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/lpass-macro-common.c | 89 +++++++++++++++++++++++++++++++++++ 1 file changed, 89 insertions(+) create mode 100644 sound/soc/codecs/lpass-macro-common.c (limited to 'sound/soc/codecs/lpass-macro-common.c') diff --git a/sound/soc/codecs/lpass-macro-common.c b/sound/soc/codecs/lpass-macro-common.c new file mode 100644 index 000000000..7e59616ed --- /dev/null +++ b/sound/soc/codecs/lpass-macro-common.c @@ -0,0 +1,89 @@ +// SPDX-License-Identifier: GPL-2.0-only +// Copyright (c) 2022, The Linux Foundation. All rights reserved. + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "lpass-macro-common.h" + +static DEFINE_MUTEX(lpass_codec_mutex); +static enum lpass_codec_version lpass_codec_version; + +struct lpass_macro *lpass_macro_pds_init(struct device *dev) +{ + struct lpass_macro *l_pds; + int ret; + + if (!of_property_present(dev->of_node, "power-domains")) + return NULL; + + l_pds = devm_kzalloc(dev, sizeof(*l_pds), GFP_KERNEL); + if (!l_pds) + return ERR_PTR(-ENOMEM); + + l_pds->macro_pd = dev_pm_domain_attach_by_name(dev, "macro"); + if (IS_ERR_OR_NULL(l_pds->macro_pd)) { + ret = l_pds->macro_pd ? PTR_ERR(l_pds->macro_pd) : -ENODATA; + goto macro_err; + } + + ret = pm_runtime_resume_and_get(l_pds->macro_pd); + if (ret < 0) + goto macro_sync_err; + + l_pds->dcodec_pd = dev_pm_domain_attach_by_name(dev, "dcodec"); + if (IS_ERR_OR_NULL(l_pds->dcodec_pd)) { + ret = l_pds->dcodec_pd ? PTR_ERR(l_pds->dcodec_pd) : -ENODATA; + goto dcodec_err; + } + + ret = pm_runtime_resume_and_get(l_pds->dcodec_pd); + if (ret < 0) + goto dcodec_sync_err; + return l_pds; + +dcodec_sync_err: + dev_pm_domain_detach(l_pds->dcodec_pd, false); +dcodec_err: + pm_runtime_put(l_pds->macro_pd); +macro_sync_err: + dev_pm_domain_detach(l_pds->macro_pd, false); +macro_err: + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(lpass_macro_pds_init); + +void lpass_macro_pds_exit(struct lpass_macro *pds) +{ + if (pds) { + pm_runtime_put(pds->macro_pd); + dev_pm_domain_detach(pds->macro_pd, false); + pm_runtime_put(pds->dcodec_pd); + dev_pm_domain_detach(pds->dcodec_pd, false); + } +} +EXPORT_SYMBOL_GPL(lpass_macro_pds_exit); + +void lpass_macro_set_codec_version(enum lpass_codec_version version) +{ + guard(mutex)(&lpass_codec_mutex); + lpass_codec_version = version; +} +EXPORT_SYMBOL_GPL(lpass_macro_set_codec_version); + +enum lpass_codec_version lpass_macro_get_codec_version(void) +{ + guard(mutex)(&lpass_codec_mutex); + + return lpass_codec_version; +} +EXPORT_SYMBOL_GPL(lpass_macro_get_codec_version); + +MODULE_DESCRIPTION("Common macro driver"); +MODULE_LICENSE("GPL"); -- cgit v1.3.1