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core: fix vm.run(..., passio=False) handling

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Long time ago passio=True was used to replace current process with
qrexec-client directly (qvm-run --pass-io was the called), but this
behaviour is not used anymore (qvm-run was the only user). And this
option was left untouched, with misleading name - one would assume that
using passio=False should disallow any I/O, but this isn't the case.

Especially qvm-sync-clock is calling clockvm.run('...', wait=True),
default value for passio=False. This causes to output data from
untrusted VM, without sanitising terminal sequences, which can be fatal.

This patch changes passio semantic to actually do what it means - when
set to True - VM process will be able to interact with
stdin/stdout/stderr. But when set to False, all those FDs will be
connected to /dev/null.

Conflicts:
	core-modules/000QubesVm.py
This commit is contained in:
Marek Marczykowski-Górecki 2014-12-12 23:09:33 +01:00
parent 1da8ab5823
commit 73301a67c8
2 changed files with 7 additions and 12 deletions
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17
core-modules/000QubesVm.py
View File

@ -1437,19 +1437,14 @@ class QubesVm(object):
args += ["-t"]
if os.isatty(sys.stderr.fileno()):
args += ["-T"]
if passio:
if os.name == 'nt':
# wait for qrexec-client to exit, otherwise client is not properly attached to console
# if qvm-run is executed from cmd.exe
ret = subprocess.call(args)
exit(ret)
os.execv(system_path["qrexec_client_path"], args)
exit(1)
call_kwargs = {}
if ignore_stderr:
null = open("/dev/null", "w")
if ignore_stderr or not passio:
null = open("/dev/null", "rw")
call_kwargs['stderr'] = null
if not passio:
call_kwargs['stdin'] = null
call_kwargs['stdout'] = null
if passio_popen:
popen_kwargs={'stdout': subprocess.PIPE}
@ -1462,7 +1457,7 @@ class QubesVm(object):
if null:
null.close()
return p
if not wait:
if not wait and not passio:
args += ["-e"]
retcode = subprocess.call(args, **call_kwargs)
if null:

2
qvm-tools/qvm-run
View File

@ -60,7 +60,7 @@ def vm_run_cmd(vm, cmd, options):
verbose = options.verbose,
user = options.user,
notify_function = tray_notify_generic if options.tray else None,
wait = options.passio, localcmd = options.localcmd,
passio = options.passio, localcmd = options.localcmd,
gui = options.gui, filter_esc = options.filter_esc)
except QubesException as err:
if options.passio and options.color_output is not None: