Re: [RFC PATCH] fs: introduce mkdirat2 syscall for atomic mkdir

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On Sat Feb 27, 2021 at 9:24 PM EST, Matthew Wilcox wrote:
> Where's the problem? If mkdir succeeds in a sticky directory, others
> can't remove or rename it. So how can an app be tricked into doing
> something wrong?

It's not a security concern, it's just about about making the software
more robust.

1. Program A creates a directory
2. Program A is pre-empted
3. Program B deletes the directory
4. Program A creates a file in that directory
5. RIP




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