From 6668ed271eaefaa63e686bdfbedaeb7b8e492722 Mon Sep 17 00:00:00 2001 From: Kumar Kartikeya Dwivedi Date: Fri, 4 Sep 2026 10:43:19 +0200 Subject: selftests/bpf: Reject graph kptr use after RCU unlock 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 Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com Signed-off-by: Alexei Starovoitov --- sound/soc/codecs/max9877.h | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 sound/soc/codecs/max9877.h (limited to 'sound/soc/codecs/max9877.h') diff --git a/sound/soc/codecs/max9877.h b/sound/soc/codecs/max9877.h new file mode 100644 index 000000000..3c2788175 --- /dev/null +++ b/sound/soc/codecs/max9877.h @@ -0,0 +1,30 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * max9877.h -- amp driver for max9877 + * + * Copyright (C) 2009 Samsung Electronics Co.Ltd + * Author: Joonyoung Shim + */ + +#ifndef _MAX9877_H +#define _MAX9877_H + +#define MAX9877_INPUT_MODE 0x00 +#define MAX9877_SPK_VOLUME 0x01 +#define MAX9877_HPL_VOLUME 0x02 +#define MAX9877_HPR_VOLUME 0x03 +#define MAX9877_OUTPUT_MODE 0x04 + +/* MAX9877_INPUT_MODE */ +#define MAX9877_INB (1 << 4) +#define MAX9877_INA (1 << 5) +#define MAX9877_ZCD (1 << 6) + +/* MAX9877_OUTPUT_MODE */ +#define MAX9877_OUTMODE_MASK (15 << 0) +#define MAX9877_OSC_MASK (3 << 4) +#define MAX9877_OSC_OFFSET 4 +#define MAX9877_BYPASS (1 << 6) +#define MAX9877_SHDN (1 << 7) + +#endif -- cgit v1.3.1