linux-hardening - [PATCH v4 1/7] kunit: Handle thread creation error

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Date: Tue, 26 Mar 2024 10:51:12 +0100
From: Mickaël Salaün <mic@...ikod.net>
To: Brendan Higgins <brendanhiggins@...gle.com>,
	David Gow <davidgow@...gle.com>,
	Rae Moar <rmoar@...gle.com>,
	Shuah Khan <skhan@...uxfoundation.org>
Cc: Mickaël Salaün <mic@...ikod.net>,
	Alan Maguire <alan.maguire@...cle.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"Eric W . Biederman" <ebiederm@...ssion.com>,
	"H . Peter Anvin" <hpa@...or.com>,
	Ingo Molnar <mingo@...hat.com>,
	James Morris <jamorris@...ux.microsoft.com>,
	Kees Cook <keescook@...omium.org>,
	Luis Chamberlain <mcgrof@...nel.org>,
	"Madhavan T . Venkataraman" <madvenka@...ux.microsoft.com>,
	Marco Pagani <marpagan@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Sean Christopherson <seanjc@...gle.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Thara Gopinath <tgopinath@...rosoft.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Vitaly Kuznetsov <vkuznets@...hat.com>,
	Zahra Tarkhani <ztarkhani@...rosoft.com>,
	kvm@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	linux-hyperv@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-um@...ts.infradead.org,
	x86@...nel.org
Subject: [PATCH v4 1/7] kunit: Handle thread creation error

Previously, if a thread creation failed (e.g. -ENOMEM), the function was
called (kunit_catch_run_case or kunit_catch_run_case_cleanup) without
marking the test as failed.  Instead, fill try_result with the error
code returned by kthread_run(), which will mark the test as failed and
print "internal error occurred...".

Cc: Brendan Higgins <brendanhiggins@...gle.com>
Cc: Shuah Khan <skhan@...uxfoundation.org>
Reviewed-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Rae Moar <rmoar@...gle.com>
Reviewed-by: David Gow <davidgow@...gle.com>
Signed-off-by: Mickaël Salaün <mic@...ikod.net>
Link: https://lore.kernel.org/r/20240326095118.126696-2-mic@digikod.net
---

Changes since v2:
* Add Rae's and David's Reviewed-by.

Changes since v1:
* Add Kees's Reviewed-by.
---
 lib/kunit/try-catch.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/kunit/try-catch.c b/lib/kunit/try-catch.c
index f7825991d576..a5cb2ef70a25 100644
--- a/lib/kunit/try-catch.c
+++ b/lib/kunit/try-catch.c
@@ -69,6 +69,7 @@ void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context)
 				  try_catch,
 				  "kunit_try_catch_thread");
 	if (IS_ERR(task_struct)) {
+		try_catch->try_result = PTR_ERR(task_struct);
 		try_catch->catch(try_catch->context);
 		return;
 	}
-- 
2.44.0