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| author | Alan Modra <amodra@gmail.com> | 2018-05-18 17:09:45 +0930 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2018-05-18 18:32:35 +0930 |
| commit | 4bba0fb1c6d391a217c25e44398a7e1c7090155f (patch) | |
| tree | fff53de71569f3b7dd7a12cb1f3de54b043c8ae0 /bfd | |
| parent | 8722de9c419c98ce2fb1f294097244c0bc45e030 (diff) | |
| download | gdb-4bba0fb1c6d391a217c25e44398a7e1c7090155f.zip gdb-4bba0fb1c6d391a217c25e44398a7e1c7090155f.tar.gz gdb-4bba0fb1c6d391a217c25e44398a7e1c7090155f.tar.bz2 | |
PR23199, Invalid SHT_GROUP entry leads to group confusion
This patch prevents elf_next_in_group list pointer confusion when
SHT_GROUP sections specify other SHT_GROUP sections in their list of
group sections.
PR 23199
* elf.c (setup_group): Formatting. Check that SHT_GROUP entries
don't point at other SHT_GROUP sections. Set shdr corresponding
to invalid entry, to NULL rather than section 0. Identify
SHT_GROUP section index when reporting an error. Cope with NULL
shdr pointer.
Diffstat (limited to 'bfd')
| -rw-r--r-- | bfd/ChangeLog | 9 | ||||
| -rw-r--r-- | bfd/elf.c | 17 |
2 files changed, 20 insertions, 6 deletions
diff --git a/bfd/ChangeLog b/bfd/ChangeLog index 3b5774a..f0ea6f9 100644 --- a/bfd/ChangeLog +++ b/bfd/ChangeLog @@ -1,5 +1,14 @@ 2018-05-18 Alan Modra <amodra@gmail.com> + PR 23199 + * elf.c (setup_group): Formatting. Check that SHT_GROUP entries + don't point at other SHT_GROUP sections. Set shdr corresponding + to invalid entry, to NULL rather than section 0. Identify + SHT_GROUP section index when reporting an error. Cope with NULL + shdr pointer. + +2018-05-18 Alan Modra <amodra@gmail.com> + * libbfd-in.h (ATTRIBUTE_HIDDEN): Define and use throughout. * configure.ac (HAVE_HIDDEN): Check compiler support for hidden visibility. @@ -628,7 +628,8 @@ setup_group (bfd *abfd, Elf_Internal_Shdr *hdr, asection *newsect) bfd_alloc2 (abfd, num_group, sizeof (Elf_Internal_Shdr *)); if (elf_tdata (abfd)->group_sect_ptr == NULL) return FALSE; - memset (elf_tdata (abfd)->group_sect_ptr, 0, num_group * sizeof (Elf_Internal_Shdr *)); + memset (elf_tdata (abfd)->group_sect_ptr, 0, + num_group * sizeof (Elf_Internal_Shdr *)); num_group = 0; for (i = 0; i < shnum; i++) @@ -709,13 +710,16 @@ setup_group (bfd *abfd, Elf_Internal_Shdr *hdr, asection *newsect) |= SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD; break; } - if (idx >= shnum) + if (idx < shnum) + dest->shdr = elf_elfsections (abfd)[idx]; + if (idx >= shnum + || dest->shdr->sh_type == SHT_GROUP) { _bfd_error_handler - (_("%pB: invalid SHT_GROUP entry"), abfd); - idx = 0; + (_("%pB: invalid entry in SHT_GROUP section [%u]"), + abfd, i); + dest->shdr = NULL; } - dest->shdr = elf_elfsections (abfd)[idx]; } } } @@ -781,7 +785,8 @@ setup_group (bfd *abfd, Elf_Internal_Shdr *hdr, asection *newsect) idx = (Elf_Internal_Group *) shdr->contents; n_elt = shdr->sh_size / 4; while (--n_elt != 0) - if ((s = (++idx)->shdr->bfd_section) != NULL + if ((++idx)->shdr != NULL + && (s = idx->shdr->bfd_section) != NULL && elf_next_in_group (s) != NULL) break; if (n_elt != 0) |