40 lines
1.0 KiB
Rust
40 lines
1.0 KiB
Rust
|
extern crate libc;
|
||
|
|
use core::prelude::*;
|
||
|
|
pub use self::libc::{c_void, c_int, size_t};
|
||
|
|
pub use self::libc::{mmap, mprotect, munmap};
|
||
|
|
pub use self::libc::MAP_FAILED;
|
||
|
|
|
||
|
|
use core::ptr;
|
||
|
|
|
||
|
|
pub fn page_size() -> usize {
|
||
|
|
unsafe {
|
||
|
|
libc::sysconf(libc::_SC_PAGESIZE) as usize
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
pub const GUARD_PROT: c_int = libc::PROT_NONE;
|
||
|
|
pub const STACK_PROT: c_int = libc::PROT_READ
|
||
|
|
| libc::PROT_WRITE;
|
||
|
|
pub const STACK_FLAGS: c_int = libc::MAP_STACK
|
||
|
|
| libc::MAP_PRIVATE
|
||
|
|
| libc::MAP_ANON;
|
||
|
|
|
||
|
|
pub unsafe fn map_stack(len: usize) -> Option<*mut u8> {
|
||
|
|
let ptr = mmap(ptr::null_mut(), len as size_t,
|
||
|
|
STACK_PROT, STACK_FLAGS, -1, 0);
|
||
|
|
if ptr != MAP_FAILED {
|
||
|
|
Some(ptr as *mut u8)
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
None
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
pub unsafe fn protect_stack(ptr: *mut u8) -> bool {
|
||
|
|
mprotect(ptr as *mut c_void, page_size() as size_t, GUARD_PROT) == 0
|
||
|
|
}
|
||
|
|
|
||
|
|
pub unsafe fn unmap_stack(ptr: *mut u8, len: usize) -> bool {
|
||
|
|
munmap(ptr as *mut c_void, len as size_t) == 0
|
||
|
|
}
|