From: halfdog <me@halfdog.net>
To: Bug 1813201 <1813201@bugs.launchpad.net>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [Bug 1813201] [NEW] QEMU TCG i386 / x86_64 system emulation crash when executing int instruction
Date: Wed, 30 Jan 2019 18:06:12 +0000 [thread overview]
Message-ID: <2372-1548871572.684811@Aewj.Tnvx.bGcG> (raw)
In-Reply-To: <154835963658.2045.2300981728946163161.malonedeb@wampee.canonical.com>
Alberto Ortega writes:
> Public bug reported:
>
> QEMU version:
> -------------
>
> qemu from git, master branch commit
> d058a37a6e8daa8d71a6f2b613eb415b69363755
>
> Release versions are also affected.
>
> Summary:
> --------
>
> QEMU i386 and x86_64 system emulation crash when executing the following
> "int" instruction:
>
> cd08 int 8
>
> This generates a kernel NULL pointer dereference error in Linux, and a
> BSOD error in Windows.
>
> No special permissions are required to execute the instruction, any
> unprivileged user can execute it.
> ...
Funny. Does Qemu share code with VirtualBox? If so, a similar
missing CPL==0 check was fixed in Virtualbox 7 years ago.
https://www.halfdog.net/Security/2012/VirtualBoxSoftwareInterrupt0x8GuestCrash/
next prev parent reply other threads:[~2019-01-30 18:07 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-24 19:53 [Qemu-devel] [Bug 1813201] [NEW] QEMU TCG i386 / x86_64 system emulation crash when executing int instruction Alberto Ortega
2019-01-30 18:06 ` halfdog [this message]
2020-11-21 22:48 ` [Bug 1813201] " Peter Maydell
2021-01-21 18:15 ` Thomas Huth
2021-04-30 7:18 ` Thomas Huth
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