Please note that by default, the program is not allowed to start multiple processes of threads. If you need that, turn on the control group mode (see below).

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Unless --no-default-dirs is specified, the default set of directory rules binds /bin, /dev (with devices allowed), /lib, /lib64 (if it exists), and /usr. It also binds the working directory to /box (read-write), mounts the proc filesystem at /proc, and creates a temporary directory /tmp.

It is recommended to have sys.fs.protected_hardlinks sysctl set to 1 (which is probably default on modern Linux systems). Otherwise, the user running the sandbox could trick isolate to changing the owner of unrelated files.

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Isolate expects that the root directory "/" is a mount point. When running isolate inside a chroot, this may not be the case, and isolate may fail with "Cannot privatize mounts". A workaround for this is to convert the root directory of the chroot into a mount point using a bind mount, prior to entering the chroot and running isolate. For example:

Isolation 中文

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UNIX processes normally inherit all environment variables from their parent. The sandbox however passes only those variables which are explicitly requested by environment rules:

isolated意思

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Isolate is designed to run setuid to root. The sub-process inside the sandbox then switches to a non-privileged user ID (different for each --box-id). The range of UIDs available and several filesystem paths are set in a configuration file, by default located in /usr/local/etc/isolate.

Issues

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Isolate can make use of system control groups provided by the kernel to constrain programs consisting of multiple processes. Please note that this feature needs special system setup described in the INSTALLATION section.

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Flutter Isolate

The reproducibility of results can be improved by tuning some kernel parameters, listed below. Some of these parameters can be checked using the program isolate-check-environment.

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Run program within a sandbox, so that it cannot communicate with the outside world and its resource consumption is limited. This can be used for example in a programming contest to run untrusted programs submitted by contestants in a controlled environment.

Isolate was written by Martin Mares and Bernard Blackham. It can be distributed and used under the terms of the GNU General Public License version 2 or any later version.

isolate中文

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When the program inside the sandbox finishes correctly, the sandbox returns 0. If it finishes incorrectly, it returns 1. All other return codes signal an internal error.

Please note that not all keys have to be present. For example, no status nor message is reported upon normal termination.

The rules are executed in the order in which they are given. Default rules come before all user rules. When a rule is replaced, it retains the original position in the order. This matters when one rule’s in is a sub-directory of another rule’s in. For example if you first bind to a and then to a/b, it will work as expected, but a sub-directory b must have existed in the directory bound to a (isolate never creates subdirectories in bound directories for security reasons). If the order is a/b before a, then the directory bound to a/b becomes invisible by the later binding on a.

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The meta-file contains miscellaneous meta-information on execution of the program within the sandbox. It is a textual file consisting of lines of format key:value. The following keys are defined:

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Isolate depends on several advanced features of the Linux kernel, like different kinds of namespaces and control groups. These features are available in kernels of most Linux distributions now, but if you are building your own kernel, you have to be careful.

By default, all directories are bound read-only and restricted (no devices, no setuid binaries). This behavior can be modified using the options:

If you have systemd-coredump installed, please keep in mind that it records core files even for processes inside the sandbox. As it configures the kernel to deliver core dumps using a pipe, it is not affected by the --core limit.