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/resctrl/Kconfig | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 drivers/resctrl/Kconfig (limited to 'drivers/resctrl/Kconfig') diff --git a/drivers/resctrl/Kconfig b/drivers/resctrl/Kconfig new file mode 100644 index 000000000..672abea3b --- /dev/null +++ b/drivers/resctrl/Kconfig @@ -0,0 +1,31 @@ +menuconfig ARM64_MPAM_DRIVER + bool "MPAM driver" + depends on ARM64 && ARM64_MPAM + select ACPI_MPAM if ACPI + help + Memory System Resource Partitioning and Monitoring (MPAM) driver for + System IP, e.g. caches and memory controllers. + +if ARM64_MPAM_DRIVER + +config ARM64_MPAM_DRIVER_DEBUG + bool "Enable debug messages from the MPAM driver" + help + Say yes here to enable debug messages from the MPAM driver. + +config MPAM_KUNIT_TEST + bool "KUnit tests for MPAM driver " if !KUNIT_ALL_TESTS + depends on KUNIT=y + default KUNIT_ALL_TESTS + help + Enable this option to run tests in the MPAM driver. + + If unsure, say N. + +endif + +config ARM64_MPAM_RESCTRL_FS + bool + default y if ARM64_MPAM_DRIVER && RESCTRL_FS + select RESCTRL_RMID_DEPENDS_ON_CLOSID + select RESCTRL_ASSIGN_FIXED -- cgit v1.3.1