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/openvswitch/Kconfig | 77 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 77 insertions(+) create mode 100644 net/openvswitch/Kconfig (limited to 'net/openvswitch/Kconfig') diff --git a/net/openvswitch/Kconfig b/net/openvswitch/Kconfig new file mode 100644 index 000000000..e6aaee92d --- /dev/null +++ b/net/openvswitch/Kconfig @@ -0,0 +1,77 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Open vSwitch +# + +config OPENVSWITCH + tristate "Open vSwitch" + depends on INET + depends on !NF_CONNTRACK || \ + (NF_CONNTRACK && ((!NF_DEFRAG_IPV6 || NF_DEFRAG_IPV6) && \ + (!NF_NAT || NF_NAT) && \ + (!NETFILTER_CONNCOUNT || NETFILTER_CONNCOUNT))) + depends on PSAMPLE || !PSAMPLE + select MPLS + select NET_CRC32C + select NET_MPLS_GSO + select DST_CACHE + select NET_NSH + select NF_CONNTRACK_OVS if NF_CONNTRACK + select NF_NAT_OVS if NF_NAT + help + Open vSwitch is a multilayer Ethernet switch targeted at virtualized + environments. In addition to supporting a variety of features + expected in a traditional hardware switch, it enables fine-grained + programmatic extension and flow-based control of the network. This + control is useful in a wide variety of applications but is + particularly important in multi-server virtualization deployments, + which are often characterized by highly dynamic endpoints and the + need to maintain logical abstractions for multiple tenants. + + The Open vSwitch datapath provides an in-kernel fast path for packet + forwarding. It is complemented by a userspace daemon, ovs-vswitchd, + which is able to accept configuration from a variety of sources and + translate it into packet processing rules. + + See http://openvswitch.org for more information and userspace + utilities. + + To compile this code as a module, choose M here: the module will be + called openvswitch. + + If unsure, say N. + +config OPENVSWITCH_GRE + tristate "Open vSwitch GRE tunneling support" + depends on OPENVSWITCH + depends on NET_IPGRE + default OPENVSWITCH + help + If you say Y here, then the Open vSwitch will be able create GRE + vport. + + Say N to exclude this support and reduce the binary size. + + If unsure, say Y. + +config OPENVSWITCH_VXLAN + tristate "Open vSwitch VXLAN tunneling support" + depends on OPENVSWITCH + depends on VXLAN + default OPENVSWITCH + help + If you say Y here, then the Open vSwitch will be able create vxlan vport. + + Say N to exclude this support and reduce the binary size. + + If unsure, say Y. + +config OPENVSWITCH_GENEVE + tristate "Open vSwitch Geneve tunneling support" + depends on OPENVSWITCH + depends on GENEVE + default OPENVSWITCH + help + If you say Y here, then the Open vSwitch will be able create geneve vport. + + Say N to exclude this support and reduce the binary size. -- cgit v1.3.1