PR29922, SHT_NOBITS section avoids section size sanity check
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Commit Message
PR 29922
* dwarf2.c (find_debug_info): Ignore sections without
SEC_HAS_CONTENTS.
@@ -4831,16 +4831,19 @@ find_debug_info (bfd *abfd, const struct dwarf_debug_section *debug_sections,
{
look = debug_sections[debug_info].uncompressed_name;
msec = bfd_get_section_by_name (abfd, look);
- if (msec != NULL)
+ /* Testing SEC_HAS_CONTENTS is an anti-fuzzer measure. Of
+ course debug sections always have contents. */
+ if (msec != NULL && (msec->flags & SEC_HAS_CONTENTS) != 0)
return msec;
look = debug_sections[debug_info].compressed_name;
msec = bfd_get_section_by_name (abfd, look);
- if (msec != NULL)
+ if (msec != NULL && (msec->flags & SEC_HAS_CONTENTS) != 0)
return msec;
for (msec = abfd->sections; msec != NULL; msec = msec->next)
- if (startswith (msec->name, GNU_LINKONCE_INFO))
+ if ((msec->flags & SEC_HAS_CONTENTS) != 0
+ && startswith (msec->name, GNU_LINKONCE_INFO))
return msec;
return NULL;
@@ -4848,6 +4851,9 @@ find_debug_info (bfd *abfd, const struct dwarf_debug_section *debug_sections,
for (msec = after_sec->next; msec != NULL; msec = msec->next)
{
+ if ((msec->flags & SEC_HAS_CONTENTS) == 0)
+ continue;
+
look = debug_sections[debug_info].uncompressed_name;
if (strcmp (msec->name, look) == 0)
return msec;