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iov_iter: transparently handle compat iovecs in import_iovec

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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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6
fs/read_write.c
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@@ -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);