diff options
Diffstat (limited to 'src/readelf.c')
-rw-r--r-- | src/readelf.c | 181 |
1 files changed, 133 insertions, 48 deletions
diff --git a/src/readelf.c b/src/readelf.c index 1c790650..ca9772e4 100644 --- a/src/readelf.c +++ b/src/readelf.c @@ -211,9 +211,11 @@ static void print_shdr (Ebl *ebl, GElf_Ehdr *ehdr); static void print_phdr (Ebl *ebl, GElf_Ehdr *ehdr); static void print_scngrp (Ebl *ebl); static void print_dynamic (Ebl *ebl, GElf_Ehdr *ehdr); -static void print_relocs (Ebl *ebl); -static void handle_relocs_rel (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr); -static void handle_relocs_rela (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr); +static void print_relocs (Ebl *ebl, GElf_Ehdr *ehdr); +static void handle_relocs_rel (Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn, + GElf_Shdr *shdr); +static void handle_relocs_rela (Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn, + GElf_Shdr *shdr); static void print_symtab (Ebl *ebl, int type); static void handle_symtab (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr); static void print_verinfo (Ebl *ebl); @@ -606,7 +608,7 @@ process_elf_file (Dwfl_Module *dwflmod, int fd) } /* Determine the number of sections. */ - if (unlikely (elf_getshnum (ebl->elf, &shnum) < 0)) + if (unlikely (elf_getshdrnum (ebl->elf, &shnum) < 0)) error (EXIT_FAILURE, 0, gettext ("cannot determine number of sections: %s"), elf_errmsg (-1)); @@ -652,7 +654,7 @@ process_elf_file (Dwfl_Module *dwflmod, int fd) if (print_dynamic_table) print_dynamic (ebl, ehdr); if (print_relocations) - print_relocs (pure_ebl); + print_relocs (pure_ebl, ehdr); if (print_histogram) handle_hash (ebl); if (print_symbol_table) @@ -845,7 +847,7 @@ There are %d section headers, starting at offset %#" PRIx64 ":\n\ ehdr->e_shnum, ehdr->e_shoff); /* Get the section header string table index. */ - if (unlikely (elf_getshstrndx (ebl->elf, &shstrndx) < 0)) + if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error (EXIT_FAILURE, 0, gettext ("cannot get section header string table index")); @@ -988,7 +990,7 @@ print_phdr (Ebl *ebl, GElf_Ehdr *ehdr) /* Get the section header string table index. */ size_t shstrndx; - if (unlikely (elf_getshstrndx (ebl->elf, &shstrndx) < 0)) + if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error (EXIT_FAILURE, 0, gettext ("cannot get section header string table index")); @@ -1129,7 +1131,7 @@ handle_scngrp (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr) /* Get the section header string table index. */ size_t shstrndx; - if (unlikely (elf_getshstrndx (ebl->elf, &shstrndx) < 0)) + if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error (EXIT_FAILURE, 0, gettext ("cannot get section header string table index")); @@ -1311,7 +1313,7 @@ handle_dynamic (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr) return; /* Get the section header string table index. */ - if (unlikely (elf_getshstrndx (ebl->elf, &shstrndx) < 0)) + if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error (EXIT_FAILURE, 0, gettext ("cannot get section header string table index")); @@ -1449,7 +1451,7 @@ print_dynamic (Ebl *ebl, GElf_Ehdr *ehdr) /* Print relocations. */ static void -print_relocs (Ebl *ebl) +print_relocs (Ebl *ebl, GElf_Ehdr *ehdr) { /* Find all relocation sections and handle them. */ Elf_Scn *scn = NULL; @@ -1463,9 +1465,9 @@ print_relocs (Ebl *ebl) if (likely (shdr != NULL)) { if (shdr->sh_type == SHT_REL) - handle_relocs_rel (ebl, scn, shdr); + handle_relocs_rel (ebl, ehdr, scn, shdr); else if (shdr->sh_type == SHT_RELA) - handle_relocs_rela (ebl, scn, shdr); + handle_relocs_rela (ebl, ehdr, scn, shdr); } } } @@ -1473,7 +1475,7 @@ print_relocs (Ebl *ebl) /* Handle a relocation section. */ static void -handle_relocs_rel (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr) +handle_relocs_rel (Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn, GElf_Shdr *shdr) { int class = gelf_getclass (ebl->elf); int nentries = shdr->sh_size / shdr->sh_entsize; @@ -1509,7 +1511,7 @@ handle_relocs_rel (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr) /* Get the section header string table index. */ size_t shstrndx; - if (unlikely (elf_getshstrndx (ebl->elf, &shstrndx) < 0)) + if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error (EXIT_FAILURE, 0, gettext ("cannot get section header string table index")); @@ -1545,6 +1547,7 @@ handle_relocs_rel (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr) Offset Type Value Name\n"), stdout); + int is_statically_linked = 0; for (int cnt = 0; cnt < nentries; ++cnt) { GElf_Rel relmem; @@ -1558,16 +1561,56 @@ handle_relocs_rel (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr) GELF_R_SYM (rel->r_info), &symmem, &xndx); if (unlikely (sym == NULL)) - printf (" %#0*" PRIx64 " %-20s <%s %ld>\n", - class == ELFCLASS32 ? 10 : 18, rel->r_offset, - ebl_reloc_type_check (ebl, GELF_R_TYPE (rel->r_info)) - /* Avoid the leading R_ which isn't carrying any - information. */ - ? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info), - buf, sizeof (buf)) + 2 - : gettext ("<INVALID RELOC>"), - gettext ("INVALID SYMBOL"), - (long int) GELF_R_SYM (rel->r_info)); + { + /* As a special case we have to handle relocations in static + executables. This only happens for IRELATIVE relocations + (so far). There is no symbol table. */ + if (is_statically_linked == 0) + { + /* Find the program header and look for a PT_INTERP entry. */ + is_statically_linked = -1; + if (ehdr->e_type == ET_EXEC) + { + is_statically_linked = 1; + + for (size_t inner = 0; inner < ehdr->e_phnum; ++inner) + { + GElf_Phdr phdr_mem; + GElf_Phdr *phdr = gelf_getphdr (ebl->elf, inner, + &phdr_mem); + if (phdr != NULL && phdr->p_type == PT_INTERP) + { + is_statically_linked = -1; + break; + } + } + } + } + + if (is_statically_linked > 0 && shdr->sh_link == 0) + printf ("\ + %#0*" PRIx64 " %-20s %*s %s\n", + class == ELFCLASS32 ? 10 : 18, rel->r_offset, + ebl_reloc_type_check (ebl, GELF_R_TYPE (rel->r_info)) + /* Avoid the leading R_ which isn't carrying any + information. */ + ? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info), + buf, sizeof (buf)) + 2 + : gettext ("<INVALID RELOC>"), + class == ELFCLASS32 ? 10 : 18, "", + elf_strptr (ebl->elf, shstrndx, destshdr->sh_name)); + else + printf (" %#0*" PRIx64 " %-20s <%s %ld>\n", + class == ELFCLASS32 ? 10 : 18, rel->r_offset, + ebl_reloc_type_check (ebl, GELF_R_TYPE (rel->r_info)) + /* Avoid the leading R_ which isn't carrying any + information. */ + ? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info), + buf, sizeof (buf)) + 2 + : gettext ("<INVALID RELOC>"), + gettext ("INVALID SYMBOL"), + (long int) GELF_R_SYM (rel->r_info)); + } else if (GELF_ST_TYPE (sym->st_info) != STT_SECTION) printf (" %#0*" PRIx64 " %-20s %#0*" PRIx64 " %s\n", class == ELFCLASS32 ? 10 : 18, rel->r_offset, @@ -1618,7 +1661,7 @@ handle_relocs_rel (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr) /* Handle a relocation section. */ static void -handle_relocs_rela (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr) +handle_relocs_rela (Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn, GElf_Shdr *shdr) { int class = gelf_getclass (ebl->elf); int nentries = shdr->sh_size / shdr->sh_entsize; @@ -1654,7 +1697,7 @@ handle_relocs_rela (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr) /* Get the section header string table index. */ size_t shstrndx; - if (unlikely (elf_getshstrndx (ebl->elf, &shstrndx) < 0)) + if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error (EXIT_FAILURE, 0, gettext ("cannot get section header string table index")); @@ -1676,6 +1719,7 @@ handle_relocs_rela (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr) Offset Type Value Addend Name\n"), stdout); + int is_statically_linked = 0; for (int cnt = 0; cnt < nentries; ++cnt) { GElf_Rela relmem; @@ -1690,16 +1734,57 @@ handle_relocs_rela (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr) &symmem, &xndx); if (unlikely (sym == NULL)) - printf (" %#0*" PRIx64 " %-15s <%s %ld>\n", - class == ELFCLASS32 ? 10 : 18, rel->r_offset, - ebl_reloc_type_check (ebl, GELF_R_TYPE (rel->r_info)) - /* Avoid the leading R_ which isn't carrying any - information. */ - ? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info), - buf, sizeof (buf)) + 2 - : gettext ("<INVALID RELOC>"), - gettext ("INVALID SYMBOL"), - (long int) GELF_R_SYM (rel->r_info)); + { + /* As a special case we have to handle relocations in static + executables. This only happens for IRELATIVE relocations + (so far). There is no symbol table. */ + if (is_statically_linked == 0) + { + /* Find the program header and look for a PT_INTERP entry. */ + is_statically_linked = -1; + if (ehdr->e_type == ET_EXEC) + { + is_statically_linked = 1; + + for (size_t inner = 0; inner < ehdr->e_phnum; ++inner) + { + GElf_Phdr phdr_mem; + GElf_Phdr *phdr = gelf_getphdr (ebl->elf, inner, + &phdr_mem); + if (phdr != NULL && phdr->p_type == PT_INTERP) + { + is_statically_linked = -1; + break; + } + } + } + } + + if (is_statically_linked > 0 && shdr->sh_link == 0) + printf ("\ + %#0*" PRIx64 " %-15s %*s %#6" PRIx64 " %s\n", + class == ELFCLASS32 ? 10 : 18, rel->r_offset, + ebl_reloc_type_check (ebl, GELF_R_TYPE (rel->r_info)) + /* Avoid the leading R_ which isn't carrying any + information. */ + ? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info), + buf, sizeof (buf)) + 2 + : gettext ("<INVALID RELOC>"), + class == ELFCLASS32 ? 10 : 18, "", + rel->r_addend, + elf_strptr (ebl->elf, shstrndx, destshdr->sh_name)); + else + printf (" %#0*" PRIx64 " %-15s <%s %ld>\n", + class == ELFCLASS32 ? 10 : 18, rel->r_offset, + ebl_reloc_type_check (ebl, GELF_R_TYPE (rel->r_info)) + /* Avoid the leading R_ which isn't carrying any + information. */ + ? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info), + buf, sizeof (buf)) + 2 + : gettext ("<INVALID RELOC>"), + gettext ("INVALID SYMBOL"), + (long int) GELF_R_SYM (rel->r_info)); + } else if (GELF_ST_TYPE (sym->st_info) != STT_SECTION) printf ("\ %#0*" PRIx64 " %-15s %#0*" PRIx64 " %+6" PRId64 " %s\n", @@ -1822,7 +1907,7 @@ handle_symtab (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr) /* Get the section header string table index. */ size_t shstrndx; - if (unlikely (elf_getshstrndx (ebl->elf, &shstrndx) < 0)) + if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error (EXIT_FAILURE, 0, gettext ("cannot get section header string table index")); @@ -2076,7 +2161,7 @@ handle_verneed (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr) /* Get the section header string table index. */ size_t shstrndx; - if (unlikely (elf_getshstrndx (ebl->elf, &shstrndx) < 0)) + if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error (EXIT_FAILURE, 0, gettext ("cannot get section header string table index")); @@ -2142,7 +2227,7 @@ handle_verdef (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr) /* Get the section header string table index. */ size_t shstrndx; - if (unlikely (elf_getshstrndx (ebl->elf, &shstrndx) < 0)) + if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error (EXIT_FAILURE, 0, gettext ("cannot get section header string table index")); @@ -2220,7 +2305,7 @@ handle_versym (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr) /* Get the section header string table index. */ size_t shstrndx; - if (unlikely (elf_getshstrndx (ebl->elf, &shstrndx) < 0)) + if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error (EXIT_FAILURE, 0, gettext ("cannot get section header string table index")); @@ -2717,7 +2802,7 @@ handle_hash (Ebl *ebl) { /* Get the section header string table index. */ size_t shstrndx; - if (unlikely (elf_getshstrndx (ebl->elf, &shstrndx) < 0)) + if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error (EXIT_FAILURE, 0, gettext ("cannot get section header string table index")); @@ -2753,7 +2838,7 @@ print_liblist (Ebl *ebl) /* Get the section header string table index. */ size_t shstrndx; - if (unlikely (elf_getshstrndx (ebl->elf, &shstrndx) < 0)) + if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error (EXIT_FAILURE, 0, gettext ("cannot get section header string table index")); @@ -2815,7 +2900,7 @@ print_attributes (Ebl *ebl, const GElf_Ehdr *ehdr) /* Get the section header string table index. */ size_t shstrndx; - if (unlikely (elf_getshstrndx (ebl->elf, &shstrndx) < 0)) + if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error (EXIT_FAILURE, 0, gettext ("cannot get section header string table index")); @@ -4602,7 +4687,7 @@ print_debug_frame_section (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr, { size_t shstrndx; /* We know this call will succeed since it did in the caller. */ - (void) elf_getshstrndx (ebl->elf, &shstrndx); + (void) elf_getshdrstrndx (ebl->elf, &shstrndx); const char *scnname = elf_strptr (ebl->elf, shstrndx, shdr->sh_name); Elf_Data *data = elf_rawdata (scn, NULL); @@ -6307,7 +6392,7 @@ print_debug (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr) /* Get the section header string table index. */ size_t shstrndx; - if (unlikely (elf_getshstrndx (ebl->elf, &shstrndx) < 0)) + if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error (EXIT_FAILURE, 0, gettext ("cannot get section header string table index")); @@ -7173,7 +7258,7 @@ handle_notes (Ebl *ebl, GElf_Ehdr *ehdr) { /* Get the section header string table index. */ size_t shstrndx; - if (elf_getshstrndx (ebl->elf, &shstrndx) < 0) + if (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0) error (EXIT_FAILURE, 0, gettext ("cannot get section header string table index")); @@ -7318,7 +7403,7 @@ for_each_section_argument (Elf *elf, const struct section_argument *list, { /* Get the section header string table index. */ size_t shstrndx; - if (elf_getshstrndx (elf, &shstrndx) < 0) + if (elf_getshdrstrndx (elf, &shstrndx) < 0) error (EXIT_FAILURE, 0, gettext ("cannot get section header string table index")); @@ -7387,7 +7472,7 @@ print_strings (Ebl *ebl) { /* Get the section header string table index. */ size_t shstrndx; - if (unlikely (elf_getshstrndx (ebl->elf, &shstrndx) < 0)) + if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error (EXIT_FAILURE, 0, gettext ("cannot get section header string table index")); |