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, 281 insertions, 0 deletions

diff --git a/drivers/clk/renesas/Kconfig b/drivers/clk/renesas/Kconfig
new file mode 100644
index 000000000..0203ecbb3
--- /dev/null
+++ b/drivers/clk/renesas/Kconfig
@@ -0,0 +1,281 @@
+# SPDX-License-Identifier: GPL-2.0
+
+config CLK_RENESAS
+	bool "Renesas SoC clock support" if COMPILE_TEST && !ARCH_RENESAS
+	default y if ARCH_RENESAS
+	select CLK_EMEV2 if ARCH_EMEV2
+	select CLK_RZA1 if ARCH_R7S72100
+	select CLK_R7S9210 if ARCH_R7S9210
+	select CLK_R8A73A4 if ARCH_R8A73A4
+	select CLK_R8A7740 if ARCH_R8A7740
+	select CLK_R8A7742 if ARCH_R8A7742
+	select CLK_R8A7743 if ARCH_R8A7743 || ARCH_R8A7744
+	select CLK_R8A7745 if ARCH_R8A7745
+	select CLK_R8A77470 if ARCH_R8A77470
+	select CLK_R8A774A1 if ARCH_R8A774A1
+	select CLK_R8A774B1 if ARCH_R8A774B1
+	select CLK_R8A774C0 if ARCH_R8A774C0
+	select CLK_R8A774E1 if ARCH_R8A774E1
+	select CLK_R8A7778 if ARCH_R8A7778
+	select CLK_R8A7779 if ARCH_R8A7779
+	select CLK_R8A7790 if ARCH_R8A7790
+	select CLK_R8A7791 if ARCH_R8A7791 || ARCH_R8A7793
+	select CLK_R8A7792 if ARCH_R8A7792
+	select CLK_R8A7794 if ARCH_R8A7794
+	select CLK_R8A7795 if ARCH_R8A77951
+	select CLK_R8A77960 if ARCH_R8A77960
+	select CLK_R8A77961 if ARCH_R8A77961
+	select CLK_R8A77965 if ARCH_R8A77965
+	select CLK_R8A77970 if ARCH_R8A77970
+	select CLK_R8A77980 if ARCH_R8A77980
+	select CLK_R8A77990 if ARCH_R8A77990
+	select CLK_R8A77995 if ARCH_R8A77995
+	select CLK_R8A779A0 if ARCH_R8A779A0
+	select CLK_R8A779F0 if ARCH_R8A779F0
+	select CLK_R8A779G0 if ARCH_R8A779G0
+	select CLK_R8A779H0 if ARCH_R8A779H0
+	select CLK_R9A06G032 if ARCH_R9A06G032
+	select CLK_R9A07G043 if ARCH_R9A07G043
+	select CLK_R9A07G044 if ARCH_R9A07G044
+	select CLK_R9A07G054 if ARCH_R9A07G054
+	select CLK_R9A08G045 if ARCH_R9A08G045
+	select CLK_R9A08G046 if ARCH_R9A08G046
+	select CLK_R9A09G011 if ARCH_R9A09G011
+	select CLK_R9A09G047 if ARCH_R9A09G047
+	select CLK_R9A09G056 if ARCH_R9A09G056
+	select CLK_R9A09G057 if ARCH_R9A09G057
+	select CLK_R9A09G077 if ARCH_R9A09G077
+	select CLK_R9A09G087 if ARCH_R9A09G087
+	select CLK_SH73A0 if ARCH_SH73A0
+
+if CLK_RENESAS
+
+# SoC
+config CLK_EMEV2
+	bool "Emma Mobile EV2 clock support" if COMPILE_TEST
+
+config CLK_RZA1
+	bool "RZ/A1H clock support" if COMPILE_TEST
+	select CLK_RENESAS_CPG_MSTP
+
+config CLK_R7S9210
+	bool "RZ/A2 clock support" if COMPILE_TEST
+	select CLK_RENESAS_CPG_MSSR
+
+config CLK_R8A73A4
+	bool "R-Mobile APE6 clock support" if COMPILE_TEST
+	select CLK_RENESAS_CPG_MSTP
+	select CLK_RENESAS_DIV6
+
+config CLK_R8A7740
+	bool "R-Mobile A1 clock support" if COMPILE_TEST
+	select CLK_RENESAS_CPG_MSTP
+	select CLK_RENESAS_DIV6
+
+config CLK_R8A7742
+	bool "RZ/G1H clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN2_CPG
+
+config CLK_R8A7743
+	bool "RZ/G1M clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN2_CPG
+
+config CLK_R8A7745
+	bool "RZ/G1E clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN2_CPG
+
+config CLK_R8A77470
+	bool "RZ/G1C clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN2_CPG
+
+config CLK_R8A774A1
+	bool "RZ/G2M clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN3_CPG
+
+config CLK_R8A774B1
+	bool "RZ/G2N clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN3_CPG
+
+config CLK_R8A774C0
+	bool "RZ/G2E clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN3_CPG
+
+config CLK_R8A774E1
+	bool "RZ/G2H clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN3_CPG
+
+config CLK_R8A7778
+	bool "R-Car M1A clock support" if COMPILE_TEST
+	select CLK_RENESAS_CPG_MSTP
+
+config CLK_R8A7779
+	bool "R-Car H1 clock support" if COMPILE_TEST
+	select CLK_RENESAS_CPG_MSTP
+
+config CLK_R8A7790
+	bool "R-Car H2 clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN2_CPG
+
+config CLK_R8A7791
+	bool "R-Car M2-W/N clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN2_CPG
+
+config CLK_R8A7792
+	bool "R-Car V2H clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN2_CPG
+
+config CLK_R8A7794
+	bool "R-Car E2 clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN2_CPG
+
+config CLK_R8A7795
+	bool "R-Car H3 clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN3_CPG
+
+config CLK_R8A77960
+	bool "R-Car M3-W clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN3_CPG
+
+config CLK_R8A77961
+	bool "R-Car M3-W+ clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN3_CPG
+
+config CLK_R8A77965
+	bool "R-Car M3-N clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN3_CPG
+
+config CLK_R8A77970
+	bool "R-Car V3M clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN3_CPG
+
+config CLK_R8A77980
+	bool "R-Car V3H clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN3_CPG
+
+config CLK_R8A77990
+	bool "R-Car E3 clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN3_CPG
+
+config CLK_R8A77995
+	bool "R-Car D3 clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN3_CPG
+
+config CLK_R8A779A0
+	bool "R-Car V3U clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN4_CPG
+
+config CLK_R8A779F0
+	bool "R-Car S4-8 clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN4_CPG
+
+config CLK_R8A779G0
+	bool "R-Car V4H clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN4_CPG
+
+config CLK_R8A779H0
+	bool "R-Car V4M clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN4_CPG
+
+config CLK_R9A06G032
+	bool "RZ/N1D clock support" if COMPILE_TEST
+
+config CLK_R9A07G043
+	bool "RZ/G2UL clock support" if COMPILE_TEST
+	select CLK_RZG2L
+
+config CLK_R9A07G044
+	bool "RZ/G2L clock support" if COMPILE_TEST
+	select CLK_RZG2L
+
+config CLK_R9A07G054
+	bool "RZ/V2L clock support" if COMPILE_TEST
+	select CLK_RZG2L
+
+config CLK_R9A08G045
+	bool "RZ/G3S clock support" if COMPILE_TEST
+	select CLK_RZG2L
+
+config CLK_R9A08G046
+	bool "RZ/G3L clock support" if COMPILE_TEST
+	select CLK_RZG2L
+
+config CLK_R9A09G011
+	bool "RZ/V2M clock support" if COMPILE_TEST
+	select CLK_RZG2L
+
+config CLK_R9A09G047
+       bool "RZ/G3E clock support" if COMPILE_TEST
+       select CLK_RZV2H
+
+config CLK_R9A09G056
+       bool "RZ/V2N clock support" if COMPILE_TEST
+       select CLK_RZV2H
+
+config CLK_R9A09G057
+       bool "RZ/V2H(P) clock support" if COMPILE_TEST
+       select CLK_RZV2H
+
+config CLK_R9A09G077
+	bool "RZ/T2H clock support" if COMPILE_TEST
+	select CLK_RENESAS_CPG_MSSR
+
+config CLK_R9A09G087
+	bool "RZ/N2H clock support" if COMPILE_TEST
+	select CLK_RENESAS_CPG_MSSR
+
+config CLK_SH73A0
+	bool "SH-Mobile AG5 clock support" if COMPILE_TEST
+	select CLK_RENESAS_CPG_MSTP
+	select CLK_RENESAS_DIV6
+
+
+# Family
+config CLK_RCAR_CPG_LIB
+	bool "CPG/MSSR library functions" if COMPILE_TEST
+
+config CLK_RCAR_GEN2_CPG
+	bool "R-Car Gen2 CPG clock support" if COMPILE_TEST
+	select CLK_RENESAS_CPG_MSSR
+
+config CLK_RCAR_GEN3_CPG
+	bool "R-Car Gen3 and RZ/G2 CPG clock support" if COMPILE_TEST
+	select CLK_RCAR_CPG_LIB
+	select CLK_RENESAS_CPG_MSSR
+
+config CLK_RCAR_GEN4_CPG
+	bool "R-Car Gen4 clock support" if COMPILE_TEST
+	select CLK_RCAR_CPG_LIB
+	select CLK_RENESAS_CPG_MSSR
+
+config CLK_RCAR_USB2_CLOCK_SEL
+	bool "R-Car USB2 clock selector support"
+	depends on ARCH_RENESAS || COMPILE_TEST
+	select RESET_CONTROLLER
+	help
+	  This is a driver for R-Car USB2 clock selector
+
+config CLK_RZG2L
+	bool "RZ/{G2{L,UL},G3{S,L},V2L} family clock support" if COMPILE_TEST
+	select RESET_CONTROLLER
+
+config CLK_RZV2H
+	bool "RZ/{G3E,V2H(P)} family clock support" if COMPILE_TEST
+	select RESET_CONTROLLER
+
+config CLK_RENESAS_VBATTB
+	tristate "Renesas VBATTB clock controller"
+	depends on ARCH_RZG2L || COMPILE_TEST
+	select RESET_CONTROLLER
+
+# Generic
+config CLK_RENESAS_CPG_MSSR
+	bool "CPG/MSSR clock support" if COMPILE_TEST
+	select CLK_RENESAS_DIV6
+
+config CLK_RENESAS_CPG_MSTP
+	bool "MSTP clock support" if COMPILE_TEST
+
+config CLK_RENESAS_DIV6
+	bool "DIV6 clock support" if COMPILE_TEST
+
+endif # CLK_RENESAS