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/alchemy/Kconfig | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 arch/mips/alchemy/Kconfig (limited to 'arch/mips/alchemy/Kconfig') diff --git a/arch/mips/alchemy/Kconfig b/arch/mips/alchemy/Kconfig new file mode 100644 index 000000000..cf5ad52c0 --- /dev/null +++ b/arch/mips/alchemy/Kconfig @@ -0,0 +1,36 @@ +# SPDX-License-Identifier: GPL-2.0 +choice + prompt "Machine type" + depends on MIPS_ALCHEMY + default MIPS_DB1XXX + +config MIPS_MTX1 + bool "4G Systems MTX-1 board" + select HAVE_PCI + select SYS_SUPPORTS_LITTLE_ENDIAN + select SYS_HAS_EARLY_PRINTK + +config MIPS_DB1XXX + bool "Alchemy DB1XXX / PB1XXX boards" + select HAVE_PCI + select HAVE_PATA_PLATFORM + select SYS_SUPPORTS_LITTLE_ENDIAN + select SYS_HAS_EARLY_PRINTK + help + Select this option if you have one of the following Alchemy + development boards: DB1000 DB1500 DB1100 DB1550 DB1200 DB1300 + PB1500 PB1100 PB1550 PB1200 + Board type is autodetected during boot. + +config MIPS_XXS1500 + bool "MyCable XXS1500 board" + select SYS_SUPPORTS_LITTLE_ENDIAN + select SYS_HAS_EARLY_PRINTK + +config MIPS_GPR + bool "Trapeze ITS GPR board" + select HAVE_PCI + select SYS_SUPPORTS_LITTLE_ENDIAN + select SYS_HAS_EARLY_PRINTK + +endchoice -- cgit v1.3.1