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 --- scripts/package/debian/rules | 97 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 97 insertions(+) create mode 100755 scripts/package/debian/rules (limited to 'scripts/package/debian/rules') diff --git a/scripts/package/debian/rules b/scripts/package/debian/rules new file mode 100755 index 000000000..a417a7f8b --- /dev/null +++ b/scripts/package/debian/rules @@ -0,0 +1,97 @@ +#!/usr/bin/make -f +# SPDX-License-Identifier: GPL-2.0-only + +# in case debian/rules is executed directly +export DEB_RULES_REQUIRES_ROOT := no + +include debian/rules.vars + +ifneq (,$(filter-out parallel=1,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))) + NUMJOBS = $(patsubst parallel=%,%,$(filter parallel=%,$(DEB_BUILD_OPTIONS))) + MAKEFLAGS += -j$(NUMJOBS) +endif + +# When KBUILD_VERBOSE is undefined (presumably you are directly working with +# the debianized tree), show verbose logs unless DEB_BUILD_OPTION=terse is set. +ifeq ($(origin KBUILD_VERBOSE),undefined) + ifeq (,$(filter terse,$(DEB_BUILD_OPTIONS))) + export KBUILD_VERBOSE := 1 + else + Q := @ + endif +endif + +revision = $(shell dpkg-parsechangelog -S Version | sed -n 's/.*-//p') +CROSS_COMPILE ?= $(filter-out $(DEB_BUILD_GNU_TYPE)-, $(DEB_HOST_GNU_TYPE)-) +make-opts = ARCH=$(ARCH) KERNELRELEASE=$(KERNELRELEASE) \ + $(addprefix KBUILD_BUILD_VERSION=,$(revision)) \ + $(addprefix CROSS_COMPILE=,$(CROSS_COMPILE)) + +binary-targets := $(addprefix binary-, image image-dbg headers libc-dev) + +all-packages = $(shell dh_listpackages) +image-package = $(filter linux-image-% user-%, $(filter-out %-dbg, $(all-packages))) +image-dbg-package = $(filter %-dbg, $(all-packages)) +libc-dev-package = $(filter linux-libc-dev, $(all-packages)) +headers-package = $(filter linux-headers-%, $(all-packages)) + +mk-files = $(patsubst binary-%,debian/%.files,$1) +package = $($(@:binary-%=%-package)) + +# DH_OPTION is an environment variable common for all debhelper commands. +# We could 'export' it, but here it is passed from the command line to clarify +# which package is being processed in the build log. +DH_OPTIONS = -p$(package) + +# Note: future removal of KDEB_COMPRESS +# dpkg-deb >= 1.21.10 supports the DPKG_DEB_COMPRESSOR_TYPE environment +# variable, which provides the same functionality as KDEB_COMPRESS. The +# KDEB_COMPRESS variable will be removed in the future. +define binary + $(Q)dh_testdir $(DH_OPTIONS) + $(Q)dh_testroot $(DH_OPTIONS) + $(Q)dh_prep $(DH_OPTIONS) + $(Q)+$(MAKE) $(make-opts) run-command KBUILD_RUN_COMMAND='+$$(srctree)/scripts/package/builddeb $(package)' + $(Q)dh_installdocs $(DH_OPTIONS) + $(Q)dh_installchangelogs $(DH_OPTIONS) + $(Q)dh_compress $(DH_OPTIONS) + $(Q)dh_fixperms $(DH_OPTIONS) + $(Q)dh_gencontrol $(DH_OPTIONS) -- -f$(call mk-files,$@) + $(Q)dh_md5sums $(DH_OPTIONS) + $(Q)dh_builddeb $(DH_OPTIONS) -- $(addprefix -Z,$(KDEB_COMPRESS)) +endef + +.PHONY: $(binary-targets) +$(binary-targets): build-arch + $(Q)truncate -s0 $(call mk-files,$@) + $(if $(package),$(binary)) + +.PHONY: binary binary-indep binary-arch +binary: binary-arch binary-indep +binary-indep: build-indep +binary-arch: $(binary-targets) + $(Q)cat $(call mk-files,$^) > debian/files + +.PHONY: build build-indep build-arch +build: build-arch build-indep +build-indep: +build-arch: + $(Q)$(MAKE) $(make-opts) olddefconfig + $(Q)$(MAKE) $(make-opts) $(if $(filter um,$(ARCH)),,headers) all + +.PHONY: clean +clean: + $(Q)dh_clean + $(Q)rm -rf debian/deb-env.vars* debian/*.files + $(Q)$(MAKE) ARCH=$(ARCH) clean + +# If DEB_HOST_ARCH is empty, it is likely that debian/rules was executed +# directly. Run 'dpkg-architecture --print-set --print-format=make' to +# generate a makefile construct that exports all DEB_* variables. +ifndef DEB_HOST_ARCH +include debian/deb-env.vars + +debian/deb-env.vars: + $(Q)dpkg-architecture -a$$(cat debian/arch) --print-set --print-format=make > $@.tmp + $(Q)mv $@.tmp $@ +endif -- cgit v1.3.1