Struct UserPtrWO 

pub struct UserPtrWO<T>
where
    T: Copy,
{
    addr: usize,
    _ty: PhantomData<T>,
}

A one-time, write-only pointer to a user-space object of type T.

This struct allows the kernel to write to user-space while ensuring safe access patterns. It prevents TOCTOU (Time-of-Check to Time-of-Use) attacks by taking ownership of the pointer during operations.

Type Parameter

• T: The type of the data being accessed. Must implement Copy.

Fields

addr: usize

_ty: PhantomData<T>

Implementations

impl<T> UserPtrWO<T>

where T: Copy,

pub fn new(addr: usize) -> Self

Creates a new UserPtrWO instance with the given user-space address.

pub fn put(self, other: T) -> Result<usize, KernelError>

Writes a value of type T to the user-space address.

Takes ownership of self to prevent TOCTOU attacks.

Returns Ok(usize) indicating the number of bytes written, or Err(KernelError::BadAddress) on failure.

Trait Implementations

impl<T> Debug for UserPtrWO<T>

where T: Copy + Debug,

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T> Ord for UserPtrWO<T>

where T: Copy + Ord,

fn cmp(&self, other: &UserPtrWO<T>) -> Ordering

This method returns an [Ordering] between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl<T> PartialEq for UserPtrWO<T>

where T: Copy + PartialEq,

fn eq(&self, other: &UserPtrWO<T>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T> PartialOrd for UserPtrWO<T>

where T: Copy + PartialOrd,

fn partial_cmp(&self, other: &UserPtrWO<T>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<T> Eq for UserPtrWO<T>

where T: Copy + Eq,

impl<T> StructuralPartialEq for UserPtrWO<T>

where T: Copy,