[Bug 224875] kldxref fails if a mod_depend md_cval is too close to the end of allocated sections

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224875

--- Comment #4 from commit-hook at freebsd.org ---
A commit references this bug:

Author: emaste
Date: Tue Jan 16 18:20:12 UTC 2018
New revision: 328052
URL: https://svnweb.freebsd.org/changeset/base/328052

Log:
  kldxref: handle modules with md_cval at the end of allocated sections

  Attempting to retrieve an md_cval string from a kernel module with
  kldxref would throw a offset error for modules created using lld, since
  this value would be placed at the end of all allocated sections.

  Add an ef_read_seg_string method to the ef interface, to allow reading
  strings of varying size without attempting to read beyond the segment's
  bounds.

  PR:           224875
  Submitted by: Mitchell Horne <mhorne063 at gmail.com>
  Reviewed by:  cem, kib
  Sponsored by: The FreeBSD Foundation
  Differential Revision:        https://reviews.freebsd.org/D13923

Changes:
  head/usr.sbin/kldxref/ef.c
  head/usr.sbin/kldxref/ef.h
  head/usr.sbin/kldxref/ef_obj.c
  head/usr.sbin/kldxref/kldxref.c

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