I made a tweet claiming that Linux is behind on security mitigations. This post is to outline mitigations added to platforms such as Windows, MacOS, and even ChromeOS that have yet to see the light of day on the linux desktop.
(Btw, Andrew Kelley is my hero!)
Linux distros are behind on implementing modern binary exploit mitigations. The last thing Linux userspace has done is ASLR/PIE and stack canaries: this hasen't changed for years. Windows and MacOS enforce signature checking on all binaries. glibc's allocator is primitive compared to LLVM's Scudo allocator, which mitigates use-after-frees and heap overflows.
Windows signs heap pages to ensure they're immutable, in addition to hardware-enforced control flow protection. Modern iOS does this too. Windows also implemented something exciting called a shadow stack, which stores return addresses in a secret, seperate stack from local variables. This is both faster and more secure than stack cookies.
Linux distros have no concept of sandboxing, or any meaningful application security model. Any app running under Xorg can see the contents of any other app runing under Xorg. Flatpack and snap are both security nightmares , fundamentally flawed and poorly implemented. The only good sandoxing API provided by the Linux kernel is seccomp-bpf, and the only program that uses it is Google Chrome/Chromium. To compare, ChromeOS requires every service to have its own seccomp filter .
Also a friendly reminder that Debian is always behind on CVEs, and I'm sure that most distros don't fare any better.
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正则表达式必知必会
Ben Forta / 杨涛、王建桥、杨晓云 / 人民邮电出版社 / 2007 / 29.00元
正则表达式是一种威力无比强大的武器，几乎在所有的程序设计语言里和计算机平台上都可以用它来完成各种复杂的文本处理工作。本书从简单的文本匹配开始，循序渐进地介绍了很多复杂内容，其中包括回溯引用、条件性求值和前后查找，等等。每章都为读者准备了许多简明又实用的示例，有助于全面、系统、快速掌握正则表达式，并运用它们去解决实际问题。 本书适合各种语言和平台的开发人员。一起来看看 《正则表达式必知必会》 这本书的介绍吧!
