Merge pull request #124 from datachainlab/audit-202409-s-1

S-1: Fix to remove redundant check with `rsgx_raw_is_outside_enclave()`

Signed-off-by: Jun Kimura <jun.kimura@datachain.jp>

enclave-modules/utils/src/pointers.rs

@@ -1,19 +1,25 @@
 use log::*;
-use sgx_trts::trts::{rsgx_lfence, rsgx_raw_is_outside_enclave, rsgx_sfence};
+use sgx_trts::trts::{rsgx_lfence, rsgx_sfence};
 use sgx_types::*;
 
+/// Validates a mutable pointer and its length.
+///
+/// Assumes that the `ptr` is a valid pointer of enclave outside memory.
 pub fn validate_mut_ptr(ptr: *mut u8, ptr_len: usize) -> SgxResult<()> {
-    if rsgx_raw_is_outside_enclave(ptr, ptr_len) {
-        warn!("Tried to access memory outside enclave -- rsgx_slice_is_outside_enclave");
+    if ptr.is_null() || ptr_len == 0 {
+        warn!("Tried to access an empty pointer - ptr.is_null() || ptr_len == 0");
         return Err(sgx_status_t::SGX_ERROR_UNEXPECTED);
     }
     rsgx_sfence();
     Ok(())
 }
 
+/// Validates a constant pointer and its length.
+///
+/// Assumes that the `ptr` is a valid pointer of enclave outside memory.
 pub fn validate_const_ptr(ptr: *const u8, ptr_len: usize) -> SgxResult<()> {
     if ptr.is_null() || ptr_len == 0 {
-        warn!("Tried to access an empty pointer - ptr.is_null()");
+        warn!("Tried to access an empty pointer - ptr.is_null() || ptr_len == 0");
         return Err(sgx_status_t::SGX_ERROR_UNEXPECTED);
     }
     rsgx_lfence();