19 questions
1
vote
1
answer
601
views
GNU compiler memory sanitizer is not available [duplicate]
When I try to build my c++ project with memory sanitizer using the CMake sanitizers modules here, I get this warning:
MemorySanitizer is not available for GNU compiler.
Although when I searched on ...
- 51
3
votes
1
answer
179
views
Does `string s = std::to_string(1) + std::to_string(2)` use uninitialized memory
The question is, does the following snippet use uninitialized memory, as reported by Google's MemorySanitizer? Or is it a false positive?:
main.cpp:
#include <string>
#include <iostream>
...
- 507
1
vote
1
answer
2k
views
How do I tell clang memory sanitizer to ignore data from certain libraries?
For example I'd like to ignore sqlite and zlib because I know they're well tested. I grabbed the zpipe.c example and built it like this. Keep in mind I'm using -lz and not building zlib myself. I'm ...
- 241
1
vote
2
answers
114
views
MemorySanitzer warns of use of undefined memory in `struct stat`; I do check the `stat` return value, though
struct stat st;
if (stat(python_pkgdir, &st)) {
qd_error_errno(errno, "Cannot find Python library path '%s'", python_pkgdir);
return NULL;
} else ...
- 28.5k
1
vote
1
answer
2k
views
Clang sanitizers missing a read from uninitialized memory
I have the following code, that I am confident reads from garbage memory, but clang sanitizers do not complain.
Is there something I can do to make them trigger or I should just accept this as ...
- 29.9k
3
votes
2
answers
1k
views
Why does the memory-sanitizer report use of an uninitialized value for std::map?
I'm using manjaro linux on x86-64. Memory-sanitizer in clang version 10.0.1 reported a use of uninitialized value error in std::map, which quite surprised me. Did I do something wrong?
$ cat test.cpp
...
- 167
1
vote
0
answers
227
views
Boost undefined symbol issue while linking with static library with memory sanitizer
I am getting below error while building static library uhd-types and linking with boost libraries v1.74 with memory sanitizer flag -fsanitize=memory.
[ 63%] Built target uhd-types
[ 65%] Linking CXX ...
- 11
3
votes
0
answers
254
views
Clang memory sanitizer bug with SSE intrinsics
Here is a piece of code that generates an internal compiler error if I compile and run it with clang having memory sanitizer enabled.
It mainly just puts some data into an SSE register and calls a ...
0
votes
1
answer
255
views
Does enabling LLVM's MemorySanitizer change the ABI of libraries
The LLVM projects MemorySanitizer has a somewhat difficult to satisfy constraint that all system libraries must also be built with MemorySanitizer.
I've been thinking about some ways to enable MSAN ...
- 12.7k
1
vote
0
answers
612
views
cannot build memory sanitizer instrumented libc++ that link against only compile-rt (no libgcc)?
I want to use c++ memory sanitizer(msan) on a code repo with llvm toolchain (libc++, libunwind, compiler-rt, clang ...). so the first thing i need to do is to build msan-instrumented libc++.
From ...
- 33
2
votes
0
answers
1k
views
clang sanitize-blacklist is not ignoring a function
I am using clang 7.0.1-6 with -fsatize=memory and -fsanitize-blacklist to ignore unitialized memory in libc.
Unfortunately it seems that msan does not ignore cap_init, or it's descendants.
$ cat /...
- 672
2
votes
1
answer
291
views
Memory sanitizer error: clang5 + msan + fwrite of structs with padding bytes
Minimum example:
#include <fstream>
struct TFoo
{
bool Field1_ = false;
uint64_t Field2_ = 0;
};
int main() {
TFoo Foo_{};
const char* filename = "text.txt";
std::ofstream ...
- 8,391
2
votes
0
answers
179
views
Memory Sanitizer use-of-uninitialized-value with ifstream [duplicate]
Here's a minimal example to reproduce -
#include <iostream>
#include <string>
#include <fstream>
using namespace std;
int main() {
ifstream names("lol.txt");
if(!names) {
...
- 7,504
1
vote
2
answers
6k
views
clang++ memory sanitizer reports use-of-uninitialized-value
This code is taken from IncludeOS github page. I modified it a bit so that it compiles without other header files. find function from IncludeOS is a bit too verbose, so I want to simplify it. But ...
- 1,248
55
votes
2
answers
39k
views
Memory/Address Sanitizer vs Valgrind
I want some tool to diagnose use-after-free bugs and uninitialized bugs. I am considering Sanitizer(Memory and/or Address) and Valgrind. But I have very little idea about their advantages and ...
- 723
0
votes
1
answer
1k
views
Using Memory Sanitizer instrumented libc++
I have built an instrumented libc++ as described here. I have set the flags as the above site suggests:
MSAN_CFLAGS="-fsanitize=memory -stdlib=libc++ -L/path_to/llvm-build-msan/lib -lc++abi -I/...
- 3,686
3
votes
1
answer
3k
views
How to make MemorySanitizer not stop after one error
Clang's documentation says that "By default, MemorySanitizer exits on the first detected error."
Does somebody know how to make MemorySanitizer not to stop on errors?
The above sentence suggests that ...
- 3,686
4
votes
2
answers
3k
views
How can I practically use AddressSanitizer and MemorySanitizer?
AddressSanitizer and MemorySanitizer are very useful tools, but they require that the whole program be appropriately instrumented. (At least, for the Clang version of AddressSanitizer; see here in the ...
- 58.2k
29
votes
3
answers
6k
views
Using memory sanitizer with libstdc++
I wish to use the -fsanitize=memory flag in clang to analyse a program like the following:
#include <string>
#include <iostream>
#include <fstream>
using namespace std;
void ...
- 5,138