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An extremely experimental Binary Ninja importer for the type layout information emitted by the -Zprint-type-sizes flag of the Rust compiler.

License: MIT License

Python 100.00%
binary-ninja binary-ninja-plugin reverse-engineering rust rust-lang

rust_type_layout_helper_bn's Issues

#[repr(C)] union types are not imported correctly

When importing the following types:

print-type-size type: `std::sys_common::net::SocketAddrCRepr`: 28 bytes, alignment: 4 bytes
print-type-size     variant `SocketAddrCRepr`: 28 bytes
print-type-size         field `.v4`: 16 bytes
print-type-size         field `.v6`: 28 bytes, offset: 0 bytes, alignment: 4 bytes
print-type-size type: `std::sys::windows::c::IO_STATUS_BLOCK_union`: 8 bytes, alignment: 8 bytes
print-type-size     variant `IO_STATUS_BLOCK_union`: 8 bytes
print-type-size         field `.Status`: 4 bytes
print-type-size         field `.Pointer`: 8 bytes, offset: 0 bytes, alignment: 8 bytes

We see the following errors regarding size mismatches:

Size of created variant struct (44 bytes) does not match size of parsed Rust variant struct (28 bytes)
Created struct for Rust type std::sys_common::net::SocketAddrCRepr has size (44 bytes) which does not match size of parsed Rust type (28 bytes)
Size of created variant struct (12 bytes) does not match size of parsed Rust variant struct (8 bytes)
Created struct for Rust type std::sys::windows::c::IO_STATUS_BLOCK_union has size (12 bytes) which does not match size of parsed Rust type (8 bytes)

The original types definitions in Rust are:

#[repr(C)]
pub(crate) union SocketAddrCRepr {
    v4: c::sockaddr_in,
    v6: c::sockaddr_in6,
}

#[repr(C)]
union IO_STATUS_BLOCK_union {
    Status: NTSTATUS,
    Pointer: *mut c_void,
}

Source for SocketAddrCRepr (Rust 1.67.1): https://github.com/rust-lang/rust/blob/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/sys_common/net.rs#L720
Source for IO_STATUS_BLOCK_union (Rust 1.67.1): https://github.com/rust-lang/rust/blob/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/sys/windows/c.rs#LL335C8-L335C8

The created type definitions in Binary Ninja are the following. Rather than being created as an union with two members, these types are incorrectly created as a union containing a struct with two members. This causes the created type size to be too large.

struct std::sys_common::net::SocketAddrCRepr __packed
{
    union __packed
    {
        struct std::sys_common::net::SocketAddrCRepr::SocketAddrCRepr SocketAddrCRepr;
    } std::sys_common::net::SocketAddrCRepr::variants;
};

struct std::sys_common::net::SocketAddrCRepr::SocketAddrCRepr __packed
{
    int128_t .v4;
    char .v6[0x1c];
};

struct std::sys::windows::c::IO_STATUS_BLOCK_union __packed
{
    union __packed
    {
        struct std::sys::windows::c::IO_STATUS_BLOCK_union::IO_STATUS_BLOCK_union IO_STATUS_BLOCK_union;
    } std::sys::windows::c::IO_STATUS_BLOCK_union::variants;
};

struct std::sys::windows::c::IO_STATUS_BLOCK_union::IO_STATUS_BLOCK_union __packed
{
    int32_t .Status;
    int64_t .Pointer;
};

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