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/loongson32/Kconfig | 9 +++++++++ arch/mips/loongson32/Makefile | 1 + arch/mips/loongson32/Platform | 2 ++ 3 files changed, 12 insertions(+) create mode 100644 arch/mips/loongson32/Kconfig create mode 100644 arch/mips/loongson32/Makefile create mode 100644 arch/mips/loongson32/Platform (limited to 'arch/mips/loongson32') diff --git a/arch/mips/loongson32/Kconfig b/arch/mips/loongson32/Kconfig new file mode 100644 index 000000000..461d518b0 --- /dev/null +++ b/arch/mips/loongson32/Kconfig @@ -0,0 +1,9 @@ +# SPDX-License-Identifier: GPL-2.0 + +config BUILTIN_DTB_NAME + string "Source file for built-in DTB" + depends on BUILTIN_DTB + help + Base name (without suffix, relative to arch/mips/boot/dts/loongson) + for the DTS file that will be used to produce the DTB linked into + the kernel. diff --git a/arch/mips/loongson32/Makefile b/arch/mips/loongson32/Makefile new file mode 100644 index 000000000..a4e40e534 --- /dev/null +++ b/arch/mips/loongson32/Makefile @@ -0,0 +1 @@ +# SPDX-License-Identifier: GPL-2.0-only diff --git a/arch/mips/loongson32/Platform b/arch/mips/loongson32/Platform new file mode 100644 index 000000000..67fd07450 --- /dev/null +++ b/arch/mips/loongson32/Platform @@ -0,0 +1,2 @@ +cflags-$(CONFIG_CPU_LOONGSON32) += -march=mips32r2 -Wa,--trap +load-$(CONFIG_CPU_LOONGSON32) += 0xffffffff80200000 -- cgit v1.3.1