syscall: use O_PATH for held directory traversal - #1065
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Use O_PATH on Linux for directory descriptors used only for path traversal, fchdir(), or as *at() parents. Reopen final directory endpoints with the caller-requested access mode and retain the existing O_RDONLY fallback elsewhere. Add coverage for exact sources and readable descendants beneath search-only directories, known-file creation beneath write/search-only destinations, and retained refusal to enumerate unreadable directories. Fixes RsyncProject#1064.
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Use
O_PATHon Linux for directory descriptors used only for path traversal,fchdir(), or as*at()parents. Reopen final directory endpoints with the caller-requested access mode and retain the existingO_RDONLYfallback elsewhere.Add coverage for exact sources and readable descendants beneath search-only directories, known-file creation beneath write/search-only destinations, and retained refusal to enumerate unreadable directories.
Fixes #1064.