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Implement directives `NoExecPaths=` and `ExecPaths=` to control `MS_NOEXEC` mount flag for the file system tree. This can be used to implement file system W^X policies, and for example with allow-listing mode (NoExecPaths=/) a compromised service would not be able to execute a shell, if that was not explicitly allowed. Example: [Service] NoExecPaths=/ ExecPaths=/usr/bin/daemon /usr/lib64 /usr/lib Closes: #17942.