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/video/Kconfig | 95 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 95 insertions(+) create mode 100644 drivers/video/Kconfig (limited to 'drivers/video/Kconfig') diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig new file mode 100644 index 000000000..a7144d275 --- /dev/null +++ b/drivers/video/Kconfig @@ -0,0 +1,95 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Video configuration +# + +menu "Graphics support" + +config APERTURE_HELPERS + bool + help + Support tracking and hand-over of aperture ownership. Required + by graphics drivers for firmware-provided framebuffers. + +config SCREEN_INFO + bool + default n + +config STI_CORE + bool + depends on PARISC + help + STI refers to the HP "Standard Text Interface" which is a set of + BIOS routines contained in a ROM chip in HP PA-RISC based machines. + +config VIDEO + bool + default n + +source "drivers/auxdisplay/Kconfig" + +if HAS_IOMEM + +config HAVE_FB_ATMEL + bool + +source "drivers/char/agp/Kconfig" + +source "drivers/gpu/vga/Kconfig" + +source "drivers/gpu/Kconfig" +source "drivers/gpu/host1x/Kconfig" +source "drivers/gpu/ipu-v3/Kconfig" +source "drivers/gpu/nova-core/Kconfig" + +source "drivers/gpu/drm/Kconfig" + +menu "Frame buffer Devices" +source "drivers/video/fbdev/Kconfig" +endmenu + +source "drivers/video/backlight/Kconfig" + +config VGASTATE + tristate + default n + +config VIDEOMODE_HELPERS + bool + +config HDMI + bool + +endif # HAS_IOMEM + +config FIRMWARE_EDID + bool "Enable firmware EDID" + depends on EFI_GENERIC_STUB || X86 + help + This enables access to the EDID transferred from the firmware. + On EFI systems, the EDID comes from the same device as the + primary GOP. On x86 with BIOS, it comes from the VESA BIOS. + DRM display drivers will be able to export the information + to userspace. + + Also enable this if DDC/I2C transfers do not work for your driver + and if you are using nvidiafb, i810fb or savagefb. + + In general, choosing Y for this option is safe. If you + experience extremely long delays while booting before you get + something on your display, try setting this to N. Matrox cards in + combination with certain motherboards and monitors are known to + suffer from this problem. + +if VT + source "drivers/video/console/Kconfig" +endif + +if FB_CORE || SGI_NEWPORT_CONSOLE + source "drivers/video/logo/Kconfig" + +endif + +source "drivers/gpu/trace/Kconfig" + +endmenu -- cgit v1.3.1