From 6668ed271eaefaa63e686bdfbedaeb7b8e492722 Mon Sep 17 00:00:00 2001 From: Kumar Kartikeya Dwivedi Date: Fri, 4 Sep 2026 10:43:19 +0200 Subject: selftests/bpf: Reject graph kptr use after RCU unlock 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 Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com Signed-off-by: Alexei Starovoitov --- arch/arm/mach-imx/mx27.h | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 arch/arm/mach-imx/mx27.h (limited to 'arch/arm/mach-imx/mx27.h') diff --git a/arch/arm/mach-imx/mx27.h b/arch/arm/mach-imx/mx27.h new file mode 100644 index 000000000..241c04d70 --- /dev/null +++ b/arch/arm/mach-imx/mx27.h @@ -0,0 +1,25 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved. + * Copyright 2008 Juergen Beisert, kernel@pengutronix.de + * + * This contains i.MX27-specific hardware definitions. For those + * hardware pieces that are common between i.MX21 and i.MX27, have a + * look at mx2x.h. + */ + +#ifndef __MACH_MX27_H__ +#define __MACH_MX27_H__ + +#define MX27_AIPI_BASE_ADDR 0x10000000 +#define MX27_AIPI_SIZE SZ_1M + +#define MX27_SAHB1_BASE_ADDR 0x80000000 +#define MX27_SAHB1_SIZE SZ_1M + +#define MX27_X_MEMC_BASE_ADDR 0xd8000000 +#define MX27_X_MEMC_SIZE SZ_1M + +#define MX27_IO_P2V(x) IMX_IO_P2V(x) + +#endif /* ifndef __MACH_MX27_H__ */ -- cgit v1.3.1