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/powerpc/boot/install.sh | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100755 arch/powerpc/boot/install.sh (limited to 'arch/powerpc/boot/install.sh') diff --git a/arch/powerpc/boot/install.sh b/arch/powerpc/boot/install.sh new file mode 100755 index 000000000..c3df6c27c --- /dev/null +++ b/arch/powerpc/boot/install.sh @@ -0,0 +1,37 @@ +#!/bin/sh +# +# This file is subject to the terms and conditions of the GNU General Public +# License. See the file "COPYING" in the main directory of this archive +# for more details. +# +# Copyright (C) 1995 by Linus Torvalds +# +# Blatantly stolen from in arch/i386/boot/install.sh by Dave Hansen +# +# "make install" script for ppc64 architecture +# +# Arguments: +# $1 - kernel version +# $2 - kernel image file +# $3 - kernel map file +# $4 - default install path (blank if root directory) + +set -e + +# this should work for both the pSeries zImage and the iSeries vmlinux.sm +image_name=$(basename "$2") + + +echo "Warning: '${INSTALLKERNEL}' command not available... Copying" \ + "directly to $4/$image_name-$1" >&2 + +if [ -f "$4"/"$image_name"-"$1" ]; then + mv "$4"/"$image_name"-"$1" "$4"/"$image_name"-"$1".old +fi + +if [ -f "$4"/System.map-"$1" ]; then + mv "$4"/System.map-"$1" "$4"/System-"$1".old +fi + +cat "$2" > "$4"/"$image_name"-"$1" +cp "$3" "$4"/System.map-"$1" -- cgit v1.3.1