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.c | 128 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 128 insertions(+) create mode 100644 arch/mips/ath25/devices.c (limited to 'arch/mips/ath25/devices.c') diff --git a/arch/mips/ath25/devices.c b/arch/mips/ath25/devices.c new file mode 100644 index 000000000..301a90282 --- /dev/null +++ b/arch/mips/ath25/devices.c @@ -0,0 +1,128 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include + +#include +#include "devices.h" +#include "ar5312.h" +#include "ar2315.h" + +struct ar231x_board_config ath25_board; +enum ath25_soc_type ath25_soc = ATH25_SOC_UNKNOWN; + +static struct resource ath25_wmac0_res[] = { + { + .name = "wmac0_membase", + .flags = IORESOURCE_MEM, + }, + { + .name = "wmac0_irq", + .flags = IORESOURCE_IRQ, + } +}; + +static struct resource ath25_wmac1_res[] = { + { + .name = "wmac1_membase", + .flags = IORESOURCE_MEM, + }, + { + .name = "wmac1_irq", + .flags = IORESOURCE_IRQ, + } +}; + +static struct platform_device ath25_wmac[] = { + { + .id = 0, + .name = "ar231x-wmac", + .resource = ath25_wmac0_res, + .num_resources = ARRAY_SIZE(ath25_wmac0_res), + .dev.platform_data = &ath25_board, + }, + { + .id = 1, + .name = "ar231x-wmac", + .resource = ath25_wmac1_res, + .num_resources = ARRAY_SIZE(ath25_wmac1_res), + .dev.platform_data = &ath25_board, + }, +}; + +static const char * const soc_type_strings[] = { + [ATH25_SOC_AR5312] = "Atheros AR5312", + [ATH25_SOC_AR2312] = "Atheros AR2312", + [ATH25_SOC_AR2313] = "Atheros AR2313", + [ATH25_SOC_AR2315] = "Atheros AR2315", + [ATH25_SOC_AR2316] = "Atheros AR2316", + [ATH25_SOC_AR2317] = "Atheros AR2317", + [ATH25_SOC_AR2318] = "Atheros AR2318", + [ATH25_SOC_UNKNOWN] = "Atheros (unknown)", +}; + +const char *get_system_type(void) +{ + if ((ath25_soc >= ARRAY_SIZE(soc_type_strings)) || + !soc_type_strings[ath25_soc]) + return soc_type_strings[ATH25_SOC_UNKNOWN]; + return soc_type_strings[ath25_soc]; +} + +void __init ath25_serial_setup(u32 mapbase, int irq, unsigned int uartclk) +{ +#ifdef CONFIG_SERIAL_8250_CONSOLE + struct uart_port s; + + memset(&s, 0, sizeof(s)); + + s.flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_IOREMAP; + s.iotype = UPIO_MEM32; + s.irq = irq; + s.regshift = 2; + s.mapbase = mapbase; + s.uartclk = uartclk; + + early_serial_setup(&s); +#endif /* CONFIG_SERIAL_8250_CONSOLE */ +} + +int __init ath25_add_wmac(int nr, u32 base, int irq) +{ + struct resource *res; + + ath25_wmac[nr].dev.platform_data = &ath25_board; + res = &ath25_wmac[nr].resource[0]; + res->start = base; + res->end = base + 0x10000 - 1; + res++; + res->start = irq; + res->end = irq; + return platform_device_register(&ath25_wmac[nr]); +} + +static int __init ath25_register_devices(void) +{ + if (is_ar5312()) + ar5312_init_devices(); + else + ar2315_init_devices(); + + return 0; +} + +device_initcall(ath25_register_devices); + +static int __init ath25_arch_init(void) +{ + if (is_ar5312()) + ar5312_arch_init(); + else + ar2315_arch_init(); + + return 0; +} + +arch_initcall(ath25_arch_init); -- cgit v1.3.1