Honor filesystem permissions for app file uploads - #38416
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## Why App tool file arguments could read and upload files without applying the active filesystem sandbox policy. ## What changed - Apply the effective filesystem policy, including session and turn grants, when reading metadata and streaming files for upload. - Reject uploads before contacting the files endpoint when the selected path is denied. - Report an error when the executor cannot provide sandboxed file streaming for a restricted policy. ## Testing Added integration coverage showing that restricted policies allow permitted files and reject denied files before upload. GitOrigin-RevId: 63b239c5066dcb9d18b5050089c659fb2a784909
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Honor filesystem permissions for app file uploads
Why
App tool file arguments could read and upload files without applying the active
filesystem sandbox policy.
What changed
reading metadata and streaming files for upload.
denied.
a restricted policy.
Testing
Added integration coverage showing that restricted policies allow permitted
files and reject denied files before upload.