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/net.h | 79 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 io_uring/net.h (limited to 'io_uring/net.h') diff --git a/io_uring/net.h b/io_uring/net.h new file mode 100644 index 000000000..51fda715d --- /dev/null +++ b/io_uring/net.h @@ -0,0 +1,79 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include +#include + +struct io_async_msghdr { +#if defined(CONFIG_NET) + struct iou_vec vec; + + struct_group(clear, + int namelen; + struct iovec fast_iov; + __kernel_size_t controllen; + __kernel_size_t payloadlen; + struct sockaddr __user *uaddr; + struct msghdr msg; + struct sockaddr_storage addr; + ); +#else + struct_group(clear); +#endif +}; + +#if defined(CONFIG_NET) + +int io_shutdown_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_shutdown(struct io_kiocb *req, unsigned int issue_flags); + +void io_sendmsg_recvmsg_cleanup(struct io_kiocb *req); +int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags); + +int io_send(struct io_kiocb *req, unsigned int issue_flags); + +int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags); +int io_recv(struct io_kiocb *req, unsigned int issue_flags); + +void io_sendrecv_fail(struct io_kiocb *req); + +int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_accept(struct io_kiocb *req, unsigned int issue_flags); + +int io_socket_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_socket(struct io_kiocb *req, unsigned int issue_flags); +void io_socket_bpf_populate(struct io_uring_bpf_ctx *bctx, struct io_kiocb *req); +void io_connect_bpf_populate(struct io_uring_bpf_ctx *bctx, struct io_kiocb *req); + +int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_connect(struct io_kiocb *req, unsigned int issue_flags); + +int io_sendmsg_zc(struct io_kiocb *req, unsigned int issue_flags); +int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +void io_send_zc_cleanup(struct io_kiocb *req); + +int io_bind_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_bind(struct io_kiocb *req, unsigned int issue_flags); + +int io_listen_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_listen(struct io_kiocb *req, unsigned int issue_flags); + +void io_netmsg_cache_free(const void *entry); +#else +static inline void io_netmsg_cache_free(const void *entry) +{ +} +static inline void io_socket_bpf_populate(struct io_uring_bpf_ctx *bctx, + struct io_kiocb *req) +{ +} + +static inline void io_connect_bpf_populate(struct io_uring_bpf_ctx *bctx, + struct io_kiocb *req) +{ +} + +#endif -- cgit v1.3.1