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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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4
net/compat.c
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@@ -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;
}