[−][src]Crate ma_proper
This crate provides the securely overwriting memory allocator MAProper
🧹
What is MAProper
MAProper
is an extension around std::alloc::System
which ensures that the allocated memory
is always erased before it is deallocated by using one of
memset_s
/SecureZeroMemory
/explicit_bzero
/explicit_memset
.
Whats the purpose of MAProper
MAProper
becomes handy if you're dealing with a lot of sensitive data: because the memory
management of dynamically allocating types like Vec
or String
is opaque, you basically have
no real chance to reliably erase their sensitive contents.
However they all use the global allocator – so all ways lead to Rome (or in this case to the
global allocator's alloc
and dealloc
functions) – which is where MAProper
is sitting and
waiting to take care of the discarded memory.
Using MAProper
as global allocator (example)
#[global_allocator] static MA_PROPER: MAProper = MAProper; fn main() { // This `Vec` will allocate memory through `MA_PROPER` above let mut v = Vec::new(); v.push(1); }
Please note that MAProper
only erases memory that is deallocated properly. This especially
means that:
- stack items are not erased by this allocator – to erase stack memory, we expose
MAProper::erase_slice
andMAProper::erase_ptr<T>
so that you can erase them manually if necessary - depending on your panic-policy and your
Rc
/Arc
use (retain-cycles), the destructor (and thus the deallocator) may never be called
Structs
MAProper | The |
Functions
erase_ptr⚠ | Erases |
erase_slice | Erases a byte slice |