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3a35c13007
Previously, when a kernel test thread crashed (e.g. NULL pointer dereference, general protection fault), the KUnit test hanged for 30 seconds and exited with a timeout error. Fix this issue by waiting on task_struct->vfork_done instead of the custom kunit_try_catch.try_completion, and track the execution state by initially setting try_result with -EINTR and only setting it to 0 if the test passed. Fix kunit_generic_run_threadfn_adapter() signature by returning 0 instead of calling kthread_complete_and_exit(). Because thread's exit code is never checked, always set it to 0 to make it clear. To make this explicit, export kthread_exit() for KUnit tests built as module. Fix the -EINTR error message, which couldn't be reached until now. This is tested with a following patch. Cc: Brendan Higgins <brendanhiggins@google.com> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: Shuah Khan <skhan@linuxfoundation.org> Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: David Gow <davidgow@google.com> Tested-by: Rae Moar <rmoar@google.com> Signed-off-by: Mickaël Salaün <mic@digikod.net> Link: https://lore.kernel.org/r/20240408074625.65017-5-mic@digikod.net Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
63 lines
2.2 KiB
C
63 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* An API to allow a function, that may fail, to be executed, and recover in a
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* controlled manner.
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*
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* Copyright (C) 2019, Google LLC.
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* Author: Brendan Higgins <brendanhiggins@google.com>
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*/
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#ifndef _KUNIT_TRY_CATCH_H
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#define _KUNIT_TRY_CATCH_H
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#include <linux/types.h>
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typedef void (*kunit_try_catch_func_t)(void *);
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struct kunit;
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/**
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* struct kunit_try_catch - provides a generic way to run code which might fail.
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* @test: The test case that is currently being executed.
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* @try_result: Contains any errno obtained while running test case.
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* @try: The function, the test case, to attempt to run.
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* @catch: The function called if @try bails out.
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* @context: used to pass user data to the try and catch functions.
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*
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* kunit_try_catch provides a generic, architecture independent way to execute
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* an arbitrary function of type kunit_try_catch_func_t which may bail out by
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* calling kunit_try_catch_throw(). If kunit_try_catch_throw() is called, @try
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* is stopped at the site of invocation and @catch is called.
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*
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* struct kunit_try_catch provides a generic interface for the functionality
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* needed to implement kunit->abort() which in turn is needed for implementing
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* assertions. Assertions allow stating a precondition for a test simplifying
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* how test cases are written and presented.
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*
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* Assertions are like expectations, except they abort (call
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* kunit_try_catch_throw()) when the specified condition is not met. This is
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* useful when you look at a test case as a logical statement about some piece
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* of code, where assertions are the premises for the test case, and the
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* conclusion is a set of predicates, rather expectations, that must all be
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* true. If your premises are violated, it does not makes sense to continue.
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*/
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struct kunit_try_catch {
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/* private: internal use only. */
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struct kunit *test;
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int try_result;
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kunit_try_catch_func_t try;
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kunit_try_catch_func_t catch;
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void *context;
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};
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void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context);
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void __noreturn kunit_try_catch_throw(struct kunit_try_catch *try_catch);
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static inline int kunit_try_catch_get_result(struct kunit_try_catch *try_catch)
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{
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return try_catch->try_result;
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}
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#endif /* _KUNIT_TRY_CATCH_H */
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