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/base/init.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 drivers/base/init.c (limited to 'drivers/base/init.c') diff --git a/drivers/base/init.c b/drivers/base/init.c new file mode 100644 index 000000000..af8014416 --- /dev/null +++ b/drivers/base/init.c @@ -0,0 +1,44 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2002-3 Patrick Mochel + * Copyright (c) 2002-3 Open Source Development Labs + */ + +#include +#include +#include +#include +#include + +#include "base.h" + +/** + * driver_init - initialize driver model. + * + * Call the driver model init functions to initialize their + * subsystems. Called early from init/main.c. + */ +void __init driver_init(void) +{ + /* These are the core pieces */ + bdi_init(&noop_backing_dev_info); + devtmpfs_init(); + devices_init(); + buses_init(); + classes_init(); + firmware_init(); + hypervisor_init(); + + /* These are also core pieces, but must come after the + * core core pieces. + */ + faux_bus_init(); + of_core_init(); + software_node_init(); + platform_bus_init(); + auxiliary_bus_init(); + memory_dev_init(); + node_dev_init(); + cpu_dev_init(); + container_dev_init(); +} -- cgit v1.3.1