Commit Graph

84 Commits

Author SHA1 Message Date
Joe Fradley
d20a6ba5e3 kunit: add kunit.enable to enable/disable KUnit test
This patch adds the kunit.enable module parameter that will need to be
set to true in addition to KUNIT being enabled for KUnit tests to run.
The default value is true giving backwards compatibility. However, for
the production+testing use case the new config option
KUNIT_DEFAULT_ENABLED can be set to N requiring the tester to opt-in
by passing kunit.enable=1 to the kernel.

Signed-off-by: Joe Fradley <joefradley@google.com>
Reviewed-by: David Gow <davidgow@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2022-09-30 13:17:39 -06:00
David Gow
94681e289b kunit: executor: Fix a memory leak on failure in kunit_filter_tests
It's possible that memory allocation for 'filtered' will fail, but for the
copy of the suite to succeed. In this case, the copy could be leaked.

Properly free 'copy' in the error case for the allocation of 'filtered'
failing.

Note that there may also have been a similar issue in
kunit_filter_subsuites, before it was removed in "kunit: flatten
kunit_suite*** to kunit_suite** in .kunit_test_suites".

This was reported by clang-analyzer via the kernel test robot, here:
https://lore.kernel.org/all/c8073b8e-7b9e-0830-4177-87c12f16349c@intel.com/

And by smatch via Dan Carpenter and the kernel test robot:
https://lore.kernel.org/all/202207101328.ASjx88yj-lkp@intel.com/

Fixes: a02353f491 ("kunit: bail out of test filtering logic quicker if OOM")
Reported-by: kernel test robot <yujie.liu@intel.com>
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: David Gow <davidgow@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2022-07-14 10:35:56 -06:00
Daniel Latypov
e5857d396f kunit: flatten kunit_suite*** to kunit_suite** in .kunit_test_suites
We currently store kunit suites in the .kunit_test_suites ELF section as
a `struct kunit_suite***` (modulo some `const`s).
For every test file, we store a struct kunit_suite** NULL-terminated array.

This adds quite a bit of complexity to the test filtering code in the
executor.

Instead, let's just make the .kunit_test_suites section contain a single
giant array of struct kunit_suite pointers, which can then be directly
manipulated. This array is not NULL-terminated, and so none of the test
filtering code needs to NULL-terminate anything.

Tested-by: Maíra Canal <maira.canal@usp.br>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Daniel Latypov <dlatypov@google.com>
Co-developed-by: David Gow <davidgow@google.com>
Signed-off-by: David Gow <davidgow@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2022-07-11 17:13:15 -06:00
Jeremy Kerr
3d6e446238 kunit: unify module and builtin suite definitions
Currently, KUnit runs built-in tests and tests loaded from modules
differently. For built-in tests, the kunit_test_suite{,s}() macro adds a
list of suites in the .kunit_test_suites linker section. However, for
kernel modules, a module_init() function is used to run the test suites.

This causes problems if tests are included in a module which already
defines module_init/exit_module functions, as they'll conflict with the
kunit-provided ones.

This change removes the kunit-defined module inits, and instead parses
the kunit tests from their own section in the module. After module init,
we call __kunit_test_suites_init() on the contents of that section,
which prepares and runs the suite.

This essentially unifies the module- and non-module kunit init formats.

Tested-by: Maíra Canal <maira.canal@usp.br>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>
Signed-off-by: Daniel Latypov <dlatypov@google.com>
Signed-off-by: David Gow <davidgow@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2022-07-11 17:13:09 -06:00
Daniel Latypov
d2fbdde838 kunit: use kmemdup in kunit_filter_tests(), take suite as const
kmemdup() is easier than kmalloc() + memcpy(), per lkp bot.

Also make the input `suite` as const since we're now always making
copies after commit a127b154a8 ("kunit: tool: allow filtering test
cases via glob").

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: David Gow <davidgow@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2022-07-07 17:42:53 -06:00
David Gow
c272612cb4 kunit: Taint the kernel when KUnit tests are run
Make KUnit trigger the new TAINT_TEST taint when any KUnit test is run.
Due to KUnit tests not being intended to run on production systems, and
potentially causing problems (or security issues like leaking kernel
addresses), the kernel's state should not be considered safe for
production use after KUnit tests are run.

This both marks KUnit modules as test modules using MODULE_INFO() and
manually taints the kernel when tests are run (which catches builtin
tests).

Acked-by: Luis Chamberlain <mcgrof@kernel.org>
Tested-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: David Gow <davidgow@google.com>
Tested-by: Maíra Canal <mairacanal@riseup.net>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2022-07-01 16:38:43 -06:00
Daniel Latypov
1b11063d32 kunit: fix executor OOM error handling logic on non-UML
The existing logic happens to work fine on UML, but is not correct when
running on other arches.

1. We didn't initialize `int err`, and kunit_filter_suites() doesn't
   explicitly set it to 0 on success. So we had false "failures".
   Note: it doesn't happen on UML, causing this to get overlooked.
2. If we error out, we do not call kunit_handle_shutdown().
   This makes kunit.py timeout when using a non-UML arch, since the QEMU
   process doesn't ever exit.

Fixes: a02353f491 ("kunit: bail out of test filtering logic quicker if OOM")
Signed-off-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2022-05-17 10:01:40 -06:00
Miguel Ojeda
7466886b40 kunit: take kunit_assert as const
The `kunit_do_failed_assertion` function passes its
`struct kunit_assert` argument to `kunit_fail`. This one,
in turn, calls its `format` field passing the assert again
as a `const` pointer.

Therefore, the whole chain may be made `const`.

Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Reviewed-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2022-05-16 13:23:00 -06:00
Daniel Latypov
a02353f491 kunit: bail out of test filtering logic quicker if OOM
When filtering what tests to run (suites and/or cases) via
kunit.filter_glob (e.g. kunit.py run <glob>), we allocate copies of
suites.

These allocations can fail, and we largely don't handle that.
Note: realistically, this probably doesn't matter much.
We're not allocating much memory and this happens early in boot, so if
we can't do that, then there's likely far bigger problems.

This patch makes us immediately bail out from the top-level function
(kunit_filter_suites) with -ENOMEM if any of the underlying kmalloc()
calls return NULL.

Implementation note: we used to return NULL pointers from some functions
to indicate either that all suites/tests were filtered out or there was
an error allocating the new array.

We'll log a short error in this case and not run any tests or print a
TAP header. From a kunit.py user's perspective, they'll get a message
about missing/invalid TAP output and have to dig into the test.log to
see it. Since hitting this error seems so unlikely, it's probably fine
to not invent a way to plumb this error message more visibly.

See also: https://lore.kernel.org/linux-kselftest/20220329103919.2376818-1-lv.ruyi@zte.com.cn/

Signed-off-by: Daniel Latypov <dlatypov@google.com>
Reported-by: Zeal Robot <zealci@zte.com.cn>
Reported-by: Lv Ruyi <lv.ruyi@zte.com.cn>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2022-05-12 11:15:08 -06:00
David Gow
ad69172ec9 kunit: Rework kunit_resource allocation policy
KUnit's test-managed resources can be created in two ways:
- Using the kunit_add_resource() family of functions, which accept a
  struct kunit_resource pointer, typically allocated statically or on
  the stack during the test.
- Using the kunit_alloc_resource() family of functions, which allocate a
  struct kunit_resource using kzalloc() behind the scenes.

Both of these families of functions accept a 'free' function to be
called when the resource is finally disposed of.

At present, KUnit will kfree() the resource if this 'free' function is
specified, and will not if it is NULL. However, this can lead
kunit_alloc_resource() to leak memory (if no 'free' function is passed
in), or kunit_add_resource() to incorrectly kfree() memory which was
allocated by some other means (on the stack, as part of a larger
allocation, etc), if a 'free' function is provided.

Instead, always kfree() if the resource was allocated with
kunit_alloc_resource(), and never kfree() if it was passed into
kunit_add_resource() by the user. (If the user of kunit_add_resource()
wishes the resource be kfree()ed, they can call kfree() on the resource
from within the 'free' function.

This is implemented by adding a 'should_free' member to
struct kunit_resource and setting it appropriately. To facilitate this,
the various resource add/alloc functions have been refactored somewhat,
making them all call a __kunit_add_resource() helper after setting the
'should_free' member appropriately. In the process, all other functions
have been made static inline functions.

Signed-off-by: David Gow <davidgow@google.com>
Tested-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2022-05-12 11:14:39 -06:00
Daniel Latypov
38289a26e1 kunit: fix debugfs code to use enum kunit_status, not bool
Commit 6d2426b2f2 ("kunit: Support skipped tests") switched to using
`enum kunit_status` to track the result of running a test/suite since we
now have more than just pass/fail.

This callsite wasn't updated, silently converting to enum to a bool and
then back.

Fixes: 6d2426b2f2 ("kunit: Support skipped tests")
Signed-off-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2022-05-02 12:36:03 -06:00
Daniel Latypov
1cdba21db2 kunit: add ability to specify suite-level init and exit functions
KUnit has support for setup/cleanup logic for each test case in a suite.
But it lacks the ability to specify setup/cleanup for the entire suite
itself.

This can be used to do setup that is too expensive or cumbersome to do
for each test.
Or it can be used to do simpler things like log debug information after
the suite completes.
It's a fairly common feature, so the lack of it is noticeable.

Some examples in other frameworks and languages:
* https://docs.python.org/3/library/unittest.html#setupclass-and-teardownclass
* https://google.github.io/googletest/reference/testing.html#Test::SetUpTestSuite

Meta:
This is very similar to this patch here: https://lore.kernel.org/linux-kselftest/20210805043503.20252-3-bvanassche@acm.org/
The changes from that patch:
* pass in `struct kunit *` so users can do stuff like
  `kunit_info(suite, "debug message")`
* makes sure the init failure is bubbled up as a failure
* updates kunit-example-test.c to use a suite init
* Updates kunit/usage.rst to mention the new support
* some minor cosmetic things
  * use `suite_{init,exit}` instead of `{init/exit}_suite`
  * make suite init error message more consistent w/ test init
  * etc.

Signed-off-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: David Gow <davidgow@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2022-05-02 12:35:51 -06:00
Daniel Latypov
cae56e1740 kunit: rename print_subtest_{start,end} for clarity (s/subtest/suite)
These names sound more general than they are.

The _end() function increments a `static int kunit_suite_counter`, so it
can only safely be called on suites, aka top-level subtests.
It would need to have a separate counter for each level of subtest to be
generic enough.

So rename it to make it clear it's only appropriate for suites.

Signed-off-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: David Gow <davidgow@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2022-05-02 12:35:39 -06:00
David Gow
59729170af kunit: Make kunit_remove_resource() idempotent
The kunit_remove_resource() function is used to unlink a resource from
the list of resources in the test, making it no longer show up in
kunit_find_resource().

However, this could lead to a race condition if two threads called
kunit_remove_resource() on the same resource at the same time: the
resource would be removed from the list twice (causing a crash at the
second list_del()), and the refcount for the resource would be
decremented twice (instead of once, for the reference held by the
resource list).

Fix both problems, the first by using list_del_init(), and the second by
checking if the resource has already been removed using list_empty(),
and only decrementing its refcount if it has not.

Also add a KUnit test for the kunit_remove_resource() function which
tests this behaviour.

Reported-by: Daniel Latypov <dlatypov@google.com>
Signed-off-by: David Gow <davidgow@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2022-04-05 13:32:50 -06:00
Daniel Latypov
cdebea6968 kunit: split resource API impl from test.c into new resource.c
We've split out the declarations from include/kunit/test.h into
resource.h.
This patch splits out the definitions as well for consistency.

A side effect of this is git blame won't properly track history by
default, users need to run
$ git blame -L ,1 -C13 lib/kunit/resource.c

Signed-off-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: David Gow <davidgow@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2022-04-04 16:23:14 -06:00
Ricardo Ribalda
de82c15dc0 kunit: use NULL macros
Replace the NULL checks with the more specific and idiomatic NULL macros.

Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Reviewed-by: Daniel Latypov <dlatypov@google.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2022-04-04 14:29:08 -06:00
Linus Torvalds
d51b1b33c5 linux-kselftest-kunit-5.18-rc1
This KUnit update for Linux 5.18-rc1 consists of:
 
 - changes to decrease macro layering string, integer, EQ/NE asserts
 - remove unused macros
 - several cleanups and fixes
 - new list tests for list_del_init_careful(), list_is_head() and
   list_entry_is_head()
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Merge tag 'linux-kselftest-kunit-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

Pull KUnit updates from Shuah Khan:

 - changes to decrease macro layering string, integer, EQ/NE asserts

 - remove unused macros

 - several cleanups and fixes

 - new list tests for list_del_init_careful(), list_is_head() and
   list_entry_is_head()

* tag 'linux-kselftest-kunit-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest:
  list: test: Add a test for list_entry_is_head()
  list: test: Add a test for list_is_head()
  list: test: Add test for list_del_init_careful()
  kunit: cleanup assertion macro internal variables
  kunit: factor out str constants from binary assertion structs
  kunit: consolidate KUNIT_INIT_BINARY_ASSERT_STRUCT macros
  kunit: remove va_format from kunit_assert
  kunit: tool: drop mostly unused KunitResult.result field
  kunit: decrease macro layering for EQ/NE asserts
  kunit: decrease macro layering for integer asserts
  kunit: reduce layering in string assertion macros
  kunit: drop unused intermediate macros for ptr inequality checks
  kunit: make KUNIT_EXPECT_EQ() use KUNIT_EXPECT_EQ_MSG(), etc.
  kunit: drop unused assert_type from kunit_assert and clean up macros
  kunit: split out part of kunit_assert into a static const
  kunit: factor out kunit_base_assert_format() call into kunit_fail()
  kunit: drop unused kunit* field in kunit_assert
  kunit: move check if assertion passed into the macros
  kunit: add example test case showing off all the expect macros
2022-03-23 12:56:39 -07:00
Peng Liu
bdd015f7b7 kunit: make kunit_test_timeout compatible with comment
In function kunit_test_timeout, it is declared "300 * MSEC_PER_SEC"
represent 5min.  However, it is wrong when dealing with arm64 whose
default HZ = 250, or some other situations.  Use msecs_to_jiffies to fix
this, and kunit_test_timeout will work as desired.

Link: https://lkml.kernel.org/r/20220309083753.1561921-3-liupeng256@huawei.com
Fixes: 5f3e062089 ("kunit: test: add support for test abort")
Signed-off-by: Peng Liu <liupeng256@huawei.com>
Reviewed-by: Marco Elver <elver@google.com>
Reviewed-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Tested-by: Brendan Higgins <brendanhiggins@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Wang Kefeng <wangkefeng.wang@huawei.com>
Cc: David Gow <davidgow@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2022-03-22 15:57:11 -07:00
Peng Liu
adf5054570 kunit: fix UAF when run kfence test case test_gfpzero
Patch series "kunit: fix a UAF bug and do some optimization", v2.

This series is to fix UAF (use after free) when running kfence test case
test_gfpzero, which is time costly.  This UAF bug can be easily triggered
by setting CONFIG_KFENCE_NUM_OBJECTS = 65535.  Furthermore, some
optimization for kunit tests has been done.

This patch (of 3):

Kunit will create a new thread to run an actual test case, and the main
process will wait for the completion of the actual test thread until
overtime.  The variable "struct kunit test" has local property in function
kunit_try_catch_run, and will be used in the test case thread.  Task
kunit_try_catch_run will free "struct kunit test" when kunit runs
overtime, but the actual test case is still run and an UAF bug will be
triggered.

The above problem has been both observed in a physical machine and qemu
platform when running kfence kunit tests.  The problem can be triggered
when setting CONFIG_KFENCE_NUM_OBJECTS = 65535.  Under this setting, the
test case test_gfpzero will cost hours and kunit will run to overtime.
The follows show the panic log.

  BUG: unable to handle page fault for address: ffffffff82d882e9

  Call Trace:
   kunit_log_append+0x58/0xd0
   ...
   test_alloc.constprop.0.cold+0x6b/0x8a [kfence_test]
   test_gfpzero.cold+0x61/0x8ab [kfence_test]
   kunit_try_run_case+0x4c/0x70
   kunit_generic_run_threadfn_adapter+0x11/0x20
   kthread+0x166/0x190
   ret_from_fork+0x22/0x30
  Kernel panic - not syncing: Fatal exception
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
  Ubuntu-1.8.2-1ubuntu1 04/01/2014

To solve this problem, the test case thread should be stopped when the
kunit frame runs overtime.  The stop signal will send in function
kunit_try_catch_run, and test_gfpzero will handle it.

Link: https://lkml.kernel.org/r/20220309083753.1561921-1-liupeng256@huawei.com
Link: https://lkml.kernel.org/r/20220309083753.1561921-2-liupeng256@huawei.com
Signed-off-by: Peng Liu <liupeng256@huawei.com>
Reviewed-by: Marco Elver <elver@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Tested-by: Brendan Higgins <brendanhiggins@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Wang Kefeng <wangkefeng.wang@huawei.com>
Cc: Daniel Latypov <dlatypov@google.com>
Cc: David Gow <davidgow@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2022-03-22 15:57:11 -07:00
Daniel Latypov
2b6861e237 kunit: factor out str constants from binary assertion structs
If the compiler doesn't optimize them away, each kunit assertion (use of
KUNIT_EXPECT_EQ, etc.) can use 88 bytes of stack space in the worst and
most common case. This has led to compiler warnings and a suggestion
from Linus to move data from the structs into static const's where
possible [1].

This builds upon [2] which did so for the base struct kunit_assert type.
That only reduced sizeof(struct kunit_binary_assert) from 88 to 64.

Given these are by far the most commonly used asserts, this patch
factors out the textual representations of the operands and comparator
into another static const, saving 16 more bytes.

In detail, KUNIT_EXPECT_EQ(test, 2 + 2, 5) yields the following struct
  (struct kunit_binary_assert) {
    .assert = <struct kunit_assert>,
    .operation = "==",
    .left_text = "2 + 2",
    .left_value = 4,
    .right_text = "5",
    .right_value = 5,
  }
After this change
  static const struct kunit_binary_assert_text __text = {
    .operation = "==",
    .left_text = "2 + 2",
    .right_text = "5",
  };
  (struct kunit_binary_assert) {
    .assert = <struct kunit_assert>,
    .text = &__text,
    .left_value = 4,
    .right_value = 5,
  }

This also DRYs the code a bit more since these str fields were repeated
for the string and pointer versions of kunit_binary_assert.

Note: we could name the kunit_binary_assert_text fields left/right
instead of left_text/right_text. But that would require changing the
macros a bit since they have args called "left" and "right" which would
be substituted in `.left = #left` as `.2 + 2 = \"2 + 2\"`.

[1] https://groups.google.com/g/kunit-dev/c/i3fZXgvBrfA/m/VULQg1z6BAAJ
[2] https://lore.kernel.org/linux-kselftest/20220113165931.451305-6-dlatypov@google.com/

Signed-off-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: David Gow <davidgow@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2022-01-31 11:55:39 -07:00
Daniel Latypov
6419abb80e kunit: remove va_format from kunit_assert
The concern is that having a lot of redundant fields in kunit_assert can
blow up stack usage if the compiler doesn't optimize them away [1].

The comment on this field implies that it was meant to be initialized
when the expect/assert was declared, but this only happens when we run
kunit_do_failed_assertion().

We don't need to access it outside of that function, so move it out of
the struct and make it a local variable there.

This change also takes the chance to reduce the number of macros by
inlining the now simplified KUNIT_INIT_ASSERT_STRUCT() macro.

[1] https://groups.google.com/g/kunit-dev/c/i3fZXgvBrfA/m/VULQg1z6BAAJ

Signed-off-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: David Gow <davidgow@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2022-01-31 11:55:27 -07:00
Daniel Latypov
21957f90b2 kunit: split out part of kunit_assert into a static const
This is per Linus's suggestion in [1].

The issue there is that every KUNIT_EXPECT/KUNIT_ASSERT puts a
kunit_assert object onto the stack. Normally we rely on compilers to
elide this, but when that doesn't work out, this blows up the stack
usage of kunit test functions.

We can move some data off the stack by making it static.
This change introduces a new `struct kunit_loc` to hold the file and
line number and then just passing assert_type (EXPECT or ASSERT) as an
argument.

In [1], it was suggested to also move out the format string as well, but
users could theoretically craft a format string at runtime, so we can't.

This change leaves a copy of `assert_type` in kunit_assert for now
because cleaning up all the macros to not pass it around is a bit more
involved.

Here's an example of the expanded code for KUNIT_FAIL():
if (__builtin_expect(!!(!(false)), 0)) {
  static const struct kunit_loc loc = { .file = ... };
  struct kunit_fail_assert __assertion = { .assert = { .type ...  };
  kunit_do_failed_assertion(test, &loc, KUNIT_EXPECTATION, &__assertion.assert, ...);
};

[1] https://groups.google.com/g/kunit-dev/c/i3fZXgvBrfA/m/VULQg1z6BAAJ

Signed-off-by: Daniel Latypov <dlatypov@google.com>
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: David Gow <davidgow@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2022-01-25 12:49:59 -07:00
Daniel Latypov
dd640d7087 kunit: factor out kunit_base_assert_format() call into kunit_fail()
We call this function first thing for all the assertion `format()`
functions.
This is the part that prints the file and line number and assertion type
(EXPECTATION, ASSERTION).

Having it as part of the format functions lets us have the flexibility
to not print that information (or print it differently) for new
assertion types, but I think this we don't need that.

And in the future, we'd like to consider factoring that data (file,
line#, type) out of the kunit_assert struct and into a `static`
variable, as Linus suggested [1], so we'd need to extract it anyways.

[1] https://groups.google.com/g/kunit-dev/c/i3fZXgvBrfA/m/VULQg1z6BAAJ

Signed-off-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: David Gow <davidgow@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2022-01-25 12:49:53 -07:00
Daniel Latypov
4fdacef8ac kunit: move check if assertion passed into the macros
Currently the code always calls kunit_do_assertion() even though it does
nothing when `pass` is true.

This change moves the `if(!(pass))` check into the macro instead
and renames the function to kunit_do_failed_assertion().
I feel this a bit easier to read and understand.

This has the potential upside of avoiding a function call that does
nothing most of the time (assuming your tests are passing) but comes
with the downside of generating a bit more code and branches. We try to
mitigate the branches by tagging them with `unlikely()`.

This also means we don't have to initialize structs that we don't need,
which will become a tiny bit more expensive if we switch over to using
static variables to try and reduce stack usage. (There's runtime code
to check if the variable has been initialized yet or not).

Signed-off-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Reviewed-by: David Gow <davidgow@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2022-01-25 12:49:40 -07:00
Daniel Latypov
7b3391057f kunit: add example test case showing off all the expect macros
Currently, these macros are only really documented near the bottom of
https://www.kernel.org/doc/html/latest/dev-tools/kunit/api/test.html#c.KUNIT_FAIL.

E.g. it's likely someone might just not realize that
KUNIT_EXPECT_STREQ() exists and instead use KUNIT_EXPECT_FALSE(strcmp())
or similar.

This can also serve as a basic smoketest that the KUnit assert machinery
still works for all the macros.

Signed-off-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Reviewed-by: David Gow <davidgow@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2022-01-25 12:49:20 -07:00
Linus Torvalds
35ce8ae9ae Merge branch 'signal-for-v5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
Pull signal/exit/ptrace updates from Eric Biederman:
 "This set of changes deletes some dead code, makes a lot of cleanups
  which hopefully make the code easier to follow, and fixes bugs found
  along the way.

  The end-game which I have not yet reached yet is for fatal signals
  that generate coredumps to be short-circuit deliverable from
  complete_signal, for force_siginfo_to_task not to require changing
  userspace configured signal delivery state, and for the ptrace stops
  to always happen in locations where we can guarantee on all
  architectures that the all of the registers are saved and available on
  the stack.

  Removal of profile_task_ext, profile_munmap, and profile_handoff_task
  are the big successes for dead code removal this round.

  A bunch of small bug fixes are included, as most of the issues
  reported were small enough that they would not affect bisection so I
  simply added the fixes and did not fold the fixes into the changes
  they were fixing.

  There was a bug that broke coredumps piped to systemd-coredump. I
  dropped the change that caused that bug and replaced it entirely with
  something much more restrained. Unfortunately that required some
  rebasing.

  Some successes after this set of changes: There are few enough calls
  to do_exit to audit in a reasonable amount of time. The lifetime of
  struct kthread now matches the lifetime of struct task, and the
  pointer to struct kthread is no longer stored in set_child_tid. The
  flag SIGNAL_GROUP_COREDUMP is removed. The field group_exit_task is
  removed. Issues where task->exit_code was examined with
  signal->group_exit_code should been examined were fixed.

  There are several loosely related changes included because I am
  cleaning up and if I don't include them they will probably get lost.

  The original postings of these changes can be found at:
     https://lkml.kernel.org/r/87a6ha4zsd.fsf@email.froward.int.ebiederm.org
     https://lkml.kernel.org/r/87bl1kunjj.fsf@email.froward.int.ebiederm.org
     https://lkml.kernel.org/r/87r19opkx1.fsf_-_@email.froward.int.ebiederm.org

  I trimmed back the last set of changes to only the obviously correct
  once. Simply because there was less time for review than I had hoped"

* 'signal-for-v5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (44 commits)
  ptrace/m68k: Stop open coding ptrace_report_syscall
  ptrace: Remove unused regs argument from ptrace_report_syscall
  ptrace: Remove second setting of PT_SEIZED in ptrace_attach
  taskstats: Cleanup the use of task->exit_code
  exit: Use the correct exit_code in /proc/<pid>/stat
  exit: Fix the exit_code for wait_task_zombie
  exit: Coredumps reach do_group_exit
  exit: Remove profile_handoff_task
  exit: Remove profile_task_exit & profile_munmap
  signal: clean up kernel-doc comments
  signal: Remove the helper signal_group_exit
  signal: Rename group_exit_task group_exec_task
  coredump: Stop setting signal->group_exit_task
  signal: Remove SIGNAL_GROUP_COREDUMP
  signal: During coredumps set SIGNAL_GROUP_EXIT in zap_process
  signal: Make coredump handling explicit in complete_signal
  signal: Have prepare_signal detect coredumps using signal->core_state
  signal: Have the oom killer detect coredumps using signal->core_state
  exit: Move force_uaccess back into do_exit
  exit: Guarantee make_task_dead leaks the tsk when calling do_task_exit
  ...
2022-01-17 05:49:30 +02:00
David Gow
44b7da5fcd kunit: Report test parameter results as (K)TAP subtests
Currently, the results for individial parameters in a parameterised test
are simply output as (K)TAP diagnostic lines.

As kunit_tool now supports nested subtests, report each parameter as its
own subtest.

For example, here's what the output now looks like:
	# Subtest: inode_test_xtimestamp_decoding
	ok 1 - 1901-12-13 Lower bound of 32bit < 0 timestamp, no extra bits
	ok 2 - 1969-12-31 Upper bound of 32bit < 0 timestamp, no extra bits
	ok 3 - 1970-01-01 Lower bound of 32bit >=0 timestamp, no extra bits
	ok 4 - 2038-01-19 Upper bound of 32bit >=0 timestamp, no extra bits
	ok 5 - 2038-01-19 Lower bound of 32bit <0 timestamp, lo extra sec bit on
	ok 6 - 2106-02-07 Upper bound of 32bit <0 timestamp, lo extra sec bit on
	ok 7 - 2106-02-07 Lower bound of 32bit >=0 timestamp, lo extra sec bit on
	ok 8 - 2174-02-25 Upper bound of 32bit >=0 timestamp, lo extra sec bit on
	ok 9 - 2174-02-25 Lower bound of 32bit <0 timestamp, hi extra sec bit on
	ok 10 - 2242-03-16 Upper bound of 32bit <0 timestamp, hi extra sec bit on
	ok 11 - 2242-03-16 Lower bound of 32bit >=0 timestamp, hi extra sec bit on
	ok 12 - 2310-04-04 Upper bound of 32bit >=0 timestamp, hi extra sec bit on
	ok 13 - 2310-04-04 Upper bound of 32bit>=0 timestamp, hi extra sec bit 1. 1 ns
	ok 14 - 2378-04-22 Lower bound of 32bit>= timestamp. Extra sec bits 1. Max ns
	ok 15 - 2378-04-22 Lower bound of 32bit >=0 timestamp. All extra sec bits on
	ok 16 - 2446-05-10 Upper bound of 32bit >=0 timestamp. All extra sec bits on
	# inode_test_xtimestamp_decoding: pass:16 fail:0 skip:0 total:16
	ok 1 - inode_test_xtimestamp_decoding

Signed-off-by: David Gow <davidgow@google.com>
Reviewed-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2021-12-13 13:36:29 -07:00
David Gow
37dbb4c7c7 kunit: Don't crash if no parameters are generated
It's possible that a parameterised test could end up with zero
parameters. At the moment, the test function will nevertheless be called
with NULL as the parameter. Instead, don't try to run the test code, and
just mark the test as SKIPped.

Reported-by: Daniel Latypov <dlatypov@google.com>
Signed-off-by: David Gow <davidgow@google.com>
Reviewed-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2021-12-13 13:36:21 -07:00
Eric W. Biederman
cead185526 exit: Rename complete_and_exit to kthread_complete_and_exit
Update complete_and_exit to call kthread_exit instead of do_exit.

Change the name to reflect this change in functionality.  All of the
users of complete_and_exit are causing the current kthread to exit so
this change makes it clear what is happening.

Move the implementation of kthread_complete_and_exit from
kernel/exit.c to to kernel/kthread.c.  As this function is kthread
specific it makes most sense to live with the kthread functions.

There are no functional change.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2021-12-13 12:04:45 -06:00
David Gow
17ac23eb43 kunit: Reset suite count after running tests
There are some KUnit tests (KFENCE, Thunderbolt) which, for various
reasons, do not use the kunit_test_suite() macro and end up running
before the KUnit executor runs its tests. This means that their results
are printed separately, and they aren't included in the suite count used
by the executor.

This causes the executor output to be invalid TAP, however, as the suite
numbers used are no-longer 1-based, and don't match the test plan.
kunit_tool, therefore, prints a large number of warnings.

While it'd be nice to fix the tests to run in the executor, in the
meantime, reset the suite counter to 1 in __kunit_test_suites_exit.
Not only does this fix the executor, it means that if there are multiple
calls to __kunit_test_suites_init() across different tests, they'll each
get their own numbering.

kunit_tool likes this better: even if it's lacking the results for those
tests which don't use the executor (due to the lack of TAP header), the
output for the other tests is valid.

Signed-off-by: David Gow <davidgow@google.com>
Reviewed-by: Daniel Latypov <dlatypov@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2021-10-19 14:22:02 -06:00
Daniel Latypov
9c6b0e1d89 kunit: add 'kunit.action' param to allow listing out tests
Context:
It's difficult to map a given .kunitconfig => set of enabled tests.
Letting kunit.py figure that out would be useful.

This patch:
* is intended to be an implementation detail used only by kunit.py
* adds a kunit.action module param with one valid non-null value, "list"
* for the "list" action, it simply prints out "<suite>.<test>"
* leaves the kunit.py changes to make use of this for another patch.

Note: kunit.filter_glob is respected for this and all future actions.

Hack: we print a TAP header (but no test plan) to allow kunit.py to
use the same code to pick up KUnit output that it does for normal tests.
Since this is intended to be an implementation detail, it seems fine for
now. Maybe in the future we output each test as SKIPPED or the like.

Go with a more generic "action" param, since it seems like we might
eventually have more modes besides just running or listing tests, e.g.
* perhaps a benchmark mode that reruns test cases and reports timing
* perhaps a deflake mode that reruns test cases that failed
* perhaps a mode where we randomize test order to try and catch
  hermeticity bugs like "test a only passes if run after test b"

Tested:
$ ./tools/testing/kunit/kunit.py run --kernel_arg=kunit.action=list --raw_output=kunit
...
TAP version 14
1..1
example.example_simple_test
example.example_skip_test
example.example_mark_skipped_test
reboot: System halted

Signed-off-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: David Gow <davidgow@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2021-10-19 14:18:50 -06:00
Daniel Latypov
cd94fbc2ca kunit: fix too small allocation when using suite-only kunit.filter_glob
When a user filters by a suite and not a test, e.g.
$ ./tools/testing/kunit/kunit.py run 'suite_name'

it hits this code
  const int len = strlen(filter_glob);
  ...
  parsed->suite_glob = kmalloc(len, GFP_KERNEL);
which fails to allocate space for the terminating NULL.

Somehow, it seems like we can't easily reproduce this under UML, so the
existing `parse_filter_test()` didn't catch this.

Fix this by allocating `len + 1` and switch to kzalloc() just to be a
bit more defensive. We're only going to run this code once per kernel
boot, and it should never be very long.

Also update the unit tests to be a bit more cautious.
This bug showed up as a NULL pointer dereference here:
>  KUNIT_EXPECT_STREQ(test, (const char *)filtered.start[0][0]->name, "suite0");
`filtered.start[0][0]` was NULL, and `name` is at offset 0 in the struct,
so `...->name` was also NULL.

Fixes: 3b29021ddd10 ("kunit: tool: allow filtering test cases via glob")
Reported-by: kernel test robot <oliver.sang@intel.com>
Signed-off-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: David Gow <davidgow@google.com>
Acked-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2021-10-19 14:18:49 -06:00
Daniel Latypov
a127b154a8 kunit: tool: allow filtering test cases via glob
Commit 1d71307a6f ("kunit: add unit test for filtering suites by
names") introduced the ability to filter which suites we run via glob.

This change extends it so we can also filter individual test cases
inside of suites as well.

This is quite useful when, e.g.
* trying to run just the tests cases you've just added or are working on
* trying to debug issues with test hermeticity

Examples:
$ ./tools/testing/kunit/kunit.py run --kunitconfig=lib/kunit '*exec*.parse*'
...
============================================================
======== [PASSED] kunit_executor_test ========
[PASSED] parse_filter_test
============================================================
Testing complete. 1 tests run. 0 failed. 0 crashed.

$ ./tools/testing/kunit/kunit.py run --kunitconfig=lib/kunit '*.no_matching_tests'
...
[ERROR] no tests run!

Signed-off-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: David Gow <davidgow@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2021-10-19 14:18:49 -06:00
Daniel Latypov
b7cbaef303 kunit: drop assumption in kunit-log-test about current suite
This test assumes that the declared kunit_suite object is the exact one
which is being executed, which KUnit will not guarantee [1].

Specifically, `suite->log` is not initialized until a suite object is
executed. So if KUnit makes a copy of the suite and runs that instead,
this test dereferences an invalid pointer and (hopefully) segfaults.

N.B. since we no longer assume this, we can no longer verify that
`suite->log` is *not* allocated during normal execution.

An alternative to this patch that would allow us to test that would
require exposing an API for the current test to get its current suite.
Exposing that for one internal kunit test seems like overkill, and
grants users more footguns (e.g. reusing a test case in multiple suites
and changing behavior based on the suite name, dynamically modifying the
setup/cleanup funcs, storing/reading stuff out of the suite->log, etc.).

[1] In a subsequent patch, KUnit will allow running subsets of test
cases within a suite by making a copy of the suite w/ the filtered test
list. But there are other reasons KUnit might execute a copy, e.g. if it
ever wants to support parallel execution of different suites, recovering
from errors and restarting suites

Signed-off-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2021-10-19 14:18:49 -06:00
Xiyu Yang
f62314b1ce kunit: fix reference count leak in kfree_at_end
The reference counting issue happens in the normal path of
kfree_at_end(). When kunit_alloc_and_get_resource() is invoked, the
function forgets to handle the returned resource object, whose refcount
increased inside, causing a refcount leak.

Fix this issue by calling kunit_alloc_resource() instead of
kunit_alloc_and_get_resource().

Fixed the following when applying:
Shuah Khan <skhan@linuxfoundation.org>

CHECK: Alignment should match open parenthesis
+	kunit_alloc_resource(test, NULL, kfree_res_free, GFP_KERNEL,
 				     (void *)to_free);

Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Reviewed-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2021-10-01 13:49:38 -06:00
Linus Torvalds
b250e6d141 Kbuild updates for v5.15
- Add -s option (strict mode) to merge_config.sh to make it fail when
    any symbol is redefined.
 
  - Show a warning if a different compiler is used for building external
    modules.
 
  - Infer --target from ARCH for CC=clang to let you cross-compile the
    kernel without CROSS_COMPILE.
 
  - Make the integrated assembler default (LLVM_IAS=1) for CC=clang.
 
  - Add <linux/stdarg.h> to the kernel source instead of borrowing
    <stdarg.h> from the compiler.
 
  - Add Nick Desaulniers as a Kbuild reviewer.
 
  - Drop stale cc-option tests.
 
  - Fix the combination of CONFIG_TRIM_UNUSED_KSYMS and CONFIG_LTO_CLANG
    to handle symbols in inline assembly.
 
  - Show a warning if 'FORCE' is missing for if_changed rules.
 
  - Various cleanups
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Merge tag 'kbuild-v5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild updates from Masahiro Yamada:

 - Add -s option (strict mode) to merge_config.sh to make it fail when
   any symbol is redefined.

 - Show a warning if a different compiler is used for building external
   modules.

 - Infer --target from ARCH for CC=clang to let you cross-compile the
   kernel without CROSS_COMPILE.

 - Make the integrated assembler default (LLVM_IAS=1) for CC=clang.

 - Add <linux/stdarg.h> to the kernel source instead of borrowing
   <stdarg.h> from the compiler.

 - Add Nick Desaulniers as a Kbuild reviewer.

 - Drop stale cc-option tests.

 - Fix the combination of CONFIG_TRIM_UNUSED_KSYMS and CONFIG_LTO_CLANG
   to handle symbols in inline assembly.

 - Show a warning if 'FORCE' is missing for if_changed rules.

 - Various cleanups

* tag 'kbuild-v5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (39 commits)
  kbuild: redo fake deps at include/ksym/*.h
  kbuild: clean up objtool_args slightly
  modpost: get the *.mod file path more simply
  checkkconfigsymbols.py: Fix the '--ignore' option
  kbuild: merge vmlinux_link() between ARCH=um and other architectures
  kbuild: do not remove 'linux' link in scripts/link-vmlinux.sh
  kbuild: merge vmlinux_link() between the ordinary link and Clang LTO
  kbuild: remove stale *.symversions
  kbuild: remove unused quiet_cmd_update_lto_symversions
  gen_compile_commands: extract compiler command from a series of commands
  x86: remove cc-option-yn test for -mtune=
  arc: replace cc-option-yn uses with cc-option
  s390: replace cc-option-yn uses with cc-option
  ia64: move core-y in arch/ia64/Makefile to arch/ia64/Kbuild
  sparc: move the install rule to arch/sparc/Makefile
  security: remove unneeded subdir-$(CONFIG_...)
  kbuild: sh: remove unused install script
  kbuild: Fix 'no symbols' warning when CONFIG_TRIM_UNUSD_KSYMS=y
  kbuild: Switch to 'f' variants of integrated assembler flag
  kbuild: Shuffle blank line to improve comment meaning
  ...
2021-09-03 15:33:47 -07:00
Alexey Dobriyan
c0891ac15f isystem: ship and use stdarg.h
Ship minimal stdarg.h (1 type, 4 macros) as <linux/stdarg.h>.
stdarg.h is the only userspace header commonly used in the kernel.

GPL 2 version of <stdarg.h> can be extracted from
http://archive.debian.org/debian/pool/main/g/gcc-4.2/gcc-4.2_4.2.4.orig.tar.gz

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2021-08-19 09:02:55 +09:00
David Gow
acd8e8407b kunit: Print test statistics on failure
When a number of tests fail, it can be useful to get higher-level
statistics of how many tests are failing (or how many parameters are
failing in parameterised tests), and in what cases or suites. This is
already done by some non-KUnit tests, so add support for automatically
generating these for KUnit tests.

This change adds a 'kunit.stats_enabled' switch which has three values:
- 0: No stats are printed (current behaviour)
- 1: Stats are printed only for tests/suites with more than one
     subtest (new default)
- 2: Always print test statistics

For parameterised tests, the summary line looks as follows:
"    # inode_test_xtimestamp_decoding: pass:16 fail:0 skip:0 total:16"
For test suites, there are two lines looking like this:
"# ext4_inode_test: pass:1 fail:0 skip:0 total:1"
"# Totals: pass:16 fail:0 skip:0 total:16"

The first line gives the number of direct subtests, the second "Totals"
line is the accumulated sum of all tests and test parameters.

This format is based on the one used by kselftest[1].

[1]: https://elixir.bootlin.com/linux/latest/source/tools/testing/selftests/kselftest.h#L109

Signed-off-by: David Gow <davidgow@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2021-08-13 13:38:31 -06:00
Linus Torvalds
a48ad6e7a3 linux-kselftest-kunit-fixes-5.14-rc1
This KUnit update for Linux 5.14-rc1 consists of fixes and features:
 
 -- add support for skipped tests
 -- introduce kunit_kmalloc_array/kunit_kcalloc() helpers
 -- add gnu_printf specifiers
 -- add kunit_shutdown
 -- add unit test for filtering suites by names
 -- convert lib/test_list_sort.c to use KUnit
 -- code organization moving default config to tools/testing/kunit
 -- refactor of internal parser input handling
 -- cleanups and updates to documentation
 -- code cleanup related to casts
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Merge tag 'linux-kselftest-kunit-fixes-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

Pull KUnit update from Shuah Khan:
 "Fixes and features:

   - add support for skipped tests

   - introduce kunit_kmalloc_array/kunit_kcalloc() helpers

   - add gnu_printf specifiers

   - add kunit_shutdown

   - add unit test for filtering suites by names

   - convert lib/test_list_sort.c to use KUnit

   - code organization moving default config to tools/testing/kunit

   - refactor of internal parser input handling

   - cleanups and updates to documentation

   - code cleanup related to casts"

* tag 'linux-kselftest-kunit-fixes-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest: (29 commits)
  kunit: add unit test for filtering suites by names
  kasan: test: make use of kunit_skip()
  kunit: test: Add example tests which are always skipped
  kunit: tool: Support skipped tests in kunit_tool
  kunit: Support skipped tests
  thunderbolt: test: Reinstate a few casts of bitfields
  kunit: tool: internal refactor of parser input handling
  lib/test: convert lib/test_list_sort.c to use KUnit
  kunit: introduce kunit_kmalloc_array/kunit_kcalloc() helpers
  kunit: Remove the unused all_tests.config
  kunit: Move default config from arch/um -> tools/testing/kunit
  kunit: arch/um/configs: Enable KUNIT_ALL_TESTS by default
  kunit: Add gnu_printf specifiers
  lib/cmdline_kunit: Remove a cast which are no-longer required
  kernel/sysctl-test: Remove some casts which are no-longer required
  thunderbolt: test: Remove some casts which are no longer required
  mmc: sdhci-of-aspeed: Remove some unnecessary casts from KUnit tests
  iio: Remove a cast in iio-test-format which is no longer required
  device property: Remove some casts in property-entry-test
  Documentation: kunit: Clean up some string casts in examples
  ...
2021-07-02 12:58:26 -07:00
Vlastimil Babka
26c6cb7cf8 kunit: make test->lock irq safe
The upcoming SLUB kunit test will be calling kunit_find_named_resource()
from a context with disabled interrupts.  That means kunit's test->lock
needs to be IRQ safe to avoid potential deadlocks and lockdep splats.

This patch therefore changes the test->lock usage to spin_lock_irqsave()
and spin_unlock_irqrestore().

Link: https://lkml.kernel.org/r/20210511150734.3492-1-glittao@gmail.com
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Oliver Glitta <glittao@gmail.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Daniel Latypov <dlatypov@google.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Marco Elver <elver@google.com>
Cc: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2021-06-29 10:53:46 -07:00
Daniel Latypov
1d71307a6f kunit: add unit test for filtering suites by names
This adds unit tests for kunit_filter_subsuite() and
kunit_filter_suites().

Note: what the executor means by "subsuite" is the array of suites
corresponding to each test file.

This patch lightly refactors executor.c to avoid the use of global
variables to make it testable.
It also includes a clever `kfree_at_end()` helper that makes this test
easier to write than it otherwise would have been.

Tested by running just the new tests using itself
$ ./tools/testing/kunit/kunit.py run '*exec*'

Signed-off-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: David Gow <davidgow@google.com>
Acked-by: Brendan Higgins <brendanhiggins@google.com>
Tested-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2021-06-25 11:44:37 -06:00
David Gow
d99ea67514 kunit: test: Add example tests which are always skipped
Add two new tests to the example test suite, both of which are always
skipped. This is used as an example for how to write tests which are
skipped, and to demonstrate the difference between kunit_skip() and
kunit_mark_skipped().

Note that these tests are enabled by default, so a default run of KUnit
will have two skipped tests.

Signed-off-by: David Gow <davidgow@google.com>
Reviewed-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2021-06-25 11:31:03 -06:00
David Gow
6d2426b2f2 kunit: Support skipped tests
The kunit_mark_skipped() macro marks the current test as "skipped", with
the provided reason. The kunit_skip() macro will mark the test as
skipped, and abort the test.

The TAP specification supports this "SKIP directive" as a comment after
the "ok" / "not ok" for a test. See the "Directives" section of the TAP
spec for details:
https://testanything.org/tap-specification.html#directives

The 'success' field for KUnit tests is replaced with a kunit_status
enum, which can be SUCCESS, FAILURE, or SKIPPED, combined with a
'status_comment' containing information on why a test was skipped.

A new 'kunit_status' test suite is added to test this.

Signed-off-by: David Gow <davidgow@google.com>
Tested-by: Marco Elver <elver@google.com>
Reviewed-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2021-06-25 11:31:03 -06:00
Daniel Latypov
7122debb43 kunit: introduce kunit_kmalloc_array/kunit_kcalloc() helpers
Add in:
* kunit_kmalloc_array() and wire up kunit_kmalloc() to be a special
case of it.
* kunit_kcalloc() for symmetry with kunit_kzalloc()

This should using KUnit more natural by making it more similar to the
existing *alloc() APIs.

And while we shouldn't necessarily be writing unit tests where overflow
should be a concern, it can't hurt to be safe.

Signed-off-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: David Gow <davidgow@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2021-06-25 11:31:03 -06:00
David Gow
44acdbb250 kunit: Add gnu_printf specifiers
Some KUnit functions use variable arguments to implement a printf-like
format string. Use the __printf() attribute to let the compiler warn if
invalid format strings are passed in.

If the kernel is build with W=1, it complained about the lack of these
specifiers, e.g.:
../lib/kunit/test.c:72:2: warning: function ‘kunit_log_append’ might be a candidate for ‘gnu_printf’ format attribute [-Wsuggest-attribute=format]

Signed-off-by: David Gow <davidgow@google.com>
Reviewed-by: Daniel Latypov <dlatypov@google.com>
Acked-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2021-06-23 17:06:04 -06:00
David Gow
b6d5799b0b kunit: Add 'kunit_shutdown' option
Add a new kernel command-line option, 'kunit_shutdown', which allows the
user to specify that the kernel poweroff, halt, or reboot after
completing all KUnit tests; this is very handy for running KUnit tests
on UML or a VM so that the UML/VM process exits cleanly immediately
after running all tests without needing a special initramfs.

Signed-off-by: David Gow <davidgow@google.com>
Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Tested-By: Daniel Latypov <dlatypov@google.com>
Reviewed-by: Daniel Latypov <dlatypov@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2021-06-11 16:04:57 -06:00
David Gow
384426bd10 kunit: Fix result propagation for parameterised tests
When one parameter of a parameterised test failed, its failure would be
propagated to the overall test, but not to the suite result (unless it
was the last parameter).

This is because test_case->success was being reset to the test->success
result after each parameter was used, so a failing test's result would
be overwritten by a non-failing result. The overall test result was
handled in a third variable, test_result, but this was discarded after
the status line was printed.

Instead, just propagate the result after each parameter run.

Signed-off-by: David Gow <davidgow@google.com>
Fixes: fadb08e7c7 ("kunit: Support for Parameterized Testing")
Reviewed-by: Marco Elver <elver@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2021-06-11 15:50:38 -06:00
Uriel Guajardo
359a376081 kunit: support failure from dynamic analysis tools
Add a kunit_fail_current_test() function to fail the currently running
test, if any, with an error message.

This is largely intended for dynamic analysis tools like UBSAN and for
fakes.
E.g. say I had a fake ops struct for testing and I wanted my `free`
function to complain if it was called with an invalid argument, or
caught a double-free. Most return void and have no normal means of
signalling failure (e.g. super_operations, iommu_ops, etc.).

Key points:
* Always update current->kunit_test so anyone can use it.
  * commit 83c4e7a036 ("KUnit: KASAN Integration") only updated it for
  CONFIG_KASAN=y

* Create a new header <kunit/test-bug.h> so non-test code doesn't have
to include all of <kunit/test.h> (e.g. lib/ubsan.c)

* Forward the file and line number to make it easier to track down
failures

* Declare the helper function for nice __printf() warnings about mismatched
format strings even when KUnit is not enabled.

Example output from kunit_fail_current_test("message"):
[15:19:34] [FAILED] example_simple_test
[15:19:34]     # example_simple_test: initializing
[15:19:34]     # example_simple_test: lib/kunit/kunit-example-test.c:24: message
[15:19:34]     not ok 1 - example_simple_test

Fixed minor check patch with checkpatch --fix option:
Shuah Khan <skhan@linuxfoundation.org>

Signed-off-by: Daniel Latypov <dlatypov@google.com>
Signed-off-by: Uriel Guajardo <urielguajardo@google.com>
Reviewed-by: Alan Maguire <alan.maguire@oracle.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2021-04-02 14:19:58 -06:00
Daniel Latypov
9854781dba kunit: tool: make --kunitconfig accept dirs, add lib/kunit fragment
TL;DR
$ ./tools/testing/kunit/kunit.py run --kunitconfig=lib/kunit

Per suggestion from Ted [1], we can reduce the amount of typing by
assuming a convention that these files are named '.kunitconfig'.

In the case of [1], we now have
$ ./tools/testing/kunit/kunit.py run --kunitconfig=fs/ext4

Also add in such a fragment for kunit itself so we can give that as an
example more close to home (and thus less likely to be accidentally
broken).

[1] https://lore.kernel.org/linux-ext4/YCNF4yP1dB97zzwD@mit.edu/

Signed-off-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: David Gow <davidgow@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2021-04-02 14:14:36 -06:00
Daniel Latypov
acd976253c kunit: make KUNIT_EXPECT_STREQ() quote values, don't print literals
Before:
>  Expected str == "world", but
>      str == hello
>      "world" == world

After:
>  Expected str == "world", but
>      str == "hello"
<we don't need to tell the user that "world" == "world">

Note: like the literal ellision for integers, this doesn't handle the
case of
  KUNIT_EXPECT_STREQ(test, "hello", "world")
since we don't expect it to realistically happen in checked in tests.
(If you really wanted a test to fail, KUNIT_FAIL("msg") exists)

In that case, you'd get:
>  Expected "hello" == "world", but
<output for next failure>

Signed-off-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2021-04-02 14:14:16 -06:00