不定式的被动式和完成式可以作主语吗

不定式的完成式和被动式都可用作主语的。你的两个句子也是可以的。又如：

▲不定式的被动式作主语

To be appreciated as a parent is quite unusual. 可怜天下父母心。（《柯林斯Cobuild高阶英汉双解学习词典》)

To be attacked by the enemy is not a bad thing, but a good thing. 被敌人反对是好事，不是坏事。（《薄冰高级英语语法》）

To be offered a place at such a good university is quite an achievement. 获得这样好的大学录取是件很了不起的事。《牛津英语搭配词典》

▲不定式的完成式作主语

To have known her is a privilege. 认识了她真是荣幸。（《薄冰高级英语语法》）

To have made the same mistake twice was unforgivable. 两次犯同样的错误是不可原谅的。（《牛津实用英语语法》第四版）

To have told my secret would have given me away. 要是讲出了我的秘密就是把我自己出卖了。（《张道真英语语法》）