diff --git a/deps/rust-sgx-sdk b/deps/rust-sgx-sdk
index 15b8470d..df76765f 160000
--- a/deps/rust-sgx-sdk
+++ b/deps/rust-sgx-sdk
@@ -1 +1 @@
-Subproject commit 15b8470dd50e9628e1cb7a0fdb08989f0b5ecc35
+Subproject commit df76765f586cf103189a5e62355672c96f4920ce
diff --git a/deps/rust-sgx-sdk.patch b/deps/rust-sgx-sdk.patch
index c0350a10..db0d9c52 100644
--- a/deps/rust-sgx-sdk.patch
+++ b/deps/rust-sgx-sdk.patch
@@ -1,25 +1,8 @@
-From 45e0641710606f98ed295063d171ca62990d32f3 Mon Sep 17 00:00:00 2001
-From: LI Qing <geding.lq@alibaba-inc.com>
-Date: Tue, 7 Jan 2020 12:20:05 +0000
-Subject: [PATCH] Add support for integrity-only SGX protected files
-
-1. Add SgxFile::open_integrity_only API
-2. Add SgxFile::create_integrity_only API
-3. Add the unit test for integrity-only SgxFile
----
- samplecode/unit-test/enclave/src/lib.rs       |  2 +
- samplecode/unit-test/enclave/src/test_file.rs | 41 +++++++++++++
- sgx_tprotected_fs/src/fs.rs                   | 84 +++++++++++++++++++++++++++
- sgx_tstd/src/sgxfs.rs                         | 39 ++++++++++++-
- sgx_tstd/src/sys/sgxfs.rs                     | 39 +++++++++++--
- sgx_types/src/function.rs                     |  3 +
- 6 files changed, 201 insertions(+), 7 deletions(-)
-
 diff --git a/samplecode/unit-test/enclave/src/lib.rs b/samplecode/unit-test/enclave/src/lib.rs
-index c04cb4d..14a6d63 100644
+index b9ea49be..d740753f 100644
 --- a/samplecode/unit-test/enclave/src/lib.rs
 +++ b/samplecode/unit-test/enclave/src/lib.rs
-@@ -157,6 +157,8 @@ fn test_main_entrance() -> size_t {
+@@ -166,6 +166,8 @@ fn test_main_entrance() -> size_t {
                      test_serialize_enum,
                      // std::sgxfs
                      test_sgxfs,
@@ -29,7 +12,7 @@ index c04cb4d..14a6d63 100644
                      test_fs,
                      // std::fs untrusted mode
 diff --git a/samplecode/unit-test/enclave/src/test_file.rs b/samplecode/unit-test/enclave/src/test_file.rs
-index 5e7466e..8b8d6d0 100644
+index 766ba674..eeefd9eb 100644
 --- a/samplecode/unit-test/enclave/src/test_file.rs
 +++ b/samplecode/unit-test/enclave/src/test_file.rs
 @@ -128,3 +128,44 @@ pub fn test_fs_untrusted_fs_feature_enabled() {
@@ -78,7 +61,7 @@ index 5e7466e..8b8d6d0 100644
 +    assert!(remove_result.is_ok());
 +}
 diff --git a/sgx_tprotected_fs/src/fs.rs b/sgx_tprotected_fs/src/fs.rs
-index 64d85d0..9ded4e8 100644
+index 93767e4b..9ddac357 100644
 --- a/sgx_tprotected_fs/src/fs.rs
 +++ b/sgx_tprotected_fs/src/fs.rs
 @@ -35,6 +35,15 @@ unsafe fn rsgx_fopen(filename: &CStr, mode: &CStr, key: &sgx_key_128bit_t) -> Sy
@@ -97,7 +80,7 @@ index 64d85d0..9ded4e8 100644
  unsafe fn rsgx_fopen_auto_key(filename: &CStr, mode: &CStr) -> SysResult<SGX_FILE> {
      let file = sgx_fopen_auto_key(filename.as_ptr(), mode.as_ptr());
      if file.is_null() {
-@@ -193,6 +202,15 @@ unsafe fn rsgx_fimport_auto_key(filename: &CStr, key: &sgx_key_128bit_t) -> SysE
+@@ -192,6 +201,15 @@ unsafe fn rsgx_fimport_auto_key(filename: &CStr, key: &sgx_key_128bit_t) -> SysE
      }
  }
  
@@ -113,10 +96,11 @@ index 64d85d0..9ded4e8 100644
  pub struct SgxFileStream {
      stream: SGX_FILE
  }
-@@ -278,6 +296,48 @@ impl SgxFileStream {
+@@ -275,6 +293,48 @@ impl SgxFileStream {
+         }
      }
  
-     ///
++    ///
 +    /// The open function creates or opens a protected file in the integrity-only mode.
 +    ///
 +    /// # Description
@@ -158,11 +142,10 @@ index 64d85d0..9ded4e8 100644
 +        }
 +    }
 +
-+    ///
+     ///
      /// The read function reads the requested amount of data from the file, and extends the file pointer by that amount.
      ///
-     /// # Description
-@@ -517,6 +577,30 @@ impl SgxFileStream {
+@@ -515,6 +575,30 @@ impl SgxFileStream {
      pub fn clear_cache(&self) -> SysError {
          unsafe { rsgx_fclear_cache(self.stream) }
      }
@@ -194,7 +177,7 @@ index 64d85d0..9ded4e8 100644
  
  ///
 diff --git a/sgx_tstd/src/sgxfs.rs b/sgx_tstd/src/sgxfs.rs
-index b07aaf2..ccb7f93 100644
+index 91b42d78..2c1af77a 100644
 --- a/sgx_tstd/src/sgxfs.rs
 +++ b/sgx_tstd/src/sgxfs.rs
 @@ -17,7 +17,7 @@
@@ -279,7 +262,7 @@ index b07aaf2..ccb7f93 100644
  
  impl AsInnerMut<fs_imp::OpenOptions> for OpenOptions {
 diff --git a/sgx_tstd/src/sys/sgxfs.rs b/sgx_tstd/src/sys/sgxfs.rs
-index 7b47471..9735193 100644
+index 7d6f24f3..0a6acef9 100644
 --- a/sgx_tstd/src/sys/sgxfs.rs
 +++ b/sgx_tstd/src/sys/sgxfs.rs
 @@ -15,7 +15,7 @@
@@ -291,7 +274,7 @@ index 7b47471..9735193 100644
  use sgx_trts::libc;
  use sgx_tprotected_fs::{self, SgxFileStream};
  use crate::os::unix::prelude::*;
-@@ -76,7 +76,7 @@ impl SgxFile {
+@@ -75,18 +75,29 @@ impl SgxFile {
          let path = cstr(path)?;
          let mode = opts.get_access_mode()?;
          let opts = CString::new(mode.as_bytes())?;
@@ -300,7 +283,6 @@ index 7b47471..9735193 100644
      }
  
      pub fn open_ex(path: &Path, opts: &OpenOptions, key: &sgx_key_128bit_t) -> io::Result<SgxFile> {
-@@ -84,12 +84,22 @@ impl SgxFile {
          let path = cstr(path)?;
          let mode = opts.get_access_mode()?;
          let opts = CString::new(mode.as_bytes())?;
@@ -309,9 +291,9 @@ index 7b47471..9735193 100644
      }
  
 -    pub fn open_c(path: &CStr, opts: &CStr, key: &sgx_key_128bit_t, auto: bool) -> io::Result<SgxFile> {
-+    pub fn open_integrity_only(path: &Path, opts: &OpenOptions) -> io::Result<SgxFile> {
- 
 -        let file = if auto == true {
++    pub fn open_integrity_only(path: &Path, opts: &OpenOptions) -> io::Result<SgxFile> {
++
 +        let path = cstr(path)?;
 +        let mode = opts.get_access_mode()?;
 +        let opts = CString::new(mode.as_bytes())?;
@@ -326,7 +308,7 @@ index 7b47471..9735193 100644
              SgxFileStream::open_auto_key(path, opts)
          } else {
              SgxFileStream::open(path, opts, key)
-@@ -222,6 +232,23 @@ impl SgxFile {
+@@ -213,6 +224,23 @@ impl SgxFile {
              }
          })
      }
@@ -350,34 +332,27 @@ index 7b47471..9735193 100644
  }
  
  pub fn remove(path: &Path) -> io::Result<()> {
-@@ -331,4 +358,4 @@ pub fn copy(from: &Path, to: &Path) -> io::Result<u64> {
-     let ret = io::copy(&mut reader, &mut writer)?;
-     fs::set_permissions(to, perm)?;
-     Ok(ret)
--}
-\ No newline at end of file
-+}
 diff --git a/sgx_types/src/function.rs b/sgx_types/src/function.rs
-index 5bb06e0..4e8c7bc 100644
+index 3c2db3a4..f96cd9e8 100644
 --- a/sgx_types/src/function.rs
 +++ b/sgx_types/src/function.rs
-@@ -609,6 +609,8 @@ extern {
+@@ -629,7 +629,10 @@ extern "C" {
  
-     pub fn sgx_fopen_auto_key(filename: * const c_char, mode: * const c_char) -> SGX_FILE;
+     pub fn sgx_fopen_auto_key(filename: *const c_char, mode: *const c_char) -> SGX_FILE;
  
+-    pub fn sgx_fwrite(ptr: *const c_void,
++
 +    pub fn sgx_fopen_integrity_only(filename: * const c_char, mode: * const c_char) -> SGX_FILE;
 +
-     pub fn sgx_fwrite(ptr: * const c_void,
++    pub fn sgx_fwrite(ptr: * const c_void,
                        size: size_t,
                        count: size_t,
-@@ -630,6 +632,7 @@ extern {
-     pub fn sgx_fexport_auto_key(filename: * const c_char, key: * mut sgx_key_128bit_t) -> int32_t;
-     pub fn sgx_fimport_auto_key(filename: * const c_char, key: * const sgx_key_128bit_t) -> int32_t;
+                       stream: SGX_FILE) -> size_t;
+@@ -650,6 +653,7 @@ extern "C" {
+     pub fn sgx_fexport_auto_key(filename: *const c_char, key: *mut sgx_key_128bit_t) -> int32_t;
+     pub fn sgx_fimport_auto_key(filename: *const c_char, key: *const sgx_key_128bit_t) -> int32_t;
      pub fn sgx_fclear_cache(stream: SGX_FILE) -> int32_t;
 +    pub fn sgx_fget_mac(stream: SGX_FILE, mac: * mut sgx_aes_gcm_128bit_tag_t) -> int32_t;
  }
  
  /* intel sgx sdk 2.0 */
--- 
-2.7.4
-
diff --git a/deps/sefs b/deps/sefs
index 12ddbb4f..1fbb9070 160000
--- a/deps/sefs
+++ b/deps/sefs
@@ -1 +1 @@
-Subproject commit 12ddbb4f6356a1496cf818b4f043bbe9931b8c96
+Subproject commit 1fbb90706e77a3fab46362abbcb1f4e3433cc261
diff --git a/src/libos/Cargo.lock b/src/libos/Cargo.lock
index 92ad1b22..e0c4f817 100644
--- a/src/libos/Cargo.lock
+++ b/src/libos/Cargo.lock
@@ -4,599 +4,600 @@
 name = "Occlum"
 version = "0.11.0"
 dependencies = [
- "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "bitvec 0.17.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "derive_builder 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "rcore-fs 0.1.0",
- "rcore-fs-mountfs 0.1.0",
- "rcore-fs-ramfs 0.1.0",
- "rcore-fs-sefs 0.1.0",
- "serde 1.0.104",
- "serde_json 1.0.40",
- "sgx_tcrypto 1.1.0",
- "sgx_trts 1.1.0",
- "sgx_tse 1.1.0",
- "sgx_tstd 1.1.0",
- "sgx_types 1.1.0",
- "xmas-elf 0.6.2",
+ "bitflags",
+ "bitvec",
+ "derive_builder",
+ "lazy_static",
+ "log",
+ "rcore-fs",
+ "rcore-fs-mountfs",
+ "rcore-fs-ramfs",
+ "rcore-fs-sefs",
+ "serde",
+ "serde_json",
+ "sgx_tcrypto",
+ "sgx_trts",
+ "sgx_tse",
+ "sgx_tstd",
+ "sgx_types",
+ "xmas-elf",
 ]
 
 [[package]]
 name = "autocfg"
 version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d49d90015b3c36167a20fe2810c5cd875ad504b39cff3d4eae7977e6b7c1cb2"
+
+[[package]]
+name = "autocfg"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f8aac770f1885fd7e387acedd76065302551364496e46b3dd00860b2f8359b9d"
 
 [[package]]
 name = "bitflags"
 version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
 
 [[package]]
 name = "bitvec"
 version = "0.17.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "41262f11d771fd4a61aa3ce019fca363b4b6c282fca9da2a31186d3965a47a5c"
 dependencies = [
- "either 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "radium 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "either",
+ "radium",
 ]
 
 [[package]]
 name = "cc"
-version = "1.0.50"
+version = "1.0.52"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c3d87b23d6a92cd03af510a5ade527033f6aa6fa92161e2d5863a907d4c5e31d"
 
 [[package]]
 name = "cfg-if"
 version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
 
 [[package]]
 name = "cloudabi"
 version = "0.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ddfc5b9aa5d4507acaf872de71051dfd0e309860e88966e1051e462a077aac4f"
 dependencies = [
- "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags",
 ]
 
 [[package]]
 name = "darling"
 version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fcfbcb0c5961907597a7d1148e3af036268f2b773886b8bb3eeb1e1281d3d3d6"
 dependencies = [
- "darling_core 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "darling_macro 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "darling_core",
+ "darling_macro",
 ]
 
 [[package]]
 name = "darling_core"
 version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6afc018370c3bff3eb51f89256a6bdb18b4fdcda72d577982a14954a7a0b402c"
 dependencies = [
- "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "ident_case 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "strsim 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.44 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fnv",
+ "ident_case",
+ "proc-macro2 0.4.30",
+ "quote 0.6.13",
+ "strsim",
+ "syn 0.15.44",
 ]
 
 [[package]]
 name = "darling_macro"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c6d8dac1c6f1d29a41c4712b4400f878cb4fcc4c7628f298dd75038e024998d1"
 dependencies = [
- "darling_core 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.44 (registry+https://github.com/rust-lang/crates.io-index)",
+ "darling_core",
+ "quote 0.6.13",
+ "syn 0.15.44",
 ]
 
 [[package]]
 name = "derive_builder"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3ac53fa6a3cda160df823a9346442525dcaf1e171999a1cf23e67067e4fd64d4"
 dependencies = [
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- "quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.44 (registry+https://github.com/rust-lang/crates.io-index)",
+ "darling",
+ "derive_builder_core",
+ "proc-macro2 0.4.30",
+ "quote 0.6.13",
+ "syn 0.15.44",
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- "quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.44 (registry+https://github.com/rust-lang/crates.io-index)",
+ "darling",
+ "proc-macro2 0.4.30",
+ "quote 0.6.13",
+ "syn 0.15.44",
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 [[package]]
 name = "either"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
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+checksum = "2fad85553e09a6f881f739c29f0b00b0f01357c743266d478b68951ce23285f3"
 
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 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a06f77d526c1a601b7c4cdd98f54b5eaabffc14d5f2f0296febdc7f357c6d3ba"
+
+[[package]]
+name = "hashbrown_tstd"
+version = "0.7.1"
+dependencies = [
+ "autocfg 1.0.0",
+]
 
 [[package]]
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+checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
 
 [[package]]
 name = "itoa"
 version = "0.4.5"
 dependencies = [
- "sgx_tstd 1.1.0",
+ "sgx_tstd",
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 [[package]]
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 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 dependencies = [
- "spin 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
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-version = "0.2.66"
+version = "0.2.69"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "99e85c08494b21a9054e7fe1374a732aeadaff3980b6990b94bfd3a70f690005"
 
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 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14b6052be84e6b71ab17edffc2eeabf5c2c3ae1fdb464aae35ac50c67a44e1f7"
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- "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
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+checksum = "cf3d2011ab5c909338f7887f4fc896d35932e29146c12c8d01da6b22a80ba759"
 dependencies = [
- "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.1.0",
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 [[package]]
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-version = "1.0.7"
+version = "1.0.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
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 dependencies = [
- "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
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 version = "0.6.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6ce23b6b870e8f94f81fb0a363d65d86675884b34a09043c81e5562f11c1f8e1"
 dependencies = [
- "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.30",
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 [[package]]
 name = "quote"
-version = "1.0.2"
+version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4c1f4b0efa5fc5e8ceb705136bfee52cfdb6a4e3509f770b478cd6ed434232a7"
 dependencies = [
- "proc-macro2 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
 name = "radium"
 version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "def50a86306165861203e7f84ecffbbdfdea79f0e51039b33de1e952358c47ac"
 
 [[package]]
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 version = "0.6.5"
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+checksum = "6d71dacdc3c88c1fde3885a3be3fbab9f35724e6ce99467f7d9c5026132184ca"
 dependencies = [
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-"checksum rand_core 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9c33a3c44ca05fa6f1807d8e6743f3824e8509beca625669633be0acbdf509dc"
-"checksum rand_hc 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7b40677c7be09ae76218dc623efbf7b18e34bced3f38883af07bb75630a21bc4"
-"checksum rand_isaac 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "ded997c9d5f13925be2a6fd7e66bf1872597f759fd9dd93513dd7e92e5a5ee08"
-"checksum rand_jitter 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "1166d5c91dc97b88d1decc3285bb0a99ed84b05cfd0bc2341bdf2d43fc41e39b"
-"checksum rand_os 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "7b75f676a1e053fc562eafbb47838d67c84801e38fc1ba459e8f180deabd5071"
-"checksum rand_pcg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "abf9b09b01790cfe0364f52bf32995ea3c39f4d2dd011eac241d2914146d0b44"
-"checksum rand_xorshift 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "cbf7e9e623549b0e21f6e97cf8ecf247c1a8fd2e8a992ae265314300b2455d5c"
-"checksum rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "678054eb77286b51581ba43620cc911abf02758c91f93f479767aed0f90458b2"
-"checksum ryu 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "bfa8506c1de11c9c4e4c38863ccbe02a305c8188e85a05a784c9e11e1c3910c8"
-"checksum spin 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6e63cff320ae2c57904679ba7cb63280a3dc4613885beafb148ee7bf9aa9042d"
-"checksum static_assertions 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "7f3eb36b47e512f8f1c9e3d10c2c1965bc992bd9cdb024fa581e2194501c83d3"
-"checksum strsim 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bb4f380125926a99e52bc279241539c018323fab05ad6368b56f93d9369ff550"
-"checksum syn 0.15.44 (registry+https://github.com/rust-lang/crates.io-index)" = "9ca4b3b69a77cbe1ffc9e198781b7acb0c7365a883670e8f1c1bc66fba79a5c5"
-"checksum syn 1.0.13 (registry+https://github.com/rust-lang/crates.io-index)" = "1e4ff033220a41d1a57d8125eab57bf5263783dfdcc18688b1dacc6ce9651ef8"
-"checksum unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "fc72304796d0818e357ead4e000d19c9c174ab23dc11093ac919054d20a6a7fc"
-"checksum unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "826e7639553986605ec5979c7dd957c7895e93eabed50ab2ffa7f6128a75097c"
-"checksum uuid 0.7.4 (registry+https://github.com/rust-lang/crates.io-index)" = "90dbc611eb48397705a6b0f6e917da23ae517e4d127123d2cf7674206627d32a"
-"checksum winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)" = "8093091eeb260906a183e6ae1abdba2ef5ef2257a21801128899c3fc699229c6"
-"checksum winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
-"checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
-"checksum zero 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "5f1bc8a6b2005884962297587045002d8cfb8dcec9db332f4ca216ddc5de82c5"
+checksum = "5f1bc8a6b2005884962297587045002d8cfb8dcec9db332f4ca216ddc5de82c5"
diff --git a/src/libos/Makefile b/src/libos/Makefile
index cca02cfa..f0afd430 100644
--- a/src/libos/Makefile
+++ b/src/libos/Makefile
@@ -52,8 +52,6 @@ ONLY_REBUILD_BUILTIN ?= 0
 LIBOS_SO := $(BUILD_DIR)/lib/libocclum-libos.so
 LIBOS_CORE_A := $(BUILD_DIR)/lib/libocclum-libos-core.a
 LIBOS_CORE_RS_A := $(BUILD_DIR)/lib/libocclum_libos_core_rs.a
-# The dependent libraries
-LIBCOMPILER_RT_PATCH_A := $(BUILD_DIR)/lib/libcompiler-rt-patch.a
 
 # All source code
 RUST_SRCS := $(wildcard src/*.rs src/*/*.rs src/*/*/*.rs src/*/*/*/*.rs src/*/*/*/*/*.rs)
@@ -90,7 +88,7 @@ C_FLAGS += -DOCCLUM_BUILTIN_VM_USER_SPACE_SIZE='($(OCCLUM_BUILTIN_VM_USER_SPACE_
 endif
 
 _Other_Link_Flags := -L$(RUST_SGX_SDK_DIR)/compiler-rt/ -L$(BUILD_DIR)/lib
-_Other_Enclave_Libs := -lcompiler-rt-patch -locclum-libos-core -lsgx_tprotected_fs
+_Other_Enclave_Libs := -locclum-libos-core -lsgx_tprotected_fs
 LINK_FLAGS := $(SGX_LFLAGS_T)
 
 .PHONY: all clean
@@ -146,15 +144,10 @@ $(BUILD_DIR)/src/libos/%.o: %.S
 	@$(CC) $(C_FLAGS) -c $< -o $@
 	@echo "AS <= $@"
 
-$(LIBCOMPILER_RT_PATCH_A):
-	@$(MAKE) --no-print-directory -C $(RUST_SGX_SDK_DIR)/compiler-rt/ > /dev/null
-	@cp $(RUST_SGX_SDK_DIR)/compiler-rt/libcompiler-rt-patch.a $(LIBCOMPILER_RT_PATCH_A)
-	@echo "GEN <= $@"
-
 clean-builtin:
 	@-$(RM) -f $(BUILTIN_C_OBJS)
 
 clean: clean-builtin
 	@-$(RM) -f $(LIBOS_SO) $(LIBOS_CORE_A) $(LIBOS_CORE_RS_A) \
-		$(LIBCOMPILER_RT_PATCH_A) $(EDL_C_OBJS) $(EDL_C_SRCS) $(C_OBJS) $(CXX_OBJS) $(S_OBJS)
+		$(EDL_C_OBJS) $(EDL_C_SRCS) $(C_OBJS) $(CXX_OBJS) $(S_OBJS)
 	@-$(RM) -rf $(RUST_TARGET_DIR)
diff --git a/src/libos/rust-toolchain b/src/libos/rust-toolchain
index 7ff88f6e..4e74872f 100644
--- a/src/libos/rust-toolchain
+++ b/src/libos/rust-toolchain
@@ -1 +1 @@
-nightly-2019-11-25
+nightly-2020-04-07
diff --git a/src/libos/src/exception/mod.rs b/src/libos/src/exception/mod.rs
index b7b240a6..544bd75f 100644
--- a/src/libos/src/exception/mod.rs
+++ b/src/libos/src/exception/mod.rs
@@ -23,7 +23,7 @@ pub fn register_exception_handlers() {
 }
 
 #[no_mangle]
-extern "C" fn handle_exception(info: *mut sgx_exception_info_t) -> u32 {
+extern "C" fn handle_exception(info: *mut sgx_exception_info_t) -> i32 {
     extern "C" {
         fn __occlum_syscall_c_abi(num: u32, info: *mut sgx_exception_info_t) -> u32;
     }
diff --git a/src/libos/src/fs/stdio.rs b/src/libos/src/fs/stdio.rs
index 8727917a..9c948ba4 100644
--- a/src/libos/src/fs/stdio.rs
+++ b/src/libos/src/fs/stdio.rs
@@ -180,7 +180,7 @@ impl File for StdoutFile {
         }
 
         let cmd_bits = cmd.cmd_num() as c_int;
-        let cmd_arg_ptr = cmd.arg_ptr() as *const c_int;
+        let cmd_arg_ptr = cmd.arg_ptr() as *mut c_int;
         let host_stdout_fd = self.get_host_fd() as i32;
         try_libc!(libc::ocall::ioctl_arg1(
             host_stdout_fd,
@@ -321,7 +321,7 @@ impl File for StdinFile {
         }
 
         let cmd_bits = cmd.cmd_num() as c_int;
-        let cmd_arg_ptr = cmd.arg_ptr() as *const c_int;
+        let cmd_arg_ptr = cmd.arg_ptr() as *mut c_int;
         let host_stdin_fd = self.get_host_fd() as i32;
         try_libc!(libc::ocall::ioctl_arg1(
             host_stdin_fd,
diff --git a/src/libos/src/net/socket_file/mod.rs b/src/libos/src/net/socket_file/mod.rs
index c9cc8c91..3740cbb0 100644
--- a/src/libos/src/net/socket_file/mod.rs
+++ b/src/libos/src/net/socket_file/mod.rs
@@ -108,7 +108,7 @@ impl File for SocketFile {
 
     fn ioctl(&self, cmd: &mut IoctlCmd) -> Result<()> {
         let cmd_num = cmd.cmd_num() as c_int;
-        let cmd_arg_ptr = cmd.arg_ptr() as *const c_int;
+        let cmd_arg_ptr = cmd.arg_ptr() as *mut c_int;
         try_libc!(libc::ocall::ioctl_arg1(self.fd(), cmd_num, cmd_arg_ptr));
         // FIXME: add sanity checks for results returned for socket-related ioctls
         cmd.validate_arg_val()?;
diff --git a/src/libos/src/untrusted/alloc.rs b/src/libos/src/untrusted/alloc.rs
index 1645e749..0f0f6d46 100644
--- a/src/libos/src/untrusted/alloc.rs
+++ b/src/libos/src/untrusted/alloc.rs
@@ -1,14 +1,18 @@
 use super::*;
-use std::alloc::{Alloc, AllocErr, Layout};
-use std::ptr::{self, NonNull};
+use std::alloc::{AllocErr, AllocInit, AllocRef, Layout, MemoryBlock};
+use std::ptr::{self, write_bytes, NonNull};
 
 /// The global memory allocator for untrusted memory
 pub static mut UNTRUSTED_ALLOC: UntrustedAlloc = UntrustedAlloc;
 
 pub struct UntrustedAlloc;
 
-unsafe impl Alloc for UntrustedAlloc {
-    unsafe fn alloc(&mut self, layout: Layout) -> std::result::Result<NonNull<u8>, AllocErr> {
+unsafe impl AllocRef for UntrustedAlloc {
+    fn alloc(
+        &mut self,
+        layout: Layout,
+        init: AllocInit,
+    ) -> std::result::Result<MemoryBlock, AllocErr> {
         if layout.size() == 0 {
             return Err(AllocErr);
         }
@@ -29,6 +33,12 @@ unsafe impl Alloc for UntrustedAlloc {
             return Err(AllocErr);
         }
 
+        if init == AllocInit::Zeroed {
+            unsafe {
+                write_bytes(mem_ptr, 0, layout.size());
+            }
+        }
+
         // Sanity checks
         // Post-condition 1: alignment
         debug_assert!(mem_ptr as usize % layout.align() == 0);
@@ -37,7 +47,10 @@ unsafe impl Alloc for UntrustedAlloc {
             mem_ptr as *const u8,
             layout.size()
         ));
-        Ok(NonNull::new(mem_ptr).unwrap())
+        Ok(MemoryBlock {
+            ptr: NonNull::new(mem_ptr).unwrap(),
+            size: layout.size(),
+        })
     }
 
     unsafe fn dealloc(&mut self, ptr: NonNull<u8>, layout: Layout) {
diff --git a/src/libos/src/untrusted/slice_alloc.rs b/src/libos/src/untrusted/slice_alloc.rs
index e4e33c98..3e70bf62 100644
--- a/src/libos/src/untrusted/slice_alloc.rs
+++ b/src/libos/src/untrusted/slice_alloc.rs
@@ -1,5 +1,5 @@
 use super::*;
-use std::alloc::{Alloc, AllocErr, Layout};
+use std::alloc::{AllocErr, AllocInit, AllocRef, Layout, MemoryBlock};
 use std::ptr::NonNull;
 use std::sync::atomic::{AtomicUsize, Ordering};
 
@@ -26,7 +26,13 @@ impl UntrustedSliceAlloc {
         }
 
         let layout = Layout::from_size_align(buf_size, 1)?;
-        let buf_ptr = unsafe { UNTRUSTED_ALLOC.alloc(layout)?.as_ptr() };
+        let buf_ptr = unsafe {
+            UNTRUSTED_ALLOC
+                .alloc(layout, AllocInit::Uninitialized)?
+                .ptr
+                .as_ptr()
+        };
+
         let buf_pos = AtomicUsize::new(0);
         Ok(Self {
             buf_ptr,
diff --git a/tools/docker/Dockerfile.centos7.2 b/tools/docker/Dockerfile.centos7.2
index e9e32bae..64753989 100644
--- a/tools/docker/Dockerfile.centos7.2
+++ b/tools/docker/Dockerfile.centos7.2
@@ -52,16 +52,20 @@ RUN wget http://www.etallen.com/cpuid/cpuid-20200211.x86_64.tar.gz && \
 
 # Install SGX SDK
 WORKDIR /tmp
-RUN git clone -b sgx_2.7.1_for_occlum https://github.com/occlum/linux-sgx && \
+RUN git clone -b sgx_2.9.1_for_occlum https://github.com/occlum/linux-sgx && \
     cd linux-sgx && \
     ./download_prebuilt.sh && \
+    cp ./external/toolset/as /usr/local/bin/ && \
+    cp ./external/toolset/ld /usr/local/bin/ && \
+    cp ./external/toolset/ld.gold /usr/local/bin/ && \
+    cp ./external/toolset/objdump /usr/local/bin/ && \
     ./compile_and_install.sh && \
     echo 'source /opt/intel/sgxsdk/environment' >> /root/.bashrc && \
     rm -rf /tmp/linux-sgx
 
 # Install Rust
 ENV PATH="/root/.cargo/bin:$PATH"
-ENV OCCLUM_RUST_VERSION=nightly-2019-11-25
+ENV OCCLUM_RUST_VERSION=nightly-2020-04-07
 RUN curl https://sh.rustup.rs -sSf | \
         sh -s -- --default-toolchain ${OCCLUM_RUST_VERSION} -y && \
     rm -rf /root/.cargo/registry && rm -rf /root/.cargo/git && \
diff --git a/tools/docker/Dockerfile.ubuntu16.04 b/tools/docker/Dockerfile.ubuntu16.04
index f7c55203..50aea1bc 100644
--- a/tools/docker/Dockerfile.ubuntu16.04
+++ b/tools/docker/Dockerfile.ubuntu16.04
@@ -52,16 +52,20 @@ RUN wget http://www.etallen.com/cpuid/cpuid-20200211.x86_64.tar.gz && \
 
 # Install SGX SDK
 WORKDIR /tmp
-RUN git clone -b sgx_2.7.1_for_occlum https://github.com/occlum/linux-sgx && \
+RUN git clone -b sgx_2.9.1_for_occlum https://github.com/occlum/linux-sgx && \
     cd linux-sgx && \
     ./download_prebuilt.sh && \
+    cp ./external/toolset/as /usr/local/bin/ && \
+    cp ./external/toolset/ld /usr/local/bin/ && \
+    cp ./external/toolset/ld.gold /usr/local/bin/ && \
+    cp ./external/toolset/objdump /usr/local/bin/ && \
     ./compile_and_install.sh && \
     echo 'source /opt/intel/sgxsdk/environment' >> /root/.bashrc && \
     rm -rf /tmp/linux-sgx
 
 # Install Rust
 ENV PATH="/root/.cargo/bin:$PATH"
-ENV OCCLUM_RUST_VERSION=nightly-2019-11-25
+ENV OCCLUM_RUST_VERSION=nightly-2020-04-07
 RUN curl https://sh.rustup.rs -sSf | \
         sh -s -- --default-toolchain ${OCCLUM_RUST_VERSION} -y && \
     rm -rf /root/.cargo/registry && rm -rf /root/.cargo/git && \
diff --git a/tools/docker/Dockerfile.ubuntu18.04 b/tools/docker/Dockerfile.ubuntu18.04
index a67a1c7d..b6b4f79a 100644
--- a/tools/docker/Dockerfile.ubuntu18.04
+++ b/tools/docker/Dockerfile.ubuntu18.04
@@ -53,17 +53,21 @@ RUN wget http://www.etallen.com/cpuid/cpuid-20200211.x86_64.tar.gz && \
 
 # Install SGX SDK
 WORKDIR /tmp
-RUN git clone -b sgx_2.7.1_for_occlum https://github.com/occlum/linux-sgx && \
+RUN git clone -b sgx_2.9.1_for_occlum https://github.com/occlum/linux-sgx && \
     mkdir /etc/init && \
     cd linux-sgx && \
     ./download_prebuilt.sh && \
+    cp ./external/toolset/as /usr/local/bin/ && \
+    cp ./external/toolset/ld /usr/local/bin/ && \
+    cp ./external/toolset/ld.gold /usr/local/bin/ && \
+    cp ./external/toolset/objdump /usr/local/bin/ && \  
     ./compile_and_install.sh && \
     echo 'source /opt/intel/sgxsdk/environment' >> /root/.bashrc && \
     rm -rf /tmp/linux-sgx
 
 # Install Rust
 ENV PATH="/root/.cargo/bin:$PATH"
-ENV OCCLUM_RUST_VERSION=nightly-2019-11-25
+ENV OCCLUM_RUST_VERSION=nightly-2020-04-07
 RUN curl https://sh.rustup.rs -sSf | \
         sh -s -- --default-toolchain ${OCCLUM_RUST_VERSION} -y && \
     rm -rf /root/.cargo/registry && rm -rf /root/.cargo/git && \
diff --git a/tools/occlum b/tools/occlum
index 5650716e..9ff5dc10 100755
--- a/tools/occlum
+++ b/tools/occlum
@@ -166,7 +166,6 @@ cmd_build() {
     cp "$occlum_dir/$build_dir/bin/occlum-run" build/bin/
     mkdir -p build/lib
     cp "$occlum_dir/$build_dir/lib/libocclum-libos-core.a" build/lib/
-    cp "$occlum_dir/$build_dir/lib/libcompiler-rt-patch.a" build/lib/
     cp "$occlum_dir/$build_dir/lib/libocclum-pal.so" build/lib/
     mkdir -p build/src/libos/src/builtin