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use core::alloc::{Allocator, Layout};
use core::mem::ManuallyDrop;
use core::num::NonZeroUsize;
use core::ops::{Deref, DerefMut};
use core::ptr::NonNull;
use core::ptr::Unique;
use sgx_types::error::{SgxResult, SgxStatus};
cfg_if! {
if #[cfg(not(feature = "hyper"))] {
pub use stack::OcAlloc;
} else {
pub use msbuf::OcAlloc;
}
}
#[derive(Debug)]
pub struct OcBuffer {
buf: Unique<[u8]>,
}
impl !Send for OcBuffer {}
impl OcBuffer {
#[inline]
pub fn alloc(len: NonZeroUsize) -> SgxResult<OcBuffer> {
Self::alloc_aligned(len, NonZeroUsize::new(1).unwrap())
}
#[inline]
pub fn alloc_aligned(len: NonZeroUsize, align: NonZeroUsize) -> SgxResult<OcBuffer> {
let layout = Layout::from_size_align(len.get(), align.get())
.map_err(|_| SgxStatus::InvalidParameter)?;
let mut buf = OcAlloc
.allocate(layout)
.map_err(|_| SgxStatus::Unexpected)?;
Ok(OcBuffer {
buf: unsafe { Unique::from(buf.as_mut()) },
})
}
#[inline]
pub fn alloc_zeroed(len: NonZeroUsize) -> SgxResult<OcBuffer> {
Self::alloc_aligned_zeroed(len, NonZeroUsize::new(1).unwrap())
}
#[inline]
pub fn alloc_aligned_zeroed(len: NonZeroUsize, align: NonZeroUsize) -> SgxResult<OcBuffer> {
let mut host_buf = Self::alloc_aligned(len, align)?;
host_buf.fill(0);
Ok(host_buf)
}
#[inline]
pub fn into_raw(b: Self) -> *mut [u8] {
ManuallyDrop::new(b).as_mut() as *mut [u8]
}
#[inline]
pub unsafe fn from_raw(mut ptr: NonNull<[u8]>) -> OcBuffer {
OcBuffer {
buf: Unique::from(ptr.as_mut()),
}
}
#[inline]
pub(crate) unsafe fn free() -> SgxResult {
OcAlloc.oc_free()
}
#[inline]
pub fn remain_size() -> usize {
OcAlloc.oc_remain_size()
}
}
impl Drop for OcBuffer {
#[inline]
fn drop(&mut self) {
let layout = Layout::from_size_align(self.len(), 1).unwrap();
unsafe { OcAlloc.deallocate(NonNull::new_unchecked(self.as_mut_ptr()), layout) }
}
}
impl AsRef<[u8]> for OcBuffer {
fn as_ref(&self) -> &[u8] {
self
}
}
impl AsMut<[u8]> for OcBuffer {
fn as_mut(&mut self) -> &mut [u8] {
self
}
}
impl Deref for OcBuffer {
type Target = [u8];
#[inline]
fn deref(&self) -> &Self::Target {
unsafe { self.buf.as_ref() }
}
}
impl DerefMut for OcBuffer {
#[inline]
fn deref_mut(&mut self) -> &mut Self::Target {
unsafe { self.buf.as_mut() }
}
}
#[cfg(not(feature = "hyper"))]
mod stack {
use crate::arch::{self, SsaGpr};
use crate::enclave;
use crate::tcs;
use core::alloc::{AllocError, Allocator, Layout};
use core::cmp;
use core::mem;
use core::ptr::NonNull;
use sgx_types::error::{SgxResult, SgxStatus};
pub struct OcAlloc;
unsafe impl Allocator for OcAlloc {
fn allocate(&self, layout: Layout) -> Result<NonNull<[u8]>, AllocError> {
self.ocalloc(layout)
.map(|addr| NonNull::slice_from_raw_parts(addr, layout.size()))
.map_err(|_| AllocError)
}
#[inline]
unsafe fn deallocate(&self, ptr: NonNull<u8>, layout: Layout) {
if layout.size() != 0 && enclave::is_within_host(ptr.as_ptr(), layout.size()) {
let _ = self.oc_free();
}
}
}
impl OcAlloc {
const OC_MIN_ALIGN: usize = 0x10;
const OC_MAX_ALIGN: usize = 0x1000;
fn ocalloc(&self, layout: Layout) -> SgxResult<NonNull<u8>> {
ensure!(layout.size() != 0, SgxStatus::Unexpected);
let layout = layout.align_to(OcAlloc::OC_MIN_ALIGN).unwrap();
let align = cmp::min(layout.align(), OcAlloc::OC_MAX_ALIGN);
let size = layout.size();
let tc = tcs::current();
let tds = tc.tds();
let ssa_gpr = unsafe { &mut *(tds.first_ssa_gpr as *mut SsaGpr) };
let mut addr = ssa_gpr.rsp_u as usize;
ensure!(
enclave::is_within_host(addr as *const u8, mem::size_of::<usize>()),
SgxStatus::Unexpected
);
if addr < size {
bail!(SgxStatus::Unexpected);
}
addr -= size;
addr &= !(align - 1);
ensure!(
enclave::is_within_host(addr as *const u8, size),
SgxStatus::Unexpected
);
let first_page = trim_to_page!(ssa_gpr.rsp_u as usize - 1);
let last_page = trim_to_page!(addr);
if last_page == 0 {
bail!(SgxStatus::Unexpected);
}
let mut page = first_page;
while page >= last_page {
ssa_gpr.rsp_u = page as u64;
unsafe {
*(page as *mut u8) = 0;
}
page -= arch::SE_PAGE_SIZE;
}
ssa_gpr.rsp_u = addr as u64;
NonNull::new(addr as *mut u8).ok_or(SgxStatus::Unexpected)
}
pub(super) unsafe fn oc_free(&self) -> SgxResult {
let tc = tcs::current();
let tds = tc.tds();
let ssa_gpr = &mut *(tds.first_ssa_gpr as *mut SsaGpr);
let addr = tds.last_sp - 3 * mem::size_of::<usize>();
let usp = *(addr as *const usize);
if enclave::is_within_host(usp as *const u8, mem::size_of::<usize>()) {
ssa_gpr.rsp_u = usp as u64;
Ok(())
} else {
Err(SgxStatus::Unexpected)
}
}
#[inline]
pub fn oc_remain_size(&self) -> usize {
const MAX_OC_REMAIN_SIZE: usize = 0x4000; MAX_OC_REMAIN_SIZE
}
}
}
#[cfg(feature = "hyper")]
mod msbuf {
use crate::call::MsbufInfo;
use crate::enclave;
use crate::tcs;
use core::alloc::{AllocError, Allocator, Layout};
use core::cmp;
use core::ptr::NonNull;
use sgx_types::error::{SgxResult, SgxStatus};
pub struct OcAlloc;
unsafe impl Allocator for OcAlloc {
fn allocate(&self, layout: Layout) -> Result<NonNull<[u8]>, AllocError> {
self.ocalloc(layout)
.map(|addr| NonNull::slice_from_raw_parts(addr, layout.size()))
.map_err(|_| AllocError)
}
#[inline]
unsafe fn deallocate(&self, ptr: NonNull<u8>, layout: Layout) {
if layout.size() != 0 && enclave::is_within_host(ptr.as_ptr(), layout.size()) {
let _ = self.oc_free();
}
}
}
impl OcAlloc {
const OC_MIN_ALIGN: usize = 0x10;
const OC_MAX_ALIGN: usize = 0x1000;
fn ocalloc(&self, layout: Layout) -> SgxResult<NonNull<u8>> {
ensure!(layout.size() != 0, SgxStatus::Unexpected);
let layout = layout.align_to(OcAlloc::OC_MIN_ALIGN).unwrap();
let align = cmp::min(layout.align(), OcAlloc::OC_MAX_ALIGN);
let layout =
Layout::from_size_align(layout.size(), align).map_err(|_| SgxStatus::Unexpected)?;
let tc = tcs::current();
let tds = tc.tds();
let msbuf_info = MsbufInfo::get();
let addr = msbuf_info.alloc(tds.index, layout)?;
ensure!(
enclave::is_within_host(addr.as_ptr() as *const u8, layout.size()),
SgxStatus::Unexpected
);
Ok(addr)
}
pub(super) unsafe fn oc_free(&self) -> SgxResult {
let tc = tcs::current();
let tds = tc.tds();
let msbuf_info = MsbufInfo::get();
msbuf_info.free(tds.index)
}
pub fn oc_remain_size(&self) -> usize {
let tc = tcs::current();
let tds = tc.tds();
let msbuf_info = MsbufInfo::get();
msbuf_info.remain_size(tds.index).unwrap_or(0)
}
}
}