MEDS: Enhancing Memory Error Detection for Large-Scale Applications
Prerequisites
cmakeandclang
Build MEDS supporting compiler
$ make
Build Using Docker
# build docker image
$ docker build -t meds .
# run docker image
$ docker run --cap-add=SYS_PTRACE -it meds /bin/bash
Testing MEDS
-
MEDS's testing runs original ASAN's testcases as well as MEDS specific testcases.
- Copied ASAN's testcases in
llvm/projects/compiler-rt/test/meds/TestCases/ASan - MEDS specific testcases in
llvm/projects/compiler-rt/test/meds/TestCases/Meds
- Copied ASAN's testcases in
-
To run the test,
$ make test
Testing Time: 30.70s
Expected Passes : 183
Expected Failures : 1
Unsupported Tests : 50
Build applications with MEDS heap allocation and ASan stack and global
- Given a test program
test.cc,
$ cat > test.cc
int main(int argc, char **argv) {
int *a = new int[10];
a[argc * 10] = 1;
return 0;
}
test.cccan be built using the option,-fsanitize=meds.
$ build/bin/clang++ -fsanitize=meds test.cc -o test
$ ./test
==90589==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x43fff67eb078 at pc 0x0000004f926d bp 0x7fffffffe440 sp 0x7fffffffe438
WRITE of size 4 at 0x43fff67eb078 thread T0
#0 0x4f926c in main (/home/wookhyun/release/meds-release/a.out+0x4f926c)
#1 0x7ffff6b5c82f in __libc_start_main /build/glibc-bfm8X4/glibc-2.23/csu/../csu/libc-start.c:291
#2 0x419cb8 in _start (/home/wookhyun/release/meds-release/a.out+0x419cb8)
Address 0x43fff67eb078 is a wild pointer.
SUMMARY: AddressSanitizer: heap-buffer-overflow (/home/wookhyun/release/meds-release/a.out+0x4f926c) in main
Shadow bytes around the buggy address:
0x08807ecf55b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x08807ecf55c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x08807ecf55d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x08807ecf55e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x08807ecf55f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x08807ecf5600: fa fa fa fa fa fa fa fa fa fa 00 00 00 00 00[fa]
0x08807ecf5610: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x08807ecf5620: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x08807ecf5630: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x08807ecf5640: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x08807ecf5650: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==90589==ABORTING
Options
-
-fsanitize=meds: Enable heap protection using MEDS (stack and global are protected using ASAN) -
-mllvm -meds-stack=1: Enable stack protection using MEDS -
-mllvm -meds-global=1 -mcmodel=large: Enable global protection using MEDS- This also requires
--emit-relocsinLDFLAGS
- This also requires
-
Example: to protect heap/stack using MEDS and global using ASAN
$ clang -fsanitize=meds -mllvm -meds-stack=1 test.c -o test
- Example: to protect heap/global using MEDS and stack using ASAN
$ clang -fsanitize=meds -mllvm -meds-global=1 -mcmodel=large -Wl,-emit-relocs test.c -o test
- Example: to protect heap/stack/global using MEDS
$ clang -fsanitize=meds -mllvm -meds-stack=1 -mllvm -meds-global=1 -mcmodel=large -Wl,--emit-relocs
Contributors
- Wookhyun Han ([email protected])
- Byunggil Joe ([email protected])
- Byoungyougn Lee ([email protected])
- Chengyu Song ([email protected])
- Insik Shin ([email protected])
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