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, 63 insertions, 0 deletions

diff --git a/include/dt-bindings/clock/stm32fx-clock.h b/include/dt-bindings/clock/stm32fx-clock.h
new file mode 100644
index 000000000..b6ff9c68c
--- /dev/null
+++ b/include/dt-bindings/clock/stm32fx-clock.h
@@ -0,0 +1,63 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * stm32fx-clock.h
+ *
+ * Copyright (C) 2016 STMicroelectronics
+ * Author: Gabriel Fernandez for STMicroelectronics.
+ */
+
+/*
+ * List of clocks which are not derived from system clock (SYSCLOCK)
+ *
+ * The index of these clocks is the secondary index of DT bindings
+ * (see Documentation/devicetree/bindings/clock/st,stm32-rcc.yaml)
+ *
+ * e.g:
+	<assigned-clocks = <&rcc 1 CLK_LSE>;
+*/
+
+#ifndef _DT_BINDINGS_CLK_STMFX_H
+#define _DT_BINDINGS_CLK_STMFX_H
+
+#define SYSTICK			0
+#define FCLK			1
+#define CLK_LSI			2
+#define CLK_LSE			3
+#define CLK_HSE_RTC		4
+#define CLK_RTC			5
+#define PLL_VCO_I2S		6
+#define PLL_VCO_SAI		7
+#define CLK_LCD			8
+#define CLK_I2S			9
+#define CLK_SAI1		10
+#define CLK_SAI2		11
+#define CLK_I2SQ_PDIV		12
+#define CLK_SAIQ_PDIV		13
+#define CLK_HSI			14
+#define CLK_SYSCLK		15
+#define CLK_F469_DSI		16
+
+#define END_PRIMARY_CLK		17
+
+#define CLK_HDMI_CEC		16
+#define CLK_SPDIF		17
+#define CLK_USART1		18
+#define CLK_USART2		19
+#define CLK_USART3		20
+#define CLK_UART4		21
+#define CLK_UART5		22
+#define CLK_USART6		23
+#define CLK_UART7		24
+#define CLK_UART8		25
+#define CLK_I2C1		26
+#define CLK_I2C2		27
+#define CLK_I2C3		28
+#define CLK_I2C4		29
+#define CLK_LPTIMER		30
+#define CLK_PLL_SRC		31
+#define CLK_DFSDM1		32
+#define CLK_ADFSDM1		33
+#define CLK_F769_DSI		34
+#define END_PRIMARY_CLK_F7	35
+
+#endif