LOL,Too early to end the problem. My goal is to "attached every file and dir in android with a security label". The files under /data can be setxattr and the change can last after the reboot of the emulator now, but the change of setxattr to the files under /system still can't last after the reboot of the emulator. That's really weird. According to init.rc, both the /data and /system were mounted in yaffs type. I can't figure out any difference between them to cause this. ps: I modified init.rc to make /system mounted rw.
2013/1/15 董钰 <dywisdom...@gmail.com> > Thanks Stephen Smalley! > The problem was solved. I got the new yaffs2 version by "git clone git:// > www.aleph1.co.uk/yaffs2" which you mentioned before, and using the ".sh" > file in it to replace the original yaffs2. > Now the change to the xattr of the file will last even after the reboot of > the emulator. > Dywisdomno1 > > > 2013/1/15 董钰 <dywisdom...@gmail.com> > >> >What kernel are you using? >> I 've used "git clone >> https://android.googlesource.com/kernel/goldfish.git"; to get my kernel >> souce code. and using "android-goldfish-2.6.29" branch. Found no xattr >> support for yaffs2, then used the patch from >> www.enck.org/tools/yaffs_xattr.patch >> to patch the kernel, and found the above problem. >> >> >Also, how are you invoking the emulator? >> I set ANDROID_PRODUCT_OUT to my out dir which have .img files. And >> use"emulator >> -show-kernel -kernel kernel/goldfish/arch/arm/boot/zImage" to invoke the >> emulator >> >> >And which partition are you trying to modify? /data or /system? >> I try to change the xattr of the file in /data/local. >> >> I'm wondering if i can get the detailed process to patch the kernel >> source. >> Thank you again for your help! >> >> Dywisdomno1 >> >> >> >> 2013/1/14 Stephen Smalley <s...@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? >>> >> >> >
