> Drawback: complexity. If we decide to limit ourselves to the original
> threat model (rogue guest), and enter the sandbox only after setup, we
> can keep things simpler.
We could do both without much complexity. This looks simple enough to me:
rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(chroot), 1,
SCMP_A0(SCMP_CMP_EQ, chroot_dir));
if (rc < 0)
goto seccomp_return;
rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(chdir), 1,
SCMP_A0(SCMP_CMP_EQ, "/"));
if (rc < 0)
goto seccomp_return;
The only time chroot_dir is ever used is in os-posix.c:139:
if (chroot(chroot_dir) < 0) {
