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Add support for 'exec', 'suid', 'dev' mount flags
Previously, we explicitly set noexec/nosuid/nodev on every mount, with no ability to disable them. The 'mount' command on Linux will accept their inverses without complaint, though - 'noexec' is counteracted by 'exec', 'nosuid' by 'suid', etc. Add support for passing these options at the command line to disable our explicit forcing of security options. This also cleans up mount option handling significantly. We are still parsing options in more than one place, which isn't good, but option parsing for bind and tmpfs mounts has been unified. Fixes: containers#3819 Fixes: containers#3803 Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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