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author | Christoph Hellwig <hch@lst.de> | 2020-09-25 06:51:41 +0200 |
---|---|---|
committer | Al Viro <viro@zeniv.linux.org.uk> | 2020-10-03 00:02:13 -0400 |
commit | 89cd35c58bc2e36bfdc23dde67a429b08cf4ae03 (patch) | |
tree | 540a413bab63b20e24dba2dece0044277bb778a1 | |
parent | bfdc59701d6d100c99c3b987bcffd1c204e393c8 (diff) | |
download | linux-stable-89cd35c58bc2e36bfdc23dde67a429b08cf4ae03.tar.gz linux-stable-89cd35c58bc2e36bfdc23dde67a429b08cf4ae03.tar.bz2 linux-stable-89cd35c58bc2e36bfdc23dde67a429b08cf4ae03.zip |
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 <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r-- | block/scsi_ioctl.c | 12 | ||||
-rw-r--r-- | drivers/scsi/sg.c | 9 | ||||
-rw-r--r-- | fs/aio.c | 8 | ||||
-rw-r--r-- | fs/io_uring.c | 20 | ||||
-rw-r--r-- | fs/read_write.c | 6 | ||||
-rw-r--r-- | fs/splice.c | 2 | ||||
-rw-r--r-- | include/linux/uio.h | 8 | ||||
-rw-r--r-- | lib/iov_iter.c | 14 | ||||
-rw-r--r-- | mm/process_vm_access.c | 3 | ||||
-rw-r--r-- | net/compat.c | 4 | ||||
-rw-r--r-- | 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 ef722f04f88a..e08df86866ee 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 20472aaaf630..bfa8d77322d7 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; @@ -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); diff --git a/include/linux/uio.h b/include/linux/uio.h index 92c11fe41c62..daedc61ad370 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 e6cb51da3424..2e452ce7388b 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 5e728c20c2be..3f2156aab442 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 95ce707a30a3..ddd15af3a283 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 6ee9d8f6a4a5..7ae531db031c 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; |