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 --- tools/perf/tests/perf-targz-src-pkg | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100755 tools/perf/tests/perf-targz-src-pkg (limited to 'tools/perf/tests/perf-targz-src-pkg') diff --git a/tools/perf/tests/perf-targz-src-pkg b/tools/perf/tests/perf-targz-src-pkg new file mode 100755 index 000000000..52a90e6bd --- /dev/null +++ b/tools/perf/tests/perf-targz-src-pkg @@ -0,0 +1,23 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 +# Test one of the main kernel Makefile targets to generate a perf sources tarball +# suitable for build outside the full kernel sources. +# +# This is to test that the tools/perf/MANIFEST file lists all the files needed to +# be in such tarball, which sometimes gets broken when we move files around, +# like when we made some files that were in tools/perf/ available to other tools/ +# codebases by moving it to tools/include/, etc. +set -e + +PERF=$1 +cd ${PERF}/../.. +make perf-targz-src-pkg +TARBALL=$(ls -rt perf-*.tar.gz) +TMP_DEST=$(mktemp -d) +tar xf ${TARBALL} -C $TMP_DEST +rm -f ${TARBALL} +cd - > /dev/null +make -C $TMP_DEST/perf*/tools/perf +RC=$? +rm -rf ${TMP_DEST} +exit $RC -- cgit v1.3.1