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/mips/ath25/devices.h | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 arch/mips/ath25/devices.h (limited to 'arch/mips/ath25/devices.h') diff --git a/arch/mips/ath25/devices.h b/arch/mips/ath25/devices.h new file mode 100644 index 000000000..44cf69063 --- /dev/null +++ b/arch/mips/ath25/devices.h @@ -0,0 +1,44 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ATH25_DEVICES_H +#define __ATH25_DEVICES_H + +#include + +#define ATH25_REG_MS(_val, _field) (((_val) & _field##_M) >> _field##_S) + +#define ATH25_IRQ_CPU_CLOCK (MIPS_CPU_IRQ_BASE + 7) /* C0_CAUSE: 0x8000 */ + +enum ath25_soc_type { + /* handled by ar5312.c */ + ATH25_SOC_AR2312, + ATH25_SOC_AR2313, + ATH25_SOC_AR5312, + + /* handled by ar2315.c */ + ATH25_SOC_AR2315, + ATH25_SOC_AR2316, + ATH25_SOC_AR2317, + ATH25_SOC_AR2318, + + ATH25_SOC_UNKNOWN +}; + +extern enum ath25_soc_type ath25_soc; +extern struct ar231x_board_config ath25_board; +extern void (*ath25_irq_dispatch)(void); + +int ath25_find_config(phys_addr_t offset, unsigned long size); +void ath25_serial_setup(u32 mapbase, int irq, unsigned int uartclk); +int ath25_add_wmac(int nr, u32 base, int irq); + +static inline bool is_ar2315(void) +{ + return (current_cpu_data.cputype == CPU_4KEC); +} + +static inline bool is_ar5312(void) +{ + return !is_ar2315(); +} + +#endif -- cgit v1.3.1