On Thu, May 28, 2015 at 1:06 PM, Alexander Larsson <alexl@xxxxxxxxxx> wrote: > On Thu, 2015-05-28 at 12:14 -0500, Eric W. Biederman wrote: >> >> > Where does the second namespace enter into this? >> >> Step a. Create create a user namespace where uid 0 is mapped to your >> real uid, and set up your sandbox (aka mount /dev/pts and everything >> else). >> >> Step b. Create a nested user namespace where your uid is identity >> mapped and run your desktop application. You can even drop all caps >> in >> your namespace. > > Just tried this. Its not the nicest, and it doubles the number of > namespaces in action for each sandbox, but it does work. How much overhead is involved in each user namespace? Is there any system-wide limit on total namespaces, other than RAM? Is there (non-negligible) CPU overhead for each syscall seeking permissions in the namespace? -Kenton -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
