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Date: Fri, 12 Jan 2018 16:58:13 +0100
From: Jakub Wilk <>
Subject: Re: Libc Realpath Buffer Underflow CVE-2018-1000001

* halfdog <>, 2018-01-11, 21:34:
>One of the weaknesses of Linux kernel is, that it is not fully POSIX 

To clarify, POSIX deliberately doesn't have concepts of "kernel" or 
"system call"[*]. If you're debating POSIX compliance, you should take 
the whole system (kernel, libc, compiler, shell and what not...) into 

That said, it's true that the current behavior of the getcwd() syscall, 
apart from being incredibly stupid, makes building a POSIX-compliant OS 
on top of the Linux kernel harder than it could be.


Jakub Wilk

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