Jan Bramkamp
276d9b88a9
The jail(8) command must not leave parsed configuration files open since the file descriptors will be leaked to child processes including the untrusted exec.start or exec.stop hooks. While fopen() doesn't provide direct access to O_CLOEXEC, it does provide access to FD_CLOEXEC via "e" in the mode string which provides the desired defense in depth against leaking file descriptors into exec.* hooks since those always execve() into a shell. Jail configuration is potentially sensitive and some hooks execute from within the jail context, leaving some opening for the jail to exfiltrate information about the host environment. (Commit message wordsmithed by kevans) PR: 295052 Reviewed by: kevans MFC after: 3 days
FreeBSD Source:
This is the top level of the FreeBSD source directory.
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Source Roadmap:
| Directory | Description |
|---|---|
| bin | System/user commands. |
| cddl | Source code for third-party software under the Common Development and Distribution License. |
| contrib | Source code for third-party software. |
| crypto | Source code for cryptographic libraries and commands (see crypto/README). |
| etc | Template files for /etc. |
| gnu | Source code for third-party software under the GNU General Public License (GPL) or Lesser General Public License (LGPL). Please see gnu/COPYING and gnu/COPYING.LIB for more information. |
| include | System include files. |
| kerberos5 | Build system for Kerberos 5 (Heimdal). |
| krb5 | Build system for Kerberos 5 (MIT). |
| lib | System libraries. |
| libexec | System commands intended to be executed by other commands or daemons. |
| packages | Base system packages. |
| release | Makefiles and scripts used for building releases and VM images. |
| rescue | Build system for statically linked /rescue commands. |
| sbin | System commands. |
| secure | Build system for cryptographic libraries and commands (excluding Kerberos). |
| share | Shared resources. |
| stand | Boot loader sources. |
| sys | Kernel sources (see sys/README.md). |
| targets | Support for experimental DIRDEPS_BUILD |
| tests | Tests which can be run by Kyua. See tests/README for additional information. |
| tools | Ancillary utilities and tests (not included in the build). |
| usr.bin | User commands. |
| usr.sbin | System administration commands. |
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