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Fix a seg-fault when displaying notes from a prorgam segment. Check for a NULL string section before attempting compute the name of a separate debug info file. 

PR 22490
	* readelf.c (dump_section_as_bytes): Check for a NULL string
	section pointer.
	(process_notes_at): Compute the alignment to use if displaying
	notes from a segment.
This commit is contained in:
Nick Clifton 2017-11-27 11:05:39 +00:00
parent e3d4058216
commit 4dff97b2ce
2 changed files with 29 additions and 11 deletions
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8
binutils/ChangeLog
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@ -1,3 +1,11 @@
2017-11-27 Nick Clifton <nickc@redhat.com>
PR 22490
* readelf.c (dump_section_as_bytes): Check for a NULL string
section pointer.
(process_notes_at): Compute the alignment to use if displaying
notes from a segment.
2017-11-26 H.J. Lu <hongjiu.lu@intel.com>
* dwarf.c (load_separate_debug_info): Rename argument name from

32
binutils/readelf.c
View File

@ -13581,7 +13581,7 @@ load_debug_section (enum dwarf_section_display_enum debug, void * data)
/* Read in the string table, so that we have section names to scan. */
strs = filedata->section_headers + filedata->file_header.e_shstrndx;
if (strs->sh_size != 0)
if (strs != NULL && strs->sh_size != 0)
{
filedata->string_table = (char *) get_data (NULL, filedata, strs->sh_offset,
1, strs->sh_size,
@ -17908,8 +17908,9 @@ process_notes_at (Filedata * filedata,
{
Elf_External_Note * pnotes;
Elf_External_Note * external;
char * end;
bfd_boolean res = TRUE;
char * end;
bfd_boolean res = TRUE;
size_t align;
if (length <= 0)
return FALSE;
@ -17922,10 +17923,21 @@ process_notes_at (Filedata * filedata,
if (! apply_relocations (filedata, section, (unsigned char *) pnotes, length, NULL, NULL))
return FALSE;
}
align = section->sh_addralign;
}
else
pnotes = (Elf_External_Note *) get_data (NULL, filedata, offset, 1, length,
{
pnotes = (Elf_External_Note *) get_data (NULL, filedata, offset, 1, length,
_("notes"));
/* FIXME: Core notes seem to be produced with
4-byte alignment even on 64-bit systems. */
if (filedata->file_header.e_type == ET_CORE)
align = 4;
else
align = is_32bit_elf ? 4 : 4;
}
if (pnotes == NULL)
return FALSE;
@ -17944,7 +17956,7 @@ process_notes_at (Filedata * filedata,
{
Elf_Internal_Note inote;
size_t min_notesz;
char *next;
char * next;
char * temp = NULL;
size_t data_remaining = end - (char *) external;
@ -17970,12 +17982,10 @@ process_notes_at (Filedata * filedata,
inote.namedata = external->name;
inote.descsz = BYTE_GET (external->descsz);
inote.descdata = ((char *) external
+ ELF_NOTE_DESC_OFFSET (inote.namesz,
section->sh_addralign));
+ ELF_NOTE_DESC_OFFSET (inote.namesz, align));
inote.descpos = offset + (inote.descdata - (char *) pnotes);
next = ((char *) external
+ ELF_NOTE_NEXT_OFFSET (inote.namesz, inote.descsz,
section->sh_addralign));
+ ELF_NOTE_NEXT_OFFSET (inote.namesz, inote.descsz, align));
}
else
{
@ -18016,8 +18026,8 @@ process_notes_at (Filedata * filedata,
{
warn (_("note with invalid namesz and/or descsz found at offset 0x%lx\n"),
(unsigned long) ((char *) external - (char *) pnotes));
warn (_(" type: 0x%lx, namesize: 0x%08lx, descsize: 0x%08lx\n"),
inote.type, inote.namesz, inote.descsz);
warn (_(" type: 0x%lx, namesize: 0x%08lx, descsize: 0x%08lx, alignment: %u\n"),
inote.type, inote.namesz, inote.descsz, (int) align);
break;
}