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 --- drivers/soc/imx/imx93-src.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 drivers/soc/imx/imx93-src.c (limited to 'drivers/soc/imx/imx93-src.c') diff --git a/drivers/soc/imx/imx93-src.c b/drivers/soc/imx/imx93-src.c new file mode 100644 index 000000000..f1c2e22d5 --- /dev/null +++ b/drivers/soc/imx/imx93-src.c @@ -0,0 +1,32 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2022 NXP + */ + +#include +#include +#include + +static int imx93_src_probe(struct platform_device *pdev) +{ + return devm_of_platform_populate(&pdev->dev); +} + +static const struct of_device_id imx93_src_ids[] = { + { .compatible = "fsl,imx93-src" }, + { } +}; +MODULE_DEVICE_TABLE(of, imx93_src_ids); + +static struct platform_driver imx93_src_driver = { + .driver = { + .name = "imx93_src", + .of_match_table = imx93_src_ids, + }, + .probe = imx93_src_probe, +}; +module_platform_driver(imx93_src_driver); + +MODULE_AUTHOR("Peng Fan "); +MODULE_DESCRIPTION("NXP i.MX93 src driver"); +MODULE_LICENSE("GPL"); -- cgit v1.3.1