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W^X support? #13

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mcandre opened this issue Feb 11, 2019 · 3 comments
Open

W^X support? #13

mcandre opened this issue Feb 11, 2019 · 3 comments

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@mcandre
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mcandre commented Feb 11, 2019

Could the CloudABI runtime support an option to enforce W^X, in order to reduce the attack surface further? This would minimize the risk of escaping out of the CloudABI runtime into the host.
@EdSchouten
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Hi there!

CloudABI already enforces W^X, right? At least, that's what both the userspace emulator and the FreeBSD kernel implementation do.

@EdSchouten
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cloudabi/cloudabi.txt

Lines 579 to 580 in a3ae008

| This implementation enforces the `W^X` property: Pages cannot be
| mapped for execution while also mapped for writing.

@mcandre
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mcandre commented Mar 2, 2019 •
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@EdSchouten Fascinating! What about macOS? Debian?

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@mcandre @EdSchouten