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/mptcp/Makefile | 15 +++++++++++++++ 1 file changed, 15 insertions(+) create mode 100644 net/mptcp/Makefile (limited to 'net/mptcp/Makefile') diff --git a/net/mptcp/Makefile b/net/mptcp/Makefile new file mode 100644 index 000000000..89bf6c47c --- /dev/null +++ b/net/mptcp/Makefile @@ -0,0 +1,15 @@ +# SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_MPTCP) += mptcp.o + +mptcp-y := protocol.o subflow.o options.o token.o crypto.o ctrl.o pm.o diag.o \ + mib.o pm_netlink.o sockopt.o pm_userspace.o fastopen.o sched.o \ + mptcp_pm_gen.o pm_kernel.o + +obj-$(CONFIG_SYN_COOKIES) += syncookies.o +obj-$(CONFIG_INET_MPTCP_DIAG) += mptcp_diag.o + +mptcp_crypto_test-objs := crypto_test.o +mptcp_token_test-objs := token_test.o +obj-$(CONFIG_MPTCP_KUNIT_TEST) += mptcp_crypto_test.o mptcp_token_test.o + +obj-$(CONFIG_BPF_SYSCALL) += bpf.o -- cgit v1.3.1