[Buildroot] [git commit] package/openssh: Set /var/empty permissions

[Arnout Vandecappelle (Essensium/Mind)]

commit: https://git.buildroot.net/buildroot/commit/?id=f85665c58562a967e3dcb5f72fa8af0a606c9274
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/master

The openssh privilege separation feature, enabled by default,
requires that the path /var/empty exists and has certain permissions
(not writable by the sshd user). Note that nothing ever gets writting
in this directory, so it works fine on a readonly rootfs.

See README.privsep included as part of the openssh distribution.

Signed-off-by: Chris Lesiak <chris.lesiak at licor.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout at mind.be>
---
 package/openssh/openssh.mk | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/package/openssh/openssh.mk b/package/openssh/openssh.mk
index 4ee7727fb9..4781cd3fbc 100644
--- a/package/openssh/openssh.mk
+++ b/package/openssh/openssh.mk
@@ -23,6 +23,10 @@ define OPENSSH_USERS
 	sshd -1 sshd -1 * - - - SSH drop priv user
 endef
 
+define OPENSSH_PERMISSIONS
+	/var/empty d 755 root root - - - - -
+endef
+
 ifeq ($(BR2_TOOLCHAIN_SUPPORTS_PIE),)
 OPENSSH_CONF_OPTS += --without-pie
 endif