bubblewrap: Add --not-a-security-boundary flag to enable fail-open behavior#751
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ao2 wants to merge 1 commit intocontainers:mainfrom
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bubblewrap: Add --not-a-security-boundary flag to enable fail-open behavior#751ao2 wants to merge 1 commit intocontainers:mainfrom
--not-a-security-boundary flag to enable fail-open behavior#751ao2 wants to merge 1 commit intocontainers:mainfrom
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…behavior Some callers of bwrap (e.g. xdg-dbus-proxy, Steam Runtime) use it purely to adjust filesystem layout, without any expectation of a security boundary between the sandbox and the host. For these callers, hard failures during sandbox setup (such as an automount timeout on a bind source) are unnecessarily fatal. So add a new `--not-a-security-boundary` option that can be used to relax the bubblewrap behavior in these specific cases, and allow it to "fail-open". NOTE: The `failing_path` variable in setup_op_bind_mount() is annotated with`cleanup_free` so that the allocation made by `bind_mount()` on the error path is not leaked now that there is a non-fatal return path. Signed-off-by: Antonio Ospite <antonio.ospite@collabora.com>
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--not-a-security-boundary flag to enable fail-open …--not-a-security-boundary flag to enable fail-open behavior
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cc @smcv even though it's still a draft |
smcv
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May 7, 2026
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| * Maybe we want to handle opt_not_a_security_boundary inside bind_mount | ||
| * itself? |
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Yes, I think that would be a better place to do it.
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Some callers of bwrap (e.g. xdg-dbus-proxy, Steam Runtime) use it purely to adjust filesystem layout, without any expectation of a security boundary between the sandbox and the host.
For these callers, hard failures during sandbox setup (such as an automount timeout on a bind source) are unnecessarily fatal.
So add a new
--not-a-security-boundaryoption that can be used to relax the bubblewrap behavior in these specific cases, and allow it to "fail-open".