RUSTSEC-2023-0045: memoffset allows reading uninitialized memory

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memoffset allows reading uninitialized memory

Details
Status	unsound
Package	memoffset
Version	0.5.6
URL	Gilnaa/memoffset#24
Date	2023-06-21

memoffset allows attempt of reading data from address 0 with arbitrary type. This behavior is an undefined behavior because address 0 to std::mem::size_of<T> may not have valid bit-pattern with T. Old implementation dereferences uninitialized memory obtained from std::mem::align_of. Older implementation prior to it allows using uninitialized data obtained from std::mem::uninitialized with arbitrary type then compute offset by taking the address of field-projection. This may also result in an undefined behavior for "father" that includes (directly or transitively) type that does not allow to be uninitialized.

This flaw was corrected by using std::ptr::addr_of in <Gilnaa/memoffset#50>.

See advisory page for additional details.