Linux 使用 VLC 多媒体的 正确姿势，解决 VLC is not supposed to be run as root. 的问题

  How to run vlc video player as root user in Linux

  首先是安装，不过在Debian系Linux中，使用 apt / apt-get 包管理会很轻松：

	$ sudo apt install vlc -y

   出现 vlc 多媒体图标 。

   若读者是Red Hat系Linux，则可参考博主另一篇：yum 安装 VLC多媒体

   可能细心的小伙伴们，在安装后就已经发现了，无论什么系Linux，但当我们在root账户下直接运行VLC时，就会出下如下报错：

	VLC is not supposed to be run as root. Sorry.
	If you need to use real-time priorities and/or privileged TCP ports
	you can use vlc-wrapper (make sure it is Set-UID root and
	cannot be run by non-trusted users first).

  别着急，博主这就为你解答，执行如下命令：

  ①：

	cp /usr/bin/vlc /usr/bin/vlc-backup

  ②：

	needle=$(objdump -d /usr/bin/vlc | grep euid | tail -1 | awk '{print "\x"$2"\x"$3"\x"$4"\x"$5"\x"$6;}')

  ③：

	sed -ir "s/$needle/xb8x01x00x00x00/" /usr/bin/vlc

  此时，会发现在 root 权限下可正常运行 vlc多媒体了。



  或许，会有小伙伴发问，是如何解决该问题的？博主，也为感兴趣的读者转载了国外大佬解决该问题的全过程：

  How I found this out   When starting vlc as root you will probably get the following error message:

	VLC is not supposed to be run as root. Sorry.
	If you need to use real-time priorities and/or privileged TCP ports
	you can use vlc-wrapper (make sure it is Set-UID root and
	cannot be run by non-trusted users first).

  Here is how I change this behavior:

	gdb /usr/bin/vlc
	(gdb) info functions
	All defined functions:

	Non-debugging symbols:
	[...]
	0x0000000000400f40  geteuid
	[...]

  Let’s break in the function to get the effective user identity:

	(gdb) break geteuid
	Breakpoint 1 at 0x400f40

  Let’s start the program to run till the first breakpoint:

	(gdb) run
	Starting program: /usr/bin/vlc 

	Breakpoint 1, 0x00007ffff71cfc70 in geteuid () from /lib64/libc.so.6

  OK, let’s trace the program one command at a time:

	(gdb) stepi
	0x00007ffff71cfc75 in geteuid () from /lib64/libc.so.6
	(gdb) stepi
	0x00007ffff71cfc77 in geteuid () from /lib64/libc.so.6
	(gdb) 
	0x0000000000401103 in ?? ()
	(gdb) 
	0x0000000000401105 in ?? ()
	(gdb) 

  Ok, let’s look at this program part with a disassembler:

	objdump -d -M intel /usr/bin/vlc
	[...]
	 4010f9:       e8 32 0a 00 00          call   401b30 
	 4010fe:       e8 3d fe ff ff          call   400f40 
	 401103:       85 c0                   test   eax,eax
	 401105:       0f 84 04 06 00 00       je     40170f 
	 40110b:       be ca 1f 40 00          mov    esi,0x401fca
	 401110:       bf 06 00 00 00          mov    edi,0x6
	[...]

  If you do not have exactly the same vlc version as I have, yours will probably look different. In this case just follow the instructions below and assume your values instead of this example.   It seems as if (address) 4010fe calls geteuid, 401103 prepares a conditional jump and 401105 jumps if equal somewhere. So we call a hexeditor:

	okteta /usr/bin/vlc

  and replace

	0f 84 04 06 00 00

  by some instructions to wait:

	90 90 90 90 90 90

  When calling vlc now as root, it does not abort 
  在阅读完之后，会发现大佬解决问题的方式，有着我们很多可学习借鉴的地方，是真的很强！！膜拜！