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, 48 insertions, 0 deletions

diff --git a/drivers/media/tuners/Makefile b/drivers/media/tuners/Makefile
new file mode 100644
index 000000000..bd350a285
--- /dev/null
+++ b/drivers/media/tuners/Makefile
@@ -0,0 +1,48 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for common V4L/DVB tuners
+#
+
+ccflags-y += -I$(srctree)/drivers/media/dvb-frontends
+tda18271-objs := tda18271-maps.o tda18271-common.o tda18271-fe.o
+
+# Please keep it alphabetically sorted by Kconfig name
+# (e. g. LC_ALL=C sort Makefile)
+obj-$(CONFIG_MEDIA_TUNER_E4000) += e4000.o
+obj-$(CONFIG_MEDIA_TUNER_FC0011) += fc0011.o
+obj-$(CONFIG_MEDIA_TUNER_FC0012) += fc0012.o
+obj-$(CONFIG_MEDIA_TUNER_FC0013) += fc0013.o
+obj-$(CONFIG_MEDIA_TUNER_FC2580) += fc2580.o
+obj-$(CONFIG_MEDIA_TUNER_IT913X) += it913x.o
+obj-$(CONFIG_MEDIA_TUNER_M88RS6000T) += m88rs6000t.o
+obj-$(CONFIG_MEDIA_TUNER_MAX2165) += max2165.o
+obj-$(CONFIG_MEDIA_TUNER_MC44S803) += mc44s803.o
+obj-$(CONFIG_MEDIA_TUNER_MSI001) += msi001.o
+obj-$(CONFIG_MEDIA_TUNER_MT2060) += mt2060.o
+obj-$(CONFIG_MEDIA_TUNER_MT2063) += mt2063.o
+obj-$(CONFIG_MEDIA_TUNER_MT20XX) += mt20xx.o
+obj-$(CONFIG_MEDIA_TUNER_MT2131) += mt2131.o
+obj-$(CONFIG_MEDIA_TUNER_MT2266) += mt2266.o
+obj-$(CONFIG_MEDIA_TUNER_MXL301RF) += mxl301rf.o
+obj-$(CONFIG_MEDIA_TUNER_MXL5005S) += mxl5005s.o
+obj-$(CONFIG_MEDIA_TUNER_MXL5007T) += mxl5007t.o
+obj-$(CONFIG_MEDIA_TUNER_QM1D1B0004) += qm1d1b0004.o
+obj-$(CONFIG_MEDIA_TUNER_QM1D1C0042) += qm1d1c0042.o
+obj-$(CONFIG_MEDIA_TUNER_QT1010) += qt1010.o
+obj-$(CONFIG_MEDIA_TUNER_R820T) += r820t.o
+obj-$(CONFIG_MEDIA_TUNER_SI2157) += si2157.o
+obj-$(CONFIG_MEDIA_TUNER_SIMPLE) += tuner-simple.o
+obj-$(CONFIG_MEDIA_TUNER_SIMPLE) += tuner-types.o
+obj-$(CONFIG_MEDIA_TUNER_TDA18212) += tda18212.o
+obj-$(CONFIG_MEDIA_TUNER_TDA18218) += tda18218.o
+obj-$(CONFIG_MEDIA_TUNER_TDA18250) += tda18250.o
+obj-$(CONFIG_MEDIA_TUNER_TDA18271) += tda18271.o
+obj-$(CONFIG_MEDIA_TUNER_TDA827X) += tda827x.o
+obj-$(CONFIG_MEDIA_TUNER_TDA8290) += tda8290.o
+obj-$(CONFIG_MEDIA_TUNER_TDA9887) += tda9887.o
+obj-$(CONFIG_MEDIA_TUNER_TEA5761) += tea5761.o
+obj-$(CONFIG_MEDIA_TUNER_TEA5767) += tea5767.o
+obj-$(CONFIG_MEDIA_TUNER_TUA9001) += tua9001.o
+obj-$(CONFIG_MEDIA_TUNER_XC2028) += xc2028.o
+obj-$(CONFIG_MEDIA_TUNER_XC4000) += xc4000.o
+obj-$(CONFIG_MEDIA_TUNER_XC5000) += xc5000.o