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/cachefiles/Makefile | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) create mode 100644 fs/cachefiles/Makefile (limited to 'fs/cachefiles/Makefile') diff --git a/fs/cachefiles/Makefile b/fs/cachefiles/Makefile new file mode 100644 index 000000000..16d811f1a --- /dev/null +++ b/fs/cachefiles/Makefile @@ -0,0 +1,20 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for caching in a mounted filesystem +# + +cachefiles-y := \ + cache.o \ + daemon.o \ + interface.o \ + io.o \ + key.o \ + main.o \ + namei.o \ + security.o \ + volume.o \ + xattr.o + +cachefiles-$(CONFIG_CACHEFILES_ERROR_INJECTION) += error_inject.o + +obj-$(CONFIG_CACHEFILES) := cachefiles.o -- cgit v1.3.1