[openwrt/openwrt] base-files: address sed in-place without SELinux awareness

[LEDE Commits]

dangole pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/5109bd164c8f2273329483f990188fb36cf3ad68

commit 5109bd164c8f2273329483f990188fb36cf3ad68
Author: Dominick Grift <dominick.grift at defensec.nl>
AuthorDate: Sun May 1 19:54:04 2022 +0200

    base-files: address sed in-place without SELinux awareness
    
    sed(1) in busybox does not support this functionality:
    https://git.savannah.gnu.org/cgit/sed.git/tree/sed/execute.c#n598
    
    This causes /etc/group to become mislabeled when a package requests
    that a uid/gid be added on OpenWrt with SELinux
    
    Signed-off-by: Daniel Golle <daniel at makrotopia.org>
    [move restorecon inside lock]
    Signed-off-by: Dominick Grift <dominick.grift at defensec.nl>
---
 package/base-files/files/lib/functions.sh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/package/base-files/files/lib/functions.sh b/package/base-files/files/lib/functions.sh
index ee0c33845c..9db0871d6c 100644
--- a/package/base-files/files/lib/functions.sh
+++ b/package/base-files/files/lib/functions.sh
@@ -386,6 +386,7 @@ group_add_user() {
 	echo "$grp" | grep -q ":$" && delim=""
 	[ -n "$IPKG_INSTROOT" ] || lock /var/lock/passwd
 	sed -i "s/$grp/$grp$delim$2/g" ${IPKG_INSTROOT}/etc/group
+	selinuxenabled 2>/dev/null && restorecon /etc/group
 	[ -n "$IPKG_INSTROOT" ] || lock -u /var/lock/passwd
 }