From 78004e9a87f240df03e2f73120d291763c32e0a7 Mon Sep 17 00:00:00 2001 From: Ali Ahmet Memis Date: Fri, 21 Aug 2026 01:45:27 +0000 Subject: openrisc: fix arbitrary kernel memory access via or1k_atomic syscall sys_or1k_atomic() (syscall 244 in the "or1k" ABI) takes two user pointers, v1 and v2, and swaps the words they point to in hand-written assembly. l.lwz r29,0(r4) l.lwz r27,0(r5) l.sw 0(r4),r27 l.sw 0(r5),r29 The pointers are not checked with access_ok(). The four memory accesses also have no exception table entries. A caller passes a kernel address as either pointer, and the syscall reads from and writes to it directly. This gives an unprivileged process a kernel read/write primitive. It overwrites kernel data such as the sys_call_table, gaining code execution in kernel context. Check both pointers before entering the critical section. Add fixups for the four memory accesses so faults on valid but unmapped user addresses return -EFAULT. [shorne@gmail.com: fix comment style] Fixes: 9d02a4283e9c ("OpenRISC: Boot code") Cc: stable@vger.kernel.org Signed-off-by: Ali Ahmet Memis Signed-off-by: Stafford Horne --- drivers/video/Makefile | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 drivers/video/Makefile (limited to 'drivers/video/Makefile') diff --git a/drivers/video/Makefile b/drivers/video/Makefile new file mode 100644 index 000000000..ffbac4387 --- /dev/null +++ b/drivers/video/Makefile @@ -0,0 +1,23 @@ +# SPDX-License-Identifier: GPL-2.0 + +obj-$(CONFIG_APERTURE_HELPERS) += aperture.o +obj-$(CONFIG_SCREEN_INFO) += screen_info.o +obj-$(CONFIG_STI_CORE) += sticore.o +obj-$(CONFIG_VGASTATE) += vgastate.o +obj-$(CONFIG_VIDEO) += cmdline.o nomodeset.o +obj-$(CONFIG_HDMI) += hdmi.o + +screen_info-y := screen_info_generic.o +screen_info-$(CONFIG_PCI) += screen_info_pci.o + +obj-$(CONFIG_VT) += console/ +obj-$(CONFIG_FB_STI) += console/ +obj-$(CONFIG_LOGO) += logo/ +obj-y += backlight/ + +obj-y += fbdev/ + +obj-$(CONFIG_VIDEOMODE_HELPERS) += display_timing.o videomode.o +ifeq ($(CONFIG_OF),y) +obj-$(CONFIG_VIDEOMODE_HELPERS) += of_display_timing.o of_videomode.o +endif -- cgit v1.3.1