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Memory Sanitizer

由 |▌冷眼眸甩不掉的悲伤 提交于 2021-01-27 06:08:45
问题 I am playing around with Memory Sanitizer with Clang 3.7.0 on Ubuntu 14.04. The following code does work perfectly: #include <cstdio> int main() { double ans; printf("Hello World: %f\n", ans); return 0; } when compiled with clang++ -g -O1 -fsanitize=memory -fsanitize-memory-track-origins=2 -fomit-frame-pointer sanitize.cpp -o sanitize I was expecting an error. Doesn't Memory Sanitizer catch the fact that ans was not initialized? Thanks for your help. 回答1: From the clang santitizer

clang memory sanitizer; how to make it print source line numbers

由 谁说我不能喝 提交于 2019-12-12 07:33:00
问题 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: MemorySanitizer: use-of-uninitialized-value #0 0x7fe7602d4a51 (/home/matiu/projects/json++11/build/tests+0x106a51) #1 0x7fe7602dfca6 (/home/matiu/projects/json++11/build/tests+0x111ca6) ... #31 0x7fe75edbaec4 (/lib/x86_64-linux-gnu/libc.so.6+0x21ec4) #32

Using memory sanitizer with libstdc++

由 空扰寡人 提交于 2019-11-28 08:56:53
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++

由 ◇◆丶佛笑我妖孽 提交于 2019-11-27 02:38:10
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 _
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