Merge tag 'linux_kselftest-kunit-6.13-rc1-fixed' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

Pull kunit updates from Shuah Khan:

 - fix user-after-free (UAF) bug in kunit_init_suite()

 - add option to kunit tool to print just the summary of test results

 - add option to kunit tool to print just the failed test results

 - fix kunit_zalloc_skb() to use user passed in gfp value instead of
   hardcoding GFP_KERNEL

 - fixe kunit_zalloc_skb() kernel doc to include allocation flags
   variable

 - update KUnit email address for Brendan Higgins

 - add LoongArch config to qemu_configs

 - allow overriding the shutdown mode from qemu config

 - enable shutdown in loongarch qemu_config

 - fix potential null dereference in kunit_device_driver_test()

 - fix debugfs to use IS_ERR() for alloc_string_stream() error check

* tag 'linux_kselftest-kunit-6.13-rc1-fixed' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest:
  kunit: qemu_configs: loongarch: Enable shutdown
  kunit: tool: Allow overriding the shutdown mode from qemu config
  kunit: qemu_configs: Add LoongArch config
  kunit: debugfs: Use IS_ERR() for alloc_string_stream() error check
  kunit: Fix potential null dereference in kunit_device_driver_test()
  MAINTAINERS: Update KUnit email address for Brendan Higgins
  kunit: string-stream: Fix a UAF bug in kunit_init_suite()
  kunit: tool: print failed tests only
  kunit: tool: Only print the summary
  kunit: skb: add gfp to kernel doc for kunit_zalloc_skb()
  kunit: skb: use "gfp" variable instead of hardcoding GFP_KERNEL

Author: torvalds

MAINTAINERS

@@ -12473,7 +12473,7 @@ F:	fs/smb/common/
 F:	fs/smb/server/
 
 KERNEL UNIT TESTING FRAMEWORK (KUnit)
-M:	Brendan Higgins <brendanhiggins@google.com>
+M:	Brendan Higgins <brendan.higgins@linux.dev>
 M:	David Gow <davidgow@google.com>
 R:	Rae Moar <rmoar@google.com>
 L:	linux-kselftest@vger.kernel.org

include/kunit/skbuff.h

@@ -20,16 +20,17 @@ static void kunit_action_kfree_skb(void *p)
  * kunit_zalloc_skb() - Allocate and initialize a resource managed skb.
  * @test: The test case to which the skb belongs
  * @len: size to allocate
+ * @gfp: allocation flags
  *
- * Allocate a new struct sk_buff with GFP_KERNEL, zero fill the give length
+ * Allocate a new struct sk_buff with gfp flags, zero fill the given length
  * and add it as a resource to the kunit test for automatic cleanup.
  *
  * Returns: newly allocated SKB, or %NULL on error
  */
 static inline struct sk_buff *kunit_zalloc_skb(struct kunit *test, int len,
 					       gfp_t gfp)
 {
-	struct sk_buff *res = alloc_skb(len, GFP_KERNEL);
+	struct sk_buff *res = alloc_skb(len, gfp);
 
 	if (!res || skb_pad(res, len))
 		return NULL;

lib/kunit/debugfs.c

@@ -181,15 +181,15 @@ void kunit_debugfs_create_suite(struct kunit_suite *suite)
 	 * successfully.
 	 */
 	stream = alloc_string_stream(GFP_KERNEL);
-	if (IS_ERR_OR_NULL(stream))
+	if (IS_ERR(stream))
 		return;
 
 	string_stream_set_append_newlines(stream, true);
 	suite->log = stream;
 
 	kunit_suite_for_each_test_case(suite, test_case) {
 		stream = alloc_string_stream(GFP_KERNEL);
-		if (IS_ERR_OR_NULL(stream))
+		if (IS_ERR(stream))
 			goto err;
 
 		string_stream_set_append_newlines(stream, true);
@@ -212,8 +212,11 @@ void kunit_debugfs_create_suite(struct kunit_suite *suite)
 
 err:
 	string_stream_destroy(suite->log);
-	kunit_suite_for_each_test_case(suite, test_case)
+	suite->log = NULL;
+	kunit_suite_for_each_test_case(suite, test_case) {
 		string_stream_destroy(test_case->log);
+		test_case->log = NULL;
+	}
 }
 
 void kunit_debugfs_destroy_suite(struct kunit_suite *suite)

lib/kunit/kunit-test.c

@@ -805,6 +805,8 @@ static void kunit_device_driver_test(struct kunit *test)
 	struct device *test_device;
 	struct driver_test_state *test_state = kunit_kzalloc(test, sizeof(*test_state), GFP_KERNEL);
 
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, test_state);
+
 	test->priv = test_state;
 	test_driver = kunit_driver_create(test, "my_driver");
 

tools/testing/kunit/kunit.py

@@ -23,7 +23,7 @@
 import kunit_json
 import kunit_kernel
 import kunit_parser
-from kunit_printer import stdout
+from kunit_printer import stdout, null_printer
 
 class KunitStatus(Enum):
 	SUCCESS = auto()
@@ -49,6 +49,8 @@ class KunitBuildRequest(KunitConfigRequest):
 class KunitParseRequest:
 	raw_output: Optional[str]
 	json: Optional[str]
+	summary: bool
+	failed: bool
 
 @dataclass
 class KunitExecRequest(KunitParseRequest):
@@ -235,11 +237,18 @@ def parse_tests(request: KunitParseRequest, metadata: kunit_json.Metadata, input
 		parse_time = time.time() - parse_start
 		return KunitResult(KunitStatus.SUCCESS, parse_time), fake_test
 
+	default_printer = stdout
+	if request.summary or request.failed:
+		default_printer = null_printer
 
 	# Actually parse the test results.
-	test = kunit_parser.parse_run_tests(input_data)
+	test = kunit_parser.parse_run_tests(input_data, default_printer)
 	parse_time = time.time() - parse_start
 
+	if request.failed:
+		kunit_parser.print_test(test, request.failed, stdout)
+	kunit_parser.print_summary_line(test, stdout)
+
 	if request.json:
 		json_str = kunit_json.get_json_result(
 					test=test,
@@ -413,6 +422,14 @@ def add_parse_opts(parser: argparse.ArgumentParser) -> None:
 			    help='Prints parsed test results as JSON to stdout or a file if '
 			    'a filename is specified. Does nothing if --raw_output is set.',
 			    type=str, const='stdout', default=None, metavar='FILE')
+	parser.add_argument('--summary',
+			    help='Prints only the summary line for parsed test results.'
+				'Does nothing if --raw_output is set.',
+			    action='store_true')
+	parser.add_argument('--failed',
+			    help='Prints only the failed parsed test results and summary line.'
+				'Does nothing if --raw_output is set.',
+			    action='store_true')
 
 
 def tree_from_args(cli_args: argparse.Namespace) -> kunit_kernel.LinuxSourceTree:
@@ -448,6 +465,8 @@ def run_handler(cli_args: argparse.Namespace) -> None:
 					jobs=cli_args.jobs,
 					raw_output=cli_args.raw_output,
 					json=cli_args.json,
+					summary=cli_args.summary,
+					failed=cli_args.failed,
 					timeout=cli_args.timeout,
 					filter_glob=cli_args.filter_glob,
 					filter=cli_args.filter,
@@ -495,6 +514,8 @@ def exec_handler(cli_args: argparse.Namespace) -> None:
 	exec_request = KunitExecRequest(raw_output=cli_args.raw_output,
 					build_dir=cli_args.build_dir,
 					json=cli_args.json,
+					summary=cli_args.summary,
+					failed=cli_args.failed,
 					timeout=cli_args.timeout,
 					filter_glob=cli_args.filter_glob,
 					filter=cli_args.filter,
@@ -520,7 +541,8 @@ def parse_handler(cli_args: argparse.Namespace) -> None:
 	# We know nothing about how the result was created!
 	metadata = kunit_json.Metadata()
 	request = KunitParseRequest(raw_output=cli_args.raw_output,
-					json=cli_args.json)
+					json=cli_args.json, summary=cli_args.summary,
+					failed=cli_args.failed)
 	result, _ = parse_tests(request, metadata, kunit_output)
 	if result.status != KunitStatus.SUCCESS:
 		sys.exit(1)

tools/testing/kunit/kunit_kernel.py

@@ -105,7 +105,9 @@ def __init__(self, qemu_arch_params: qemu_config.QemuArchParams, cross_compile:
 		self._kconfig = qemu_arch_params.kconfig
 		self._qemu_arch = qemu_arch_params.qemu_arch
 		self._kernel_path = qemu_arch_params.kernel_path
-		self._kernel_command_line = qemu_arch_params.kernel_command_line + ' kunit_shutdown=reboot'
+		self._kernel_command_line = qemu_arch_params.kernel_command_line
+		if 'kunit_shutdown=' not in self._kernel_command_line:
+			self._kernel_command_line += ' kunit_shutdown=reboot'
 		self._extra_qemu_params = qemu_arch_params.extra_qemu_params
 		self._serial = qemu_arch_params.serial