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 --- fs/udf/Kconfig | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) create mode 100644 fs/udf/Kconfig (limited to 'fs/udf/Kconfig') diff --git a/fs/udf/Kconfig b/fs/udf/Kconfig new file mode 100644 index 000000000..8f7ce30d4 --- /dev/null +++ b/fs/udf/Kconfig @@ -0,0 +1,19 @@ +# SPDX-License-Identifier: GPL-2.0-only +config UDF_FS + tristate "UDF file system support" + select BUFFER_HEAD + select CRC_ITU_T + select NLS + select LEGACY_DIRECT_IO + help + This is a file system used on some CD-ROMs and DVDs. Since the + file system is supported by multiple operating systems and is more + compatible with standard unix file systems, it is also suitable for + removable USB disks. Say Y if you intend to mount DVD discs or CDRW's + written in packet mode, or if you want to use UDF for removable USB + disks. Please read . + + To compile this file system support as a module, choose M here: the + module will be called udf. + + If unsure, say N. -- cgit v1.3.1