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iangudger | 7 years ago

I work on gVisor. gVisor supports concurrent multi-treading, but should not be vulnerable to TOCTTOU, even in ptrace mode. gVisor handles system calls itself, it does not simply verify the args for app system calls and then pass them on to the host. That said, if you find any security issues, please let us know. There is a security email address in the github issue template.

App Engine Flex is a version of App Engine that uses VMs with Linux. You can find a comparison between the standard and flexible environments here:

https://cloud.google.com/appengine/docs/the-appengine-enviro...

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