[dts] [PATCH V2] disable ASLR for multi process test

[Xu, Qian Q]

+ Yuanhan here for some comments on multi process test. 
When test the application of multiprocess, do we need to disable ASLR? I am not sure if it's a point that we need to handle well in multi-process case. 

> -----Original Message-----
> From: dts [mailto:dts-bounces at dpdk.org] On Behalf Of xu,huilong
> Sent: Monday, December 26, 2016 11:12 AM
> To: dts at dpdk.org
> Cc: Xu, HuilongX <huilongx.xu at intel.com>
> Subject: [dts] [PATCH V2] disable ASLR for multi process test
> 
> Signed-off-by: xu,huilong <huilongx.xu at intel.com>
> ---
>  tests/TestSuite_multiprocess.py   | 8 +++++++-
>  tests/TestSuite_unit_tests_eal.py | 7 +++++++
>  2 files changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/tests/TestSuite_multiprocess.py b/tests/TestSuite_multiprocess.py
> index b305437..00e8e27 100644
> --- a/tests/TestSuite_multiprocess.py
> +++ b/tests/TestSuite_multiprocess.py
> @@ -57,7 +57,12 @@ class TestMultiprocess(TestCase, IxiaPacketGenerator):
> 
>          self.verify(len(self.dut.get_all_cores()) >= 4, "Not enough Cores")
>          self.tester.extend_external_packet_generator(TestMultiprocess, self)
> -
> +        try:
> +            self.aslr_flag = int(self.dut.send_expect("cat
> /proc/sys/kernel/randomize_va_space", "# "))
> +            if self.aslr_flag:
> +                self.dut.send_expect("echo 0 >
> /proc/sys/kernel/randomize_va_space", "# ")
> +        except:
> +            print "This machine not support disable ASLR, maybe multi process will
> failed"
>          out = self.dut.build_dpdk_apps("./examples/multi_process/")
>          self.verify('Error' not in out, "Compilation failed")
> 
> @@ -274,6 +279,7 @@ class TestMultiprocess(TestCase, IxiaPacketGenerator):
>          Run after each test suite.
>          """
>          self.dut.kill_all()
> +        self.dut.send_expect("echo %d >
> + /proc/sys/kernel/randomize_va_space" % self.aslr_flag, "# ")
>          self.dut.close_session(self.session_secondary)
> 
>          pass
> diff --git a/tests/TestSuite_unit_tests_eal.py b/tests/TestSuite_unit_tests_eal.py
> index d27ba39..e5c0384 100644
> --- a/tests/TestSuite_unit_tests_eal.py
> +++ b/tests/TestSuite_unit_tests_eal.py
> @@ -332,11 +332,18 @@ class TestUnitTestsEal(TestCase):
>          """
>          Run multiprocess autotest.
>          """
> +        try:
> +            aslr_flag = int(self.dut.send_expect("cat
> /proc/sys/kernel/randomize_va_space", "# "))
> +            if aslr_flag:
> +                self.dut.send_expect("echo 0 >
> /proc/sys/kernel/randomize_va_space", "# ")
> +        except:
> +            print "This machine not support disable ASLR, maybe multi process will
> failed"
> 
>          self.dut.send_expect(self.test_app_cmdline + ' -m 64', "R.*T.*E.*>.*>",
> self.start_test_time)
>          out = self.dut.send_expect("multiprocess_autotest", "RTE>>",
> self.run_cmd_time)
>          self.dut.send_expect("quit", "# ")
>          self.verify("Test OK" in out, "Test failed")
> +        self.dut.send_expect("echo %d >
> + /proc/sys/kernel/randomize_va_space" % aslr_flag, "# ")
> 
>      def test_string(self):
>          """
> --
> 1.9.3