为二进制程序启用mtrace(MALLOC_TRACE) [英] Enable mtrace (MALLOC_TRACE) for binary program

问题描述

如何启用 mtrace() (和MALLOC_TRACE env)用于没有源代码的二进制程序?

How can I enable mtrace() (and MALLOC_TRACE env) for a binary program without sources?

mtrace是glibc的功能: http://www .gnu.org/s/hello/manual/libc/Allocation-Debugging.html

mtrace is feature of glibc: http://www.gnu.org/s/hello/manual/libc/Allocation-Debugging.html

谢谢

推荐答案

mtrace.c

#include <mcheck.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>


void __mtracer_on () __attribute__((constructor));
void __mtracer_off () __attribute__((destructor));
void __mtracer_on ()
{
    char *p=getenv("MALLOC_TRACE");
    char tracebuf[1023];
    if(!p)
        p="malloc_trace";
    sprintf(tracebuf, "%s.%d", p, getpid());
    setenv("MALLOC_TRACE",tracebuf, 1);
    atexit(&__mtracer_off);
    mtrace();
}

void __mtracer_off ()
{
    muntrace();
}

使用gcc mtrace.c -fPIC -shared -o libmmtrace.so

运行

MALLOC_TRACE=echo LD_PRELOAD=./libmmtrace.so /bin/echo 42

或

LD_PRELOAD=./libmmtrace.so /bin/echo 42

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