[PATCH] ASoC: cs-amp-lib-test: Force test calibration blob entries to be valid

[PATCH] ASoC: cs-amp-lib-test: Force test calibration blob entries to be valid

[Richard Fitzgerald]

For a normal calibration blob the calTarget values must be non-zero and
unique, and the calTime values must be non-zero. Don't rely on
get_random_bytes() to be random enough to guarantee this. Force the
calTarget and calTime values to be valid while retaining randomness
in the values.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Fixes: 177862317a98 ("ASoC: cs-amp-lib: Add KUnit test for calibration helpers")
---
 sound/soc/codecs/cs-amp-lib-test.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/sound/soc/codecs/cs-amp-lib-test.c b/sound/soc/codecs/cs-amp-lib-test.c
index 15f991b2e16e..8169ec88a8ba 100644
--- a/sound/soc/codecs/cs-amp-lib-test.c
+++ b/sound/soc/codecs/cs-amp-lib-test.c
@@ -38,6 +38,7 @@ static void cs_amp_lib_test_init_dummy_cal_blob(struct kunit *test, int num_amps
 {
 	struct cs_amp_lib_test_priv *priv = test->priv;
 	unsigned int blob_size;
+	int i;
 
 	blob_size = offsetof(struct cirrus_amp_efi_data, data) +
 		    sizeof(struct cirrus_amp_cal_data) * num_amps;
@@ -49,6 +50,14 @@ static void cs_amp_lib_test_init_dummy_cal_blob(struct kunit *test, int num_amps
 	priv->cal_blob->count = num_amps;
 
 	get_random_bytes(priv->cal_blob->data, sizeof(struct cirrus_amp_cal_data) * num_amps);
+
+	/* Ensure all timestamps are non-zero to mark the entry valid. */
+	for (i = 0; i < num_amps; i++)
+		priv->cal_blob->data[i].calTime[0] |= 1;
+
+	/* Ensure that all UIDs are non-zero and unique. */
+	for (i = 0; i < num_amps; i++)
+		*(u8 *)&priv->cal_blob->data[i].calTarget[0] = i + 1;
 }
 
 static u64 cs_amp_lib_test_get_target_uid(struct kunit *test)
-- 
2.39.2

Re: [PATCH] ASoC: cs-amp-lib-test: Force test calibration blob entries to be valid

[Mark Brown]

On Thu, 22 Aug 2024 12:57:25 +0100, Richard Fitzgerald wrote:
> For a normal calibration blob the calTarget values must be non-zero and
> unique, and the calTime values must be non-zero. Don't rely on
> get_random_bytes() to be random enough to guarantee this. Force the
> calTarget and calTime values to be valid while retaining randomness
> in the values.
> 
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next

Thanks!

[1/1] ASoC: cs-amp-lib-test: Force test calibration blob entries to be valid
      commit: bff980d8d9ca537fd5f3c0e9a99876c1e3713e81

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark