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https://github.com/systemd/systemd/pull/14133 made capability_ambient_set_apply() acquire capabilities that were explicitly asked for and drop all others. This change means the function is called even with an empty capability set, opening up a code path for users without ambient capabilities to call this function. This function will error with EINVAL out on kernels < 4.3 because PR_CAP_AMBIENT is not understood. This turns capability_ambient_set_apply() into a noop for kernels < 4.3 Fixes https://github.com/systemd/systemd/issues/15225
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