diff --git a/libcontainer/setns_init_linux.go b/libcontainer/setns_init_linux.go index 09ab552b3..e891773ec 100644 --- a/libcontainer/setns_init_linux.go +++ b/libcontainer/setns_init_linux.go @@ -4,6 +4,7 @@ import ( "errors" "fmt" "os" + "os/exec" "strconv" "github.com/opencontainers/selinux/go-selinux" @@ -82,6 +83,21 @@ func (l *linuxSetnsInit) Init() error { if err := apparmor.ApplyProfile(l.config.AppArmorProfile); err != nil { return err } + + // Check for the arg before waiting to make sure it exists and it is + // returned as a create time error. + name, err := exec.LookPath(l.config.Args[0]) + if err != nil { + return err + } + // exec.LookPath in Go < 1.20 might return no error for an executable + // residing on a file system mounted with noexec flag, so perform this + // extra check now while we can still return a proper error. + // TODO: remove this once go < 1.20 is not supported. + if err := eaccess(name); err != nil { + return &os.PathError{Op: "eaccess", Path: name, Err: err} + } + // Set seccomp as close to execve as possible, so as few syscalls take // place afterward (reducing the amount of syscalls that users need to // enable in their seccomp profiles). @@ -101,5 +117,5 @@ func (l *linuxSetnsInit) Init() error { return &os.PathError{Op: "close log pipe", Path: "fd " + strconv.Itoa(l.logFd), Err: err} } - return system.Execv(l.config.Args[0], l.config.Args[0:], os.Environ()) + return system.Exec(name, l.config.Args[0:], os.Environ()) }