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, 23 insertions, 0 deletions

diff --git a/drivers/video/Makefile b/drivers/video/Makefile
new file mode 100644
index 000000000..ffbac4387
--- /dev/null
+++ b/drivers/video/Makefile
@@ -0,0 +1,23 @@
+# SPDX-License-Identifier: GPL-2.0
+
+obj-$(CONFIG_APERTURE_HELPERS)    += aperture.o
+obj-$(CONFIG_SCREEN_INFO)         += screen_info.o
+obj-$(CONFIG_STI_CORE)            += sticore.o
+obj-$(CONFIG_VGASTATE)            += vgastate.o
+obj-$(CONFIG_VIDEO)               += cmdline.o nomodeset.o
+obj-$(CONFIG_HDMI)                += hdmi.o
+
+screen_info-y			  := screen_info_generic.o
+screen_info-$(CONFIG_PCI)         += screen_info_pci.o
+
+obj-$(CONFIG_VT)		  += console/
+obj-$(CONFIG_FB_STI)		  += console/
+obj-$(CONFIG_LOGO)		  += logo/
+obj-y				  += backlight/
+
+obj-y				  += fbdev/
+
+obj-$(CONFIG_VIDEOMODE_HELPERS) += display_timing.o videomode.o
+ifeq ($(CONFIG_OF),y)
+obj-$(CONFIG_VIDEOMODE_HELPERS) += of_display_timing.o of_videomode.o
+endif