Fix GH-19320: Prevent FPM UID and GID overflow - #22986
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FPM parses numeric
user,group,listen.owner, andlisten.groupvalues withstrtoul(), but stores them in signedintfields. That can silently change an ID before it reachessetuid(),setgid(), orchown().This stores the values in
uid_t/gid_tand rejects IDs that the platform types cannot represent during config validation. It also rejects the all-bits-one value used bychown()as its no-change sentinel.I added coverage for all four numeric directives and ran the full FPM test suite.
Fixes GH-19320