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/misc/cb710/Kconfig | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 drivers/misc/cb710/Kconfig (limited to 'drivers/misc/cb710/Kconfig') diff --git a/drivers/misc/cb710/Kconfig b/drivers/misc/cb710/Kconfig new file mode 100644 index 000000000..a696d7509 --- /dev/null +++ b/drivers/misc/cb710/Kconfig @@ -0,0 +1,25 @@ +# SPDX-License-Identifier: GPL-2.0-only +config CB710_CORE + tristate "ENE CB710/720 Flash memory card reader support" + depends on PCI + help + This option enables support for PCI ENE CB710/720 Flash memory card + reader found in some laptops (ie. some versions of HP Compaq nx9500). + + You will also have to select some flash card format drivers (MMC/SD, + MemoryStick). + + This driver can also be built as a module. If so, the module + will be called cb710. + +config CB710_DEBUG + bool "Enable driver debugging" + depends on CB710_CORE != n + help + This is an option for use by developers; most people should + say N here. This adds a lot of debugging output to dmesg. + +config CB710_DEBUG_ASSUMPTIONS + bool + depends on CB710_CORE != n + default y -- cgit v1.3.1