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, 96 insertions, 0 deletions

diff --git a/sound/soc/codecs/rt1318-sdw.h b/sound/soc/codecs/rt1318-sdw.h
new file mode 100644
index 000000000..86e83d63a
--- /dev/null
+++ b/sound/soc/codecs/rt1318-sdw.h
@@ -0,0 +1,96 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * rt1318-sdw.h -- RT1318 SDCA ALSA SoC audio driver header
+ *
+ * Copyright(c) 2022 Realtek Semiconductor Corp.
+ */
+
+#ifndef __RT1318_SDW_H__
+#define __RT1318_SDW_H__
+
+#include <linux/regmap.h>
+#include <linux/soundwire/sdw.h>
+#include <linux/soundwire/sdw_type.h>
+#include <linux/soundwire/sdw_registers.h>
+#include <sound/soc.h>
+
+/* imp-defined registers */
+#define RT1318_SAPU_SM 0x3203
+
+#define R1318_TCON	0xc203
+#define R1318_TCON_RELATED_1	0xc206
+
+#define R1318_SPK_TEMPERATRUE_PROTECTION_0	0xdb00
+#define R1318_SPK_TEMPERATRUE_PROTECTION_L_4	0xdb08
+#define R1318_SPK_TEMPERATRUE_PROTECTION_R_4	0xdd08
+
+#define R1318_SPK_TEMPERATRUE_PROTECTION_L_6	0xdb12
+#define R1318_SPK_TEMPERATRUE_PROTECTION_R_6	0xdd12
+
+#define RT1318_INIT_RECIPROCAL_REG_L_24		0xdbb5
+#define RT1318_INIT_RECIPROCAL_REG_L_23_16	0xdbb6
+#define RT1318_INIT_RECIPROCAL_REG_L_15_8	0xdbb7
+#define RT1318_INIT_RECIPROCAL_REG_L_7_0	0xdbb8
+#define RT1318_INIT_RECIPROCAL_REG_R_24		0xddb5
+#define RT1318_INIT_RECIPROCAL_REG_R_23_16	0xddb6
+#define RT1318_INIT_RECIPROCAL_REG_R_15_8	0xddb7
+#define RT1318_INIT_RECIPROCAL_REG_R_7_0	0xddb8
+
+#define RT1318_INIT_R0_RECIPROCAL_SYN_L_24 0xdbc5
+#define RT1318_INIT_R0_RECIPROCAL_SYN_L_23_16 0xdbc6
+#define RT1318_INIT_R0_RECIPROCAL_SYN_L_15_8 0xdbc7
+#define RT1318_INIT_R0_RECIPROCAL_SYN_L_7_0 0xdbc8
+#define RT1318_INIT_R0_RECIPROCAL_SYN_R_24 0xddc5
+#define RT1318_INIT_R0_RECIPROCAL_SYN_R_23_16 0xddc6
+#define RT1318_INIT_R0_RECIPROCAL_SYN_R_15_8 0xddc7
+#define RT1318_INIT_R0_RECIPROCAL_SYN_R_7_0 0xddc8
+
+#define RT1318_R0_COMPARE_FLAG_L	0xdb35
+#define RT1318_R0_COMPARE_FLAG_R	0xdd35
+
+#define RT1318_STP_INITIAL_RS_TEMP_H 0xdd93
+#define RT1318_STP_INITIAL_RS_TEMP_L 0xdd94
+
+/* RT1318 SDCA Control - function number */
+#define FUNC_NUM_SMART_AMP 0x04
+
+/* RT1318 SDCA entity */
+#define RT1318_SDCA_ENT_PDE23 0x31
+#define RT1318_SDCA_ENT_XU24 0x24
+#define RT1318_SDCA_ENT_FU21 0x03
+#define RT1318_SDCA_ENT_UDMPU21 0x02
+#define RT1318_SDCA_ENT_CS21 0x21
+#define RT1318_SDCA_ENT_SAPU 0x29
+
+/* RT1318 SDCA control */
+#define RT1318_SDCA_CTL_SAMPLE_FREQ_INDEX 0x10
+#define RT1318_SDCA_CTL_REQ_POWER_STATE 0x01
+#define RT1318_SDCA_CTL_FU_MUTE 0x01
+#define RT1318_SDCA_CTL_FU_VOLUME 0x02
+#define RT1318_SDCA_CTL_UDMPU_CLUSTER 0x10
+#define RT1318_SDCA_CTL_SAPU_PROTECTION_MODE 0x10
+#define RT1318_SDCA_CTL_SAPU_PROTECTION_STATUS 0x11
+
+/* RT1318 SDCA channel */
+#define CH_L 0x01
+#define CH_R 0x02
+
+/* sample frequency index */
+#define RT1318_SDCA_RATE_16000HZ		0x04
+#define RT1318_SDCA_RATE_32000HZ		0x07
+#define RT1318_SDCA_RATE_44100HZ		0x08
+#define RT1318_SDCA_RATE_48000HZ		0x09
+#define RT1318_SDCA_RATE_96000HZ		0x0b
+#define RT1318_SDCA_RATE_192000HZ		0x0d
+
+
+struct rt1318_sdw_priv {
+	struct snd_soc_component *component;
+	struct regmap *regmap;
+	struct sdw_slave *sdw_slave;
+	struct sdw_bus_params params;
+	bool hw_init;
+	bool first_hw_init;
+};
+
+#endif /* __RT1318_SDW_H__ */