Prevent illegal memory accesses when parsing incorrecctly formated core notes.

	PR 22421
	* elf.c (elfcore_grok_netbsd_procinfo): Check that the note is big enough.
	(elfcore_grok_openbsd_procinfo): Likewise.
	(elfcore_grok_nto_status): Likewise.

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 8e358dd..8ac7765 100644 (file)
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,5 +1,12 @@
 2017-11-16  Nick Clifton  <nickc@redhat.com>
 
+       PR 22421
+       * elf.c (elfcore_grok_netbsd_procinfo): Check that the note is big enough.
+       (elfcore_grok_openbsd_procinfo): Likewise.
+       (elfcore_grok_nto_status): Likewise.
+
+2017-11-16  Nick Clifton  <nickc@redhat.com>
+
        * merge.c (sec_merge_emit): Always create padding buffer.  Add
        asserts to make sure that the buffer is long enough.
 

diff --git a/bfd/elf.c b/bfd/elf.c
index 694e435..93ed443 100644 (file)
--- a/bfd/elf.c
+++ b/bfd/elf.c
@@ -9871,6 +9871,7 @@ elfcore_grok_freebsd_psinfo (bfd *abfd, Elf_Internal_Note *note)
   /* Check for version 1 in pr_version.  */
   if (bfd_h_get_32 (abfd, (bfd_byte *) note->descdata) != 1)
     return FALSE;
+
   offset = 4;
 
   /* Skip over pr_psinfosz. */
@@ -10051,6 +10052,9 @@ elfcore_netbsd_get_lwpid (Elf_Internal_Note *note, int *lwpidp)
 static bfd_boolean
 elfcore_grok_netbsd_procinfo (bfd *abfd, Elf_Internal_Note *note)
 {
+  if (note->descsz <= 0x7c + 31)
+    return FALSE;
+
   /* Signal number at offset 0x08. */
   elf_tdata (abfd)->core->signal
     = bfd_h_get_32 (abfd, (bfd_byte *) note->descdata + 0x08);
@@ -10135,6 +10139,9 @@ elfcore_grok_netbsd_note (bfd *abfd, Elf_Internal_Note *note)
 static bfd_boolean
 elfcore_grok_openbsd_procinfo (bfd *abfd, Elf_Internal_Note *note)
 {
+  if (note->descsz <= 0x48 + 31)
+    return FALSE;
+
   /* Signal number at offset 0x08. */
   elf_tdata (abfd)->core->signal
     = bfd_h_get_32 (abfd, (bfd_byte *) note->descdata + 0x08);
@@ -10206,6 +10213,9 @@ elfcore_grok_nto_status (bfd *abfd, Elf_Internal_Note *note, long *tid)
   short sig;
   unsigned flags;
 
+  if (note->descsz < 16)
+    return FALSE;
+
   /* nto_procfs_status 'pid' field is at offset 0.  */
   elf_tdata (abfd)->core->pid = bfd_get_32 (abfd, (bfd_byte *) ddata);