[Bug 2028810] Re: rsync 3.1.3 performance regression

[Ye Lu]

Hi Lena, thanks for getting back to this and appreciate your effort in putting up the PPA! 
I think the major concerns here is that the security patch changed the behavior on how arguments from the remote side were handled. And adding the new flag a) doesn't break any existing usage of the tool, and b) will give users the option to get back the old behavior and performance before we introduced the security path series. What do you think?

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Title:
  rsync 3.1.3 performance regression

Status in rsync package in Ubuntu:
  Fix Released
Status in rsync source package in Focal:
  Incomplete

Bug description:
  OS: Ubuntu 20.04 Focal
  Package: rsync 3.1.3-8ubuntu0.5

  rsync's performance was regressed by ~7x amount after some security
  patch (debian/patches/CVE-2022-29154-*) was applied to the package,
  and introduced a list of filters that iterate on every file being
  transferred. We think that was where the performance regression came
  from.

  A Jammy version of the package (3.2.5) introduced a new flag "--trust-
  sender" that allowed user to avoid the expensive client-side filtering
  introduced by those security patches. After pulling this change
  (https://github.com/WayneD/rsync/commit/cff8f044776c5143a5b270969d4bb0f1fea8b017)
  from rsync ourselves and applied it to the Focal version, the
  performance regression went away.

  The patch we used to backport our Focal rsync is attached in this
  thread. Can you please backport it too?

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