[Bug 1912107] Re: Option to constrain linux-user exec() to emulated CPU only

[Thomas Huth]

The QEMU project is currently moving its bug tracking to another system.
For this we need to know which bugs are still valid and which could be
closed already. Thus we are setting the bug state to "Incomplete" now.

If the bug has already been fixed in the latest upstream version of QEMU,
then please close this ticket as "Fix released".

If it is not fixed yet and you think that this bug report here is still
valid, then you have two options:

1) If you already have an account on gitlab.com, please open a new ticket
for this problem in our new tracker here:

    https://gitlab.com/qemu-project/qemu/-/issues

and then close this ticket here on Launchpad (or let it expire auto-
matically after 60 days). Please mention the URL of this bug ticket on
Launchpad in the new ticket on GitLab.

2) If you don't have an account on gitlab.com and don't intend to get
one, but still would like to keep this ticket opened, then please switch
the state back to "New" or "Confirmed" within the next 60 days (other-
wise it will get closed as "Expired"). We will then eventually migrate
the ticket automatically to the new system (but you won't be the reporter
of the bug in the new system and thus you won't get notified on changes
anymore).

Thank you and sorry for the inconvenience.


** Tags added: feature-request linux-user

** Changed in: qemu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1912107

Title:
  Option to constrain linux-user exec() to emulated CPU only

Status in QEMU:
  Incomplete

Bug description:
  When trying to reproduce a bug someone reported on an actual AMD K10[1], ​I 
tried to directly throw `qemu_x86-64 -cpu 
  ​phenom path/to/wrongly-labelled-instruction-set/gcc 1.c` at the problem, but 
failed to get an "illegal instruction" as expected. A quick investigation 
reveals that the error is actually caused by one of gcc's child processess, and 
that the said process is being ran directly on the host. A similar problem 
happens with trying to call stuff with /usr/bin/env.

   ​[1]: https://github.com/Homebrew/brew/issues/1034

  Since both the host and the guest are x86_64, I deemed binfmt
  inapplicable to my case. I believe that QEMU should offer a way to
  modify exec() and other spawning syscalls so that execution remains on
  an emulated CPU in such a case. Call it an extra layer of binfmt, if
  you must.

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