[Bug 1648901] Re: SPNEGO crash on mechanism failure

Eric Desrochers eric.desrochers at canonical.com
Mon Jan 16 15:23:32 UTC 2017


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Title:
  SPNEGO crash on mechanism failure

Status in krb5 package in Ubuntu:
  Fix Released
Status in krb5 source package in Xenial:
  In Progress

Bug description:
  == SRU JUSTIFICATION ==

  [Impact]

  * Chrome (and other things) crash (segfault) when Kerberos fails to
  authenticate.

  Thread 22 "Chrome_IOThread" received signal SIGSEGV, Segmentation fault.
  [Switching to Thread 0x7fffdd687700 (LWP 14851)]
  spnego_gss_inquire_context (minor_status=0x7fffdd68573c, context_handle=0x0, src_name=0x7fffdd685670, targ_name=0x7fffdd685668,
      lifetime_rec=0x7fffdd685738, mech_type=0x7fffdd685660, ctx_flags=0x7fffdd685734, locally_initiated=0x7fffdd685730, opened=0x7fffdd68572c)
      at ../../../../src/lib/gssapi/spnego/spnego_mech.c:2315
  2315 ../../../../src/lib/gssapi/spnego/spnego_mech.c: No such file or directory.
  (gdb) bt
  #0 spnego_gss_inquire_context (minor_status=0x7fffdd68573c, context_handle=0x0, src_name=0x7fffdd685670, targ_name=0x7fffdd685668,
      lifetime_rec=0x7fffdd685738, mech_type=0x7fffdd685660, ctx_flags=0x7fffdd685734, locally_initiated=0x7fffdd685730, opened=0x7fffdd68572c)
      at ../../../../src/lib/gssapi/spnego/spnego_mech.c:2315
  #1 0x00007fffef72be54 in gss_inquire_context (minor_status=0x7fffdd68573c, context_handle=<optimized out>, src_name=0x7fffdd685788,
      targ_name=0x7fffdd685750, lifetime_rec=0x7fffdd685738, mech_type=0x7fffdd685780, ctx_flags=0x7fffdd685734, locally_initiated=0x7fffdd685730,
      opened=0x7fffdd68572c) at ../../../../src/lib/gssapi/mechglue/g_inq_context.c:114

  
  * context_handle=0x0, segfault occurs trying to dereference a null pointer.

  [Test Case]

   * Reproducer

  See dwmw2's (reporter of the bug) comment #3 :
  https://bugs.launchpad.net/ubuntu/+source/krb5/+bug/1648901/comments/3

  
  [Regression Potential]

   * none expected Y and Z release already has the krb5 upstream patch.
   * Debian has the patch as well.

  [Other Info]

   * Upstream fix :
  https://github.com/krb5/krb5/commit/3beb564cea3d219efcf71682b6576cad548c2d23

  * Pull Request :
  https://github.com/krb5/krb5/pull/385

  * Chrome Bug :
  https://bugs.chromium.org/p/chromium/issues/detail?id=554905

  * A test pkg including the upstream commit has been proven to fix the
  crash. See:
  https://bugs.launchpad.net/ubuntu/xenial/+source/krb5/+bug/1648901/comments/9

  ==

  [Original Description]

  Chrome (and other things) crash when Kerberos fails to authenticate:
  https://bugs.chromium.org/p/chromium/issues/detail?id=554905

  This was fixed in MIT krb5 in January:
  https://github.com/krb5/krb5/pull/385

  Thread 22 "Chrome_IOThread" received signal SIGSEGV, Segmentation fault.
  [Switching to Thread 0x7fffdd687700 (LWP 14851)]
  spnego_gss_inquire_context (minor_status=0x7fffdd68573c, context_handle=0x0, src_name=0x7fffdd685670, targ_name=0x7fffdd685668,
      lifetime_rec=0x7fffdd685738, mech_type=0x7fffdd685660, ctx_flags=0x7fffdd685734, locally_initiated=0x7fffdd685730, opened=0x7fffdd68572c)
      at ../../../../src/lib/gssapi/spnego/spnego_mech.c:2315
  2315	../../../../src/lib/gssapi/spnego/spnego_mech.c: No such file or directory.
  (gdb) bt
  #0  spnego_gss_inquire_context (minor_status=0x7fffdd68573c, context_handle=0x0, src_name=0x7fffdd685670, targ_name=0x7fffdd685668,
      lifetime_rec=0x7fffdd685738, mech_type=0x7fffdd685660, ctx_flags=0x7fffdd685734, locally_initiated=0x7fffdd685730, opened=0x7fffdd68572c)
      at ../../../../src/lib/gssapi/spnego/spnego_mech.c:2315
  #1  0x00007fffef72be54 in gss_inquire_context (minor_status=0x7fffdd68573c, context_handle=<optimized out>, src_name=0x7fffdd685788,
      targ_name=0x7fffdd685750, lifetime_rec=0x7fffdd685738, mech_type=0x7fffdd685780, ctx_flags=0x7fffdd685734, locally_initiated=0x7fffdd685730,
      opened=0x7fffdd68572c) at ../../../../src/lib/gssapi/mechglue/g_inq_context.c:114

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