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iov_iter/hardening: move object size checks to inlined part

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There we actually have useful information about object sizes.
Note: this patch has them done for all iov_iter flavours.
Right now we do them twice in iovec case, but that'll change
very shortly.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2017-06-29 21:45:10 -04:00
parent b0377fedb6
commit aa28de275a
2 changed files with 64 additions and 16 deletions
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22
lib/iov_iter.c
View file

@ -535,7 +535,7 @@ static size_t copy_pipe_to_iter(const void *addr, size_t bytes,
return bytes;
}
size_t copy_to_iter(const void *addr, size_t bytes, struct iov_iter *i)
size_t _copy_to_iter(const void *addr, size_t bytes, struct iov_iter *i)
{
const char *from = addr;
if (unlikely(i->type & ITER_PIPE))
@ -550,9 +550,9 @@ size_t copy_to_iter(const void *addr, size_t bytes, struct iov_iter *i)
return bytes;
}
EXPORT_SYMBOL(copy_to_iter);
EXPORT_SYMBOL(_copy_to_iter);
size_t copy_from_iter(void *addr, size_t bytes, struct iov_iter *i)
size_t _copy_from_iter(void *addr, size_t bytes, struct iov_iter *i)
{
char *to = addr;
if (unlikely(i->type & ITER_PIPE)) {
@ -569,9 +569,9 @@ size_t copy_from_iter(void *addr, size_t bytes, struct iov_iter *i)
return bytes;
}
EXPORT_SYMBOL(copy_from_iter);
EXPORT_SYMBOL(_copy_from_iter);
bool copy_from_iter_full(void *addr, size_t bytes, struct iov_iter *i)
bool _copy_from_iter_full(void *addr, size_t bytes, struct iov_iter *i)
{
char *to = addr;
if (unlikely(i->type & ITER_PIPE)) {
@ -594,9 +594,9 @@ bool copy_from_iter_full(void *addr, size_t bytes, struct iov_iter *i)
iov_iter_advance(i, bytes);
return true;
}
EXPORT_SYMBOL(copy_from_iter_full);
EXPORT_SYMBOL(_copy_from_iter_full);
size_t copy_from_iter_nocache(void *addr, size_t bytes, struct iov_iter *i)
size_t _copy_from_iter_nocache(void *addr, size_t bytes, struct iov_iter *i)
{
char *to = addr;
if (unlikely(i->type & ITER_PIPE)) {
@ -613,9 +613,9 @@ size_t copy_from_iter_nocache(void *addr, size_t bytes, struct iov_iter *i)
return bytes;
}
EXPORT_SYMBOL(copy_from_iter_nocache);
EXPORT_SYMBOL(_copy_from_iter_nocache);
bool copy_from_iter_full_nocache(void *addr, size_t bytes, struct iov_iter *i)
bool _copy_from_iter_full_nocache(void *addr, size_t bytes, struct iov_iter *i)
{
char *to = addr;
if (unlikely(i->type & ITER_PIPE)) {
@ -637,7 +637,7 @@ bool copy_from_iter_full_nocache(void *addr, size_t bytes, struct iov_iter *i)
iov_iter_advance(i, bytes);
return true;
}
EXPORT_SYMBOL(copy_from_iter_full_nocache);
EXPORT_SYMBOL(_copy_from_iter_full_nocache);
size_t copy_page_to_iter(struct page *page, size_t offset, size_t bytes,
struct iov_iter *i)
@ -663,7 +663,7 @@ size_t copy_page_from_iter(struct page *page, size_t offset, size_t bytes,
}
if (i->type & (ITER_BVEC|ITER_KVEC)) {
void *kaddr = kmap_atomic(page);
size_t wanted = copy_from_iter(kaddr + offset, bytes, i);
size_t wanted = _copy_from_iter(kaddr + offset, bytes, i);
kunmap_atomic(kaddr);
return wanted;
} else