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If possible, apply seccomp rules immediately before exec #789

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merged 1 commit into from
Apr 28, 2016
Merged

If possible, apply seccomp rules immediately before exec #789

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10 changes: 9 additions & 1 deletion libcontainer/standard_init_linux.go
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Original file line number Diff line number Diff line change
Expand Up @@ -123,7 +123,10 @@ func (l *linuxStandardInit) Init() error {
if err := syncParentReady(l.pipe); err != nil {
return err
}
if l.config.Config.Seccomp != nil {
// Without NoNewPrivileges seccomp is a privileged operation, so we need to
// do this before dropping capabilities; otherwise do it as late as possible
// just before execve so as few syscalls take place after it as possible.
if l.config.Config.Seccomp != nil && !l.config.NoNewPrivileges {
if err := seccomp.InitSeccomp(l.config.Config.Seccomp); err != nil {
return err
}
Expand All @@ -142,6 +145,11 @@ func (l *linuxStandardInit) Init() error {
if syscall.Getppid() != l.parentPid {
return syscall.Kill(syscall.Getpid(), syscall.SIGKILL)
}
if l.config.Config.Seccomp != nil && l.config.NoNewPrivileges {
if err := seccomp.InitSeccomp(l.config.Config.Seccomp); err != nil {
return err
}
}

return system.Execv(l.config.Args[0], l.config.Args[0:], os.Environ())
}