selftests/bpf: Reject graph kptr use after RCU unlockgrafted

Add a sleepable verifier test that loads a graph-node local kptr in an
explicit RCU read-side critical section, then passes its node to
bpf_rbtree_remove() after the section ends.

Before the verifier fix, the stale NON_OWN_REF flag makes the node look like
a live borrowed reference and the program is accepted. After the fix, the
pointer is demoted without NON_OWN_REF and the graph kfunc argument is
rejected.

Also exercise a graph kptr loaded while a spin lock provides implicit RCU
protection. The pointer must be invalidated when the lock is released, which
guards the required ordering between non-owning-reference invalidation and
RCU demotion.

Update the existing fault-protected load test state description. The
post-unlock pointer no longer carries NON_OWN_REF, but remains readable
because the load is rewritten to use BPF_PROBE_MEM.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 95 insertions, 0 deletions

diff --git a/sound/soc/codecs/ads117x.c b/sound/soc/codecs/ads117x.c
new file mode 100644
index 000000000..44aa06e03
--- /dev/null
+++ b/sound/soc/codecs/ads117x.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * ads117x.c  --  Driver for ads1174/8 ADC chips
+ *
+ * Copyright 2009 ShotSpotter Inc.
+ * Author: Graeme Gregory <gg@slimlogic.co.uk>
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+
+#include <linux/of.h>
+
+#define ADS117X_RATES (SNDRV_PCM_RATE_8000_48000)
+#define ADS117X_FORMATS (SNDRV_PCM_FMTBIT_S16_LE)
+
+static const struct snd_soc_dapm_widget ads117x_dapm_widgets[] = {
+SND_SOC_DAPM_INPUT("Input1"),
+SND_SOC_DAPM_INPUT("Input2"),
+SND_SOC_DAPM_INPUT("Input3"),
+SND_SOC_DAPM_INPUT("Input4"),
+SND_SOC_DAPM_INPUT("Input5"),
+SND_SOC_DAPM_INPUT("Input6"),
+SND_SOC_DAPM_INPUT("Input7"),
+SND_SOC_DAPM_INPUT("Input8"),
+};
+
+static const struct snd_soc_dapm_route ads117x_dapm_routes[] = {
+	{ "Capture", NULL, "Input1" },
+	{ "Capture", NULL, "Input2" },
+	{ "Capture", NULL, "Input3" },
+	{ "Capture", NULL, "Input4" },
+	{ "Capture", NULL, "Input5" },
+	{ "Capture", NULL, "Input6" },
+	{ "Capture", NULL, "Input7" },
+	{ "Capture", NULL, "Input8" },
+};
+
+static struct snd_soc_dai_driver ads117x_dai = {
+/* ADC */
+	.name = "ads117x-hifi",
+	.capture = {
+		.stream_name = "Capture",
+		.channels_min = 1,
+		.channels_max = 32,
+		.rates = ADS117X_RATES,
+		.formats = ADS117X_FORMATS,},
+};
+
+static const struct snd_soc_component_driver soc_component_dev_ads117x = {
+	.dapm_widgets		= ads117x_dapm_widgets,
+	.num_dapm_widgets	= ARRAY_SIZE(ads117x_dapm_widgets),
+	.dapm_routes		= ads117x_dapm_routes,
+	.num_dapm_routes	= ARRAY_SIZE(ads117x_dapm_routes),
+	.idle_bias_on		= 1,
+	.use_pmdown_time	= 1,
+	.endianness		= 1,
+};
+
+static int ads117x_probe(struct platform_device *pdev)
+{
+	return devm_snd_soc_register_component(&pdev->dev,
+			&soc_component_dev_ads117x, &ads117x_dai, 1);
+}
+
+#if defined(CONFIG_OF)
+static const struct of_device_id ads117x_dt_ids[] = {
+	{ .compatible = "ti,ads1174" },
+	{ .compatible = "ti,ads1178" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, ads117x_dt_ids);
+#endif
+
+static struct platform_driver ads117x_codec_driver = {
+	.driver = {
+			.name = "ads117x-codec",
+			.of_match_table = of_match_ptr(ads117x_dt_ids),
+	},
+
+	.probe = ads117x_probe,
+};
+
+module_platform_driver(ads117x_codec_driver);
+
+MODULE_DESCRIPTION("ASoC ads117x driver");
+MODULE_AUTHOR("Graeme Gregory");
+MODULE_LICENSE("GPL");