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/arm64/mm/Makefile | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) create mode 100644 arch/arm64/mm/Makefile (limited to 'arch/arm64/mm/Makefile') diff --git a/arch/arm64/mm/Makefile b/arch/arm64/mm/Makefile new file mode 100644 index 000000000..c26489cf9 --- /dev/null +++ b/arch/arm64/mm/Makefile @@ -0,0 +1,18 @@ +# SPDX-License-Identifier: GPL-2.0 +obj-y := dma-mapping.o extable.o fault.o init.o \ + cache.o copypage.o flush.o \ + ioremap.o mmap.o pgd.o mem_encrypt.o mmu.o \ + context.o proc.o pageattr.o fixmap.o +obj-$(CONFIG_ARM64_CONTPTE) += contpte.o +obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o +obj-$(CONFIG_PTDUMP) += ptdump.o +obj-$(CONFIG_PTDUMP_DEBUGFS) += ptdump_debugfs.o +obj-$(CONFIG_TRANS_TABLE) += trans_pgd.o +obj-$(CONFIG_TRANS_TABLE) += trans_pgd-asm.o +obj-$(CONFIG_DEBUG_VIRTUAL) += physaddr.o +obj-$(CONFIG_ARM64_MTE) += mteswap.o +obj-$(CONFIG_ARM64_GCS) += gcs.o +KASAN_SANITIZE_physaddr.o += n + +obj-$(CONFIG_KASAN) += kasan_init.o +KASAN_SANITIZE_kasan_init.o := n -- cgit v1.3.1