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Questions tagged [msan]

Memory sanitizer (msan) is a fast memory checker for Clang and GCC. Various computations will be instrumented to detect memory issues at runtime.

Memory sanitizer (msan) is a fast memory checker for C and C++ programs and enabled at compile time (but the checks are performed at runtime). It is available since Clang 3.3.

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Using memory sanitizer with libstdc++

I wish to use the -fsanitize=memory flag in clang to analyse a program like the following: #include #include #include using namespace std; void writeToFile(){ ofstream o; o.open("dum"); o<<"test"<
soandos
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clang memory sanitizer; how to make it print source line numbers

I'm compiling my program with clang++ -fsanitize=memory -fsanitize-memory-track-origins -fno-omit-frame-pointer -g -O0 and when I run it, the output is: matiu@matiu-laptop:~/projects/json++11/build$ ./tests .......==10534== WARNING:…
matiu
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Memory Sanitizer

I am playing around with Memory Sanitizer with Clang 3.7.0 on Ubuntu 14.04. The following code does work perfectly: #include int main() { double ans; printf("Hello World: %f\n", ans); return 0; } when compiled with clang++ -g -O1…
InsideLoop
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Memory sanitizer reports use-of-uninitialized-value in global object construction

I get use-of-uninitialized-value warning while executing the following program compiled with clang++-9 -fsanitize=memory: #include class msan_test { std::map m_map; public: msan_test() { m_map.insert(std::make_pair(1,…
user12852628
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Building libc++ with MemorySanitizer instrumentation fails due to MemorySanitizer warning

I'm trying to build libc++ with MemorySanitizer instrumentation so that I can build my own projects with MemorySanitizer. I am using Clang 8.01 on Ubuntu 16.04. I followed the instructions given here, but the build initially failed with a linker…
Daniel
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Unable to reproduce memory sanitization results from the project's example project

I'm getting exactly the same results from centos7, clang-3.6.1 built from source using a fedora rpm specfile. Ubuntu 14.04, clang-3.4 Using the instructions from the wiki here https://github.com/google/sanitizers/wiki/MemorySanitizerLibcxxHowTo as…
Hal
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How to determine when -fsanitize=memory is in use?

I want to clear a false positive on FD_ZERO and FD_SET when the memory sanitizer is in use. Clearing it is somewhat easy: #include ... __msan_unpoison(&readfds, sizeof(readfds)); __msan_unpoison(&writefds,…
jww
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Why does clang MemorySanitizer produce error in fstream open?

I am trying to integrate Memory Sanitizer into my project. And following code raise an use-of-uninitialized-value error: #include int main () { std::ifstream ifs; ifs.open ("test.txt", std::ifstream::in); char c = ifs.get(); //…
Павел Романюк
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Memory sanitizer false positive on centos 7 but not on other platform

my test code is the following: #include #include int main() { std::string mylongstring("This is a test string"); std::cout << mylongstring << std::endl; } and I compile with the latest clang, using a GCC 7.2…
hassec
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Using -fsanitize=memory with clang on linux with libstdc++

With the system supplied libstdc++ the clang memory sanitizer is basically unusable due to false positives - eg the code below fails. #include #include int main(int argc, char **argv) { double foo = 1.2; std::ofstream…
Hal
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Uninitialized memory bug using the zip.h library in WSL Ubuntu 22.04

I was writing some code on C that opens an encrypted zip file and tries to read its contents. The program works well, but when I was reviewing the code with some tools to make sure there were no leaks or issues, I found a strange issue when…
CodingQuestions
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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 MemorySanitizerLibcxxHowTo, i need to build libc++…
JohnNil
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Is there anyway to debug "go test -msan" command?

I've recently looking for any way to debug "go test -msan". I am facing with a core-dump (Segmentation Fault) when pipeline executing this command and I need more detailed background informations about what is going on. So, I need to a way to debug…
alimertkoc
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SDL2 SDL_Init function triggers memory sanitizer error (relying on uninitialized data)

clang -g -fsanitize=memory -Wconversion -Wsign-conversion -Wextra -Wall -Werror -pedantic -I/usr/include/SDL2 -lSDL2_image -lSDL2_gfx -lSDL2 -lSDL2_ttf -lc -lm ./deps/**/*.c ./src/*.c ./src/**/*.c -o ./bin/output ./bin/output Uninitialized bytes…
user7847084
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clang memory sanitizer (linux) does not report errors

I'm attempting to produce clang memory sanitizer errors on a linux platform with a toy program. I haven't been able to produce any errors with what I believe is a correct platform / compilation / execution. A simple description of the…
manabear
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