Re: Security label of file in Yaffs2 on Android

[Stephen Smalley <sds@tycho.nsa.gov>]

On 01/13/2013 11:15 PM, 董钰 wrote:
> Hello
> I want to set security label(use xattr security.mylabel) of the file in 
> Yaffs2 on Android.
> I've been able to use setxattr syscall to set security label, and use 
> getxattr syscall to verify the change right after that.
> The problem is that the change is gone when i reboot the emulator.I used 
> to try the same process on linux and ext2 filesystem，and the change 
> will last like forever.
> 
> Is is about the emulator? Or it is all about the support level of xattr 
> in Yaffs2？
> 
> Thank you for any help.

What kernel are you using?  We had to patch the emulator kernel for SE
Android, back-porting a more recent snapshot of the yaffs2 code that
provides native support for xattrs and applying a further change to
ensure that new inodes are assigned a SELinux attribute on creation.

Also, how are you invoking the emulator?

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