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, 135 insertions, 0 deletions

diff --git a/sound/soc/codecs/es8316.h b/sound/soc/codecs/es8316.h
new file mode 100644
index 000000000..0ff16f948
--- /dev/null
+++ b/sound/soc/codecs/es8316.h
@@ -0,0 +1,135 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright Everest Semiconductor Co.,Ltd
+ *
+ * Author: David Yang <yangxiaohua@everest-semi.com>
+ */
+
+#ifndef _ES8316_H
+#define _ES8316_H
+
+/*
+ * ES8316 register space
+ */
+
+/* Reset Control */
+#define ES8316_RESET		0x00
+
+/* Clock Management */
+#define ES8316_CLKMGR_CLKSW	0x01
+#define ES8316_CLKMGR_CLKSEL	0x02
+#define ES8316_CLKMGR_ADCOSR	0x03
+#define ES8316_CLKMGR_ADCDIV1	0x04
+#define ES8316_CLKMGR_ADCDIV2	0x05
+#define ES8316_CLKMGR_DACDIV1	0x06
+#define ES8316_CLKMGR_DACDIV2	0x07
+#define ES8316_CLKMGR_CPDIV	0x08
+
+/* Serial Data Port Control */
+#define ES8316_SERDATA1		0x09
+#define ES8316_SERDATA_ADC	0x0a
+#define ES8316_SERDATA_DAC	0x0b
+
+/* System Control */
+#define ES8316_SYS_VMIDSEL	0x0c
+#define ES8316_SYS_PDN		0x0d
+#define ES8316_SYS_LP1		0x0e
+#define ES8316_SYS_LP2		0x0f
+#define ES8316_SYS_VMIDLOW	0x10
+#define ES8316_SYS_VSEL		0x11
+#define ES8316_SYS_REF		0x12
+
+/* Headphone Mixer */
+#define ES8316_HPMIX_SEL	0x13
+#define ES8316_HPMIX_SWITCH	0x14
+#define ES8316_HPMIX_PDN	0x15
+#define ES8316_HPMIX_VOL	0x16
+
+/* Charge Pump Headphone driver */
+#define ES8316_CPHP_OUTEN	0x17
+#define ES8316_CPHP_ICAL_VOL	0x18
+#define ES8316_CPHP_PDN1	0x19
+#define ES8316_CPHP_PDN2	0x1a
+#define ES8316_CPHP_LDOCTL	0x1b
+
+/* Calibration */
+#define ES8316_CAL_TYPE		0x1c
+#define ES8316_CAL_SET		0x1d
+#define ES8316_CAL_HPLIV	0x1e
+#define ES8316_CAL_HPRIV	0x1f
+#define ES8316_CAL_HPLMV	0x20
+#define ES8316_CAL_HPRMV	0x21
+
+/* ADC Control */
+#define ES8316_ADC_PDN_LINSEL	0x22
+#define ES8316_ADC_PGAGAIN	0x23
+#define ES8316_ADC_D2SEPGA	0x24
+#define ES8316_ADC_DMIC		0x25
+#define ES8316_ADC_MUTE		0x26
+#define ES8316_ADC_VOLUME	0x27
+#define ES8316_ADC_ALC1		0x29
+#define ES8316_ADC_ALC2		0x2a
+#define ES8316_ADC_ALC3		0x2b
+#define ES8316_ADC_ALC4		0x2c
+#define ES8316_ADC_ALC5		0x2d
+#define ES8316_ADC_ALC_NG	0x2e
+
+/* DAC Control */
+#define ES8316_DAC_PDN		0x2f
+#define ES8316_DAC_SET1		0x30
+#define ES8316_DAC_SET2		0x31
+#define ES8316_DAC_SET3		0x32
+#define ES8316_DAC_VOLL		0x33
+#define ES8316_DAC_VOLR		0x34
+
+/* GPIO */
+#define ES8316_GPIO_SEL		0x4d
+#define ES8316_GPIO_DEBOUNCE	0x4e
+#define ES8316_GPIO_FLAG	0x4f
+
+/* Test mode */
+#define ES8316_TESTMODE		0x50
+#define ES8316_TEST1		0x51
+#define ES8316_TEST2		0x52
+#define ES8316_TEST3		0x53
+
+/*
+ * Field definitions
+ */
+
+/* ES8316_RESET */
+#define ES8316_RESET_CSM_ON		0x80
+
+/* ES8316_CLKMGR_CLKSW */
+#define ES8316_CLKMGR_CLKSW_MCLK_ON	0x40
+#define ES8316_CLKMGR_CLKSW_BCLK_ON	0x20
+
+/* ES8316_SERDATA1 */
+#define ES8316_SERDATA1_MASTER		0x80
+#define ES8316_SERDATA1_BCLK_INV	0x20
+
+/* ES8316_SERDATA_ADC and _DAC */
+#define ES8316_SERDATA2_FMT_MASK	0x3
+#define ES8316_SERDATA2_FMT_I2S		0x00
+#define ES8316_SERDATA2_FMT_LEFTJ	0x01
+#define ES8316_SERDATA2_FMT_RIGHTJ	0x02
+#define ES8316_SERDATA2_FMT_PCM		0x03
+#define ES8316_SERDATA2_ADCLRP		0x20
+#define ES8316_SERDATA2_LEN_MASK	0x1c
+#define ES8316_SERDATA2_LEN_24		0x00
+#define ES8316_SERDATA2_LEN_20		0x04
+#define ES8316_SERDATA2_LEN_18		0x08
+#define ES8316_SERDATA2_LEN_16		0x0c
+#define ES8316_SERDATA2_LEN_32		0x10
+
+/* ES8316_GPIO_DEBOUNCE	*/
+#define ES8316_GPIO_ENABLE_INTERRUPT		0x02
+
+/* ES8316_GPIO_FLAG */
+#define ES8316_GPIO_FLAG_GM_NOT_SHORTED		0x02
+#define ES8316_GPIO_FLAG_HP_NOT_INSERTED	0x04
+
+/* ES8316_CLKMGR_CLKSW */
+#define ES8316_CLKMGR_CLKSW_MCLK_DIV	0x80
+
+#endif