I have a untrusted function declared as below:
```
int ocall_call(
[in, count=en_req_size] const uint8_t* en_req,
size_t en_req_size,
[out] void** output,
[out] size_t* output_size
) ;
```
and defined as below:
```
#[no_mangle]
pub extern "C" fn ocall_call(
en_req: *const u8,
en_req_size: usize,
output: *mut *mut libc::c_void,
output_size: *mut usize,
) -> sgx_status_t {
let en_req_slice = unsafe { slice::from_raw_parts(en_req, en_req_size) };
// ... here omits the step to get res from en_req_slice, which works well.
let s = serde_json::to_string(&res).unwrap();
unsafe {
*output = libc::malloc(s.len());
//TODO 判断malloc是否成功，参考：
https://github.com/apache/incubator-teaclave-sgx-sdk/blob/e60e5adfadcbe4b34913d1c82cd5f7ac021fc3cf/sgx_urts/src/mem.rs#L22
std::ptr::copy_nonoverlapping(s.as_ptr(), *(output as *mut *mut u8),
s.len());
*output_size = s.len();
}
sgx_status_t::SGX_SUCCESS
}
```
everything works well now. Then I try free the memory allocated in ocall_call
by:
1. calling libc::free in TEE, core dumpped raised without any tips.
2. ocall_free(p *mut libc::c_void) { libc::free(p) } , core dumped with tip
`munmap_chunk(): invalid pointer `, then I print the address p before and
after ocall_free, get the different value.
neither of that does work.
plz help, thanks.
Bing
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