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, 41 insertions, 0 deletions

diff --git a/arch/arm/mach-omap1/Makefile b/arch/arm/mach-omap1/Makefile
new file mode 100644
index 000000000..d9e251ea4
--- /dev/null
+++ b/arch/arm/mach-omap1/Makefile
@@ -0,0 +1,41 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the linux kernel.
+#
+
+# Common support
+obj-y := io.o id.o sram-init.o sram.o time.o irq.o mux.o flash.o \
+	 serial.o devices.o dma.o omap-dma.o fb.o
+obj-y += clock.o clock_data.o opp_data.o reset.o pm_bus.o timer.o
+
+ifneq ($(CONFIG_SND_SOC_OMAP_MCBSP),)
+obj-y += mcbsp.o
+endif
+
+obj-$(CONFIG_OMAP_32K_TIMER)	+= timer32k.o
+
+# OCPI interconnect support for 1710, 1610 and 5912
+obj-$(CONFIG_ARCH_OMAP16XX) += ocpi.o
+
+# Power Management
+obj-$(CONFIG_PM) += pm.o sleep.o
+
+i2c-omap-$(CONFIG_I2C_OMAP)		:= i2c.o
+obj-y					+= $(i2c-omap-m) $(i2c-omap-y)
+
+led-y := leds.o
+
+usb-fs-$(CONFIG_USB_SUPPORT)		:= usb.o
+obj-y					+= $(usb-fs-m) $(usb-fs-y)
+
+# Specific board support
+obj-$(CONFIG_MACH_OMAP_OSK)		+= board-osk.o
+obj-$(CONFIG_MACH_OMAP_PALMTE)		+= board-palmte.o
+obj-$(CONFIG_MACH_NOKIA770)		+= board-nokia770.o
+obj-$(CONFIG_MACH_AMS_DELTA)		+= board-ams-delta.o ams-delta-fiq.o \
+					   ams-delta-fiq-handler.o
+obj-$(CONFIG_MACH_SX1)			+= board-sx1.o board-sx1-mmc.o
+
+# GPIO
+obj-$(CONFIG_ARCH_OMAP15XX)		+= gpio15xx.o
+obj-$(CONFIG_ARCH_OMAP16XX)		+= gpio16xx.o