seccomp: ppc64le: allow swapcontext

swapcontext seems to be used for coroutines in some languages (at least
ruby), enough to have been added to other major engines by an actual user.

Link: https://github.com/moby/moby/pull/43092
Link: https://github.com/systemd/systemd/pull/9487
Link: https://github.com/containerd/containerd/pull/6411
Signed-off-by: Dominique Martinet <dominique.martinet@atmark-techno.com>

common/pkg/seccomp/default_linux.go

@@ -75,7 +75,6 @@ func DefaultProfile() *Seccomp {
 				"pciconfig_write",
 				"sgetmask",
 				"ssetmask",
-				"swapcontext",
 				"swapoff",
 				"swapon",
 				"sysfs",
@@ -526,6 +525,7 @@ func DefaultProfile() *Seccomp {
 		{
 			Names: []string{
 				"sync_file_range2",
+				"swapcontext",
 			},
 			Action: ActAllow,
 			Args:   []*Arg{},

common/pkg/seccomp/seccomp.json

@@ -79,7 +79,6 @@
 				"pciconfig_write",
 				"sgetmask",
 				"ssetmask",
-				"swapcontext",
 				"swapoff",
 				"swapon",
 				"sysfs",
@@ -565,7 +564,8 @@
 		},
 		{
 			"names": [
-				"sync_file_range2"
+				"sync_file_range2",
+				"swapcontext"
 			],
 			"action": "SCMP_ACT_ALLOW",
 			"args": [],