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, 52 insertions, 0 deletions

diff --git a/arch/mips/pci/Makefile b/arch/mips/pci/Makefile
new file mode 100644
index 000000000..a6e9785b5
--- /dev/null
+++ b/arch/mips/pci/Makefile
@@ -0,0 +1,52 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the PCI specific kernel interface routines under Linux.
+#
+
+obj-y				+= pci.o
+obj-$(CONFIG_PCI_DRIVERS_LEGACY)+= pci-legacy.o
+obj-$(CONFIG_PCI_DRIVERS_GENERIC)+= pci-generic.o
+
+#
+# PCI bus host bridge specific code
+#
+obj-$(CONFIG_MIPS_BONITO64)	+= ops-bonito64.o
+obj-$(CONFIG_PCI_GT64XXX_PCI0)	+= ops-gt64xxx_pci0.o
+obj-$(CONFIG_MIPS_MSC)		+= ops-msc.o
+obj-$(CONFIG_PCI_TX4927)	+= ops-tx4927.o
+obj-$(CONFIG_BCM47XX)		+= pci-bcm47xx.o
+obj-$(CONFIG_BCM63XX)		+= pci-bcm63xx.o fixup-bcm63xx.o \
+					ops-bcm63xx.o
+obj-$(CONFIG_MIPS_ALCHEMY)	+= pci-alchemy.o
+obj-$(CONFIG_PCI_AR2315)	+= pci-ar2315.o
+obj-$(CONFIG_SOC_AR71XX)	+= pci-ar71xx.o
+obj-$(CONFIG_PCI_AR724X)	+= pci-ar724x.o
+obj-$(CONFIG_PCI_XTALK_BRIDGE)	+= pci-xtalk-bridge.o
+#
+# These are still pretty much in the old state, watch, go blind.
+#
+obj-$(CONFIG_ATH79)		+= fixup-ath79.o
+obj-$(CONFIG_MIPS_COBALT)	+= fixup-cobalt.o
+obj-$(CONFIG_LEMOTE_FULOONG2E)	+= fixup-fuloong2e.o ops-loongson2.o
+obj-$(CONFIG_LEMOTE_MACH2F)	+= fixup-lemote2f.o ops-loongson2.o
+obj-$(CONFIG_MIPS_MALTA)	+= fixup-malta.o pci-malta.o
+obj-$(CONFIG_SGI_IP27)		+= pci-ip27.o
+obj-$(CONFIG_SGI_IP32)		+= fixup-ip32.o ops-mace.o pci-ip32.o
+obj-$(CONFIG_SIBYTE_SB1250)	+= fixup-sb1250.o pci-sb1250.o
+obj-$(CONFIG_SIBYTE_BCM112X)	+= fixup-sb1250.o pci-sb1250.o
+obj-$(CONFIG_SIBYTE_BCM1x80)	+= pci-bcm1480.o pci-bcm1480ht.o
+obj-$(CONFIG_SNI_RM)		+= fixup-sni.o ops-sni.o
+obj-$(CONFIG_LANTIQ)		+= fixup-lantiq.o
+obj-$(CONFIG_PCI_LANTIQ)	+= pci-lantiq.o ops-lantiq.o
+obj-$(CONFIG_SOC_MT7620)	+= pci-mt7620.o
+obj-$(CONFIG_SOC_RT288X)	+= pci-rt2880.o
+obj-$(CONFIG_SOC_RT3883)	+= pci-rt3883.o
+obj-$(CONFIG_SOC_TX4927)	+= pci-tx4927.o
+obj-$(CONFIG_SOC_TX4938)	+= pci-tx4938.o
+obj-$(CONFIG_TOSHIBA_RBTX4927)	+= fixup-rbtx4927.o
+obj-$(CONFIG_MIKROTIK_RB532)	+= pci-rc32434.o ops-rc32434.o fixup-rc32434.o
+obj-$(CONFIG_CAVIUM_OCTEON_SOC) += pci-octeon.o pcie-octeon.o
+
+ifdef CONFIG_PCI_MSI
+obj-$(CONFIG_CAVIUM_OCTEON_SOC) += msi-octeon.o
+endif