[Bug 1917184] [NEW] qemu-user vm86() segfaults handling interrupt with ss:sp in same page as cs:ip

[Bug 1917184] [NEW] qemu-user vm86() segfaults handling interrupt with ss:sp in same page as cs:ip

[Jeffrey]

Public bug reported:

When using qemu-i386 to run a program that uses vm86(), if the vm86 code
calls an interrupt while cs:ip and ss:sp both point within the same
page, do_int tries to write to the page while it is not writable,
causing a segfault.

qemu version 5.2.0, x86-64 host.

** Affects: qemu
     Importance: Undecided
         Status: New

** Attachment added: "Example program"
   https://bugs.launchpad.net/bugs/1917184/+attachment/5469910/+files/vm86bug.c

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Title:
  qemu-user vm86() segfaults handling interrupt with ss:sp in same page
  as cs:ip

Status in QEMU:
  New

Bug description:
  When using qemu-i386 to run a program that uses vm86(), if the vm86
  code calls an interrupt while cs:ip and ss:sp both point within the
  same page, do_int tries to write to the page while it is not writable,
  causing a segfault.

  qemu version 5.2.0, x86-64 host.

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[Bug 1917184] Re: qemu-user vm86() segfaults handling interrupt with ss:sp in same page as cs:ip

[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: i386 tcg

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

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Title:
  qemu-user vm86() segfaults handling interrupt with ss:sp in same page
  as cs:ip

Status in QEMU:
  Incomplete

Bug description:
  When using qemu-i386 to run a program that uses vm86(), if the vm86
  code calls an interrupt while cs:ip and ss:sp both point within the
  same page, do_int tries to write to the page while it is not writable,
  causing a segfault.

  qemu version 5.2.0, x86-64 host.

To manage notifications about this bug go to:
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[Bug 1917184] Re: qemu-user vm86() segfaults handling interrupt with ss:sp in same page as cs:ip

[Jeffrey]

Bug still present in latest master

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

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https://bugs.launchpad.net/bugs/1917184

Title:
  qemu-user vm86() segfaults handling interrupt with ss:sp in same page
  as cs:ip

Status in QEMU:
  New

Bug description:
  When using qemu-i386 to run a program that uses vm86(), if the vm86
  code calls an interrupt while cs:ip and ss:sp both point within the
  same page, do_int tries to write to the page while it is not writable,
  causing a segfault.

  qemu version 5.2.0, x86-64 host.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1917184/+subscriptions

[Bug 1917184] Re: qemu-user vm86() segfaults handling interrupt with ss:sp in same page as cs:ip

[Thomas Huth]

This is an automated cleanup. This bug report has been moved to QEMU's
new bug tracker on gitlab.com and thus gets marked as 'expired' now.
Please continue with the discussion here:

 https://gitlab.com/qemu-project/qemu/-/issues/314


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

** Bug watch added: gitlab.com/qemu-project/qemu/-/issues #314
   https://gitlab.com/qemu-project/qemu/-/issues/314

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https://bugs.launchpad.net/bugs/1917184

Title:
  qemu-user vm86() segfaults handling interrupt with ss:sp in same page
  as cs:ip

Status in QEMU:
  Expired

Bug description:
  When using qemu-i386 to run a program that uses vm86(), if the vm86
  code calls an interrupt while cs:ip and ss:sp both point within the
  same page, do_int tries to write to the page while it is not writable,
  causing a segfault.

  qemu version 5.2.0, x86-64 host.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1917184/+subscriptions