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 --- net/llc/Makefile | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) create mode 100644 net/llc/Makefile (limited to 'net/llc/Makefile') diff --git a/net/llc/Makefile b/net/llc/Makefile new file mode 100644 index 000000000..46b1cd905 --- /dev/null +++ b/net/llc/Makefile @@ -0,0 +1,19 @@ +# SPDX-License-Identifier: GPL-2.0 +########################################################################### +# Makefile for the Linux 802.2 LLC (fully-functional) layer. +# +# Copyright (c) 1997 by Procom Technology,Inc. +# 2001-2003 by Arnaldo Carvalho de Melo +########################################################################### + +obj-$(CONFIG_LLC) += llc.o + +llc-y := llc_core.o llc_input.o llc_output.o + +obj-$(CONFIG_LLC2) += llc2.o + +llc2-y := llc_if.o llc_c_ev.o llc_c_ac.o llc_conn.o llc_c_st.o llc_pdu.o \ + llc_sap.o llc_s_ac.o llc_s_ev.o llc_s_st.o af_llc.o llc_station.o + +llc2-$(CONFIG_PROC_FS) += llc_proc.o +llc2-$(CONFIG_SYSCTL) += sysctl_net_llc.o -- cgit v1.3.1