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, 35 insertions, 0 deletions

diff --git a/sound/pci/echoaudio/Makefile b/sound/pci/echoaudio/Makefile
new file mode 100644
index 000000000..96667641c
--- /dev/null
+++ b/sound/pci/echoaudio/Makefile
@@ -0,0 +1,35 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for ALSA Echoaudio soundcard drivers
+# Copyright (c) 2003 by Giuliano Pochini <pochini@shiny.it>
+#
+
+snd-darla20-y := darla20.o
+snd-gina20-y := gina20.o
+snd-layla20-y := layla20.o
+snd-darla24-y := darla24.o
+snd-gina24-y := gina24.o
+snd-layla24-y := layla24.o
+snd-mona-y := mona.o
+snd-mia-y := mia.o
+snd-echo3g-y := echo3g.o
+snd-indigo-y := indigo.o
+snd-indigoio-y := indigoio.o
+snd-indigodj-y := indigodj.o
+snd-indigoiox-y := indigoiox.o
+snd-indigodjx-y := indigodjx.o
+
+obj-$(CONFIG_SND_DARLA20) += snd-darla20.o
+obj-$(CONFIG_SND_GINA20) += snd-gina20.o
+obj-$(CONFIG_SND_LAYLA20) += snd-layla20.o
+obj-$(CONFIG_SND_DARLA24) += snd-darla24.o
+obj-$(CONFIG_SND_GINA24) += snd-gina24.o
+obj-$(CONFIG_SND_LAYLA24) += snd-layla24.o
+obj-$(CONFIG_SND_MONA) += snd-mona.o
+obj-$(CONFIG_SND_MIA) += snd-mia.o
+obj-$(CONFIG_SND_ECHO3G) += snd-echo3g.o
+obj-$(CONFIG_SND_INDIGO) += snd-indigo.o
+obj-$(CONFIG_SND_INDIGOIO) += snd-indigoio.o
+obj-$(CONFIG_SND_INDIGODJ) += snd-indigodj.o
+obj-$(CONFIG_SND_INDIGOIOX) += snd-indigoiox.o
+obj-$(CONFIG_SND_INDIGODJX) += snd-indigodjx.o