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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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14
lib/iov_iter.c
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@@ -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)
{