[RTEMS Project] #3605: RTL Allows Unloading a Module other Modules Depend Upon (cloned)

[RTEMS trac]

#3605: RTL Allows Unloading a Module other Modules Depend Upon (cloned)
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  Reporter:  Kevin Gordon  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  normal        |  Milestone:  5.1
 Component:  lib/dl        |    Version:  5
  Severity:  major         |   Keywords:  RTL dlopen dlcose
Blocked By:                |   Blocking:
---------------------------+-------------------------------
 Cloned from #3195:
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 Consider the following example using ELF .o files from compiled source
 files module-0.c and module-1.c from ticket #3194:

 module-0.o is loaded using dlopen() with no code or data dependencies.
 module-1.o is loaded using dlopen() with both code and data dependencies
 on module-0 which are resolved by RTL.

 The RTL function dlcose() returns no error when module-0 is unloaded, when
 it should return an error and not unload module-0. This becomes quite
 dangerous because a subsequent call to module1Function1() in the
 currently-loaded module-1.o, which accesses shared_resource_0[ ] and calls
 module0Function0(), will result in an unexpected trap on qemu or the call
 succeeding with the correct return value on hardware when it should not.

 The erroneous successful unload() of module-0 aside, it appears as though
 the resources are not actually deleted and I believe this ticket is
 related to tickets #3192 and #3194.

 Architecture is sparc-leon3 using both the RTEMS 4.11.1 public release and
 rtems master @f043b9bd3bf25626fb1a311dd7fa041eacc68adc with rtems-source-
 builder @55f2d69e9b67cde23d61375fa34ef5b0f04a985d.

 Execution environments are qemu-system-sparc and LEON3 UT700 hardware.

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Ticket URL: <http://devel.rtems.org/ticket/3605>
RTEMS Project <http://www.rtems.org/>
RTEMS Project