selftests/bpf: Reject graph kptr use after RCU unlockgrafted

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 <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 22 insertions, 0 deletions

diff --git a/fs/jffs2/Makefile b/fs/jffs2/Makefile
new file mode 100644
index 000000000..5294969d5
--- /dev/null
+++ b/fs/jffs2/Makefile
@@ -0,0 +1,22 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the Linux Journalling Flash File System v2 (JFFS2)
+#
+#
+
+obj-$(CONFIG_JFFS2_FS) += jffs2.o
+
+jffs2-y	:= compr.o dir.o file.o ioctl.o nodelist.o malloc.o
+jffs2-y	+= read.o nodemgmt.o readinode.o write.o scan.o gc.o
+jffs2-y	+= symlink.o build.o erase.o background.o fs.o writev.o
+jffs2-y	+= super.o debug.o
+
+jffs2-$(CONFIG_JFFS2_FS_WRITEBUFFER)	+= wbuf.o
+jffs2-$(CONFIG_JFFS2_FS_XATTR)		+= xattr.o xattr_trusted.o xattr_user.o
+jffs2-$(CONFIG_JFFS2_FS_SECURITY)	+= security.o
+jffs2-$(CONFIG_JFFS2_FS_POSIX_ACL)	+= acl.o
+jffs2-$(CONFIG_JFFS2_RUBIN)	+= compr_rubin.o
+jffs2-$(CONFIG_JFFS2_RTIME)	+= compr_rtime.o
+jffs2-$(CONFIG_JFFS2_ZLIB)	+= compr_zlib.o
+jffs2-$(CONFIG_JFFS2_LZO)	+= compr_lzo.o
+jffs2-$(CONFIG_JFFS2_SUMMARY)   += summary.o