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 --- rust/zerocopy/README.md | 13 +++++++++++++ 1 file changed, 13 insertions(+) create mode 100644 rust/zerocopy/README.md (limited to 'rust/zerocopy/README.md') diff --git a/rust/zerocopy/README.md b/rust/zerocopy/README.md new file mode 100644 index 000000000..3d11a6502 --- /dev/null +++ b/rust/zerocopy/README.md @@ -0,0 +1,13 @@ +# `zerocopy` + +These source files come from the Rust `zerocopy` crate, version v0.8.54 +(released 2026-07-08), hosted in the +repository, licensed under "BSD-2-Clause OR Apache-2.0 OR MIT" and only +modified to tweak the SPDX license identifiers. + +For copyright details, please see: + + https://github.com/google/zerocopy/blob/v0.8.54/README.md?plain=1 + https://github.com/google/zerocopy/blob/v0.8.54/LICENSE-BSD + https://github.com/google/zerocopy/blob/v0.8.54/LICENSE-APACHE + https://github.com/google/zerocopy/blob/v0.8.54/LICENSE-MIT -- cgit v1.3.1