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/most/Kconfig | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 drivers/most/Kconfig (limited to 'drivers/most/Kconfig') diff --git a/drivers/most/Kconfig b/drivers/most/Kconfig new file mode 100644 index 000000000..69c9e728b --- /dev/null +++ b/drivers/most/Kconfig @@ -0,0 +1,45 @@ +# SPDX-License-Identifier: GPL-2.0 +menuconfig MOST + tristate "MOST (Media Oriented Systems Transport) support" + depends on HAS_DMA && CONFIGFS_FS + default n + help + Say Y here if you want to enable MOST support. + This driver needs at least one additional component to enable the + desired access from userspace (e.g. character devices) and one that + matches the network controller's hardware interface (e.g. USB). + + To compile this driver as a module, choose M here: the + module will be called most_core. + + If in doubt, say N here. + +if MOST +config MOST_USB_HDM + tristate "USB" + depends on USB + help + Say Y here if you want to connect via USB to network transceiver. + + To compile this driver as a module, choose M here: the + module will be called most_usb. + +config MOST_CDEV + tristate "Cdev" + + help + Say Y here if you want to commumicate via character devices. + + To compile this driver as a module, choose M here: the + module will be called most_cdev. + +config MOST_SND + tristate "Sound" + depends on SND + select SND_PCM + help + Say Y here if you want to commumicate via ALSA/sound devices. + + To compile this driver as a module, choose M here: the + module will be called most_sound. +endif -- cgit v1.3.1