}void free(void *p) {if(free_flag) {free_flag = 0;printf("free\n");free_f(p);free_flag = 1;} else {free_f(p);}}#endifint main(int argc, char **argv){#if TEST_MEM_LEAK // 这里if到endif之间的部分可分装成函数调用malloc_f = dlsym(RTLD_NEXT, "malloc");if(!malloc...
printf("load malloc failed: %s\n", dlerror()); return 1; } free_f = dlsym(RTLD_NEXT, "free"); if(!free_f) { printf("load free failed: %s\n", dlerror()); return 1; } #endif void *p1 = malloc(10); //这里会先调用本文中的malloc函数 void *p2 = malloc(20); //这里的p2...
Due to unexpected linking behavior,dlsym()when usingRTLD_NEXTcan return pointers tomalloc/freeimplementations insideld-linux(dynamic linker/loader). Usingld-linux‘smalloc/freefor general heap allocations leads to memory leaks because that particular version offree()doesn’t actually release memory. Yo...
Due to unexpected linking behavior,dlsym()when usingRTLD_NEXTcan return pointers tomalloc/freeimplementations insideld-linux(dynamic linker/loader). Usingld-linux‘smalloc/freefor general heap allocations leads to memory leaks because that particular version offree()doesn’t actually release memory. Yo...
#include <dlfcn.h> void *dlsym(void *handle, const char *symbol); handle The RTLD_DEFAULT and RTLD_NEXT pseudo-handles are not supported. Programming considerations Only the called program is searched for adlsymfunction call. If the symbol that is being looked for is a function, the callabl...
在镜像上执行该SQL，并在执行后还原镜像。这样经过层层把关就可以大大减小出现误操作的几率。
void * curr_sym = dlsym(RTLD_NEXT, "accept"); printf("Real: ...
其中handle可以是dlopen函数返回的handle值,也可以是RTLD_DEFAULT或RTLD_NEXT RTLD_DEFAULT表示按默认的顺序搜索共享库中符号symbol第一次出现的地址 RTLD_NEXT表示在当前库以后按默认的顺序搜索共享库中符号symbol第一次出现的地址 具体区别可以通过下面的代码dlsym1.c来区别: ...
void (*origFree)(void*) = dlsym(RTLD_NEXT,"free"); origFree(p); } void* memAlloc(size_t s) { return malloc(s); // Call the malloc() wrapper. } void memDel(void* p) { free(p); // Call the free() wrapper. } Main.c ...
free_f = dlsym(RTLD_NEXT, "free"); if(!free_f) { printf("load free failed: %s ", dlerror()); return 1; } #endif void *p1 = malloc(10); //这里会先调用本文中的malloc函数 void *p2 = malloc(20); //这里的p2未释放存在内存泄漏,通过利用查看打印的malloc与free次数是否一样来判断 ...