From 33a154a96e71a34a1bcca9f40da343dbbf7b38b4 Mon Sep 17 00:00:00 2001 From: Alexei Starovoitov Date: Thu, 1 Oct 2026 14:52:55 +0000 Subject: selftests/bpf: Test packet range of pointers sharing an id Add tests where two packet pointers share an id and tightening one pointer's umax from its var_off would put it less than their constant distance from the other's umax: with an index & 0x38 capped at 50, the base pointer keeps umax 50, so the pointer 8 bytes further on must keep umax 58, even though its known bits allow at most 56. These refused a valid program or accepted an out-of-bounds access before the fix: - check the advanced copy, load through the base: valid, was refused; - check the base, load the byte at base + 1 through a copy advanced by 8: was accepted; - check base + 4, load 4 bytes at base + 2 through base + 8: reads two bytes past the checked range, was accepted; - the same as the second with data_meta pointers checked against data: was accepted. These pass with and without the fix and cover nearby paths: - subtract an unknown scalar from a checked pointer and load below it (the range is kept across a new id); - reach a load through two paths whose checks cover 8 and 7 bytes after the loaded pointer; the second path must not be pruned by the first; - spill a copy of a pointer, check the pointer, fill the copy and load one byte past the checked range: the load is refused, and the copy has the range of the check. Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20261001145255.855630-2-alexei.starovoitov@gmail.com Signed-off-by: Kumar Kartikeya Dwivedi --- scripts/Makefile.dtbinst | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 scripts/Makefile.dtbinst (limited to 'scripts/Makefile.dtbinst') diff --git a/scripts/Makefile.dtbinst b/scripts/Makefile.dtbinst new file mode 100644 index 000000000..9d920419a --- /dev/null +++ b/scripts/Makefile.dtbinst @@ -0,0 +1,43 @@ +# SPDX-License-Identifier: GPL-2.0 +# ========================================================================== +# Installing dtb files +# +# Installs all dtb files listed in $(dtb-y) either in the +# INSTALL_DTBS_PATH directory or the default location: +# +# $INSTALL_PATH/dtbs/$KERNELRELEASE +# ========================================================================== + +PHONY := __dtbs_install +__dtbs_install: + +include include/config/auto.conf +include $(srctree)/scripts/Kbuild.include + +dst := $(INSTALL_DTBS_PATH) + +quiet_cmd_dtb_install = INSTALL $@ + cmd_dtb_install = install -D -m 0644 $< $@ + +$(dst)/%: $(obj)/% + $(call cmd,dtb_install) + +dtbs := $(patsubst $(obj)/%,%,$(call read-file, $(obj)/dtbs-list)) + +ifdef CONFIG_ARCH_WANT_FLAT_DTB_INSTALL + +define gen_install_rules +$(dst)/%: $(obj)/$(1)% + $$(call cmd,dtb_install) +endef + +$(foreach d, $(sort $(dir $(dtbs))), $(eval $(call gen_install_rules,$(d)))) + +dtbs := $(notdir $(dtbs)) + +endif # CONFIG_ARCH_WANT_FLAT_DTB_INSTALL + +__dtbs_install: $(addprefix $(dst)/, $(dtbs)) + @: + +.PHONY: $(PHONY) -- cgit v1.3.1