[Buildroot] Fighting with suid bit

[kaneda at chez.com]

Shame on me !
You make me check my buildroot version and, unfortunatly, I was using an 
old buildroot git commit.

I so switched to 2018.02.x branch.
Some hours later (distclean power), I can confirm suid bit is no longer 
lost on cpio archive.

Thanks for your help


Le 2018-05-04 15:49, Peter Korsgaard a écrit :
>>>>>> "kaneda" == kaneda  <kaneda at chez.com> writes:
> 
>  > Hi,
>  > It seems you got something here....
> 
> 
>  > /target
>  > - ucon64 is 4755
>  > - udevadm is 4755
> 
> 
>  > rootfs.tar.gz
>  > - ucon64 is 4755
>  > - udevadm is 4755
> 
> 
>  > rootfs.cpio
>  > - ucon64 is 0755
>  > - udevadm is 0755
> 
> 
>  > As you can see, it's not only my own file, but also udevadm
> 
> What buildroot version are you on? I just did a quick test on 2018.02.x
> with the following config:
> 
> # BR2_PACKAGE_BUSYBOX is not set
> BR2_PACKAGE_IPUTILS=y
> BR2_TARGET_ROOTFS_CPIO=y
> 
> (the iputils package has a few setuid binaries):
> 
> tar -tvf rootfs.tar | grep ping
> -rwsr-xr-x 0/0           43264 2018-05-04 15:35 ./bin/ping
> -rwxr-xr-x 0/0           12108 2018-05-04 15:35 ./sbin/arping
> 
> cpio -ivt < rootfs.cpio | grep ping
> -rwxr-xr-x   1 root     root        12108 May  4 15:35 sbin/arping
> -rwsr-xr-x   1 root     root        43264 May  4 15:35 bin/ping
> 
> So that looks sensible.
> 
> I also tried it on current master with the same results:
> 
> tar -tvf rootfs.tar | grep ping
> -rwsr-xr-x 0/0           43264 2018-05-04 15:44 ./bin/ping
> -rwxr-xr-x 0/0           12108 2018-05-04 15:44 ./sbin/arping
> 
> cpio -ivt < rootfs.cpio | grep ping
> -rwxr-xr-x   1 root     root        12108 May  4 15:44 sbin/arping
> -rwsr-xr-x   1 root     root        43264 May  4 15:44 bin/ping
> 
> --
> Bye, Peter Korsgaard
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