Sanity check reloc count in get_reloc_upper_bound

The idea here is the stop tools from allocating up to 32G per section
for the arelent pointer array, only to find a little later that the
section reloc count was fuzzed.  This usually doesn't hurt much (on
systems that allow malloc overcommit) except when compiled with asan.

We already do this for ELF targets, and while fixing the logic
recently I decided other targets ought to do the same.

	* elf64-sparc.c (elf64_sparc_get_reloc_upper_bound): Sanity check
	section reloc count against file size.
	* mach-o.c (bfd_mach_o_get_reloc_upper_bound): Likewise.
	* aoutx.h (get_reloc_upper_bound): Likewise, and don't duplicate
	check done in bfd_get_reloc_upper_bound.
	* pdp11.c (get_reloc_upper_bound): Likewise.
	* coffgen.c (coff_get_reloc_upper_bound): Likewise.

1 files changed, 12 insertions, 8 deletions

diff --git a/bfd/aoutx.h b/bfd/aoutx.h
index 4aed23426ca..61ea9f7ce04 100644
--- a/bfd/aoutx.h
+++ b/bfd/aoutx.h
@@ -2485,13 +2485,7 @@ NAME (aout, canonicalize_reloc) (bfd *abfd,
 long
 NAME (aout, get_reloc_upper_bound) (bfd *abfd, sec_ptr asect)
 {
-  bfd_size_type count;
-
-  if (bfd_get_format (abfd) != bfd_object)
-    {
-      bfd_set_error (bfd_error_invalid_operation);
-      return -1;
-    }
+  size_t count, raw;
 
   if (asect->flags & SEC_CONSTRUCTOR)
     count = asect->reloc_count;
@@ -2507,11 +2501,21 @@ NAME (aout, get_reloc_upper_bound) (bfd *abfd, sec_ptr asect)
       return -1;
     }
 
-  if (count >= LONG_MAX / sizeof (arelent *))
+  if (count >= LONG_MAX / sizeof (arelent *)
+      || _bfd_mul_overflow (count, obj_reloc_entry_size (abfd), &raw))
     {
       bfd_set_error (bfd_error_file_too_big);
       return -1;
     }
+  if (!bfd_write_p (abfd))
+    {
+      ufile_ptr filesize = bfd_get_file_size (abfd);
+      if (filesize != 0 && raw > filesize)
+	{
+	  bfd_set_error (bfd_error_file_truncated);
+	  return -1;
+	}
+    }
   return (count + 1) * sizeof (arelent *);
 }