fix: page_align_up overflow

[Marsman1996]

Fix #1077 by using wrapping_add.

However, RedoxOS and Asterinas use checked_add.
But change to checked_add in DragonOS will lead to a lot of code changes.

https://gitlab.redox-os.org/redox-os/relibc/-/merge_requests/569

https://github.com/asterinas/asterinas/blob/c0e572becdac63d814b460875dccb9d833d2b06d/ostd/libs/align_ext/src/lib.rs#L51-L54

[dragonosbot]

感谢您的pull request，欢迎加入！🎉 DragonOS社区很兴奋地期待审核您的更改，您将在接下来的两周内收到 @fslongjin @GnoCiYeH @chiichen (NB. this repo may be misconfigured) 的回复。💬😊

Please see the contribution instructions for more information. Namely, in order to ensure the minimum review times lag, PR authors and assigned reviewers should ensure that the review label (S-等待审查 and S-等待作者修改) stays updated, invoking these commands when appropriate:

• @dragonosbot author: 审查结束后，PR的作者应检查评论并采取相应行动
• @dragonosbot review: 作者已完成修改，将此PR提交给reviewer进行审阅，此PR将再次在审阅者队列中排队

[fslongjin]

checked_add 的话，有什么影响吗~

[Marsman1996]

如果改用 checked_add，发生溢出时 checked_add 返回 None，那么我们需要类似 RedoxOS 的这个 PR
修改 page_align_up 的返回类型并在每个调用位置进行异常处理

[Marsman1996]

It seems DragonOS shall not call page_align_up for start of msync.

DragonOS/kernel/src/syscall/mod.rs

Line 1171 in 72423f9

let start = page_align_up(args[0]);

Linux just return EINVAL when start unaligned.

https://elixir.bootlin.com/linux/v6.10.5/source/mm/msync.c#L44-L45

---

如果与 Linux 兼容的话，DragonOS 似乎不应该为 msync 的 start 做页对齐，因为当不对齐时 Linux 直接返回 EINVAL 了