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 --- io_uring/Makefile | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 io_uring/Makefile (limited to 'io_uring/Makefile') diff --git a/io_uring/Makefile b/io_uring/Makefile new file mode 100644 index 000000000..c54e328d1 --- /dev/null +++ b/io_uring/Makefile @@ -0,0 +1,28 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for io_uring + +ifdef CONFIG_GCOV_PROFILE_URING +GCOV_PROFILE := y +endif + +obj-$(CONFIG_IO_URING) += io_uring.o opdef.o kbuf.o rsrc.o notif.o \ + tctx.o filetable.o rw.o poll.o \ + tw.o wait.o eventfd.o uring_cmd.o \ + openclose.o sqpoll.o xattr.o nop.o \ + fs.o splice.o sync.o msg_ring.o \ + advise.o openclose.o statx.o timeout.o \ + cancel.o waitid.o register.o \ + truncate.o memmap.o alloc_cache.o \ + query.o loop.o + +obj-$(CONFIG_IO_URING_ZCRX) += zcrx.o +obj-$(CONFIG_IO_WQ) += io-wq.o +obj-$(CONFIG_FUTEX) += futex.o +obj-$(CONFIG_EPOLL) += epoll.o +obj-$(CONFIG_NET_RX_BUSY_POLL) += napi.o +obj-$(CONFIG_NET) += net.o cmd_net.o +obj-$(CONFIG_PROC_FS) += fdinfo.o +obj-$(CONFIG_IO_URING_MOCK_FILE) += mock_file.o +obj-$(CONFIG_IO_URING_BPF) += bpf_filter.o +obj-$(CONFIG_IO_URING_BPF_OPS) += bpf-ops.o -- cgit v1.3.1