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 --- sound/drivers/Makefile | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 sound/drivers/Makefile (limited to 'sound/drivers/Makefile') diff --git a/sound/drivers/Makefile b/sound/drivers/Makefile new file mode 100644 index 000000000..a08bdd70e --- /dev/null +++ b/sound/drivers/Makefile @@ -0,0 +1,28 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for ALSA +# Copyright (c) 2001 by Jaroslav Kysela +# + +snd-dummy-y := dummy.o +snd-aloop-y := aloop.o +snd-mtpav-y := mtpav.o +snd-mts64-y := mts64.o +snd-pcmtest-y := pcmtest.o +snd-portman2x4-y := portman2x4.o +snd-serial-u16550-y := serial-u16550.o +snd-serial-generic-y := serial-generic.o +snd-virmidi-y := virmidi.o + +# Toplevel Module Dependency +obj-$(CONFIG_SND_DUMMY) += snd-dummy.o +obj-$(CONFIG_SND_ALOOP) += snd-aloop.o +obj-$(CONFIG_SND_VIRMIDI) += snd-virmidi.o +obj-$(CONFIG_SND_PCMTEST) += snd-pcmtest.o +obj-$(CONFIG_SND_SERIAL_U16550) += snd-serial-u16550.o +obj-$(CONFIG_SND_SERIAL_GENERIC) += snd-serial-generic.o +obj-$(CONFIG_SND_MTPAV) += snd-mtpav.o +obj-$(CONFIG_SND_MTS64) += snd-mts64.o +obj-$(CONFIG_SND_PORTMAN2X4) += snd-portman2x4.o + +obj-$(CONFIG_SND) += opl3/ opl4/ mpu401/ vx/ pcsp/ -- cgit v1.3.1