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[Qemu-devel] [Bug 1192344] [NEW] qemu crashes on unaligned extended disk
From: |
Andrew McGowen |
Subject: |
[Qemu-devel] [Bug 1192344] [NEW] qemu crashes on unaligned extended disk reads |
Date: |
Tue, 18 Jun 2013 21:23:31 -0000 |
Public bug reported:
When performing a BIOS extended disk read (INT 13H, AH=0x42), if the
offset of the buffer destination in the DAP (disk address packet) is not
dword-aligned (i.e. a multiple of 4), SeaBIOS attempts to execute code
at non-mapped address 0xb4f53, causing QEMU to crash. I imagine it's a
bug in the BIOS code, but it does cause QEMU to crash.
QEMU version: 1.4.0 (Debian 1.4.0+dfsg-1expubuntu4) (from Ubuntu repository)
SeaBIOS version: 1.7.2-20130119_170942-roseapple
command line: qemu-system-x86_64 -m 64 -hda hda.img -monitor stdio
CPU: Intel Core i7 CPU M620 on a Dell Latitude E6410
OS: Ubuntu, GNU/Linux 3.8.0-25-generic, 64-bit
** Affects: qemu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1192344
Title:
qemu crashes on unaligned extended disk reads
Status in QEMU:
New
Bug description:
When performing a BIOS extended disk read (INT 13H, AH=0x42), if the
offset of the buffer destination in the DAP (disk address packet) is
not dword-aligned (i.e. a multiple of 4), SeaBIOS attempts to execute
code at non-mapped address 0xb4f53, causing QEMU to crash. I imagine
it's a bug in the BIOS code, but it does cause QEMU to crash.
QEMU version: 1.4.0 (Debian 1.4.0+dfsg-1expubuntu4) (from Ubuntu repository)
SeaBIOS version: 1.7.2-20130119_170942-roseapple
command line: qemu-system-x86_64 -m 64 -hda hda.img -monitor stdio
CPU: Intel Core i7 CPU M620 on a Dell Latitude E6410
OS: Ubuntu, GNU/Linux 3.8.0-25-generic, 64-bit
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