[GIT PULL] uprobes: longjmp / special-mapping fixes

[Oleg Nesterov <oleg@redhat.com>]

Ingo, please pull from

  git://git.kernel.org/pub/scm/linux/kernel/git/oleg/misc uprobes/core

Based on tip:perf/core


Currently ret-probes can't work (the application will likely crash)
if the probed function does not return, and this is even documented
in handle_trampoline(). This  tries to make the first step to fix
the problem, assuming that the probed functions use the same stack.

Also, xol_add_vma() doesn't use install_special_mapping() correctly,
and we can name the xol vma which currently looks like anon mapping.


Oleg Nesterov (14):
      uprobes: Introduce get_uprobe()
      uprobes: Introduce free_ret_instance()
      uprobes: Send SIGILL if handle_trampoline() fails
      uprobes: Change prepare_uretprobe() to use uprobe_warn()
      uprobes: Change handle_trampoline() to find the next chain beforehand
      uprobes: Export struct return_instance, introduce arch_uretprobe_is_alive()
      uprobes/x86: Reimplement arch_uretprobe_is_alive()
      uprobes: Change handle_trampoline() to flush the frames invalidated by longjmp()
      uprobes: Change prepare_uretprobe() to (try to) flush the dead frames
      uprobes: Add the "enum rp_check ctx" arg to arch_uretprobe_is_alive()
      uprobes/x86: Make arch_uretprobe_is_alive(RP_CHECK_CALL) more clever
      uprobes: fix the usage of install_special_mapping()
      uprobes: use vm_special_mapping to name the xol vma
      uprobes: fix the waitqueue_active() check in xol_free_insn_slot()

 arch/x86/kernel/uprobes.c |    9 ++
 include/linux/uprobes.h   |   17 ++++
 kernel/events/uprobes.c   |  228 ++++++++++++++++++++++++++-------------------
 3 files changed, 156 insertions(+), 98 deletions(-)