-rh-robustify.diff of Package elfutils-libelf
src/ 2005-06-09 Roland McGrath <roland@redhat.com> * readelf.c (handle_dynamic, handle_symtab): Check for bogus sh_link. (handle_verneed, handle_verdef, handle_versym, handle_hash): Likewise. (handle_scngrp): Check for bogus sh_info. * strip.c (handle_elf): Check for bogus values in sh_link, sh_info, st_shndx, e_shstrndx, and SHT_GROUP or SHT_SYMTAB_SHNDX data. Don't use assert on input values, instead bail with "illformed" error. 2005-05-17 Jakub Jelinek <jakub@redhat.com> libelf/ * elf32_getphdr.c (elfw2(LIBELFBITS,getphdr)): Check if program header table fits into object's bounds. * elf_getshstrndx.c (elf_getshstrndx): Add elf->start_offset to elf->map_address. Check if first section header fits into object's bounds. * elf32_getshdr.c (elfw2(LIBELFBITS,getshdr)): Check if section header table fits into object's bounds. * elf_begin.c (get_shnum): Ensure section headers fits into object's bounds. (file_read_elf): Make sure scncnt is small enough to allocate both ElfXX_Shdr and Elf_Scn array. Make sure section and program header tables fit into object's bounds. Avoid memory leak on failure. src/ * elflint.c (check_hash): Don't check entries beyond end of section. (check_note): Don't crash if gelf_rawchunk fails. (section_name): Return <invalid> if gelf_getshdr returns NULL. 2005-05-14 Jakub Jelinek <jakub@redhat.com> libelf/ * libelfP.h (INVALID_NDX): Define. * gelf_getdyn.c (gelf_getdyn): Use it. Remove ndx < 0 test if any. * gelf_getlib.c (gelf_getlib): Likewise. * gelf_getmove.c (gelf_getmove): Likewise. * gelf_getrel.c (gelf_getrel): Likewise. * gelf_getrela.c (gelf_getrela): Likewise. * gelf_getsym.c (gelf_getsym): Likewise. * gelf_getsyminfo.c (gelf_getsyminfo): Likewise. * gelf_getsymshndx.c (gelf_getsymshndx): Likewise. * gelf_getversym.c (gelf_getversym): Likewise. * gelf_update_dyn.c (gelf_update_dyn): Likewise. * gelf_update_lib.c (gelf_update_lib): Likewise. * gelf_update_move.c (gelf_update_move): Likewise. * gelf_update_rel.c (gelf_update_rel): Likewise. * gelf_update_rela.c (gelf_update_rela): Likewise. * gelf_update_sym.c (gelf_update_sym): Likewise. * gelf_update_syminfo.c (gelf_update_syminfo): Likewise. * gelf_update_symshndx.c (gelf_update_symshndx): Likewise. * gelf_update_versym.c (gelf_update_versym): Likewise. * elf_newscn.c (elf_newscn): Check for overflow. * elf32_updatefile.c (__elfw2(LIBELFBITS,updatemmap)): Likewise. (__elfw2(LIBELFBITS,updatefile)): Likewise. * elf_begin.c (file_read_elf): Likewise. * elf32_newphdr.c (elfw2(LIBELFBITS,newphdr)): Likewise. * elf_getarsym.c (elf_getarsym): Likewise. * elf32_getshdr.c (elfw2(LIBELFBITS,getshdr)): Likewise. src/ * elflint.c (section_name): Return "<invalid>" instead of crashing on invalid section name. (check_symtab, is_rel_dyn, check_rela, check_rel, check_dynamic, check_symtab_shndx, check_hash, check_versym): Robustify. --- elfutils-0.130/src/readelf.c.robustify +++ elfutils-0.130/src/readelf.c @@ -1053,6 +1053,8 @@ handle_scngrp (Ebl *ebl, Elf_Scn *scn, G Elf32_Word *grpref = (Elf32_Word *) data->d_buf; GElf_Sym sym_mem; + GElf_Sym *sym = gelf_getsym (symdata, shdr->sh_info, &sym_mem); + printf ((grpref[0] & GRP_COMDAT) ? ngettext ("\ \nCOMDAT section group [%2zu] '%s' with signature '%s' contains %zu entry:\n", @@ -1065,8 +1067,8 @@ handle_scngrp (Ebl *ebl, Elf_Scn *scn, G data->d_size / sizeof (Elf32_Word) - 1), elf_ndxscn (scn), elf_strptr (ebl->elf, shstrndx, shdr->sh_name), - elf_strptr (ebl->elf, symshdr->sh_link, - gelf_getsym (symdata, shdr->sh_info, &sym_mem)->st_name) + (sym == NULL ? NULL + : elf_strptr (ebl->elf, symshdr->sh_link, sym->st_name)) ?: gettext ("<INVALID SYMBOL>"), data->d_size / sizeof (Elf32_Word) - 1); @@ -1217,7 +1219,8 @@ static void handle_dynamic (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr) { int class = gelf_getclass (ebl->elf); - GElf_Shdr glink; + GElf_Shdr glink_mem; + GElf_Shdr *glink; Elf_Data *data; size_t cnt; size_t shstrndx; @@ -1232,6 +1235,11 @@ handle_dynamic (Ebl *ebl, Elf_Scn *scn, error (EXIT_FAILURE, 0, gettext ("cannot get section header string table index")); + glink = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), &glink_mem); + if (glink == NULL) + error (EXIT_FAILURE, 0, gettext ("invalid sh_link value in section %Zu"), + elf_ndxscn (scn)); + printf (ngettext ("\ \nDynamic segment contains %lu entry:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'\n", "\ @@ -1241,9 +1249,7 @@ handle_dynamic (Ebl *ebl, Elf_Scn *scn, class == ELFCLASS32 ? 10 : 18, shdr->sh_addr, shdr->sh_offset, (int) shdr->sh_link, - elf_strptr (ebl->elf, shstrndx, - gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), - &glink)->sh_name)); + elf_strptr (ebl->elf, shstrndx, glink->sh_name)); fputs_unlocked (gettext (" Type Value\n"), stdout); for (cnt = 0; cnt < shdr->sh_size / shdr->sh_entsize; ++cnt) @@ -1761,6 +1767,13 @@ handle_symtab (Ebl *ebl, Elf_Scn *scn, G error (EXIT_FAILURE, 0, gettext ("cannot get section header string table index")); + GElf_Shdr glink_mem; + GElf_Shdr *glink = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), + &glink_mem); + if (glink == NULL) + error (EXIT_FAILURE, 0, gettext ("invalid sh_link value in section %Zu"), + elf_ndxscn (scn)); + /* Now we can compute the number of entries in the section. */ unsigned int nsyms = data->d_size / (class == ELFCLASS32 ? sizeof (Elf32_Sym) @@ -1771,15 +1784,12 @@ handle_symtab (Ebl *ebl, Elf_Scn *scn, G nsyms), (unsigned int) elf_ndxscn (scn), elf_strptr (ebl->elf, shstrndx, shdr->sh_name), nsyms); - GElf_Shdr glink; printf (ngettext (" %lu local symbol String table: [%2u] '%s'\n", " %lu local symbols String table: [%2u] '%s'\n", shdr->sh_info), (unsigned long int) shdr->sh_info, (unsigned int) shdr->sh_link, - elf_strptr (ebl->elf, shstrndx, - gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), - &glink)->sh_name)); + elf_strptr (ebl->elf, shstrndx, glink->sh_name)); fputs_unlocked (class == ELFCLASS32 ? gettext ("\ @@ -2015,7 +2025,13 @@ handle_verneed (Ebl *ebl, Elf_Scn *scn, error (EXIT_FAILURE, 0, gettext ("cannot get section header string table index")); - GElf_Shdr glink; + GElf_Shdr glink_mem; + GElf_Shdr *glink = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), + &glink_mem); + if (glink == NULL) + error (EXIT_FAILURE, 0, gettext ("invalid sh_link value in section %Zu"), + elf_ndxscn (scn)); + printf (ngettext ("\ \nVersion needs section [%2u] '%s' contains %d entry:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'\n", "\ @@ -2026,9 +2042,7 @@ handle_verneed (Ebl *ebl, Elf_Scn *scn, class == ELFCLASS32 ? 10 : 18, shdr->sh_addr, shdr->sh_offset, (unsigned int) shdr->sh_link, - elf_strptr (ebl->elf, shstrndx, - gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), - &glink)->sh_name)); + elf_strptr (ebl->elf, shstrndx, glink->sh_name)); unsigned int offset = 0; for (int cnt = shdr->sh_info; --cnt >= 0; ) @@ -2081,8 +2095,14 @@ handle_verdef (Ebl *ebl, Elf_Scn *scn, G error (EXIT_FAILURE, 0, gettext ("cannot get section header string table index")); + GElf_Shdr glink_mem; + GElf_Shdr *glink = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), + &glink_mem); + if (glink == NULL) + error (EXIT_FAILURE, 0, gettext ("invalid sh_link value in section %Zu"), + elf_ndxscn (scn)); + int class = gelf_getclass (ebl->elf); - GElf_Shdr glink; printf (ngettext ("\ \nVersion definition section [%2u] '%s' contains %d entry:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'\n", "\ @@ -2094,9 +2114,7 @@ handle_verdef (Ebl *ebl, Elf_Scn *scn, G class == ELFCLASS32 ? 10 : 18, shdr->sh_addr, shdr->sh_offset, (unsigned int) shdr->sh_link, - elf_strptr (ebl->elf, shstrndx, - gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), - &glink)->sh_name)); + elf_strptr (ebl->elf, shstrndx, glink->sh_name)); unsigned int offset = 0; for (int cnt = shdr->sh_info; --cnt >= 0; ) @@ -2358,8 +2376,14 @@ handle_versym (Ebl *ebl, Elf_Scn *scn, G filename = NULL; } + GElf_Shdr glink_mem; + GElf_Shdr *glink = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), + &glink_mem); + if (glink == NULL) + error (EXIT_FAILURE, 0, gettext ("invalid sh_link value in section %Zu"), + elf_ndxscn (scn)); + /* Print the header. */ - GElf_Shdr glink; printf (ngettext ("\ \nVersion symbols section [%2u] '%s' contains %d entry:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'", "\ @@ -2371,9 +2395,7 @@ handle_versym (Ebl *ebl, Elf_Scn *scn, G class == ELFCLASS32 ? 10 : 18, shdr->sh_addr, shdr->sh_offset, (unsigned int) shdr->sh_link, - elf_strptr (ebl->elf, shstrndx, - gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), - &glink)->sh_name)); + elf_strptr (ebl->elf, shstrndx, glink->sh_name)); /* Now we can finally look at the actual contents of this section. */ for (unsigned int cnt = 0; cnt < shdr->sh_size / shdr->sh_entsize; ++cnt) @@ -2425,7 +2447,17 @@ print_hash_info (Ebl *ebl, Elf_Scn *scn, for (Elf32_Word cnt = 0; cnt < nbucket; ++cnt) ++counts[lengths[cnt]]; - GElf_Shdr glink; + GElf_Shdr glink_mem; + GElf_Shdr *glink = gelf_getshdr (elf_getscn (ebl->elf, + shdr->sh_link), + &glink_mem); + if (glink == NULL) + { + error (0, 0, gettext ("invalid sh_link value in section %Zu"), + elf_ndxscn (scn)); + return; + } + printf (ngettext ("\ \nHistogram for bucket list length in section [%2u] '%s' (total of %d bucket):\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'\n", "\ @@ -2438,9 +2470,7 @@ print_hash_info (Ebl *ebl, Elf_Scn *scn, shdr->sh_addr, shdr->sh_offset, (unsigned int) shdr->sh_link, - elf_strptr (ebl->elf, shstrndx, - gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), - &glink)->sh_name)); + elf_strptr (ebl->elf, shstrndx, glink->sh_name)); if (extrastr != NULL) fputs (extrastr, stdout); @@ -3834,6 +3864,16 @@ print_debug_aranges_section (Dwfl_Module return; } + GElf_Shdr glink_mem; + GElf_Shdr *glink; + glink = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), &glink_mem); + if (glink == NULL) + { + error (0, 0, gettext ("invalid sh_link value in section %Zu"), + elf_ndxscn (scn)); + return; + } + printf (ngettext ("\ \nDWARF section '%s' at offset %#" PRIx64 " contains %zu entry:\n", "\ --- elfutils-0.128/src/strip.c.orig +++ elfutils-0.128/src/strip.c @@ -413,6 +413,7 @@ handle_elf (int fd, Elf *elf, const char Elf_Data debuglink_crc_data; bool any_symtab_changes = false; Elf_Data *shstrtab_data = NULL; + size_t shdridx = 0; /* Create the full name of the file. */ if (prefix != NULL) @@ -543,6 +544,11 @@ handle_elf (int fd, Elf *elf, const char goto fail_close; } + if (shstrndx >= shnum) + goto illformed; + +#define elf_assert(test) do { if (!(test)) goto illformed; } while (0) + /* Storage for section information. We leave room for two more entries since we unconditionally create a section header string table. Maybe some weird tool created an ELF file without one. @@ -564,7 +570,7 @@ handle_elf (int fd, Elf *elf, const char { /* This should always be true (i.e., there should not be any holes in the numbering). */ - assert (elf_ndxscn (scn) == cnt); + elf_assert (elf_ndxscn (scn) == cnt); shdr_info[cnt].scn = scn; @@ -577,6 +583,7 @@ handle_elf (int fd, Elf *elf, const char shdr_info[cnt].shdr.sh_name); if (shdr_info[cnt].name == NULL) { + illformed: error (0, 0, gettext ("illformed file '%s'"), fname); goto fail_close; } @@ -586,6 +593,8 @@ handle_elf (int fd, Elf *elf, const char /* Remember the shdr.sh_link value. */ shdr_info[cnt].old_sh_link = shdr_info[cnt].shdr.sh_link; + if (shdr_info[cnt].old_sh_link >= shnum) + goto illformed; /* Sections in files other than relocatable object files which are not loaded can be freely moved by us. In relocatable @@ -598,7 +607,7 @@ handle_elf (int fd, Elf *elf, const char appropriate reference. */ if (unlikely (shdr_info[cnt].shdr.sh_type == SHT_SYMTAB_SHNDX)) { - assert (shdr_info[shdr_info[cnt].shdr.sh_link].symtab_idx == 0); + elf_assert (shdr_info[shdr_info[cnt].shdr.sh_link].symtab_idx == 0); shdr_info[shdr_info[cnt].shdr.sh_link].symtab_idx = cnt; } else if (unlikely (shdr_info[cnt].shdr.sh_type == SHT_GROUP)) @@ -615,7 +624,12 @@ handle_elf (int fd, Elf *elf, const char for (inner = 1; inner < shdr_info[cnt].data->d_size / sizeof (Elf32_Word); ++inner) + { + if (grpref[inner] < shnum) shdr_info[grpref[inner]].group_idx = cnt; + else + goto illformed; + } if (inner == 1 || (inner == 2 && (grpref[0] & GRP_COMDAT) == 0)) /* If the section group contains only one element and this @@ -626,7 +640,7 @@ handle_elf (int fd, Elf *elf, const char } else if (unlikely (shdr_info[cnt].shdr.sh_type == SHT_GNU_versym)) { - assert (shdr_info[shdr_info[cnt].shdr.sh_link].version_idx == 0); + elf_assert (shdr_info[shdr_info[cnt].shdr.sh_link].version_idx == 0); shdr_info[shdr_info[cnt].shdr.sh_link].version_idx = cnt; } @@ -634,7 +648,7 @@ handle_elf (int fd, Elf *elf, const char discarded right away. */ if ((shdr_info[cnt].shdr.sh_flags & SHF_GROUP) != 0) { - assert (shdr_info[cnt].group_idx != 0); + elf_assert (shdr_info[cnt].group_idx != 0); if (shdr_info[shdr_info[cnt].group_idx].idx == 0) { @@ -709,11 +723,15 @@ handle_elf (int fd, Elf *elf, const char { /* If a relocation section is marked as being removed make sure the section it is relocating is removed, too. */ - if ((shdr_info[cnt].shdr.sh_type == SHT_REL + if (shdr_info[cnt].shdr.sh_type == SHT_REL || shdr_info[cnt].shdr.sh_type == SHT_RELA) - && shdr_info[shdr_info[cnt].shdr.sh_info].idx != 0) + { + if (shdr_info[cnt].shdr.sh_info >= shnum) + goto illformed; + else if (shdr_info[shdr_info[cnt].shdr.sh_info].idx != 0) shdr_info[cnt].idx = 1; } + } if (shdr_info[cnt].idx == 1) { @@ -738,7 +756,7 @@ handle_elf (int fd, Elf *elf, const char if (shdr_info[cnt].symtab_idx != 0 && shdr_info[shdr_info[cnt].symtab_idx].data == NULL) { - assert (shdr_info[cnt].shdr.sh_type == SHT_SYMTAB); + elf_assert (shdr_info[cnt].shdr.sh_type == SHT_SYMTAB); shdr_info[shdr_info[cnt].symtab_idx].data = elf_getdata (shdr_info[shdr_info[cnt].symtab_idx].scn, @@ -778,6 +796,9 @@ handle_elf (int fd, Elf *elf, const char else if (scnidx == SHN_XINDEX) scnidx = xndx; + if (scnidx >= shnum) + goto illformed; + if (shdr_info[scnidx].idx == 0) { /* Mark this section as used. */ @@ -809,12 +830,16 @@ handle_elf (int fd, Elf *elf, const char } /* Handle references through sh_info. */ - if (SH_INFO_LINK_P (&shdr_info[cnt].shdr) - && shdr_info[shdr_info[cnt].shdr.sh_info].idx == 0) + if (SH_INFO_LINK_P (&shdr_info[cnt].shdr)) + { + if (shdr_info[cnt].shdr.sh_info >= shnum) + goto illformed; + else if ( shdr_info[shdr_info[cnt].shdr.sh_info].idx == 0) { shdr_info[shdr_info[cnt].shdr.sh_info].idx = 1; changes |= shdr_info[cnt].shdr.sh_info < cnt; } + } /* Mark the section as investigated. */ shdr_info[cnt].idx = 2; @@ -953,7 +978,7 @@ handle_elf (int fd, Elf *elf, const char error (EXIT_FAILURE, 0, gettext ("while generating output file: %s"), elf_errmsg (-1)); - assert (elf_ndxscn (shdr_info[cnt].newscn) == shdr_info[cnt].idx); + elf_assert (elf_ndxscn (shdr_info[cnt].newscn) == shdr_info[cnt].idx); /* Add this name to the section header string table. */ shdr_info[cnt].se = ebl_strtabadd (shst, shdr_info[cnt].name, 0); @@ -990,7 +1015,7 @@ handle_elf (int fd, Elf *elf, const char error (EXIT_FAILURE, 0, gettext ("while create section header section: %s"), elf_errmsg (-1)); - assert (elf_ndxscn (shdr_info[cnt].newscn) == shdr_info[cnt].idx); + elf_assert (elf_ndxscn (shdr_info[cnt].newscn) == shdr_info[cnt].idx); shdr_info[cnt].data = elf_newdata (shdr_info[cnt].newscn); if (shdr_info[cnt].data == NULL) @@ -1021,7 +1046,7 @@ handle_elf (int fd, Elf *elf, const char } /* Index of the section header table in the shdr_info array. */ - size_t shdridx = cnt; + shdridx = cnt; /* Add the section header string table section name. */ shdr_info[cnt].se = ebl_strtabadd (shst, ".shstrtab", 10); @@ -1046,7 +1071,7 @@ handle_elf (int fd, Elf *elf, const char error (EXIT_FAILURE, 0, gettext ("while create section header section: %s"), elf_errmsg (-1)); - assert (elf_ndxscn (shdr_info[cnt].newscn) == idx); + elf_assert (elf_ndxscn (shdr_info[cnt].newscn) == idx); /* Finalize the string table and fill in the correct indices in the section headers. */ @@ -1136,20 +1161,20 @@ handle_elf (int fd, Elf *elf, const char shndxdata = elf_getdata (shdr_info[shdr_info[cnt].symtab_idx].scn, NULL); - assert ((versiondata->d_size / sizeof (Elf32_Word)) + elf_assert ((versiondata->d_size / sizeof (Elf32_Word)) >= shdr_info[cnt].data->d_size / elsize); } if (shdr_info[cnt].version_idx != 0) { - assert (shdr_info[cnt].shdr.sh_type == SHT_DYNSYM); + elf_assert (shdr_info[cnt].shdr.sh_type == SHT_DYNSYM); /* This section has associated version information. We have to modify that information, too. */ versiondata = elf_getdata (shdr_info[shdr_info[cnt].version_idx].scn, NULL); - assert ((versiondata->d_size / sizeof (GElf_Versym)) + elf_assert ((versiondata->d_size / sizeof (GElf_Versym)) >= shdr_info[cnt].data->d_size / elsize); } @@ -1204,7 +1229,7 @@ handle_elf (int fd, Elf *elf, const char sec = shdr_info[sym->st_shndx].idx; else { - assert (shndxdata != NULL); + elf_assert (shndxdata != NULL); sec = shdr_info[xshndx].idx; } @@ -1225,7 +1250,7 @@ handle_elf (int fd, Elf *elf, const char nxshndx = sec; } - assert (sec < SHN_LORESERVE || shndxdata != NULL); + elf_assert (sec < SHN_LORESERVE || shndxdata != NULL); if ((inner != destidx || nshndx != sym->st_shndx || (shndxdata != NULL && nxshndx != xshndx)) @@ -1248,7 +1273,7 @@ handle_elf (int fd, Elf *elf, const char else /* This is a section symbol for a section which has been removed. */ - assert (GELF_ST_TYPE (sym->st_info) == STT_SECTION); + elf_assert (GELF_ST_TYPE (sym->st_info) == STT_SECTION); } if (destidx != inner) @@ -1441,11 +1466,11 @@ handle_elf (int fd, Elf *elf, const char { GElf_Sym sym_mem; GElf_Sym *sym = gelf_getsym (symd, inner, &sym_mem); - assert (sym != NULL); + elf_assert (sym != NULL); const char *name = elf_strptr (elf, strshndx, sym->st_name); - assert (name != NULL); + elf_assert (name != NULL); size_t hidx = elf_hash (name) % nbucket; if (bucket[hidx] == 0) @@ -1464,7 +1489,7 @@ handle_elf (int fd, Elf *elf, const char else { /* Alpha and S390 64-bit use 64-bit SHT_HASH entries. */ - assert (shdr_info[cnt].shdr.sh_entsize + elf_assert (shdr_info[cnt].shdr.sh_entsize == sizeof (Elf64_Xword)); Elf64_Xword *bucket = (Elf64_Xword *) hashd->d_buf; @@ -1495,11 +1520,11 @@ handle_elf (int fd, Elf *elf, const char { GElf_Sym sym_mem; GElf_Sym *sym = gelf_getsym (symd, inner, &sym_mem); - assert (sym != NULL); + elf_assert (sym != NULL); const char *name = elf_strptr (elf, strshndx, sym->st_name); - assert (name != NULL); + elf_assert (name != NULL); size_t hidx = elf_hash (name) % nbucket; if (bucket[hidx] == 0) --- elfutils-0.130/src/elflint.c.robustify +++ elfutils-0.130/src/elflint.c @@ -126,6 +126,9 @@ static uint32_t shstrndx; /* Array to count references in section groups. */ static int *scnref; +/* Number of sections. */ +static unsigned int shnum; + int main (int argc, char *argv[]) @@ -315,10 +318,19 @@ section_name (Ebl *ebl, int idx) { GElf_Shdr shdr_mem; GElf_Shdr *shdr; + const char *ret; + + if ((unsigned int) idx > shnum) + return "<invalid>"; shdr = gelf_getshdr (elf_getscn (ebl->elf, idx), &shdr_mem); + if (shdr == NULL) + return "<invalid>"; - return elf_strptr (ebl->elf, shstrndx, shdr->sh_name); + ret = elf_strptr (ebl->elf, shstrndx, shdr->sh_name); + if (ret == NULL) + return "<invalid>"; + return ret; } @@ -340,10 +352,6 @@ static const int valid_e_machine[] = (sizeof (valid_e_machine) / sizeof (valid_e_machine[0])) -/* Number of sections. */ -static unsigned int shnum; - - static void check_elf_header (Ebl *ebl, GElf_Ehdr *ehdr, size_t size) { @@ -606,7 +614,8 @@ section [%2d] '%s': symbol table cannot } } - if (shdr->sh_entsize != gelf_fsize (ebl->elf, ELF_T_SYM, 1, EV_CURRENT)) + size_t sh_entsize = gelf_fsize (ebl->elf, ELF_T_SYM, 1, EV_CURRENT); + if (shdr->sh_entsize != sh_entsize) ERROR (gettext ("\ section [%2zu] '%s': entry size is does not match ElfXX_Sym\n"), cnt, section_name (ebl, cnt)); @@ -644,7 +653,7 @@ section [%2d] '%s': XINDEX for zeroth en xndxscnidx, section_name (ebl, xndxscnidx)); } - for (cnt = 1; cnt < shdr->sh_size / shdr->sh_entsize; ++cnt) + for (cnt = 1; cnt < shdr->sh_size / sh_entsize; ++cnt) { sym = gelf_getsymshndx (data, xndxdata, cnt, &sym_mem, &xndx); if (sym == NULL) @@ -662,7 +671,8 @@ section [%2d] '%s': symbol %zu: invalid else { name = elf_strptr (ebl->elf, shdr->sh_link, sym->st_name); - assert (name != NULL); + assert (name != NULL + || strshdr->sh_type != SHT_STRTAB); } if (sym->st_shndx == SHN_XINDEX) @@ -992,9 +1002,11 @@ is_rel_dyn (Ebl *ebl, const GElf_Ehdr *e { GElf_Shdr rcshdr_mem; const GElf_Shdr *rcshdr = gelf_getshdr (scn, &rcshdr_mem); - assert (rcshdr != NULL); - if (rcshdr->sh_type == SHT_DYNAMIC) + if (rcshdr == NULL) + break; + + if (rcshdr->sh_type == SHT_DYNAMIC && rcshdr->sh_entsize) { /* Found the dynamic section. Look through it. */ Elf_Data *d = elf_getdata (scn, NULL); @@ -1004,7 +1016,9 @@ is_rel_dyn (Ebl *ebl, const GElf_Ehdr *e { GElf_Dyn dyn_mem; GElf_Dyn *dyn = gelf_getdyn (d, cnt, &dyn_mem); - assert (dyn != NULL); + + if (dyn == NULL) + break; if (dyn->d_tag == DT_RELCOUNT) { @@ -1018,7 +1032,9 @@ section [%2d] '%s': DT_RELCOUNT used for /* Does the number specified number of relative relocations exceed the total number of relocations? */ - if (dyn->d_un.d_val > shdr->sh_size / shdr->sh_entsize) + if (shdr->sh_entsize != 0 + && dyn->d_un.d_val > (shdr->sh_size + / shdr->sh_entsize)) ERROR (gettext ("\ section [%2d] '%s': DT_RELCOUNT value %d too high for this section\n"), idx, section_name (ebl, idx), @@ -1178,7 +1194,8 @@ section [%2d] '%s': no relocations for m } } - if (shdr->sh_entsize != gelf_fsize (ebl->elf, reltype, 1, EV_CURRENT)) + size_t sh_entsize = gelf_fsize (ebl->elf, reltype, 1, EV_CURRENT); + if (shdr->sh_entsize != sh_entsize) ERROR (gettext (reltype == ELF_T_RELA ? "\ section [%2d] '%s': section entry size does not match ElfXX_Rela\n" : "\ section [%2d] '%s': section entry size does not match ElfXX_Rel\n"), @@ -1401,7 +1418,8 @@ check_rela (Ebl *ebl, GElf_Ehdr *ehdr, G Elf_Data *symdata = elf_getdata (symscn, NULL); enum load_state state = state_undecided; - for (size_t cnt = 0; cnt < shdr->sh_size / shdr->sh_entsize; ++cnt) + size_t sh_entsize = gelf_fsize (ebl->elf, ELF_T_RELA, 1, EV_CURRENT); + for (size_t cnt = 0; cnt < shdr->sh_size / sh_entsize; ++cnt) { GElf_Rela rela_mem; GElf_Rela *rela = gelf_getrela (data, cnt, &rela_mem); @@ -1451,7 +1469,8 @@ check_rel (Ebl *ebl, GElf_Ehdr *ehdr, GE Elf_Data *symdata = elf_getdata (symscn, NULL); enum load_state state = state_undecided; - for (size_t cnt = 0; cnt < shdr->sh_size / shdr->sh_entsize; ++cnt) + size_t sh_entsize = gelf_fsize (ebl->elf, ELF_T_REL, 1, EV_CURRENT); + for (size_t cnt = 0; cnt < shdr->sh_size / sh_entsize; ++cnt) { GElf_Rel rel_mem; GElf_Rel *rel = gelf_getrel (data, cnt, &rel_mem); @@ -1555,7 +1574,8 @@ section [%2d] '%s': referenced as string shdr->sh_link, section_name (ebl, shdr->sh_link), idx, section_name (ebl, idx)); - if (shdr->sh_entsize != gelf_fsize (ebl->elf, ELF_T_DYN, 1, EV_CURRENT)) + size_t sh_entsize = gelf_fsize (ebl->elf, ELF_T_DYN, 1, EV_CURRENT); + if (shdr->sh_entsize != sh_entsize) ERROR (gettext ("\ section [%2d] '%s': section entry size does not match ElfXX_Dyn\n"), idx, section_name (ebl, idx)); @@ -1565,7 +1585,7 @@ section [%2d] '%s': section entry size d idx, section_name (ebl, idx)); bool non_null_warned = false; - for (cnt = 0; cnt < shdr->sh_size / shdr->sh_entsize; ++cnt) + for (cnt = 0; cnt < shdr->sh_size / sh_entsize; ++cnt) { GElf_Dyn dyn_mem; GElf_Dyn *dyn = gelf_getdyn (data, cnt, &dyn_mem); @@ -1846,6 +1866,8 @@ section [%2d] '%s': entry size does not idx, section_name (ebl, idx)); if (symshdr != NULL + && shdr->sh_entsize + && symshdr->sh_entsize && (shdr->sh_size / shdr->sh_entsize < symshdr->sh_size / symshdr->sh_entsize)) ERROR (gettext ("\ @@ -1872,6 +1894,12 @@ section [%2d] '%s': extended section ind } Elf_Data *data = elf_getdata (elf_getscn (ebl->elf, idx), NULL); + if (data == NULL) + { + ERROR (gettext ("section [%2d] '%s': cannot get section data\n"), + idx, section_name (ebl, idx)); + return; + } if (*((Elf32_Word *) data->d_buf) != 0) ERROR (gettext ("symbol 0 should have zero extended section index\n")); @@ -1914,7 +1942,7 @@ section [%2d] '%s': hash table section i size_t maxidx = nchain; - if (symshdr != NULL) + if (symshdr != NULL && symshdr->sh_entsize != 0) { size_t symsize = symshdr->sh_size / symshdr->sh_entsize; @@ -1925,18 +1953,28 @@ section [%2d] '%s': hash table section i maxidx = symsize; } + Elf32_Word *buf = (Elf32_Word *) data->d_buf; + Elf32_Word *end = (Elf32_Word *) ((char *) data->d_buf + shdr->sh_size); size_t cnt; for (cnt = 2; cnt < 2 + nbucket; ++cnt) - if (((Elf32_Word *) data->d_buf)[cnt] >= maxidx) + { + if (buf + cnt >= end) + break; + else if (buf[cnt] >= maxidx) ERROR (gettext ("\ section [%2d] '%s': hash bucket reference %zu out of bounds\n"), idx, section_name (ebl, idx), cnt - 2); + } for (; cnt < 2 + nbucket + nchain; ++cnt) - if (((Elf32_Word *) data->d_buf)[cnt] >= maxidx) + { + if (buf + cnt >= end) + break; + else if (buf[cnt] >= maxidx) ERROR (gettext ("\ section [%2d] '%s': hash chain reference %zu out of bounds\n"), idx, section_name (ebl, idx), cnt - 2 - nbucket); + } } @@ -1966,18 +2004,28 @@ section [%2d] '%s': hash table section i maxidx = symsize; } + Elf64_Xword *buf = (Elf64_Xword *) data->d_buf; + Elf64_Xword *end = (Elf64_Xword *) ((char *) data->d_buf + shdr->sh_size); size_t cnt; for (cnt = 2; cnt < 2 + nbucket; ++cnt) - if (((Elf64_Xword *) data->d_buf)[cnt] >= maxidx) + { + if (buf + cnt >= end) + break; + else if (buf[cnt] >= maxidx) ERROR (gettext ("\ section [%2d] '%s': hash bucket reference %zu out of bounds\n"), idx, section_name (ebl, idx), cnt - 2); + } for (; cnt < 2 + nbucket + nchain; ++cnt) - if (((Elf64_Xword *) data->d_buf)[cnt] >= maxidx) + { + if (buf + cnt >= end) + break; + else if (buf[cnt] >= maxidx) ERROR (gettext ("\ section [%2d] '%s': hash chain reference %" PRIu64 " out of bounds\n"), - idx, section_name (ebl, idx), (uint64_t) (cnt - 2 - nbucket)); + idx, section_name (ebl, idx), (uint64_t) cnt - 2 - nbucket); + } } @@ -2002,7 +2050,7 @@ section [%2d] '%s': bitmask size not pow if (shdr->sh_size < (4 + bitmask_words + nbuckets) * sizeof (Elf32_Word)) { ERROR (gettext ("\ -section [%2d] '%s': hash table section is too small (is %ld, expected at least%ld)\n"), +section [%2d] '%s': hash table section is too small (is %ld, expected at least %ld)\n"), idx, section_name (ebl, idx), (long int) shdr->sh_size, (long int) ((4 + bitmask_words + nbuckets) * sizeof (Elf32_Word))); return; @@ -2659,8 +2707,9 @@ section [%2d] '%s' refers in sh_link to /* The number of elements in the version symbol table must be the same as the number of symbols. */ - if (shdr->sh_size / shdr->sh_entsize - != symshdr->sh_size / symshdr->sh_entsize) + if (shdr->sh_entsize && symshdr->sh_entsize + && (shdr->sh_size / shdr->sh_entsize + != symshdr->sh_size / symshdr->sh_entsize)) ERROR (gettext ("\ section [%2d] '%s' has different number of entries than symbol table [%2d] '%s'\n"), idx, section_name (ebl, idx), --- elfutils-0.127/libelf/elf_begin.c.robustify +++ elfutils-0.127/libelf/elf_begin.c @@ -155,7 +155,8 @@ get_shnum (void *map_address, unsigned c if (unlikely (result == 0) && ehdr.e32->e_shoff != 0) { - if (ehdr.e32->e_shoff + sizeof (Elf32_Shdr) > maxsize) + if (unlikely (ehdr.e32->e_shoff >= maxsize) + || unlikely (ehdr.e32->e_shoff + sizeof (Elf32_Shdr) > maxsize)) /* Cannot read the first section header. */ return 0; @@ -203,7 +204,8 @@ get_shnum (void *map_address, unsigned c if (unlikely (result == 0) && ehdr.e64->e_shoff != 0) { - if (ehdr.e64->e_shoff + sizeof (Elf64_Shdr) > maxsize) + if (unlikely (ehdr.e64->e_shoff >= maxsize) + || unlikely (ehdr.e64->e_shoff + sizeof (Elf64_Shdr) > maxsize)) /* Cannot read the first section header. */ return 0; @@ -275,6 +277,15 @@ file_read_elf (int fildes, void *map_add /* Could not determine the number of sections. */ return NULL; + /* Check for too many sections. */ + if (e_ident[EI_CLASS] == ELFCLASS32) + { + if (scncnt > SIZE_MAX / (sizeof (Elf_Scn) + sizeof (Elf32_Shdr))) + return NULL; + } + else if (scncnt > SIZE_MAX / (sizeof (Elf_Scn) + sizeof (Elf64_Shdr))) + return NULL; + /* We can now allocate the memory. */ Elf *elf = allocate_elf (fildes, map_address, offset, maxsize, cmd, parent, ELF_K_ELF, scncnt * sizeof (Elf_Scn)); @@ -308,13 +319,31 @@ file_read_elf (int fildes, void *map_add { /* We can use the mmapped memory. */ elf->state.elf32.ehdr = ehdr; + + if (unlikely (ehdr->e_shoff >= maxsize) + || unlikely (ehdr->e_shoff + + scncnt * sizeof (Elf32_Shdr) > maxsize)) + { + free_and_out: + free (elf); + __libelf_seterrno (ELF_E_INVALID_FILE); + return NULL; + } elf->state.elf32.shdr = (Elf32_Shdr *) ((char *) ehdr + ehdr->e_shoff); + if (ehdr->e_phnum > 0) + { /* Assign a value only if there really is a program header. Otherwise the value remains NULL. */ + if (unlikely (ehdr->e_phoff >= maxsize) + || unlikely (ehdr->e_phoff + + ehdr->e_phnum + * sizeof (Elf32_Phdr) > maxsize)) + goto free_and_out; elf->state.elf32.phdr = (Elf32_Phdr *) ((char *) ehdr + ehdr->e_phoff); + } for (size_t cnt = 0; cnt < scncnt; ++cnt) { @@ -383,13 +412,26 @@ file_read_elf (int fildes, void *map_add { /* We can use the mmapped memory. */ elf->state.elf64.ehdr = ehdr; + + if (unlikely (ehdr->e_shoff >= maxsize) + || unlikely (ehdr->e_shoff + + scncnt * sizeof (Elf32_Shdr) > maxsize)) + goto free_and_out; elf->state.elf64.shdr = (Elf64_Shdr *) ((char *) ehdr + ehdr->e_shoff); + if (ehdr->e_phnum > 0) + { /* Assign a value only if there really is a program header. Otherwise the value remains NULL. */ + if (unlikely (ehdr->e_phoff >= maxsize) + || unlikely (ehdr->e_phoff + + ehdr->e_phnum + * sizeof (Elf32_Phdr) > maxsize)) + goto free_and_out; elf->state.elf64.phdr = (Elf64_Phdr *) ((char *) ehdr + ehdr->e_phoff); + } for (size_t cnt = 0; cnt < scncnt; ++cnt) { --- elfutils-0.127/libelf/libelfP.h.robustify +++ elfutils-0.127/libelf/libelfP.h @@ -574,4 +574,13 @@ extern uint32_t __libelf_crc32 (uint32_t } \ } while (0) +/* Convenience macro. Assumes int NDX and TYPE with size at least + 2 bytes. */ +#if SIZE_MAX > 4294967295U +# define INVALID_NDX(ndx, type) unlikely (ndx < 0) +#else +# define INVALID_NDX(ndx, type) \ + unlikely ((unsigned int) (ndx) >= SIZE_MAX / sizeof (type)) +#endif + #endif /* libelfP.h */ --- elfutils-0.127/libelf/gelf_update_move.c.robustify +++ elfutils-0.127/libelf/gelf_update_move.c @@ -75,7 +75,7 @@ gelf_update_move (data, ndx, src) assert (sizeof (GElf_Move) == sizeof (Elf64_Move)); /* Check whether we have to resize the data buffer. */ - if (unlikely (ndx < 0) + if (INVALID_NDX (ndx, GElf_Move) || unlikely ((ndx + 1) * sizeof (GElf_Move) > data_scn->d.d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); --- elfutils-0.127/libelf/gelf_getsym.c.robustify +++ elfutils-0.127/libelf/gelf_getsym.c @@ -90,7 +90,8 @@ gelf_getsym (data, ndx, dst) table entries has to be adopted. The user better has provided a buffer where we can store the information. While copying the data we are converting the format. */ - if (unlikely ((ndx + 1) * sizeof (Elf32_Sym) > data->d_size)) + if (INVALID_NDX (ndx, Elf32_Sym) + || unlikely ((ndx + 1) * sizeof (Elf32_Sym) > data->d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); goto out; @@ -119,7 +120,8 @@ gelf_getsym (data, ndx, dst) /* The data is already in the correct form. Just make sure the index is OK. */ - if (unlikely ((ndx + 1) * sizeof (GElf_Sym) > data->d_size)) + if (INVALID_NDX (ndx, GElf_Sym) + || unlikely ((ndx + 1) * sizeof (GElf_Sym) > data->d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); goto out; --- elfutils-0.127/libelf/gelf_getrela.c.robustify +++ elfutils-0.127/libelf/gelf_getrela.c @@ -71,12 +71,6 @@ gelf_getrela (data, ndx, dst) if (data_scn == NULL) return NULL; - if (unlikely (ndx < 0)) - { - __libelf_seterrno (ELF_E_INVALID_INDEX); - return NULL; - } - if (unlikely (data_scn->d.d_type != ELF_T_RELA)) { __libelf_seterrno (ELF_E_INVALID_HANDLE); @@ -93,7 +87,8 @@ gelf_getrela (data, ndx, dst) if (scn->elf->class == ELFCLASS32) { /* We have to convert the data. */ - if (unlikely ((ndx + 1) * sizeof (Elf32_Rela) > data_scn->d.d_size)) + if (INVALID_NDX (ndx, Elf32_Rela) + || unlikely ((ndx + 1) * sizeof (Elf32_Rela) > data_scn->d.d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); result = NULL; @@ -114,7 +109,8 @@ gelf_getrela (data, ndx, dst) { /* Simply copy the data after we made sure we are actually getting correct data. */ - if (unlikely ((ndx + 1) * sizeof (Elf64_Rela) > data_scn->d.d_size)) + if (INVALID_NDX (ndx, Elf64_Rela) + || unlikely ((ndx + 1) * sizeof (Elf64_Rela) > data_scn->d.d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); result = NULL; --- elfutils-0.127/libelf/gelf_getmove.c.robustify +++ elfutils-0.127/libelf/gelf_getmove.c @@ -83,7 +83,8 @@ gelf_getmove (data, ndx, dst) /* The data is already in the correct form. Just make sure the index is OK. */ - if (unlikely ((ndx + 1) * sizeof (GElf_Move) > data->d_size)) + if (INVALID_NDX (ndx, GElf_Move) + || unlikely ((ndx + 1) * sizeof (GElf_Move) > data->d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); goto out; --- elfutils-0.127/libelf/gelf_update_symshndx.c.robustify +++ elfutils-0.127/libelf/gelf_update_symshndx.c @@ -77,12 +77,6 @@ gelf_update_symshndx (symdata, shndxdata if (symdata == NULL) return 0; - if (unlikely (ndx < 0)) - { - __libelf_seterrno (ELF_E_INVALID_INDEX); - return 0; - } - if (unlikely (symdata_scn->d.d_type != ELF_T_SYM)) { /* The type of the data better should match. */ @@ -128,7 +122,8 @@ gelf_update_symshndx (symdata, shndxdata } /* Check whether we have to resize the data buffer. */ - if (unlikely ((ndx + 1) * sizeof (Elf32_Sym) > symdata_scn->d.d_size)) + if (INVALID_NDX (ndx, Elf32_Sym) + || unlikely ((ndx + 1) * sizeof (Elf32_Sym) > symdata_scn->d.d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); goto out; @@ -151,7 +146,8 @@ gelf_update_symshndx (symdata, shndxdata else { /* Check whether we have to resize the data buffer. */ - if (unlikely ((ndx + 1) * sizeof (Elf64_Sym) > symdata_scn->d.d_size)) + if (INVALID_NDX (ndx, Elf64_Sym) + || unlikely ((ndx + 1) * sizeof (Elf64_Sym) > symdata_scn->d.d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); goto out; --- elfutils-0.127/libelf/gelf_update_dyn.c.robustify +++ elfutils-0.127/libelf/gelf_update_dyn.c @@ -71,12 +71,6 @@ gelf_update_dyn (data, ndx, src) if (data == NULL) return 0; - if (unlikely (ndx < 0)) - { - __libelf_seterrno (ELF_E_INVALID_INDEX); - return 0; - } - if (unlikely (data_scn->d.d_type != ELF_T_DYN)) { /* The type of the data better should match. */ @@ -102,7 +96,8 @@ gelf_update_dyn (data, ndx, src) } /* Check whether we have to resize the data buffer. */ - if (unlikely ((ndx + 1) * sizeof (Elf32_Dyn) > data_scn->d.d_size)) + if (INVALID_NDX (ndx, Elf32_Dyn) + || unlikely ((ndx + 1) * sizeof (Elf32_Dyn) > data_scn->d.d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); goto out; @@ -116,7 +111,8 @@ gelf_update_dyn (data, ndx, src) else { /* Check whether we have to resize the data buffer. */ - if (unlikely ((ndx + 1) * sizeof (Elf64_Dyn) > data_scn->d.d_size)) + if (INVALID_NDX (ndx, Elf64_Dyn) + || unlikely ((ndx + 1) * sizeof (Elf64_Dyn) > data_scn->d.d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); goto out; --- elfutils-0.127/libelf/gelf_update_rela.c.robustify +++ elfutils-0.127/libelf/gelf_update_rela.c @@ -68,12 +68,6 @@ gelf_update_rela (Elf_Data *dst, int ndx if (dst == NULL) return 0; - if (unlikely (ndx < 0)) - { - __libelf_seterrno (ELF_E_INVALID_INDEX); - return 0; - } - if (unlikely (data_scn->d.d_type != ELF_T_RELA)) { /* The type of the data better should match. */ @@ -101,7 +95,8 @@ gelf_update_rela (Elf_Data *dst, int ndx } /* Check whether we have to resize the data buffer. */ - if (unlikely ((ndx + 1) * sizeof (Elf32_Rela) > data_scn->d.d_size)) + if (INVALID_NDX (ndx, Elf32_Rela) + || unlikely ((ndx + 1) * sizeof (Elf32_Rela) > data_scn->d.d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); goto out; @@ -117,7 +112,8 @@ gelf_update_rela (Elf_Data *dst, int ndx else { /* Check whether we have to resize the data buffer. */ - if (unlikely ((ndx + 1) * sizeof (Elf64_Rela) > data_scn->d.d_size)) + if (INVALID_NDX (ndx, Elf64_Rela) + || unlikely ((ndx + 1) * sizeof (Elf64_Rela) > data_scn->d.d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); goto out; --- elfutils-0.127/libelf/gelf_getsymshndx.c.robustify +++ elfutils-0.127/libelf/gelf_getsymshndx.c @@ -90,7 +90,9 @@ gelf_getsymshndx (symdata, shndxdata, nd section index table. */ if (likely (shndxdata_scn != NULL)) { - if (unlikely ((ndx + 1) * sizeof (Elf32_Word) > shndxdata_scn->d.d_size)) + if (INVALID_NDX (ndx, Elf32_Word) + || unlikely ((ndx + 1) * sizeof (Elf32_Word) + > shndxdata_scn->d.d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); goto out; @@ -110,7 +112,8 @@ gelf_getsymshndx (symdata, shndxdata, nd table entries has to be adopted. The user better has provided a buffer where we can store the information. While copying the data we are converting the format. */ - if (unlikely ((ndx + 1) * sizeof (Elf32_Sym) > symdata->d_size)) + if (INVALID_NDX (ndx, Elf32_Sym) + || unlikely ((ndx + 1) * sizeof (Elf32_Sym) > symdata->d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); goto out; @@ -139,7 +142,8 @@ gelf_getsymshndx (symdata, shndxdata, nd /* The data is already in the correct form. Just make sure the index is OK. */ - if (unlikely ((ndx + 1) * sizeof (GElf_Sym) > symdata->d_size)) + if (INVALID_NDX (ndx, GElf_Sym) + || unlikely ((ndx + 1) * sizeof (GElf_Sym) > symdata->d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); goto out; --- elfutils-0.127/libelf/elf32_newphdr.c.robustify +++ elfutils-0.127/libelf/elf32_newphdr.c @@ -124,6 +124,12 @@ elfw2(LIBELFBITS,newphdr) (elf, count) else if (elf->state.ELFW(elf,LIBELFBITS).ehdr->e_phnum != count || elf->state.ELFW(elf,LIBELFBITS).phdr == NULL) { + if (unlikely (count > SIZE_MAX / sizeof (ElfW2(LIBELFBITS,Phdr)))) + { + result = NULL; + goto out; + } + /* Allocate a new program header with the appropriate number of elements. */ result = (ElfW2(LIBELFBITS,Phdr) *) --- elfutils-0.127/libelf/gelf_update_sym.c.robustify +++ elfutils-0.127/libelf/gelf_update_sym.c @@ -72,12 +72,6 @@ gelf_update_sym (data, ndx, src) if (data == NULL) return 0; - if (unlikely (ndx < 0)) - { - __libelf_seterrno (ELF_E_INVALID_INDEX); - return 0; - } - if (unlikely (data_scn->d.d_type != ELF_T_SYM)) { /* The type of the data better should match. */ @@ -102,7 +96,8 @@ gelf_update_sym (data, ndx, src) } /* Check whether we have to resize the data buffer. */ - if (unlikely ((ndx + 1) * sizeof (Elf32_Sym) > data_scn->d.d_size)) + if (INVALID_NDX (ndx, Elf32_Sym) + || unlikely ((ndx + 1) * sizeof (Elf32_Sym) > data_scn->d.d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); goto out; @@ -125,7 +120,8 @@ gelf_update_sym (data, ndx, src) else { /* Check whether we have to resize the data buffer. */ - if (unlikely ((ndx + 1) * sizeof (Elf64_Sym) > data_scn->d.d_size)) + if (INVALID_NDX (ndx, Elf64_Sym) + || unlikely ((ndx + 1) * sizeof (Elf64_Sym) > data_scn->d.d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); goto out; --- elfutils-0.127/libelf/gelf_getsyminfo.c.robustify +++ elfutils-0.127/libelf/gelf_getsyminfo.c @@ -84,7 +84,8 @@ gelf_getsyminfo (data, ndx, dst) /* The data is already in the correct form. Just make sure the index is OK. */ - if (unlikely ((ndx + 1) * sizeof (GElf_Syminfo) > data->d_size)) + if (INVALID_NDX (ndx, GElf_Syminfo) + || unlikely ((ndx + 1) * sizeof (GElf_Syminfo) > data->d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); goto out; --- elfutils-0.127/libelf/gelf_getlib.c.robustify +++ elfutils-0.127/libelf/gelf_getlib.c @@ -86,7 +86,8 @@ gelf_getlib (data, ndx, dst) /* The data is already in the correct form. Just make sure the index is OK. */ GElf_Lib *result = NULL; - if (unlikely ((ndx + 1) * sizeof (GElf_Lib) > data->d_size)) + if (INVALID_NDX (ndx, GElf_Lib) + || unlikely ((ndx + 1) * sizeof (GElf_Lib) > data->d_size)) __libelf_seterrno (ELF_E_INVALID_INDEX); else { --- elfutils-0.127/libelf/elf32_updatefile.c.robustify +++ elfutils-0.127/libelf/elf32_updatefile.c @@ -201,6 +201,9 @@ __elfw2(LIBELFBITS,updatemmap) (Elf *elf /* Write all the sections. Well, only those which are modified. */ if (shnum > 0) { + if (unlikely (shnum > SIZE_MAX / sizeof (Elf_Scn *))) + return 1; + Elf_ScnList *list = &elf->state.ELFW(elf,LIBELFBITS).scns; Elf_Scn **scns = (Elf_Scn **) alloca (shnum * sizeof (Elf_Scn *)); char *const shdr_start = ((char *) elf->map_address + elf->start_offset @@ -571,6 +574,10 @@ __elfw2(LIBELFBITS,updatefile) (Elf *elf /* Write all the sections. Well, only those which are modified. */ if (shnum > 0) { + if (unlikely (shnum > SIZE_MAX / (sizeof (Elf_Scn *) + + sizeof (ElfW2(LIBELFBITS,Shdr))))) + return 1; + off_t shdr_offset = elf->start_offset + ehdr->e_shoff; #if EV_NUM != 2 xfct_t shdr_fctp = __elf_xfctstom[__libelf_version - 1][EV_CURRENT - 1][ELFW(ELFCLASS, LIBELFBITS) - 1][ELF_T_SHDR]; --- elfutils-0.127/libelf/gelf_getversym.c.robustify +++ elfutils-0.127/libelf/gelf_getversym.c @@ -92,7 +92,8 @@ gelf_getversym (data, ndx, dst) /* The data is already in the correct form. Just make sure the index is OK. */ - if (unlikely ((ndx + 1) * sizeof (GElf_Versym) > data->d_size)) + if (INVALID_NDX (ndx, GElf_Versym) + || unlikely ((ndx + 1) * sizeof (GElf_Versym) > data->d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); result = NULL; --- elfutils-0.127/libelf/elf_getarsym.c.robustify +++ elfutils-0.127/libelf/elf_getarsym.c @@ -179,6 +179,9 @@ elf_getarsym (elf, ptr) size_t index_size = atol (tmpbuf); if (SARMAG + sizeof (struct ar_hdr) + index_size > elf->maximum_size +#if SIZE_MAX <= 4294967295U + || n >= SIZE_MAX / sizeof (Elf_Arsym) +#endif || n * sizeof (uint32_t) > index_size) { /* This index table cannot be right since it does not fit into --- elfutils-0.127/libelf/gelf_getrel.c.robustify +++ elfutils-0.127/libelf/gelf_getrel.c @@ -71,12 +71,6 @@ gelf_getrel (data, ndx, dst) if (data_scn == NULL) return NULL; - if (unlikely (ndx < 0)) - { - __libelf_seterrno (ELF_E_INVALID_INDEX); - return NULL; - } - if (unlikely (data_scn->d.d_type != ELF_T_REL)) { __libelf_seterrno (ELF_E_INVALID_HANDLE); @@ -93,7 +87,8 @@ gelf_getrel (data, ndx, dst) if (scn->elf->class == ELFCLASS32) { /* We have to convert the data. */ - if (unlikely ((ndx + 1) * sizeof (Elf32_Rel) > data_scn->d.d_size)) + if (INVALID_NDX (ndx, Elf32_Rel) + || unlikely ((ndx + 1) * sizeof (Elf32_Rel) > data_scn->d.d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); result = NULL; @@ -113,7 +108,8 @@ gelf_getrel (data, ndx, dst) { /* Simply copy the data after we made sure we are actually getting correct data. */ - if (unlikely ((ndx + 1) * sizeof (Elf64_Rel) > data_scn->d.d_size)) + if (INVALID_NDX (ndx, Elf64_Rel) + || unlikely ((ndx + 1) * sizeof (Elf64_Rel) > data_scn->d.d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); result = NULL; --- elfutils-0.127/libelf/gelf_update_versym.c.robustify +++ elfutils-0.127/libelf/gelf_update_versym.c @@ -75,7 +75,7 @@ gelf_update_versym (data, ndx, src) assert (sizeof (GElf_Versym) == sizeof (Elf64_Versym)); /* Check whether we have to resize the data buffer. */ - if (unlikely (ndx < 0) + if (INVALID_NDX (ndx, GElf_Versym) || unlikely ((ndx + 1) * sizeof (GElf_Versym) > data_scn->d.d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); --- elfutils-0.127/libelf/gelf_getdyn.c.robustify +++ elfutils-0.127/libelf/gelf_getdyn.c @@ -93,7 +93,8 @@ gelf_getdyn (data, ndx, dst) table entries has to be adopted. The user better has provided a buffer where we can store the information. While copying the data we are converting the format. */ - if (unlikely ((ndx + 1) * sizeof (Elf32_Dyn) > data_scn->d.d_size)) + if (INVALID_NDX (ndx, Elf32_Dyn) + || unlikely ((ndx + 1) * sizeof (Elf32_Dyn) > data_scn->d.d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); goto out; @@ -114,7 +115,8 @@ gelf_getdyn (data, ndx, dst) /* The data is already in the correct form. Just make sure the index is OK. */ - if (unlikely ((ndx + 1) * sizeof (GElf_Dyn) > data_scn->d.d_size)) + if (INVALID_NDX (ndx, GElf_Dyn) + || unlikely ((ndx + 1) * sizeof (GElf_Dyn) > data_scn->d.d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); goto out; --- elfutils-0.127/libelf/gelf_update_syminfo.c.robustify +++ elfutils-0.127/libelf/gelf_update_syminfo.c @@ -72,12 +72,6 @@ gelf_update_syminfo (data, ndx, src) if (data == NULL) return 0; - if (unlikely (ndx < 0)) - { - __libelf_seterrno (ELF_E_INVALID_INDEX); - return 0; - } - if (unlikely (data_scn->d.d_type != ELF_T_SYMINFO)) { /* The type of the data better should match. */ @@ -93,7 +87,8 @@ gelf_update_syminfo (data, ndx, src) rwlock_wrlock (scn->elf->lock); /* Check whether we have to resize the data buffer. */ - if (unlikely ((ndx + 1) * sizeof (GElf_Syminfo) > data_scn->d.d_size)) + if (INVALID_NDX (ndx, GElf_Syminfo) + || unlikely ((ndx + 1) * sizeof (GElf_Syminfo) > data_scn->d.d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); goto out; --- elfutils-0.127/libelf/gelf_update_rel.c.robustify +++ elfutils-0.127/libelf/gelf_update_rel.c @@ -68,12 +68,6 @@ gelf_update_rel (Elf_Data *dst, int ndx, if (dst == NULL) return 0; - if (unlikely (ndx < 0)) - { - __libelf_seterrno (ELF_E_INVALID_INDEX); - return 0; - } - if (unlikely (data_scn->d.d_type != ELF_T_REL)) { /* The type of the data better should match. */ @@ -99,7 +93,8 @@ gelf_update_rel (Elf_Data *dst, int ndx, } /* Check whether we have to resize the data buffer. */ - if (unlikely ((ndx + 1) * sizeof (Elf32_Rel) > data_scn->d.d_size)) + if (INVALID_NDX (ndx, Elf32_Rel) + || unlikely ((ndx + 1) * sizeof (Elf32_Rel) > data_scn->d.d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); goto out; @@ -114,7 +109,8 @@ gelf_update_rel (Elf_Data *dst, int ndx, else { /* Check whether we have to resize the data buffer. */ - if (unlikely ((ndx + 1) * sizeof (Elf64_Rel) > data_scn->d.d_size)) + if (INVALID_NDX (ndx, Elf64_Rel) + || unlikely ((ndx + 1) * sizeof (Elf64_Rel) > data_scn->d.d_size)) { __libelf_seterrno (ELF_E_INVALID_INDEX); goto out; --- elfutils-0.127/libelf/elf_newscn.c.robustify +++ elfutils-0.127/libelf/elf_newscn.c @@ -104,10 +104,18 @@ elf_newscn (elf) else { /* We must allocate a new element. */ - Elf_ScnList *newp; + Elf_ScnList *newp = NULL; assert (elf->state.elf.scnincr > 0); + if ( +#if SIZE_MAX <= 4294967295U + likely (elf->state.elf.scnincr + < SIZE_MAX / 2 / sizeof (Elf_Scn) - sizeof (Elf_ScnList)) +#else + 1 +#endif + ) newp = (Elf_ScnList *) calloc (sizeof (Elf_ScnList) + ((elf->state.elf.scnincr *= 2) * sizeof (Elf_Scn)), 1); --- elfutils-0.127/libelf/gelf_update_lib.c.robustify +++ elfutils-0.127/libelf/gelf_update_lib.c @@ -68,12 +68,6 @@ gelf_update_lib (data, ndx, src) if (data == NULL) return 0; - if (unlikely (ndx < 0)) - { - __libelf_seterrno (ELF_E_INVALID_INDEX); - return 0; - } - Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data; if (unlikely (data_scn->d.d_type != ELF_T_LIB)) { @@ -87,7 +81,8 @@ gelf_update_lib (data, ndx, src) /* Check whether we have to resize the data buffer. */ int result = 0; - if (unlikely ((ndx + 1) * sizeof (Elf64_Lib) > data_scn->d.d_size)) + if (INVALID_NDX (ndx, Elf64_Lib) + || unlikely ((ndx + 1) * sizeof (Elf64_Lib) > data_scn->d.d_size)) __libelf_seterrno (ELF_E_INVALID_INDEX); else { --- elfutils-0.127/libelf/elf_getshstrndx.c.robustify +++ elfutils-0.127/libelf/elf_getshstrndx.c @@ -125,10 +125,25 @@ elf_getshstrndx (elf, dst) if (elf->map_address != NULL && elf->state.elf32.ehdr->e_ident[EI_DATA] == MY_ELFDATA && (ALLOW_UNALIGNED - || (((size_t) ((char *) elf->map_address + offset)) + || (((size_t) ((char *) elf->map_address + + elf->start_offset + offset)) & (__alignof__ (Elf32_Shdr) - 1)) == 0)) + { + /* First see whether the information in the ELF header is + valid and it does not ask for too much. */ + if (unlikely (offset + sizeof (Elf32_Shdr) + > elf->maximum_size)) + { + /* Something is wrong. */ + __libelf_seterrno (ELF_E_INVALID_SECTION_HEADER); + result = -1; + goto out; + } + /* We can directly access the memory. */ - num = ((Elf32_Shdr *) (elf->map_address + offset))->sh_link; + num = ((Elf32_Shdr *) (elf->map_address + elf->start_offset + + offset))->sh_link; + } else { /* We avoid reading in all the section headers. Just read @@ -163,10 +178,25 @@ elf_getshstrndx (elf, dst) if (elf->map_address != NULL && elf->state.elf64.ehdr->e_ident[EI_DATA] == MY_ELFDATA && (ALLOW_UNALIGNED - || (((size_t) ((char *) elf->map_address + offset)) + || (((size_t) ((char *) elf->map_address + + elf->start_offset + offset)) & (__alignof__ (Elf64_Shdr) - 1)) == 0)) + { + /* First see whether the information in the ELF header is + valid and it does not ask for too much. */ + if (unlikely (offset + sizeof (Elf64_Shdr) + > elf->maximum_size)) + { + /* Something is wrong. */ + __libelf_seterrno (ELF_E_INVALID_SECTION_HEADER); + result = -1; + goto out; + } + /* We can directly access the memory. */ - num = ((Elf64_Shdr *) (elf->map_address + offset))->sh_link; + num = ((Elf64_Shdr *) (elf->map_address + + elf->start_offset + offset))->sh_link; + } else { /* We avoid reading in all the section headers. Just read --- elfutils-0.127/libelf/elf32_getshdr.c.robustify +++ elfutils-0.127/libelf/elf32_getshdr.c @@ -101,7 +101,8 @@ elfw2(LIBELFBITS,getshdr) (scn) goto out; size_t shnum; - if (INTUSE (elf_getshnum) (elf, &shnum) != 0) + if (INTUSE (elf_getshnum) (elf, &shnum) != 0 + || shnum > SIZE_MAX / sizeof (ElfW2(LIBELFBITS,Shdr))) goto out; size_t size = shnum * sizeof (ElfW2(LIBELFBITS,Shdr)); @@ -118,6 +119,16 @@ elfw2(LIBELFBITS,getshdr) (scn) if (elf->map_address != NULL) { + /* First see whether the information in the ELF header is + valid and it does not ask for too much. */ + if (unlikely (ehdr->e_shoff >= elf->maximum_size) + || unlikely (ehdr->e_shoff + size > elf->maximum_size)) + { + /* Something is wrong. */ + __libelf_seterrno (ELF_E_INVALID_SECTION_HEADER); + goto free_and_out; + } + ElfW2(LIBELFBITS,Shdr) *notcvt; /* All the data is already mapped. If we could use it --- elfutils-0.127/libelf/elf32_getphdr.c.robustify +++ elfutils-0.127/libelf/elf32_getphdr.c @@ -116,6 +116,16 @@ elfw2(LIBELFBITS,getphdr) (elf) if (elf->map_address != NULL) { + /* First see whether the information in the ELF header is + valid and it does not ask for too much. */ + if (unlikely (ehdr->e_phoff >= elf->maximum_size) + || unlikely (ehdr->e_phoff + size > elf->maximum_size)) + { + /* Something is wrong. */ + __libelf_seterrno (ELF_E_INVALID_PHDR); + goto out; + } + /* All the data is already mapped. Use it. */ void *file_phdr = ((char *) elf->map_address + elf->start_offset + ehdr->e_phoff);
Locations
Projects
Search
Status Monitor
Help
OpenBuildService.org
Documentation
API Documentation
Code of Conduct
Contact
Support
@OBShq
Terms
openSUSE Build Service is sponsored by
The Open Build Service is an
openSUSE project
.
Sign Up
Log In
Places
Places
All Projects
Status Monitor
