[lit] Add SANITIZER_IGNORE_CVE_2016_2143 to pass_vars.

[• koriakin]

Summary

This variable is used by ASan (and other sanitizers in the future)
on s390x-linux to override a check for CVE-2016-2143 in the running
kernel (see revision 267747 on compiler-rt). Since the check simply
checks if the kernel version is in a whitelist of known-good versions,
it may miss distribution kernels, or manually-patched kernels - hence
the need for this variable. To enable running the ASan testsuite on
such kernels, this variable should be passed from the environment
down to the testcases.

[• koriakin]

Ping?

[• koriakin]

Ping?

[• koriakin]

Ping?

[• koriakin]

Ping?

[• ddunbar]

I have no objection.

llvm/trunk/utils/lit/lit/TestingConfig.py

def fromdefaults(litConfig):
         environment = {
             'PATH' : os.pathsep.join(litConfig.path +
                                      [os.environ.get('PATH','')]),
             'LLVM_DISABLE_CRASH_REPORT' : '1',
             }
 
         pass_vars = ['LIBRARY_PATH', 'LD_LIBRARY_PATH', 'SYSTEMROOT', 'TERM',
                      'LD_PRELOAD', 'ASAN_OPTIONS', 'UBSAN_OPTIONS',
-                     'LSAN_OPTIONS', 'ADB', 'ANDROID_SERIAL']
+                     'LSAN_OPTIONS', 'ADB', 'ANDROID_SERIAL',
+                     'SANITIZER_IGNORE_CVE_2016_2143']
         for var in pass_vars:
             val = os.environ.get(var, '')
             # Check for empty string as some variables such as LD_PRELOAD cannot be empty
             # ('') for OS's such as OpenBSD.
             if val:
                 environment[var] = val
 
         if sys.platform == 'win32':