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/smc/Makefile | 9 +++++++++ 1 file changed, 9 insertions(+) create mode 100644 net/smc/Makefile (limited to 'net/smc/Makefile') diff --git a/net/smc/Makefile b/net/smc/Makefile new file mode 100644 index 000000000..5368634c5 --- /dev/null +++ b/net/smc/Makefile @@ -0,0 +1,9 @@ +# SPDX-License-Identifier: GPL-2.0-only +ccflags-y += -I$(src) +obj-$(CONFIG_SMC) += smc.o +obj-$(CONFIG_SMC_DIAG) += smc_diag.o +smc-y := af_smc.o smc_pnet.o smc_ib.o smc_clc.o smc_core.o smc_wr.o smc_llc.o +smc-y += smc_cdc.o smc_tx.o smc_rx.o smc_close.o smc_ism.o smc_netlink.o smc_stats.o +smc-y += smc_tracepoint.o smc_inet.o +smc-$(CONFIG_SYSCTL) += smc_sysctl.o +smc-$(CONFIG_SMC_HS_CTRL_BPF) += smc_hs_bpf.o -- cgit v1.3.1