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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>
This commit is contained in:
Christoph Hellwig 2020-09-25 06:51:41 +02:00 committed by Al Viro
parent bfdc59701d
commit 89cd35c58b
11 changed files with 26 additions and 65 deletions
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12
block/scsi_ioctl.c
View File

@ -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;

9
drivers/scsi/sg.c
View File

@ -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;

8
fs/aio.c
View File

@ -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)

20
fs/io_uring.c
View File

@ -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;
}

6
fs/read_write.c
View File

@ -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);

2
fs/splice.c
View File

@ -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);

8
include/linux/uio.h
View File

@ -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);

14
lib/iov_iter.c
View File

@ -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)
{

3
mm/process_vm_access.c
View File

@ -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))

4
net/compat.c
View File

@ -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;
}

5
security/keys/compat.c
View File

@ -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;