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, 39 insertions, 0 deletions

diff --git a/drivers/media/radio/Makefile b/drivers/media/radio/Makefile
new file mode 100644
index 000000000..f54693ebd
--- /dev/null
+++ b/drivers/media/radio/Makefile
@@ -0,0 +1,39 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the kernel character device drivers.
+#
+
+shark2-objs := radio-shark2.o radio-tea5777.o
+
+# Please keep it alphabetically sorted by Kconfig name
+# (e. g. LC_ALL=C sort Makefile)
+obj-$(CONFIG_RADIO_AZTECH) += radio-aztech.o
+obj-$(CONFIG_RADIO_CADET) += radio-cadet.o
+obj-$(CONFIG_RADIO_GEMTEK) += radio-gemtek.o
+obj-$(CONFIG_RADIO_ISA) += radio-isa.o
+obj-$(CONFIG_RADIO_MAXIRADIO) += radio-maxiradio.o
+obj-$(CONFIG_RADIO_MIROPCM20) += radio-miropcm20.o
+obj-$(CONFIG_RADIO_RTRACK2) += radio-rtrack2.o
+obj-$(CONFIG_RADIO_RTRACK) += radio-aimslab.o
+obj-$(CONFIG_RADIO_SAA7706H) += saa7706h.o
+obj-$(CONFIG_RADIO_SF16FMI) += radio-sf16fmi.o
+obj-$(CONFIG_RADIO_SF16FMR2) += radio-sf16fmr2.o
+obj-$(CONFIG_RADIO_SHARK2) += shark2.o
+obj-$(CONFIG_RADIO_SHARK) += radio-shark.o
+obj-$(CONFIG_RADIO_SI470X) += si470x/
+obj-$(CONFIG_RADIO_SI4713) += si4713/
+obj-$(CONFIG_RADIO_SI476X) += radio-si476x.o
+obj-$(CONFIG_RADIO_TEA575X) += tea575x.o
+obj-$(CONFIG_RADIO_TEA5764) += radio-tea5764.o
+obj-$(CONFIG_RADIO_TEF6862) += tef6862.o
+obj-$(CONFIG_RADIO_TERRATEC) += radio-terratec.o
+obj-$(CONFIG_RADIO_TIMBERDALE) += radio-timb.o
+obj-$(CONFIG_RADIO_TRUST) += radio-trust.o
+obj-$(CONFIG_RADIO_TYPHOON) += radio-typhoon.o
+obj-$(CONFIG_RADIO_ZOLTRIX) += radio-zoltrix.o
+
+obj-$(CONFIG_USB_DSBR) += dsbr100.o
+obj-$(CONFIG_USB_KEENE) += radio-keene.o
+obj-$(CONFIG_USB_MA901) += radio-ma901.o
+obj-$(CONFIG_USB_MR800) += radio-mr800.o
+obj-$(CONFIG_USB_RAREMONO) += radio-raremono.o