build: Support running tests with address sanitizer

Make possible to run tests with address sanitizer to quickly check for
memory errors, although we have to disable the error exit code in case of
leaks because we have some which are due to something else down in the stack
(and LSAN suppression files doesn't allow to define the stack to ignore
as we can in valgrind).

However, we'd abort in case of memory errors anyways, so this still helps
to prevent major problems, while still logging the leaks.

In order to run pam module tests with ASAN we need to manually pass the
library to LD_PRELOAD, as we do for the wrapper.

meson.build

@@ -177,5 +177,7 @@ output += '  PAM module: ' + pam_dep.found().to_string()
 output += '  Manuals: ' + get_option('man').to_string()
 output += '  GTK Doc: ' + get_option('gtk_doc').to_string()
 output += '  XML Linter ' + xmllint.found().to_string()
+output += '\nTest setup:\n'
+output += '  With address sanitizer: ' + address_sanitizer.to_string()
 
 message('\n'+'\n'.join(output)+'\n')

tests/LSAN-leaks-suppress.txt

@@ -0,0 +1,4 @@
+leak:initialize_device
+leak:usbi_alloc_device
+leak:libusb-1.0.so.*
+leak:PyMem_RawMalloc

tests/meson.build

@@ -16,6 +16,8 @@ python_tests = [
     # }
 ]
 
+address_sanitizer = get_option('b_sanitize') == 'address'
+
 tests = [
     'fprintd',
     'test_fprintd_utils',
@@ -81,16 +83,36 @@ foreach pt: python_tests
     endforeach
 endforeach
 
-add_test_setup('default_setup',
-    is_default: true,
-    env: [
+timeout_multiplier = 1
+test_envs = [
     'G_SLICE=always-malloc',
     'MALLOC_CHECK_=2',
-        'MALLOC_PERTURB_=55',
-    ],
+]
+
+if address_sanitizer
+    timeout_multiplier = 3
+    test_envs += [
+        'ADDRESS_SANITIZER=true',
+        'ASAN_OPTIONS=@0@'.format(':'.join([
+            'abort_on_error=true',
+            'symbolize=true',
+        ])),
+        'LSAN_OPTIONS=@0@'.format(':'.join([
+            'exitcode=0',
+            'strict_string_checks=true',
+            'suppressions=@0@'.format(
+                files(meson.current_source_dir() / 'LSAN-leaks-suppress.txt')[0]),
+        ])),
+    ]
+endif
+
+add_test_setup('default_setup',
+    is_default: true,
+    env: test_envs,
+    timeout_multiplier: timeout_multiplier
 )
 
-if find_program('valgrind', required: false).found()
+if not address_sanitizer and find_program('valgrind', required: false).found()
     glib_share = glib_dep.get_pkgconfig_variable('prefix') / 'share' / glib_dep.name()
     glib_suppressions = glib_share + '/valgrind/glib.supp'
     add_test_setup('valgrind',

tests/pam/meson.build

@@ -4,11 +4,16 @@ tests = [
     'test_pam_fprintd',
 ]
 
-preloaded_libs = [
-    'pam_wrapper'
-]
+preloaded_libs = []
 pam_tests_ld_preload = []
 
+if address_sanitizer
+    # ASAN has to be the first in list
+    preloaded_libs += 'asan'
+endif
+
+preloaded_libs += 'pam_wrapper'
+
 foreach libname: preloaded_libs
     lib = run_command(meson.get_compiler('c'),
         '-print-file-name=lib@0@.so'.format(libname)