From 89cd35c58bc2e36bfdc23dde67a429b08cf4ae03 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Fri, 25 Sep 2020 06:51:41 +0200 Subject: iov_iter: transparently handle compat iovecs in import_iovec Use in compat_syscall to import either native or the compat iovecs, and remove the now superflous compat_import_iovec. This removes the need for special compat logic in most callers, and the remaining ones can still be simplified by using __import_iovec with a bool compat parameter. Signed-off-by: Christoph Hellwig Signed-off-by: Al Viro --- fs/aio.c | 8 ++------ fs/io_uring.c | 20 ++++++++------------ fs/read_write.c | 6 ++++-- fs/splice.c | 2 +- 4 files changed, 15 insertions(+), 21 deletions(-) (limited to 'fs') diff --git a/fs/aio.c b/fs/aio.c index 5736bff48e9e..247f05533dd5 100644 --- a/fs/aio.c +++ b/fs/aio.c @@ -1489,12 +1489,8 @@ static ssize_t aio_setup_rw(int rw, const struct iocb *iocb, *iovec = NULL; return ret; } -#ifdef CONFIG_COMPAT - if (compat) - return compat_import_iovec(rw, buf, len, UIO_FASTIOV, iovec, - iter); -#endif - return import_iovec(rw, buf, len, UIO_FASTIOV, iovec, iter); + + return __import_iovec(rw, buf, len, UIO_FASTIOV, iovec, iter, compat); } static inline void aio_rw_done(struct kiocb *req, ssize_t ret) diff --git a/fs/io_uring.c b/fs/io_uring.c index 91e2cc8414f9..b75c699b5cb7 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -2846,13 +2846,8 @@ static ssize_t __io_import_iovec(int rw, struct io_kiocb *req, return ret; } -#ifdef CONFIG_COMPAT - if (req->ctx->compat) - return compat_import_iovec(rw, buf, sqe_len, UIO_FASTIOV, - iovec, iter); -#endif - - return import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter); + return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter, + req->ctx->compat); } static ssize_t io_import_iovec(int rw, struct io_kiocb *req, @@ -4166,8 +4161,9 @@ static int __io_recvmsg_copy_hdr(struct io_kiocb *req, sr->len); iomsg->iov = NULL; } else { - ret = import_iovec(READ, uiov, iov_len, UIO_FASTIOV, - &iomsg->iov, &iomsg->msg.msg_iter); + ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, + &iomsg->iov, &iomsg->msg.msg_iter, + false); if (ret > 0) ret = 0; } @@ -4207,9 +4203,9 @@ static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, sr->len = iomsg->iov[0].iov_len; iomsg->iov = NULL; } else { - ret = compat_import_iovec(READ, uiov, len, UIO_FASTIOV, - &iomsg->iov, - &iomsg->msg.msg_iter); + ret = __import_iovec(READ, (struct iovec __user *)uiov, len, + UIO_FASTIOV, &iomsg->iov, + &iomsg->msg.msg_iter, true); if (ret < 0) return ret; } diff --git a/fs/read_write.c b/fs/read_write.c index e5e891a88442..0a68037580b4 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -1078,7 +1078,8 @@ static size_t compat_readv(struct file *file, struct iov_iter iter; ssize_t ret; - ret = compat_import_iovec(READ, vec, vlen, UIO_FASTIOV, &iov, &iter); + ret = import_iovec(READ, (const struct iovec __user *)vec, vlen, + UIO_FASTIOV, &iov, &iter); if (ret >= 0) { ret = do_iter_read(file, &iter, pos, flags); kfree(iov); @@ -1186,7 +1187,8 @@ static size_t compat_writev(struct file *file, struct iov_iter iter; ssize_t ret; - ret = compat_import_iovec(WRITE, vec, vlen, UIO_FASTIOV, &iov, &iter); + ret = import_iovec(WRITE, (const struct iovec __user *)vec, vlen, + UIO_FASTIOV, &iov, &iter); if (ret >= 0) { file_start_write(file); ret = do_iter_write(file, &iter, pos, flags); diff --git a/fs/splice.c b/fs/splice.c index d7c8a7c4db07..132d42b9871f 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -1387,7 +1387,7 @@ COMPAT_SYSCALL_DEFINE4(vmsplice, int, fd, const struct compat_iovec __user *, io if (error) return error; - error = compat_import_iovec(type, iov32, nr_segs, + error = import_iovec(type, (struct iovec __user *)iov32, nr_segs, ARRAY_SIZE(iovstack), &iov, &iter); if (error >= 0) { error = do_vmsplice(f.file, &iter, flags); -- cgit v1.2.3