qemu/scripts
Michael Roth fc13d93726 qapi: zero-initialize all QMP command parameters
In general QMP command parameter values are specified by consumers of the
QMP/HMP interface, but in the case of optional parameters these values may
be left uninitialized.

It is considered a bug for code to make use of optional parameters that have
not been flagged as being present by the marshalling code (via corresponding
has_<parameter> parameter), however our marshalling code will still pass
these uninitialized values on to the corresponding QMP function (to then
be ignored). Some compilers (clang in particular) consider this unsafe
however, and generate warnings as a result. As reported by Peter Maydell:

  This is something clang's -fsanitize=undefined spotted. The
  code generated by qapi-commands.py in qmp-marshal.c for
  qmp_marshal_* functions where there are some optional
  arguments looks like this:

      bool has_force = false;
      bool force;

      mi = qmp_input_visitor_new_strict(QOBJECT(args));
      v = qmp_input_get_visitor(mi);
      visit_type_str(v, &device, "device", errp);
      visit_start_optional(v, &has_force, "force", errp);
      if (has_force) {
          visit_type_bool(v, &force, "force", errp);
      }
      visit_end_optional(v, errp);
      qmp_input_visitor_cleanup(mi);

      if (error_is_set(errp)) {
          goto out;
      }
      qmp_eject(device, has_force, force, errp);

  In the case where has_force is false, we never initialize
  force, but then we use it by passing it to qmp_eject.
  I imagine we don't then actually use the value, but clang
  complains in particular for 'bool' variables because the value
  that ends up being loaded from memory for 'force' is not either
  0 or 1 (being uninitialized stack contents).

Fix this by initializing all QMP command parameters to {0} in the
marshalling code prior to passing them on to the QMP functions.

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Reported-by: Peter Maydell <peter.maydell@linaro.org>
Tested-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2014-05-21 09:25:31 -04:00
..
kvm vmxcap: Update according to SDM of January 2013 2013-04-17 23:27:24 -03:00
qemu-guest-agent qemu-ga: sample fsfreeze hooks 2013-01-08 16:38:12 -06:00
qmp qmp: Check for returned data from __json_read in get_events 2014-02-28 13:35:53 -05:00
tracetool trace: [tracetool] Minimize the amount of per-backend code 2014-05-07 19:07:18 +02:00
acpi_extract_preprocess.py i386: add ACPI table files from seabios 2013-10-14 17:48:51 +03:00
acpi_extract.py i386: add ACPI table files from seabios 2013-10-14 17:48:51 +03:00
analyse-9p-simpletrace.py scripts/analyse-9p-simpletrace.py: Add symbolic names for 9p operations. 2011-12-21 12:37:23 +05:30
check-qerror.sh qerror: add check-qerror.sh to verify alphabetical order 2012-01-18 10:23:39 -02:00
checkpatch.pl checkpatch.pl: Check .cpp files 2013-09-09 14:17:56 -05:00
cleanup-trace-events.pl cleanup-trace-events.pl: New 2013-07-18 11:44:42 +08:00
coverity-model.c scripts: add sample model file for Coverity Scan 2014-04-18 10:33:36 +04:00
create_config module: implement module loading 2014-02-20 13:14:18 +01:00
disas-objdump.pl disas-objdump: Pass --adjust-vma to objdump 2013-08-24 07:26:45 +02:00
dump-guest-memory.py Python-lang gdb script to extract x86_64 guest vmcore from qemu coredump 2014-01-26 13:06:48 +02:00
extract-vsssdk-headers Add a script to extract VSS SDK headers on POSIX system 2013-09-09 14:17:56 -05:00
feature_to_c.sh exec: move include files to include/exec/ 2012-12-19 08:31:31 +01:00
get_maintainer.pl Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
gtester-cat test makefile overhaul 2012-03-30 08:14:11 -05:00
hxtool vl.c: In qemu -h output, only print options for the arch we are running as 2011-12-19 10:27:33 -06:00
make_device_config.sh make_device_config.sh: Emit dependency file to directory where included 2013-03-09 12:00:03 +00:00
make-release make-release: Record SeaBIOS version 2014-03-31 15:02:04 +01:00
ordereddict.py qapi: add ordereddict.py helper library 2011-07-21 16:48:14 -03:00
qapi-commands.py qapi: zero-initialize all QMP command parameters 2014-05-21 09:25:31 -04:00
qapi-types.py qapi: Use an explicit input file 2014-05-08 14:19:58 -04:00
qapi-visit.py qapi: Replace uncommon use of the error API by the common one 2014-05-15 14:00:46 -04:00
qapi.py scripts/qapi.py: Avoid syntax not supported by Python 2.4 2014-05-21 09:04:03 -04:00
qemu-binfmt-conf.sh scripts/qemu-binfmt-conf.sh: Add AArch64 registration 2014-03-17 16:31:53 +00:00
qemu-gdb.py scripts: add gdb support script 2012-03-24 12:57:02 +00:00
qtest qtest: add test framework 2012-03-30 08:14:11 -05:00
refresh-pxe-roms.sh roms: rewrite scripts/refresh-pxe-roms.sh 2013-09-30 09:44:35 +02:00
signrom.py signrom: Rewrite as python script 2012-04-16 15:41:20 +02:00
simpletrace.py trace: [tracetool] Minimize the amount of per-backend code 2014-05-07 19:07:18 +02:00
switch-timer-api misc: Fix case Qemu -> QEMU 2014-02-15 16:10:25 +04:00
texi2pod.pl Support utf8 chars in pod docs 2012-03-24 14:10:25 +00:00
tracetool.py build: do not use TARGET_ARCH 2013-06-14 15:33:10 +01:00
update-acpi.sh acpi: add rules to compile ASL source 2013-10-14 17:48:51 +03:00
update-linux-headers.sh powerpc: linux header sync script includes epapr_hcalls.h 2013-01-07 17:37:09 +01:00