linux-kernel - Re: [PATCH] builddeb: fix file permissions before packaging

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Date:	Fri, 22 Jul 2016 14:15:32 +0200
From:	Michal Marek <mmarek@...e.com>
To:	Henning Schild <henning.schild@...mens.com>
Cc:	linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org
Subject: Re: [PATCH] builddeb: fix file permissions before packaging

On 2016-07-07 16:50, Henning Schild wrote:
> Builddep is not very explicit about file permissions. Actually the file
> permissions in the package are largely influenced by the umask of the
> user cloning the git and building the package. If that umask does not
> set go+r the resulting linux-headers package will prevent non-root users
> from building out-of-tree modules. And that is probably just one
> unexpected effect.
> Being a packaging/install tool builddep should make sure the file
> permissions are set correctly and not just derived from a value that is
> never checked.
> 
> This patch derives the "r" and "x" bits for all files from the file
> owner, all directories in the package will be 755.
> 
> Signed-off-by: Henning Schild <henning.schild@...mens.com>
> ---
>  scripts/package/builddeb | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/scripts/package/builddeb b/scripts/package/builddeb
> index 86e56fe..615e0ed 100755
> --- a/scripts/package/builddeb
> +++ b/scripts/package/builddeb
> @@ -26,6 +26,11 @@ create_package() {
>  	# Fix ownership and permissions
>  	chown -R root:root "$pdir"
>  	chmod -R go-w "$pdir"
> +	# in case we are in a restrictive umask environment like 0077
> +	# set permissions for dirs and derive "go"-"rx" permissions from "u"
> +	find $pdir -type d -exec chmod 0755 {} +
> +	find $pdir -type f -perm -u+r -exec chmod go+r {} +
> +	find $pdir -type f -perm -u+x -exec chmod go+x {} +

This can be simplified as

chmod -R a+rX "$pdir"

Michal