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/netfs/Makefile | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 fs/netfs/Makefile (limited to 'fs/netfs/Makefile') diff --git a/fs/netfs/Makefile b/fs/netfs/Makefile new file mode 100644 index 000000000..b43188d64 --- /dev/null +++ b/fs/netfs/Makefile @@ -0,0 +1,36 @@ +# SPDX-License-Identifier: GPL-2.0 + +netfs-y := \ + buffered_read.o \ + buffered_write.o \ + direct_read.o \ + direct_write.o \ + iterator.o \ + locking.o \ + main.o \ + misc.o \ + objects.o \ + read_collect.o \ + read_pgpriv2.o \ + read_retry.o \ + read_single.o \ + rolling_buffer.o \ + write_collect.o \ + write_issue.o \ + write_retry.o + +netfs-$(CONFIG_NETFS_STATS) += stats.o + +netfs-$(CONFIG_FSCACHE) += \ + fscache_cache.o \ + fscache_cookie.o \ + fscache_io.o \ + fscache_main.o \ + fscache_volume.o + +ifeq ($(CONFIG_PROC_FS),y) +netfs-$(CONFIG_FSCACHE) += fscache_proc.o +endif +netfs-$(CONFIG_FSCACHE_STATS) += fscache_stats.o + +obj-$(CONFIG_NETFS_SUPPORT) += netfs.o -- cgit v1.3.1