memory-sanitizer | 易学教程

Memory/Address Sanitizer vs Valgrind

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问题 I want some tool to diagnose user-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 disadvantages. Can anyone tell the main features, differences and pros/cons of Sanitizer and Valgrind? Edit: I found some of comparisons like: Valgrind uses DBI(dynamic binary instrumentation) and Sanitizer uses CTI(compile-time instrumentation). Valgrind makes the program much slower(20x) whether

Using memory sanitizer with libstdc++

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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 writeToFile(){ ofstream o; o.open("dum"); o<<"test"<<endl; //The error is here. //It does not matter if the file is opened this way, //or with o("dum"); o.close(); } int main(){ writeToFile(); } As far as I know, this program is correct, but when I use clang++ san.cpp -fsanitize=memory It fails (at runtime) with: UMR in __interceptor_write at offset 0 inside [0x64800000e000, +5) ==9685== WARNING: MemorySanitizer: use-of

Using memory sanitizer with libstdc++

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问题 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 writeToFile(){ ofstream o; o.open("dum"); o<<"test"<<endl; //The error is here. //It does not matter if the file is opened this way, //or with o("dum"); o.close(); } int main(){ writeToFile(); } As far as I know, this program is correct, but when I use clang++ san.cpp -fsanitize=memory It fails (at runtime) with: UMR in _