forked from rust-lang/rust
/
mod.rs
251 lines (226 loc) · 9.62 KB
/
mod.rs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
use crate::cmp;
use crate::convert::TryFrom;
use crate::io::{Error as IoError, IoSlice, IoSliceMut, Result as IoResult};
use crate::sys::rand::rdrand64;
use crate::time::Duration;
pub(crate) mod alloc;
#[macro_use]
pub(crate) mod raw;
use self::raw::*;
/// Usercall `read`. See the ABI documentation for more information.
///
/// This will do a single `read` usercall and scatter the read data among
/// `bufs`. To read to a single buffer, just pass a slice of length one.
#[unstable(feature = "sgx_platform", issue = "56975")]
pub fn read(fd: Fd, bufs: &mut [IoSliceMut<'_>]) -> IoResult<usize> {
unsafe {
let total_len = bufs.iter().fold(0usize, |sum, buf| sum.saturating_add(buf.len()));
let mut userbuf = alloc::User::<[u8]>::uninitialized(total_len);
let ret_len = raw::read(fd, userbuf.as_mut_ptr(), userbuf.len()).from_sgx_result()?;
let userbuf = &userbuf[..ret_len];
let mut index = 0;
for buf in bufs {
let end = cmp::min(index + buf.len(), userbuf.len());
if let Some(buflen) = end.checked_sub(index) {
userbuf[index..end].copy_to_enclave(&mut buf[..buflen]);
index += buf.len();
} else {
break;
}
}
Ok(userbuf.len())
}
}
/// Usercall `read_alloc`. See the ABI documentation for more information.
#[unstable(feature = "sgx_platform", issue = "56975")]
pub fn read_alloc(fd: Fd) -> IoResult<Vec<u8>> {
unsafe {
let userbuf = ByteBuffer { data: crate::ptr::null_mut(), len: 0 };
let mut userbuf = alloc::User::new_from_enclave(&userbuf);
raw::read_alloc(fd, userbuf.as_raw_mut_ptr()).from_sgx_result()?;
Ok(userbuf.copy_user_buffer())
}
}
/// Usercall `write`. See the ABI documentation for more information.
///
/// This will do a single `write` usercall and gather the written data from
/// `bufs`. To write from a single buffer, just pass a slice of length one.
#[unstable(feature = "sgx_platform", issue = "56975")]
pub fn write(fd: Fd, bufs: &[IoSlice<'_>]) -> IoResult<usize> {
unsafe {
let total_len = bufs.iter().fold(0usize, |sum, buf| sum.saturating_add(buf.len()));
let mut userbuf = alloc::User::<[u8]>::uninitialized(total_len);
let mut index = 0;
for buf in bufs {
let end = cmp::min(index + buf.len(), userbuf.len());
if let Some(buflen) = end.checked_sub(index) {
userbuf[index..end].copy_from_enclave(&buf[..buflen]);
index += buf.len();
} else {
break;
}
}
raw::write(fd, userbuf.as_ptr(), userbuf.len()).from_sgx_result()
}
}
/// Usercall `flush`. See the ABI documentation for more information.
#[unstable(feature = "sgx_platform", issue = "56975")]
pub fn flush(fd: Fd) -> IoResult<()> {
unsafe { raw::flush(fd).from_sgx_result() }
}
/// Usercall `close`. See the ABI documentation for more information.
#[unstable(feature = "sgx_platform", issue = "56975")]
pub fn close(fd: Fd) {
unsafe { raw::close(fd) }
}
fn string_from_bytebuffer(buf: &alloc::UserRef<ByteBuffer>, usercall: &str, arg: &str) -> String {
String::from_utf8(buf.copy_user_buffer())
.unwrap_or_else(|_| rtabort!("Usercall {}: expected {} to be valid UTF-8", usercall, arg))
}
/// Usercall `bind_stream`. See the ABI documentation for more information.
#[unstable(feature = "sgx_platform", issue = "56975")]
pub fn bind_stream(addr: &str) -> IoResult<(Fd, String)> {
unsafe {
let addr_user = alloc::User::new_from_enclave(addr.as_bytes());
let mut local = alloc::User::<ByteBuffer>::uninitialized();
let fd = raw::bind_stream(addr_user.as_ptr(), addr_user.len(), local.as_raw_mut_ptr())
.from_sgx_result()?;
let local = string_from_bytebuffer(&local, "bind_stream", "local_addr");
Ok((fd, local))
}
}
/// Usercall `accept_stream`. See the ABI documentation for more information.
#[unstable(feature = "sgx_platform", issue = "56975")]
pub fn accept_stream(fd: Fd) -> IoResult<(Fd, String, String)> {
unsafe {
let mut bufs = alloc::User::<[ByteBuffer; 2]>::uninitialized();
let mut buf_it = alloc::UserRef::iter_mut(&mut *bufs); // FIXME: can this be done
// without forcing coercion?
let (local, peer) = (buf_it.next().unwrap(), buf_it.next().unwrap());
let fd = raw::accept_stream(fd, local.as_raw_mut_ptr(), peer.as_raw_mut_ptr())
.from_sgx_result()?;
let local = string_from_bytebuffer(&local, "accept_stream", "local_addr");
let peer = string_from_bytebuffer(&peer, "accept_stream", "peer_addr");
Ok((fd, local, peer))
}
}
/// Usercall `connect_stream`. See the ABI documentation for more information.
#[unstable(feature = "sgx_platform", issue = "56975")]
pub fn connect_stream(addr: &str) -> IoResult<(Fd, String, String)> {
unsafe {
let addr_user = alloc::User::new_from_enclave(addr.as_bytes());
let mut bufs = alloc::User::<[ByteBuffer; 2]>::uninitialized();
let mut buf_it = alloc::UserRef::iter_mut(&mut *bufs); // FIXME: can this be done
// without forcing coercion?
let (local, peer) = (buf_it.next().unwrap(), buf_it.next().unwrap());
let fd = raw::connect_stream(
addr_user.as_ptr(),
addr_user.len(),
local.as_raw_mut_ptr(),
peer.as_raw_mut_ptr(),
)
.from_sgx_result()?;
let local = string_from_bytebuffer(&local, "connect_stream", "local_addr");
let peer = string_from_bytebuffer(&peer, "connect_stream", "peer_addr");
Ok((fd, local, peer))
}
}
/// Usercall `launch_thread`. See the ABI documentation for more information.
#[unstable(feature = "sgx_platform", issue = "56975")]
pub unsafe fn launch_thread() -> IoResult<()> {
raw::launch_thread().from_sgx_result()
}
/// Usercall `exit`. See the ABI documentation for more information.
#[unstable(feature = "sgx_platform", issue = "56975")]
pub fn exit(panic: bool) -> ! {
unsafe { raw::exit(panic) }
}
/// Usercall `wait`. See the ABI documentation for more information.
#[unstable(feature = "sgx_platform", issue = "56975")]
pub fn wait(event_mask: u64, mut timeout: u64) -> IoResult<u64> {
if timeout != WAIT_NO && timeout != WAIT_INDEFINITE {
// We don't want people to rely on accuracy of timeouts to make
// security decisions in an SGX enclave. That's why we add a random
// amount not exceeding +/- 10% to the timeout value to discourage
// people from relying on accuracy of timeouts while providing a way
// to make things work in other cases. Note that in the SGX threat
// model the enclave runner which is serving the wait usercall is not
// trusted to ensure accurate timeouts.
if let Ok(timeout_signed) = i64::try_from(timeout) {
let tenth = timeout_signed / 10;
let deviation = (rdrand64() as i64).checked_rem(tenth).unwrap_or(0);
timeout = timeout_signed.saturating_add(deviation) as _;
}
}
unsafe { raw::wait(event_mask, timeout).from_sgx_result() }
}
/// Usercall `send`. See the ABI documentation for more information.
#[unstable(feature = "sgx_platform", issue = "56975")]
pub fn send(event_set: u64, tcs: Option<Tcs>) -> IoResult<()> {
unsafe { raw::send(event_set, tcs).from_sgx_result() }
}
/// Usercall `insecure_time`. See the ABI documentation for more information.
#[unstable(feature = "sgx_platform", issue = "56975")]
pub fn insecure_time() -> Duration {
let t = unsafe { raw::insecure_time() };
Duration::new(t / 1_000_000_000, (t % 1_000_000_000) as _)
}
/// Usercall `alloc`. See the ABI documentation for more information.
#[unstable(feature = "sgx_platform", issue = "56975")]
pub fn alloc(size: usize, alignment: usize) -> IoResult<*mut u8> {
unsafe { raw::alloc(size, alignment).from_sgx_result() }
}
#[unstable(feature = "sgx_platform", issue = "56975")]
#[doc(inline)]
pub use self::raw::free;
fn check_os_error(err: Result) -> i32 {
// FIXME: not sure how to make sure all variants of Error are covered
if err == Error::NotFound as _
|| err == Error::PermissionDenied as _
|| err == Error::ConnectionRefused as _
|| err == Error::ConnectionReset as _
|| err == Error::ConnectionAborted as _
|| err == Error::NotConnected as _
|| err == Error::AddrInUse as _
|| err == Error::AddrNotAvailable as _
|| err == Error::BrokenPipe as _
|| err == Error::AlreadyExists as _
|| err == Error::WouldBlock as _
|| err == Error::InvalidInput as _
|| err == Error::InvalidData as _
|| err == Error::TimedOut as _
|| err == Error::WriteZero as _
|| err == Error::Interrupted as _
|| err == Error::Other as _
|| err == Error::UnexpectedEof as _
|| ((Error::UserRangeStart as _)..=(Error::UserRangeEnd as _)).contains(&err)
{
err
} else {
rtabort!("Usercall: returned invalid error value {}", err)
}
}
trait FromSgxResult {
type Return;
fn from_sgx_result(self) -> IoResult<Self::Return>;
}
impl<T> FromSgxResult for (Result, T) {
type Return = T;
fn from_sgx_result(self) -> IoResult<Self::Return> {
if self.0 == RESULT_SUCCESS {
Ok(self.1)
} else {
Err(IoError::from_raw_os_error(check_os_error(self.0)))
}
}
}
impl FromSgxResult for Result {
type Return = ();
fn from_sgx_result(self) -> IoResult<Self::Return> {
if self == RESULT_SUCCESS {
Ok(())
} else {
Err(IoError::from_raw_os_error(check_os_error(self)))
}
}
}