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Robert Foggia of Trustwave reported that read_tablespace_map() fails to prevent an overrun of its on-stack input buffer. Since the tablespace map file is presumed trustworthy, this does not seem like an interesting security vulnerability, but still we should fix it just in the name of robustness. While here, document that pg_basebackup's --tablespace-mapping option doesn't work with tar-format output, because it doesn't. To make it work, we'd have to modify the tablespace_map file within the tarball sent by the server, which might be possible but I'm not volunteering. (Less-painful solutions would require changing the basebackup protocol so that the source server could adjust the map. That's not very appetizing either.) |
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