尝试在kext文件上运行kextutil返回权限错误

Question

Hi-Stackoverflow社区。

尝试运行以下教程，这样我就可以学习如何编写驱动程序util
http://www.robertopasini.com/index.php/2-uncategorised/625-osx-creating-a-device-driver

我正试图在我的构建生成的kext文件上运行kextutil。根据说明，我将其复制到我的临时文件夹中。但我得到了以下错误：

admins-Mac-mini:Debug admin$ kextutil -n -t /tmp/ssvac.kext
Skipping staging and system policy checks because not running as root, expect staging errors.
Kext rejected due to improper filesystem permissions: <OSKext 0x7f91d402f140 [0x7fff898b2cc0]> { URL = "file:///private/tmp/ssvac.kext/", ID = "myappleid.ssvac" }
Code Signing Failure: code signature is invalid
Authentication Failures: 
File owner/permissions are incorrect (must be root:wheel, nonwritable by group/other): 
/private/tmp/ssvac.kext
Contents
_CodeSignature
CodeResources
MacOS
ssvac
Info.plist
Diagnostics for /private/tmp/ssvac.kext:
Authentication Failures: 
File owner/permissions are incorrect (must be root:wheel, nonwritable by group/other): 
/private/tmp/ssvac.kext
Contents
_CodeSignature
CodeResources
MacOS
ssvac
Info.plist
admins-Mac-mini:Debug admin$ 

我试图更改权限/所有者，如下所示：

admins-Mac-mini:Debug admin$ chown root:wheel /tmp/ssvac.kext/
admins-Mac-mini:Debug admin$ ls -lah /tmp/ssvac.kext/
total 0
drwxrwxrwx  3 root   wheel    96B 16 Oct 16:37 .
drwxrwxrwt  7 root   wheel   224B 19 Oct 08:08 ..
drwxr-xr-x  5 admin  wheel   160B 16 Oct 16:37 Contents
admins-Mac-mini:Debug admin$ kextutil -n -t /tmp/ssvac.kext

不知道该如何解决。如果你有什么建议，我将不胜感激。

谢谢！

编辑1

My mistake was when I copied from the debug folder to /tmp/, I didn't use the -r switch.  Now that I have, this is the error I'm getting: 
admins-Mac-mini:Debug admin$ cp -r ssvac.kext/ /tmp/
admins-Mac-mini:Debug admin$ sudo kextutil /tmp/
Contents/                     com.apple.launchd.GufwRL5Sf0/ com.google.Keystone/          powerlog/                     ssvac.kext/
admins-Mac-mini:Debug admin$ sudo kextutil /tmp/ssvac.kext/
Password:
Untrusted kexts are not allowed
Kext with invalid signature (-67050) denied: /private/var/db/KernelExtensionManagement/Staging/tmp.RLlmC1/59AFE9EA-12E3-42C0-B3FC-E98EF987D9B2.kext
Bundle (/private/tmp/ssvac.kext) failed to validate, deleting: /private/var/db/KernelExtensionManagement/Staging/tmp.RLlmC1/59AFE9EA-12E3-42C0-B3FC-E98EF987D9B2.kext
Unable to stage kext (/private/tmp/ssvac.kext) to secure location.
admins-Mac-mini:Debug admin$ 

Answer 1

从ls输出中可以看到，kexts实际上是至少包含Info.plist文件的目录，以及预定义目录布局中的代码签名信息。(从Contents子目录开始(通常它还包含一个二进制可执行文件kext中的所有文件和子目录必须具有适当的权限，才能考虑加载kext。这意味着在使用chown时，必须使用-R标志递归地应用权限。

与其使用chown，我通常建议您简单地将kext复制到一个临时位置作为根用户，这样在代码/编译/加载/调试周期中，您就不会遇到以无特权用户身份尝试用更新版本替换它的问题：

# Copies kext to /tmp, owned by root
sudo cp -r "path/to/built.kext" "/tmp/"
# Attempts to load kext
sudo kextutil "/tmp/built.kext"

(强制性免责声明指出，许多类型的kext现在已被弃用，您需要确保编写一个kext真的，真的，真的是您项目的正确前进方向。(