pub unsafe fn mprotect(
addr: NonNull<c_void>,
length: size_t,
prot: ProtFlags,
) -> Result<()>Available on crate feature
mman only.Expand description
Set protection of memory mapping.
See mprotect(3) for
details.
ยงSafety
Calls to mprotect are inherently unsafe, as changes to memory protections can lead to
SIGSEGVs.
const ONE_K: size_t = 1024;
let one_k_non_zero = std::num::NonZeroUsize::new(ONE_K).unwrap();
let mut slice: &mut [u8] = unsafe {
let mem = mmap_anonymous(None, one_k_non_zero, ProtFlags::PROT_NONE, MapFlags::MAP_PRIVATE)
.unwrap();
mprotect(mem, ONE_K, ProtFlags::PROT_READ | ProtFlags::PROT_WRITE).unwrap();
std::slice::from_raw_parts_mut(mem.as_ptr().cast(), ONE_K)
};
assert_eq!(slice[0], 0x00);
slice[0] = 0xFF;
assert_eq!(slice[0], 0xFF);