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io_uring: statx/openat/openat2 don't support fixed files

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All of these opcodes take a directory file descriptor. We can't easily
support fixed files for these operations, and the use case for that
probably isn't all that clear (or sensible) anyway.

Disable IOSQE_FIXED_FILE for these operations.

Reported-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-02-06 21:31:40 -07:00
parent 1e95081cb5
commit cf3040ca55
1 changed files with 7 additions and 1 deletions
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8
fs/io_uring.c
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@ -2516,6 +2516,8 @@ static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
if (sqe->ioprio || sqe->buf_index)
return -EINVAL;
if (sqe->flags & IOSQE_FIXED_FILE)
return -EBADF;
req->open.dfd = READ_ONCE(sqe->fd);
req->open.how.mode = READ_ONCE(sqe->len);
@ -2541,6 +2543,8 @@ static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
if (sqe->ioprio || sqe->buf_index)
return -EINVAL;
if (sqe->flags & IOSQE_FIXED_FILE)
return -EBADF;
req->open.dfd = READ_ONCE(sqe->fd);
fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
@ -2736,6 +2740,8 @@ static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
if (sqe->ioprio || sqe->buf_index)
return -EINVAL;
if (sqe->flags & IOSQE_FIXED_FILE)
return -EBADF;
req->open.dfd = READ_ONCE(sqe->fd);
req->open.mask = READ_ONCE(sqe->len);
@ -2809,7 +2815,7 @@ static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
sqe->rw_flags || sqe->buf_index)
return -EINVAL;
if (sqe->flags & IOSQE_FIXED_FILE)
return -EINVAL;
return -EBADF;
req->close.fd = READ_ONCE(sqe->fd);
if (req->file->f_op == &io_uring_fops ||