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, 20 insertions, 0 deletions

diff --git a/drivers/soc/renesas/Makefile b/drivers/soc/renesas/Makefile
new file mode 100644
index 000000000..81bde85c2
--- /dev/null
+++ b/drivers/soc/renesas/Makefile
@@ -0,0 +1,20 @@
+# SPDX-License-Identifier: GPL-2.0
+# Generic, must be first because of soc_device_register()
+obj-$(CONFIG_SOC_RENESAS)	+= renesas-soc.o
+
+# SoC
+ifdef CONFIG_SMP
+obj-$(CONFIG_ARCH_R9A06G032)	+= r9a06g032-smp.o
+endif
+obj-$(CONFIG_SYSC_R9A08G045)	+= r9a08g045-sysc.o
+obj-$(CONFIG_SYSC_R9A08G046)	+= r9a08g046-sysc.o
+obj-$(CONFIG_SYS_R9A09G047)	+= r9a09g047-sys.o
+obj-$(CONFIG_SYS_R9A09G056)	+= r9a09g056-sys.o
+obj-$(CONFIG_SYS_R9A09G057)	+= r9a09g057-sys.o
+
+# Family
+obj-$(CONFIG_PWC_RZV2M)		+= pwc-rzv2m.o
+obj-$(CONFIG_RCAR_MFIS)		+= rcar-mfis.o
+obj-$(CONFIG_RST_RCAR)		+= rcar-rst.o
+obj-$(CONFIG_RZN1_IRQMUX)	+= rzn1_irqmux.o
+obj-$(CONFIG_SYSC_RZ)		+= rz-sysc.o