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/acpi/numa/Kconfig | 15 +++++++++++++++ 1 file changed, 15 insertions(+) create mode 100644 drivers/acpi/numa/Kconfig (limited to 'drivers/acpi/numa/Kconfig') diff --git a/drivers/acpi/numa/Kconfig b/drivers/acpi/numa/Kconfig new file mode 100644 index 000000000..f33194d1e --- /dev/null +++ b/drivers/acpi/numa/Kconfig @@ -0,0 +1,15 @@ +# SPDX-License-Identifier: GPL-2.0 +config ACPI_NUMA + def_bool NUMA && !X86 + +config ACPI_HMAT + bool "ACPI Heterogeneous Memory Attribute Table Support" + depends on ACPI_NUMA + select HMEM_REPORTING + select MEMREGION + help + If set, this option has the kernel parse and report the + platform's ACPI HMAT (Heterogeneous Memory Attributes Table), + register memory initiators with their targets, and export + performance attributes through the node's sysfs device if + provided. -- cgit v1.3.1