Merge pull request #6013 from AkihiroSuda/cherrypick-5982-1.5

fuweid · web-flow · commit 00e5fbe2a2c2 · 2021-09-17T00:00:11.000+08:00
diff --git a/contrib/seccomp/seccomp_default.go b/contrib/seccomp/seccomp_default.go
@@ -49,6 +49,7 @@ func arches() []specs.Arch {
 
 // DefaultProfile defines the allowed syscalls for the default seccomp profile.
 func DefaultProfile(sp *specs.Spec) *specs.LinuxSeccomp {
+	nosys := uint(unix.ENOSYS)
 	syscalls := []specs.LinuxSyscall{
 		{
 			Names: []string{
@@ -526,6 +527,7 @@ func DefaultProfile(sp *specs.Spec) *specs.LinuxSeccomp {
 				Names: []string{
 					"bpf",
 					"clone",
+					"clone3",
 					"fanotify_init",
 					"fsconfig",
 					"fsmount",
@@ -657,6 +659,15 @@ func DefaultProfile(sp *specs.Spec) *specs.LinuxSeccomp {
 				},
 			})
 		}
+		// clone3 is explicitly requested to give ENOSYS instead of the default EPERM, when CAP_SYS_ADMIN is unset
+		// https://github.com/moby/moby/pull/42681
+		s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
+			Names: []string{
+				"clone3",
+			},
+			Action:   specs.ActErrno,
+			ErrnoRet: &nosys,
+		})
 	}
 
 	return s
