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, 26 insertions, 0 deletions

diff --git a/drivers/media/spi/Kconfig b/drivers/media/spi/Kconfig
new file mode 100644
index 000000000..4656afae5
--- /dev/null
+++ b/drivers/media/spi/Kconfig
@@ -0,0 +1,26 @@
+# SPDX-License-Identifier: GPL-2.0-only
+if VIDEO_DEV && SPI
+
+comment "SPI I2C drivers auto-selected by 'Autoselect ancillary drivers'"
+	depends on MEDIA_HIDE_ANCILLARY_SUBDRV && SPI
+
+menu "Media SPI Adapters"
+
+config CXD2880_SPI_DRV
+	tristate "Sony CXD2880 SPI support"
+	depends on DVB_CORE && SPI
+	default m if !MEDIA_SUBDRV_AUTOSELECT
+	help
+	  Choose if you would like to have SPI interface support for Sony CXD2880.
+
+config VIDEO_GS1662
+	tristate "Gennum Serializers video"
+	depends on SPI && VIDEO_DEV
+	select MEDIA_CONTROLLER
+	select VIDEO_V4L2_SUBDEV_API
+	help
+	  Enable the GS1662 driver which serializes video streams.
+
+endmenu
+
+endif