diff options
Diffstat (limited to 'bfd/elfcode.h')
| -rw-r--r-- | bfd/elfcode.h | 31 |
1 files changed, 22 insertions, 9 deletions
diff --git a/bfd/elfcode.h b/bfd/elfcode.h index fbf1c3fea5..b7832954bd 100644 --- a/bfd/elfcode.h +++ b/bfd/elfcode.h @@ -459,6 +459,25 @@ elf_file_p (Elf_External_Ehdr *x_ehdrp) && (x_ehdrp->e_ident[EI_MAG3] == ELFMAG3)); } +/* Determines if a given section index is valid. */ + +static inline bfd_boolean +valid_section_index_p (unsigned index, unsigned num_sections) +{ + /* Note: We allow SHN_UNDEF as a valid section index. */ + if (index < SHN_LORESERVE || index > SHN_HIRESERVE) + return index < num_sections; + + /* We disallow the use of reserved indcies, except for those + with OS or Application specific meaning. The test make use + of the knowledge that: + SHN_LORESERVE == SHN_LOPROC + and + SHN_HIPROC == SHN_LOOS - 1 */ + /* XXX - Should we allow SHN_XINDEX as a valid index here ? */ + return (index >= SHN_LOPROC && index <= SHN_HIOS); +} + /* Check to see if the file associated with ABFD matches the target vector that ABFD points to. @@ -712,17 +731,13 @@ elf_object_p (bfd *abfd) elf_swap_shdr_in (abfd, &x_shdr, i_shdrp + shindex); /* Sanity check sh_link and sh_info. */ - if (i_shdrp[shindex].sh_link >= num_sec - || (i_shdrp[shindex].sh_link >= SHN_LORESERVE - && i_shdrp[shindex].sh_link <= SHN_HIRESERVE)) + if (! valid_section_index_p (i_shdrp[shindex].sh_link, num_sec)) goto got_wrong_format_error; if (((i_shdrp[shindex].sh_flags & SHF_INFO_LINK) || i_shdrp[shindex].sh_type == SHT_RELA || i_shdrp[shindex].sh_type == SHT_REL) - && (i_shdrp[shindex].sh_info >= num_sec - || (i_shdrp[shindex].sh_info >= SHN_LORESERVE - && i_shdrp[shindex].sh_info <= SHN_HIRESERVE))) + && ! valid_section_index_p (i_shdrp[shindex].sh_info, num_sec)) goto got_wrong_format_error; /* If the section is loaded, but not page aligned, clear @@ -740,9 +755,7 @@ elf_object_p (bfd *abfd) /* A further sanity check. */ if (i_ehdrp->e_shnum != 0) { - if (i_ehdrp->e_shstrndx >= elf_numsections (abfd) - || (i_ehdrp->e_shstrndx >= SHN_LORESERVE - && i_ehdrp->e_shstrndx <= SHN_HIRESERVE)) + if (! valid_section_index_p (i_ehdrp->e_shstrndx, elf_numsections (abfd))) { /* PR 2257: We used to just goto got_wrong_format_error here |
