[Buildroot] [PATCH/next] system/skeleton: use uid/gid 65534 for nobody/nogroup

[Arnout Vandecappelle <arnout@mind.be>]

On 25-08-16 23:47, Peter Korsgaard wrote:
> As recently discussed on lwn.net: https://lwn.net/Articles/695478/
>
> The kernel has special behaviour for uid/gid 65534:
>
> 1. The kernel maps UIDs > 65535 to it when some subsystem/API/fs
>    only supports 16bit UIDs, but a 32bit UID is passed to it.
>
> 2. it's used by the kernel's user namespacing as the internal UID
>    that external UIDs are mapped to that don't have any local mapping.
>
> 3. It's used by NFS for all user IDs that cannot be mapped locally if
>    UID mapping is enabled.
>
> Most distributions already map (or are in the progress of changing)
> nobody/nogroup to the 65534 uid/gid, so lets do so as well.
>
> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
 (not runtime tested though)

 Regards,
 Arnout

> ---
>  system/skeleton/etc/group  | 2 +-
>  system/skeleton/etc/passwd | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/system/skeleton/etc/group b/system/skeleton/etc/group
> index c813da2..76346b3 100644
> --- a/system/skeleton/etc/group
> +++ b/system/skeleton/etc/group
> @@ -22,5 +22,5 @@ plugdev:x:46:
>  staff:x:50:
>  lock:x:54:
>  netdev:x:82:
> -nogroup:x:99:
>  users:x:100:
> +nogroup:x:65534:
> diff --git a/system/skeleton/etc/passwd b/system/skeleton/etc/passwd
> index 883265a..d8281d2 100644
> --- a/system/skeleton/etc/passwd
> +++ b/system/skeleton/etc/passwd
> @@ -6,4 +6,4 @@ sync:x:4:100:sync:/bin:/bin/sync
>  mail:x:8:8:mail:/var/spool/mail:/bin/false
>  www-data:x:33:33:www-data:/var/www:/bin/false
>  operator:x:37:37:Operator:/var:/bin/false
> -nobody:x:99:99:nobody:/home:/bin/false
> +nobody:x:65534:65534:nobody:/home:/bin/false



-- 
Arnout Vandecappelle                          arnout at mind be
Senior Embedded Software Architect            +32-16-286500
Essensium/Mind                                http://www.mind.be
G.Geenslaan 9, 3001 Leuven, Belgium           BE 872 984 063 RPR Leuven
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