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/rb532/setup.c | 81 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 81 insertions(+) create mode 100644 arch/mips/rb532/setup.c (limited to 'arch/mips/rb532/setup.c') diff --git a/arch/mips/rb532/setup.c b/arch/mips/rb532/setup.c new file mode 100644 index 000000000..51af9d374 --- /dev/null +++ b/arch/mips/rb532/setup.c @@ -0,0 +1,81 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * setup.c - boot time setup code + */ + +#include +#include + +#include +#include +#include +#include + +#include +#include + +struct pci_reg __iomem *pci_reg; +EXPORT_SYMBOL(pci_reg); + +static struct resource pci0_res[] = { + { + .name = "pci_reg0", + .start = PCI0_BASE_ADDR, + .end = PCI0_BASE_ADDR + sizeof(struct pci_reg), + .flags = IORESOURCE_MEM, + } +}; + +static void rb_machine_restart(char *command) +{ + /* just jump to the reset vector */ + writel(0x80000001, IDT434_REG_BASE + RST); + ((void (*)(void)) KSEG1ADDR(0x1FC00000u))(); +} + +static void rb_machine_halt(void) +{ + for (;;) + continue; +} + +void __init plat_mem_setup(void) +{ + u32 val; + + _machine_restart = rb_machine_restart; + _machine_halt = rb_machine_halt; + pm_power_off = rb_machine_halt; + + set_io_port_base(KSEG1); + + pci_reg = ioremap(pci0_res[0].start, + pci0_res[0].end - pci0_res[0].start); + if (!pci_reg) { + printk(KERN_ERR "Could not remap PCI registers\n"); + return; + } + + val = __raw_readl(&pci_reg->pcic); + val &= 0xFFFFFF7; + __raw_writel(val, (void *)&pci_reg->pcic); + +#ifdef CONFIG_PCI + /* Enable PCI interrupts in EPLD Mask register */ + *epld_mask = 0x0; + *(epld_mask + 1) = 0x0; +#endif + write_c0_wired(0); +} + +const char *get_system_type(void) +{ + switch (mips_machtype) { + case MACH_MIKROTIK_RB532A: + return "Mikrotik RB532A"; + break; + default: + return "Mikrotik RB532"; + break; + } +} -- cgit v1.3.1