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/mpls/Kconfig | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 net/mpls/Kconfig (limited to 'net/mpls/Kconfig') diff --git a/net/mpls/Kconfig b/net/mpls/Kconfig new file mode 100644 index 000000000..d672ab72a --- /dev/null +++ b/net/mpls/Kconfig @@ -0,0 +1,39 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# MPLS configuration +# + +menuconfig MPLS + bool "MultiProtocol Label Switching" + default n + help + MultiProtocol Label Switching routes packets through logical + circuits. Originally conceived as a way of routing packets at + hardware speeds (before hardware was capable of routing ipv4 packets), + MPLS remains a simple way of making tunnels. + + If you have not heard of MPLS you probably want to say N here. + +if MPLS + +config NET_MPLS_GSO + tristate "MPLS: GSO support" + help + This is helper module to allow segmentation of non-MPLS GSO packets + that have had MPLS stack entries pushed onto them and thus + become MPLS GSO packets. + +config MPLS_ROUTING + tristate "MPLS: routing support" + depends on NET_IP_TUNNEL || NET_IP_TUNNEL=n + depends on PROC_SYSCTL + help + Add support for forwarding of mpls packets. + +config MPLS_IPTUNNEL + tristate "MPLS: IP over MPLS tunnel support" + depends on LWTUNNEL && MPLS_ROUTING + help + mpls ip tunnel support. + +endif # MPLS -- cgit v1.3.1