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[Bug 1917184] [NEW] qemu-user vm86() segfaults handling interrupt with s
From: |
Jeffrey |
Subject: |
[Bug 1917184] [NEW] qemu-user vm86() segfaults handling interrupt with ss:sp in same page as cs:ip |
Date: |
Sat, 27 Feb 2021 23:59:20 -0000 |
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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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.
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