[SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-1.2-426-gb80995d

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- Log -----------------------------------------------------------------
commit b80995d36d1e6b56ddb3c78a61d9dd41a2908421
Author: Mark Wielaard <mjw@redhat.com>
Date:   Wed Jul 7 16:51:25 2010 +0200

    Sanitize before usage in unwinder if they come from task_pt_regs.
    
    Introduce _stp_task_pt_regs_valid() that checks whether a full set
    of user registers was saved. Currently assumes yes for i386 and no otherwise.
    If not all registers were saved create a copy for the unwinder with
    everything zeroed out except the (arch specific, x86_64 only for now)
    known to be valid registers (would be nicer to do this as initial
    unwinder state, so we could mark them undefined, but the current
    form at least prevents leaking any data that might still be saved
    in the pt_regs that task_pt_regs() points to).
    
    * runtime/compatdefs.h (_stp_task_pt_regs_valid): New function.
    * runtime/stack.c (_stp_stack_print): Take and pass uregs_valid argument.
      (_stp_stack_sprint): Likewise.
    * runtime/stack-arm.c (__stp_stack_print): Likewise.
    * runtime/stack-i386.c (__stp_stack_print): Likewise.
    * runtime/stack-ia64.c (__stp_stack_print): Likewise.
    * runtime/stack-ppc.c (__stp_stack_print): Likewise.
    * runtime/stack-s390.c (__stp_stack_print): Likewise.
    * runtime/stack-x86_64.c (__stp_stack_print): Likewise.
    * tapset/context-unwind.stp (print_backtrace): Pass zero for valid.
      (sprint_backtrace): Likewise.
      (backtrace): Likewise.
    * tapset/ucontext-unwind.stp (print_ubacktrace): Check and pass uregs_valid.
      (sprint_ubacktrace): Likewise.
      (print_ubacktrace_brief): Likewise.
      (ubacktrace): Likewise.
    * runtime/unwind/i386.h (arch_unw_init_frame_info): Accept sanitize argument.
    * runtime/stack-x86_64.c (arch_unw_init_frame_info): Likewise and actually
      sanitize the pt_regs copy.

-----------------------------------------------------------------------

Summary of changes:
 runtime/compatdefs.h       |   22 ++++++++++++++++++
 runtime/stack-arm.c        |    3 +-
 runtime/stack-i386.c       |    8 ++++--
 runtime/stack-ia64.c       |    2 +-
 runtime/stack-ppc.c        |    3 +-
 runtime/stack-s390.c       |    2 +-
 runtime/stack-x86_64.c     |    6 +++-
 runtime/stack.c            |   11 ++++++---
 runtime/unwind/i386.h      |    6 ++++-
 runtime/unwind/x86_64.h    |   24 ++++++++++++++++++-
 tapset/context-unwind.stp  |    6 ++--
 tapset/ucontext-unwind.stp |   52 +++++++++++++++++++++++++++++++++----------
 12 files changed, 114 insertions(+), 31 deletions(-)


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systemtap: system-wide probe/trace tool