seccomp: mount more up-to-date seccomp features

(cherry picked from commit 31861fd40d)

live-build/auto/build

@@ -123,6 +123,7 @@ preinstall_snaps() {
 	mount --bind /proc chroot/proc
 	# Provide more up to date apparmor features, matching target kernel
 	mount -o bind /usr/share/livecd-rootfs/live-build/apparmor/generic chroot/sys/kernel/security/apparmor/features
+	mount -o bind /usr/share/livecd-rootfs/live-build/seccomp/generic.actions_avail chroot/proc/sys/kernel/seccomp/actions_avail
 
 	snap_validate_seed chroot
 

live-build/functions

@@ -107,6 +107,7 @@ setup_mountpoint() {
     mount securityfs -t securityfs "$mountpoint/sys/kernel/security"
     # Provide more up to date apparmor features, matching target kernel
     mount -o bind /usr/share/livecd-rootfs/live-build/apparmor/generic "$mountpoint/sys/kernel/security/apparmor/features/"
+    mount -o bind /usr/share/livecd-rootfs/live-build/seccomp/generic.actions_avail "$mountpoint/proc/sys/kernel/seccomp/actions_avail"
     mount -t tmpfs none "$mountpoint/tmp"
     mount -t tmpfs none "$mountpoint/var/lib/apt"
     mount -t tmpfs none "$mountpoint/var/cache/apt"