[PATCH 5.7 027/112] io_uring: fix {SQ,IO}POLL with unsupported opcodes

Greg Kroah-Hartman
2020-07-07T15:24:49Z

From: Pavel Begunkov <asml.silence@gmail.com>

[ Upstream commit 3232dd02af65f2d01be641120d2a710176b0c7a7 ]

IORING_SETUP_IOPOLL is defined only for read/write, other opcodes should
be disallowed, otherwise it'll get an error as below. Also refuse
open/close with SQPOLL, as the polling thread wouldn't know which file
table to use.

RIP: 0010:io_iopoll_getevents+0x111/0x5a0
Call Trace:
? _raw_spin_unlock_irqrestore+0x24/0x40
? do_send_sig_info+0x64/0x90
io_iopoll_reap_events.part.0+0x5e/0xa0
io_ring_ctx_wait_and_kill+0x132/0x1c0
io_uring_release+0x20/0x30
__fput+0xcd/0x230
____fput+0xe/0x10
task_work_run+0x67/0xa0
do_exit+0x353/0xb10
? handle_mm_fault+0xd4/0x200
? syscall_trace_enter+0x18c/0x2c0
do_group_exit+0x43/0xa0
__x64_sys_exit_group+0x18/0x20
do_syscall_64+0x60/0x1e0
entry_SYSCALL_64_after_hwframe+0x44/0xa9

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
[axboe: allow provide/remove buffers and files update]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/io_uring.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 4ab1728de247c..bb74e45941af2 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2748,6 +2748,8 @@ static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)

if (req->flags & REQ_F_NEED_CLEANUP)
return 0;
+ if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
+ return -EINVAL;

sp->file_in = NULL;
sp->off_in = READ_ONCE(sqe->splice_off_in);
@@ -2910,6 +2912,8 @@ static int io_fallocate_prep(struct io_kiocb *req,
{
if (sqe->ioprio || sqe->buf_index || sqe->rw_flags)
return -EINVAL;
+ if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
+ return -EINVAL;

req->sync.off = READ_ONCE(sqe->off);
req->sync.len = READ_ONCE(sqe->addr);
@@ -2935,6 +2939,8 @@ static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
const char __user *fname;
int ret;

+ if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL)))
+ return -EINVAL;
if (sqe->ioprio || sqe->buf_index)
return -EINVAL;
if (req->flags & REQ_F_FIXED_FILE)
@@ -2968,6 +2974,8 @@ static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
size_t len;
int ret;

+ if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL)))
+ return -EINVAL;
if (sqe->ioprio || sqe->buf_index)
return -EINVAL;
if (req->flags & REQ_F_FIXED_FILE)
@@ -3207,6 +3215,8 @@ static int io_epoll_ctl_prep(struct io_kiocb *req,
#if defined(CONFIG_EPOLL)
if (sqe->ioprio || sqe->buf_index)
return -EINVAL;
+ if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
+ return -EINVAL;

req->epoll.epfd = READ_ONCE(sqe->fd);
req->epoll.op = READ_ONCE(sqe->len);
@@ -3251,6 +3261,8 @@ static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
if (sqe->ioprio || sqe->buf_index || sqe->off)
return -EINVAL;
+ if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
+ return -EINVAL;

req->madvise.addr = READ_ONCE(sqe->addr);
req->madvise.len = READ_ONCE(sqe->len);
@@ -3285,6 +3297,8 @@ static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
if (sqe->ioprio || sqe->buf_index || sqe->addr)
return -EINVAL;
+ if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
+ return -EINVAL;

req->fadvise.offset = READ_ONCE(sqe->off);
req->fadvise.len = READ_ONCE(sqe->len);
@@ -3322,6 +3336,8 @@ static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
unsigned lookup_flags;
int ret;

+ if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
+ return -EINVAL;
if (sqe->ioprio || sqe->buf_index)
return -EINVAL;
if (req->flags & REQ_F_FIXED_FILE)
@@ -3402,6 +3418,8 @@ static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
*/
req->work.flags |= IO_WQ_WORK_NO_CANCEL;

+ if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL)))
+ return -EINVAL;
if (sqe->ioprio || sqe->off || sqe->addr || sqe->len ||
sqe->rw_flags || sqe->buf_index)
return -EINVAL;
--
2.25.1