From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Date: Fri, 25 Sep 2020 04:51:41 +0000 Subject: [PATCH 4/9] iov_iter: transparently handle compat iovecs in import_iovec Message-Id: <20200925045146.1283714-5-hch@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit List-Id: References: <20200925045146.1283714-1-hch@lst.de> In-Reply-To: <20200925045146.1283714-1-hch@lst.de> To: Alexander Viro Cc: Andrew Morton , Jens Axboe , Arnd Bergmann , David Howells , David Laight , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-aio@kvack.org, io-uring@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, keyrings@vger.kernel.org, linux-security-module@vger.kernel.org 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 --- block/scsi_ioctl.c | 12 ++---------- drivers/scsi/sg.c | 9 +-------- fs/aio.c | 8 ++------ fs/io_uring.c | 20 ++++++++------------ fs/read_write.c | 6 ++++-- fs/splice.c | 2 +- include/linux/uio.h | 8 -------- lib/iov_iter.c | 14 ++------------ mm/process_vm_access.c | 3 ++- net/compat.c | 4 ++-- security/keys/compat.c | 5 ++--- 11 files changed, 26 insertions(+), 65 deletions(-) diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c index ef722f04f88a93..e08df86866ee5d 100644 --- a/block/scsi_ioctl.c +++ b/block/scsi_ioctl.c @@ -333,16 +333,8 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk, struct iov_iter i; struct iovec *iov = NULL; -#ifdef CONFIG_COMPAT - if (in_compat_syscall()) - ret = compat_import_iovec(rq_data_dir(rq), - hdr->dxferp, hdr->iovec_count, - 0, &iov, &i); - else -#endif - ret = import_iovec(rq_data_dir(rq), - hdr->dxferp, hdr->iovec_count, - 0, &iov, &i); + ret = import_iovec(rq_data_dir(rq), hdr->dxferp, + hdr->iovec_count, 0, &iov, &i); if (ret < 0) goto out_free_cdb; diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c index 20472aaaf630a4..bfa8d77322d732 100644 --- a/drivers/scsi/sg.c +++ b/drivers/scsi/sg.c @@ -1820,14 +1820,7 @@ sg_start_req(Sg_request *srp, unsigned char *cmd) struct iovec *iov = NULL; struct iov_iter i; -#ifdef CONFIG_COMPAT - if (in_compat_syscall()) - res = compat_import_iovec(rw, hp->dxferp, iov_count, - 0, &iov, &i); - else -#endif - res = import_iovec(rw, hp->dxferp, iov_count, - 0, &iov, &i); + res = import_iovec(rw, hp->dxferp, iov_count, 0, &iov, &i); if (res < 0) return res; diff --git a/fs/aio.c b/fs/aio.c index d5ec303855669d..c45c20d875388c 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 8b426aa29668cb..8c27dc28da182a 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -2852,13 +2852,8 @@ 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, @@ -4200,8 +4195,9 @@ 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; } @@ -4241,9 +4237,9 @@ 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 e5e891a88442ef..0a68037580b455 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 d7c8a7c4db07ff..132d42b9871f9b 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); diff --git a/include/linux/uio.h b/include/linux/uio.h index 92c11fe41c6228..daedc61ad3706e 100644 --- a/include/linux/uio.h +++ b/include/linux/uio.h @@ -275,14 +275,6 @@ ssize_t import_iovec(int type, const struct iovec __user *uvec, ssize_t __import_iovec(int type, const struct iovec __user *uvec, unsigned nr_segs, unsigned fast_segs, struct iovec **iovp, struct iov_iter *i, bool compat); - -#ifdef CONFIG_COMPAT -struct compat_iovec; -ssize_t compat_import_iovec(int type, const struct compat_iovec __user * uvector, - unsigned nr_segs, unsigned fast_segs, - struct iovec **iov, struct iov_iter *i); -#endif - int import_single_range(int type, void __user *buf, size_t len, struct iovec *iov, struct iov_iter *i); diff --git a/lib/iov_iter.c b/lib/iov_iter.c index d5d8afe31fca16..8c51e1b03814a3 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -1806,21 +1806,11 @@ ssize_t import_iovec(int type, const struct iovec __user *uvec, unsigned nr_segs, unsigned fast_segs, struct iovec **iovp, struct iov_iter *i) { - return __import_iovec(type, uvec, nr_segs, fast_segs, iovp, i, false); + return __import_iovec(type, uvec, nr_segs, fast_segs, iovp, i, + in_compat_syscall()); } EXPORT_SYMBOL(import_iovec); -#ifdef CONFIG_COMPAT -ssize_t compat_import_iovec(int type, const struct compat_iovec __user *uvec, - unsigned nr_segs, unsigned fast_segs, struct iovec **iovp, - struct iov_iter *i) -{ - return __import_iovec(type, (const struct iovec __user *)uvec, nr_segs, - fast_segs, iovp, i, true); -} -EXPORT_SYMBOL(compat_import_iovec); -#endif - int import_single_range(int rw, void __user *buf, size_t len, struct iovec *iov, struct iov_iter *i) { diff --git a/mm/process_vm_access.c b/mm/process_vm_access.c index 5e728c20c2bead..3f2156aab44263 100644 --- a/mm/process_vm_access.c +++ b/mm/process_vm_access.c @@ -326,7 +326,8 @@ compat_process_vm_rw(compat_pid_t pid, if (flags != 0) return -EINVAL; - rc = compat_import_iovec(dir, lvec, liovcnt, UIO_FASTIOV, &iov_l, &iter); + rc = import_iovec(dir, (const struct iovec __user *)lvec, liovcnt, + UIO_FASTIOV, &iov_l, &iter); if (rc < 0) return rc; if (!iov_iter_count(&iter)) diff --git a/net/compat.c b/net/compat.c index 95ce707a30a31d..ddd15af3a2837b 100644 --- a/net/compat.c +++ b/net/compat.c @@ -98,8 +98,8 @@ int get_compat_msghdr(struct msghdr *kmsg, if (err) return err; - err = compat_import_iovec(save_addr ? READ : WRITE, compat_ptr(ptr), - len, UIO_FASTIOV, iov, &kmsg->msg_iter); + err = import_iovec(save_addr ? READ : WRITE, compat_ptr(ptr), len, + UIO_FASTIOV, iov, &kmsg->msg_iter); return err < 0 ? err : 0; } diff --git a/security/keys/compat.c b/security/keys/compat.c index 6ee9d8f6a4a5bb..7ae531db031cf8 100644 --- a/security/keys/compat.c +++ b/security/keys/compat.c @@ -33,9 +33,8 @@ static long compat_keyctl_instantiate_key_iov( if (!_payload_iov) ioc = 0; - ret = compat_import_iovec(WRITE, _payload_iov, ioc, - ARRAY_SIZE(iovstack), &iov, - &from); + ret = import_iovec(WRITE, (const struct iovec __user *)_payload_iov, + ioc, ARRAY_SIZE(iovstack), &iov, &from); if (ret < 0) return ret; -- 2.28.0