我如何调试 exec* = -1 ENOENT？答案

【问题标题】：How do i a debug exec* = -1 ENOENT?我如何调试 exec* = -1 ENOENT？
【发布时间】：2018-02-26 13:10:29
【问题描述】：

我正在从程序集构建这个二进制文件，并尝试将它（可能很糟糕）与 libc 链接。但是我的程序无法启动，execve 可能无法找到某些东西。如何调试？

$ file ctime
ctime: ELF 32-bit LSB executable, ARM, EABI5 version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux.so.2, for GNU/Linux 3.2.0, not stripped

$ strace -f ./ctime
execve("./ctime", ["./ctime"], [/* 19 vars */]) = -1 ENOENT (No such file or directory)
fstat64(2, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
write(2, "strace: exec: No such file or di"..., 40strace: exec: No such file or directory
) = 40
getpid()                                = 13784
exit_group(1)                           = ?
+++ exited with 1 +++

$ gdb ./ctime
GNU gdb (Raspbian 7.12-6) 7.12.0.20161007-git
Reading symbols from ./ctime...done.
(gdb) r
Starting program: ./ctime
/bin/bash: ./ctime: No such file or directory
During startup program exited with code 127.

【问题讨论】：

标签： linux gdb exec strace

【解决方案1】：

如何调试它？

在man execve 中查看 ENOENT 错误的 ERRORS 部分：

ENOENT The file filename or a script or ELF interpreter does not
      exist, or a shared library needed for the file or interpreter
      cannot be found.

此错误最可能的原因之一是：“ELF 解释器不存在”。使用此命令查看二进制文件中 ELF 解释器的当前路径：

readelf -l ctime | grep "Requesting program interpreter"

很可能是您的程序在启动时找不到。

【讨论】：