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 --- drivers/char/Makefile | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 drivers/char/Makefile (limited to 'drivers/char/Makefile') diff --git a/drivers/char/Makefile b/drivers/char/Makefile new file mode 100644 index 000000000..a46d7bf7c --- /dev/null +++ b/drivers/char/Makefile @@ -0,0 +1,43 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for the kernel character device drivers. +# + +obj-y += mem.o random.o +obj-$(CONFIG_TTY_PRINTK) += ttyprintk.o +obj-y += misc.o +obj-$(CONFIG_TEST_MISC_MINOR) += misc_minor_kunit.o +obj-$(CONFIG_ATARI_DSP56K) += dsp56k.o +obj-$(CONFIG_VIRTIO_CONSOLE) += virtio_console.o +obj-$(CONFIG_UV_MMTIMER) += uv_mmtimer.o +obj-$(CONFIG_IBM_BSR) += bsr.o + +obj-$(CONFIG_PRINTER) += lp.o + +obj-$(CONFIG_APM_EMULATION) += apm-emulation.o + +obj-$(CONFIG_SONYPI) += sonypi.o +obj-$(CONFIG_HPET) += hpet.o +obj-$(CONFIG_XILINX_HWICAP) += xilinx_hwicap/ +obj-$(CONFIG_NVRAM) += nvram.o +obj-$(CONFIG_TOSHIBA) += toshiba.o +obj-$(CONFIG_DS1620) += ds1620.o +obj-$(CONFIG_HW_RANDOM) += hw_random/ +obj-$(CONFIG_PPDEV) += ppdev.o +obj-$(CONFIG_NWBUTTON) += nwbutton.o +obj-$(CONFIG_NWFLASH) += nwflash.o +obj-$(CONFIG_SCx200_GPIO) += scx200_gpio.o +obj-$(CONFIG_PC8736x_GPIO) += pc8736x_gpio.o +obj-$(CONFIG_NSC_GPIO) += nsc_gpio.o +obj-$(CONFIG_TELCLOCK) += tlclk.o + +obj-y += agp/ + +obj-$(CONFIG_HANGCHECK_TIMER) += hangcheck-timer.o +obj-$(CONFIG_TCG_TPM) += tpm/ + +obj-$(CONFIG_PS3_FLASH) += ps3flash.o + +obj-$(CONFIG_XILLYBUS_CLASS) += xillybus/ +obj-$(CONFIG_POWERNV_OP_PANEL) += powernv-op-panel.o +obj-$(CONFIG_ADI) += adi.o -- cgit v1.3.1