Re: [PATCH v2 0/4] Atomic addfd send and reply

Christian Brauner
2021-05-21T15:45:18Z

On Mon, May 17, 2021 at 12:39:04PM -0700, Sargun Dhillon wrote:
> This is somewhat of a respin of "Handle seccomp notification preemption"
> but without the controversial parts.
>
>
> This patchset addresses a race condition we've dealt with recently with
> seccomp. Specifically programs interrupting syscalls while they're in
> progress. This was exacerbated by Golang's recent adoption of "async
> preemption", in which they try to interrupt any syscall that's been running
> for more than 10ms during GC. During certain syscalls, it's non-trivial to
> write them in a reetrant manner in userspace (socket).
>
> It focuses on one use cases, which is adding file descriptors to a process
> "atomically" during the seccomp reply, as opposed to discretizing the calls
> which may result in a potential file descriptor leak and inconsistent
> program state.

Looks good,
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>