对于 GCC 而言，默认情况下，所编译的程序中对标准 C 函数的链接，都是通过动态链接方式来链接 libc.so.6 这个函数库的。 LD_PRELOAD 是 Linux 系统的一个环境变量，它可以影响程序运行时的链接（Runtime linker）顺序，它允许程序运行时优先加载指定的动态链接 ...

All of these tasks are possible if you use the LD_PRELOAD environment variable and a small shim program placed between the application and the library. As an example, say you create a shared library ...

One way that this library-loading mechanism is exploited is through the use of an environment variable called LD_PRELOAD. As Jaime Blasco explains in his research, “LD_PRELOAD is the easiest and ...