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From: Daniel Latypov <dlatypov@google.com>
To: Kees Cook <keescook@chromium.org>
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Subject: Re: [PATCH 03/32] flex_array: Add Kunit tests
Date: Wed, 4 May 2022 14:58:02 -0500	[thread overview]
Message-ID: <CAGS_qxrPauYtkrfB37ne9bOXJR2JQc4=jaJP5tGN4mnha7mANg@mail.gmail.com> (raw)
In-Reply-To: <20220504014440.3697851-4-keescook@chromium.org>

On Tue, May 3, 2022 at 8:47 PM Kees Cook <keescook@chromium.org> wrote:
> +#define COMPARE_STRUCTS(STRUCT_A, STRUCT_B)    do {                    \
> +       STRUCT_A *ptr_A;                                                \
> +       STRUCT_B *ptr_B;                                                \
> +       int rc;                                                         \
> +       size_t size_A, size_B;                                          \
> +                                                                       \
> +       /* matching types for flex array elements and count */          \
> +       KUNIT_EXPECT_EQ(test, sizeof(*ptr_A), sizeof(*ptr_B));          \
> +       KUNIT_EXPECT_TRUE(test, __same_type(*ptr_A->data,               \
> +               *ptr_B->__flex_array_elements));                        \

Leaving some minor suggestions to go along with David's comments.

Should we make these KUNIT_ASSERT_.* instead?
I assume if we have a type-mismatch, then we should bail out instead
of continuing to produce more error messages.

> +       KUNIT_EXPECT_TRUE(test, __same_type(ptr_A->datalen,             \
> +               ptr_B->__flex_array_elements_count));                   \
> +       KUNIT_EXPECT_EQ(test, sizeof(*ptr_A->data),                     \
> +                             sizeof(*ptr_B->__flex_array_elements));   \
> +       KUNIT_EXPECT_EQ(test, offsetof(typeof(*ptr_A), data),           \
> +                             offsetof(typeof(*ptr_B),                  \
> +                                      __flex_array_elements));         \
> +       KUNIT_EXPECT_EQ(test, offsetof(typeof(*ptr_A), datalen),        \
> +                             offsetof(typeof(*ptr_B),                  \
> +                                      __flex_array_elements_count));   \
> +                                                                       \
> +       /* struct_size() vs __fas_bytes() */                            \
> +       size_A = struct_size(ptr_A, data, 13);                          \
> +       rc = __fas_bytes(ptr_B, __flex_array_elements,                  \
> +                        __flex_array_elements_count, 13, &size_B);     \
> +       KUNIT_EXPECT_EQ(test, rc, 0);                                   \

Hmm, what do you think about inlining the call/dropping rc?

i.e. something like
KUNIT_EXPECT_EQ(test, 0, __fas_bytes(ptr_B, __flex_array_elements, \
                        __flex_array_elements_count, 13, &size_B));

That would give a slightly clearer error message on failure.
Otherwise the user only really gets a line number to try and start to
understand what went wrong.

> +
> +#define CHECK_COPY(ptr)                do {                                            \
> +       typeof(*(ptr)) *_cc_dst = (ptr);                                        \
> +       KUNIT_EXPECT_EQ(test, _cc_dst->induce_padding, 0);                      \
> +       memcpy(&padding, &_cc_dst->induce_padding + sizeof(_cc_dst->induce_padding), \
> +              sizeof(padding));                                                \
> +       /* Padding should be zero too. */                                       \
> +       KUNIT_EXPECT_EQ(test, padding, 0);                                      \
> +       KUNIT_EXPECT_EQ(test, src->count, _cc_dst->count);                      \

This also seems like a good place to use ASSERT instead of EXPECT.


> +       KUNIT_EXPECT_EQ(test, _cc_dst->count, TEST_TARGET);                     \
> +       for (i = 0; i < _cc_dst->count - 1; i++) {                              \
> +               /* 'A' is 0x41, and here repeated in a u32. */                  \
> +               KUNIT_EXPECT_EQ(test, _cc_dst->flex[i], 0x41414141);            \
> +       }                                                                       \
> +       /* Last item should be different. */                                    \
> +       KUNIT_EXPECT_EQ(test, _cc_dst->flex[_cc_dst->count - 1], 0x14141414);   \
> +} while (0)
> +
> +/* Test copying from one flexible array struct into another. */
> +static void flex_cpy_test(struct kunit *test)
> +{
> +#define TEST_BOUNDS    13
> +#define TEST_TARGET    12
> +#define TEST_SMALL     10
> +       struct flex_cpy_obj *src, *dst;
> +       unsigned long padding;
> +       int i, rc;
> +
> +       /* Prepare open-coded source. */
> +       src = kzalloc(struct_size(src, flex, TEST_BOUNDS), GFP_KERNEL);

Looks like we could use kunit_kzalloc() here and avoid needing the
manual call to kfree?
This also holds for the other test cases where they don't have early
calls to kfree().

Doing so would also let you use KUNIT_ASSERT's without fear of leaking
these allocations.

> +       src->count = TEST_BOUNDS;
> +       memset(src->flex, 'A', flex_array_size(src, flex, TEST_BOUNDS));
> +       src->flex[src->count - 2] = 0x14141414;
> +       src->flex[src->count - 1] = 0x24242424;
> +
> +       /* Prepare open-coded destination, alloc only. */
> +       dst = kzalloc(struct_size(src, flex, TEST_BOUNDS), GFP_KERNEL);
> +       /* Pre-fill with 0xFE marker. */
> +       memset(dst, 0xFE, struct_size(src, flex, TEST_BOUNDS));
> +       /* Pretend we're 1 element smaller. */
> +       dst->count = TEST_TARGET;
> +
> +       /* Pretend to match the target destination size. */
> +       src->count = TEST_TARGET;
> +
> +       rc = flex_cpy(dst, src);
> +       KUNIT_EXPECT_EQ(test, rc, 0);
> +       CHECK_COPY(dst);
> +       /* Item past last copied item is unchanged from initial memset. */
> +       KUNIT_EXPECT_EQ(test, dst->flex[dst->count], 0xFEFEFEFE);
> +
> +       /* Now trip overflow, and verify we didn't clobber beyond end. */
> +       src->count = TEST_BOUNDS;
> +       rc = flex_cpy(dst, src);
> +       KUNIT_EXPECT_EQ(test, rc, -E2BIG);
> +       /* Item past last copied item is unchanged from initial memset. */
> +       KUNIT_EXPECT_EQ(test, dst->flex[dst->count], 0xFEFEFEFE);
> +
> +       /* Reset destination contents. */
> +       memset(dst, 0xFD, struct_size(src, flex, TEST_BOUNDS));
> +       dst->count = TEST_TARGET;
> +
> +       /* Copy less than max. */
> +       src->count = TEST_SMALL;
> +       rc = flex_cpy(dst, src);
> +       KUNIT_EXPECT_EQ(test, rc, 0);
> +       /* Verify count was adjusted. */
> +       KUNIT_EXPECT_EQ(test, dst->count, TEST_SMALL);

Just an FYI, macros get evaluated before the expect macros can stringify them.
So the error message would look something like
  Expected dest->count == 10
     but dest->count = 9

Not a big concern, but just noting that "TEST_SMALL" won't be visible at all.
Could opt for

KUNIT_EXPECT_EQ_MSG(test, dst->count, TEST_SMALL, "my custom extra message");

if you think it'd be usable to make the test more grokkable.

> +       /* Verify element beyond src size was wiped. */
> +       KUNIT_EXPECT_EQ(test, dst->flex[TEST_SMALL], 0);
> +       /* Verify element beyond original dst size was untouched. */
> +       KUNIT_EXPECT_EQ(test, dst->flex[TEST_TARGET], 0xFDFDFDFD);
> +
> +       kfree(dst);
> +       kfree(src);
> +#undef TEST_BOUNDS
> +#undef TEST_TARGET
> +#undef TEST_SMALL
> +}
> +
> +static void flex_dup_test(struct kunit *test)
> +{
> +#define TEST_TARGET    12
> +       struct flex_cpy_obj *src, *dst = NULL, **null = NULL;
> +       struct flex_dup_obj *encap = NULL;
> +       unsigned long padding;
> +       int i, rc;
> +
> +       /* Prepare open-coded source. */
> +       src = kzalloc(struct_size(src, flex, TEST_TARGET), GFP_KERNEL);
> +       src->count = TEST_TARGET;
> +       memset(src->flex, 'A', flex_array_size(src, flex, TEST_TARGET));
> +       src->flex[src->count - 1] = 0x14141414;
> +
> +       /* Reject NULL @alloc. */
> +       rc = flex_dup(null, src, GFP_KERNEL);
> +       KUNIT_EXPECT_EQ(test, rc, -EINVAL);
> +
> +       /* Check good copy. */
> +       rc = flex_dup(&dst, src, GFP_KERNEL);
> +       KUNIT_EXPECT_EQ(test, rc, 0);
> +       KUNIT_ASSERT_TRUE(test, dst != NULL);
> +       CHECK_COPY(dst);
> +
> +       /* Reject non-NULL *@alloc. */
> +       rc = flex_dup(&dst, src, GFP_KERNEL);
> +       KUNIT_EXPECT_EQ(test, rc, -EINVAL);
> +
> +       kfree(dst);
> +
> +       /* Check good encap copy. */
> +       rc = __flex_dup(&encap, .fas, src, GFP_KERNEL);
> +       KUNIT_EXPECT_EQ(test, rc, 0);
> +       KUNIT_ASSERT_TRUE(test, dst != NULL);

FYI, there's a new KUNIT_ASSERT_NOT_NULL() macro in the
-kselftest/kunit branch,
https://patchwork.kernel.org/project/linux-kselftest/patch/20220211164246.410079-1-ribalda@chromium.org/

But that's not planned for inclusion into mainline until 5.19, so
leaving this as-is is better for now.

  parent reply	other threads:[~2022-05-04 19:58 UTC|newest]

Thread overview: 71+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-04  1:44 [PATCH 00/32] Introduce flexible array struct memcpy() helpers Kees Cook
2022-05-04  1:44 ` [PATCH 01/32] netlink: Avoid memcpy() across flexible array boundary Kees Cook
2022-05-04  3:12   ` Introduce flexible array struct memcpy() helpers bluez.test.bot
2022-05-04  3:31   ` [PATCH 01/32] netlink: Avoid memcpy() across flexible array boundary Gustavo A. R. Silva
2022-05-04  3:37     ` Kees Cook
2022-05-04  1:44 ` [PATCH 02/32] Introduce flexible array struct memcpy() helpers Kees Cook
2022-05-04  7:25   ` Johannes Berg
2022-05-04 15:38     ` Kees Cook
2022-05-04 16:08       ` David Laight
2022-05-05 13:16       ` Johannes Berg
2022-05-05 15:16         ` Keith Packard
2022-05-05 19:32           ` Kees Cook
2022-05-05 20:08             ` Keith Packard
2022-05-05 20:12               ` Johannes Berg
2022-05-06 11:15                 ` David Laight
2022-05-06 11:15                   ` David Laight
2022-05-05 19:27         ` Kees Cook
2022-05-04  1:44 ` [PATCH 03/32] flex_array: Add Kunit tests Kees Cook
2022-05-04  3:00   ` David Gow
2022-05-04 19:43     ` Kees Cook
2022-05-04 19:58   ` Daniel Latypov [this message]
2022-05-04  1:44 ` [PATCH 04/32] fortify: Add run-time WARN for cross-field memcpy() Kees Cook
2022-05-04  1:44 ` [PATCH 05/32] brcmfmac: Use mem_to_flex_dup() with struct brcmf_fweh_queue_item Kees Cook
2022-05-16 12:49   ` Arend van Spriel
2022-05-17  3:57     ` Kees Cook
2022-05-04  1:44 ` [PATCH 06/32] iwlwifi: calib: Prepare to use mem_to_flex_dup() Kees Cook
2022-05-04  1:44 ` [PATCH 07/32] iwlwifi: calib: Use mem_to_flex_dup() with struct iwl_calib_result Kees Cook
2022-05-04  1:44 ` [PATCH 08/32] iwlwifi: mvm: Use mem_to_flex_dup() with struct ieee80211_key_conf Kees Cook
2022-05-04  1:44 ` [PATCH 09/32] p54: Use mem_to_flex_dup() with struct p54_cal_database Kees Cook
2022-05-04  1:44 ` [PATCH 10/32] wcn36xx: Use mem_to_flex_dup() with struct wcn36xx_hal_ind_msg Kees Cook
2022-05-04  5:42   ` Kalle Valo
2022-05-04 15:08     ` Kees Cook
2022-05-04  1:44 ` [PATCH 11/32] nl80211: Use mem_to_flex_dup() with struct cfg80211_cqm_config Kees Cook
2022-05-04  1:44 ` [PATCH 12/32] cfg80211: Use mem_to_flex_dup() with struct cfg80211_bss_ies Kees Cook
2022-05-04  7:28   ` Johannes Berg
2022-05-04 15:13     ` Kees Cook
2022-05-04  1:44 ` [PATCH 13/32] mac80211: Use mem_to_flex_dup() with several structs Kees Cook
2022-05-04  1:44 ` [PATCH 14/32] af_unix: Use mem_to_flex_dup() with struct unix_address Kees Cook
2022-05-04  1:44 ` [PATCH 15/32] 802/garp: Use mem_to_flex_dup() with struct garp_attr Kees Cook
2022-05-04  1:44 ` [PATCH 16/32] 802/mrp: Use mem_to_flex_dup() with struct mrp_attr Kees Cook
2022-05-04  1:44 ` [PATCH 17/32] net/flow_offload: Use mem_to_flex_dup() with struct flow_action_cookie Kees Cook
2022-05-04  1:44 ` [PATCH 18/32] firewire: Use __mem_to_flex_dup() with struct iso_interrupt_event Kees Cook
2022-05-04  1:44 ` [PATCH 19/32] afs: Use mem_to_flex_dup() with struct afs_acl Kees Cook
2022-05-04  1:44 ` [PATCH 20/32] ASoC: sigmadsp: Use mem_to_flex_dup() with struct sigmadsp_data Kees Cook
2022-05-04 15:17   ` Mark Brown
2022-05-04  1:44 ` [PATCH 21/32] soc: qcom: apr: Use mem_to_flex_dup() with struct apr_rx_buf Kees Cook
2022-05-04  1:44 ` [PATCH 22/32] atags_proc: Use mem_to_flex_dup() with struct buffer Kees Cook
2022-05-04  1:44 ` [PATCH 23/32] Bluetooth: Use mem_to_flex_dup() with struct hci_op_configure_data_path Kees Cook
2022-05-04  1:44 ` [PATCH 24/32] IB/hfi1: Use mem_to_flex_dup() for struct tid_rb_node Kees Cook
2022-05-04  1:44 ` [PATCH 25/32] Drivers: hv: utils: Use mem_to_flex_dup() with struct cn_msg Kees Cook
2022-05-04  1:44 ` [PATCH 26/32] ima: Use mem_to_flex_dup() with struct modsig Kees Cook
2022-05-04  1:44 ` [PATCH 27/32] KEYS: Use mem_to_flex_dup() with struct user_key_payload Kees Cook
2022-05-04  1:44 ` [PATCH 28/32] selinux: Use mem_to_flex_dup() with xfrm and sidtab Kees Cook
2022-05-04 22:57   ` Paul Moore
2022-05-04 23:43     ` Gustavo A. R. Silva
2022-05-05  3:14       ` Paul Moore
2022-05-05 18:39         ` Kees Cook
2022-05-05 23:16           ` Paul Moore
2022-05-06  1:08             ` Gustavo A. R. Silva
2022-05-04  1:44 ` [PATCH 29/32] xtensa: Use mem_to_flex_dup() with struct property Kees Cook
2022-05-04 18:09   ` Rob Herring
2022-05-04 18:09     ` Rob Herring
2022-05-04  1:44 ` [PATCH 30/32] usb: gadget: f_fs: Use mem_to_flex_dup() with struct ffs_buffer Kees Cook
2022-05-04  1:44 ` [PATCH 31/32] xenbus: Use mem_to_flex_dup() with struct read_buffer Kees Cook
2022-05-04  1:44 ` [PATCH 32/32] esas2r: Use __mem_to_flex() with struct atto_ioctl Kees Cook
2022-05-12 21:41 ` [PATCH 19/32] afs: Use mem_to_flex_dup() with struct afs_acl David Howells
2022-05-12 21:41   ` David Howells
2022-05-13 15:44   ` Kees Cook
2022-05-13 15:44     ` Kees Cook
2022-05-12 21:47 ` [PATCH 00/32] Introduce flexible array struct memcpy() helpers David Howells
2022-05-12 21:47   ` David Howells

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