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Fix Linux sandbox startup with multiple denied files - #50059
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## Why Bubblewrap consumes and closes the file descriptor for each `--ro-bind-data` mount. Reusing one descriptor across multiple file masks prevents the sandbox from starting. ## What changed Open and preserve a separate `/dev/null` descriptor for each empty-file mask. ## Testing Extend unit tests to verify distinct descriptors for multiple denied files and missing-path masks. Add integration coverage for exact-path and glob deny rules, checking that the sandbox starts, denied files remain unreadable and unwritable, and allowed files remain accessible. GitOrigin-RevId: 85158c83699afd36bb7aca453b2652d777cf65e4
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Fix Linux sandbox startup with multiple denied files
Why
Bubblewrap consumes and closes the file descriptor for each
--ro-bind-datamount. Reusing one descriptor across multiple file masks prevents the sandbox from starting.What changed
Open and preserve a separate
/dev/nulldescriptor for each empty-file mask.Testing
Extend unit tests to verify distinct descriptors for multiple denied files and missing-path masks. Add integration coverage for exact-path and glob deny rules, checking that the sandbox starts, denied files remain unreadable and unwritable, and allowed files remain accessible.