72 lines
2.3 KiB
Rust
72 lines
2.3 KiB
Rust
//! Helper functions for `prctl` syscalls.
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#![allow(unsafe_code)]
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use crate::backend::c::{c_int, c_void};
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use crate::backend::prctl::syscalls;
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use crate::io;
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use crate::utils::as_mut_ptr;
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use bitflags::bitflags;
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use core::mem::MaybeUninit;
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use core::ptr::null_mut;
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bitflags! {
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/// `PR_PAC_AP*`.
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#[repr(transparent)]
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#[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
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pub struct PointerAuthenticationKeys: u32 {
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/// `PR_PAC_APIAKEY`—Instruction authentication key `A`.
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const INSTRUCTION_AUTHENTICATION_KEY_A = linux_raw_sys::prctl::PR_PAC_APIAKEY;
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/// `PR_PAC_APIBKEY`—Instruction authentication key `B`.
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const INSTRUCTION_AUTHENTICATION_KEY_B = linux_raw_sys::prctl::PR_PAC_APIBKEY;
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/// `PR_PAC_APDAKEY`—Data authentication key `A`.
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const DATA_AUTHENTICATION_KEY_A = linux_raw_sys::prctl::PR_PAC_APDAKEY;
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/// `PR_PAC_APDBKEY`—Data authentication key `B`.
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const DATA_AUTHENTICATION_KEY_B = linux_raw_sys::prctl::PR_PAC_APDBKEY;
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/// `PR_PAC_APGAKEY`—Generic authentication `A` key.
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const GENERIC_AUTHENTICATION_KEY_A = linux_raw_sys::prctl::PR_PAC_APGAKEY;
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/// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
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const _ = !0;
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}
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}
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#[inline]
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pub(crate) unsafe fn prctl_1arg(option: c_int) -> io::Result<c_int> {
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const NULL: *mut c_void = null_mut();
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syscalls::prctl(option, NULL, NULL, NULL, NULL)
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}
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#[inline]
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pub(crate) unsafe fn prctl_2args(option: c_int, arg2: *mut c_void) -> io::Result<c_int> {
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const NULL: *mut c_void = null_mut();
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syscalls::prctl(option, arg2, NULL, NULL, NULL)
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}
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#[inline]
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pub(crate) unsafe fn prctl_3args(
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option: c_int,
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arg2: *mut c_void,
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arg3: *mut c_void,
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) -> io::Result<c_int> {
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syscalls::prctl(option, arg2, arg3, null_mut(), null_mut())
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}
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#[inline]
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pub(crate) unsafe fn prctl_get_at_arg2_optional<P>(option: i32) -> io::Result<P> {
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let mut value: MaybeUninit<P> = MaybeUninit::uninit();
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prctl_2args(option, value.as_mut_ptr().cast())?;
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Ok(value.assume_init())
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}
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#[inline]
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pub(crate) unsafe fn prctl_get_at_arg2<P, T>(option: i32) -> io::Result<T>
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where
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P: Default,
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T: TryFrom<P, Error = io::Errno>,
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{
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let mut value: P = Default::default();
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prctl_2args(option, as_mut_ptr(&mut value).cast())?;
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TryFrom::try_from(value)
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}
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