VirtualBox

Ticket #7052 (closed defect: fixed)

Opened 4 years ago

Last modified 4 years ago

VBox causes host VGA/SVGA application segfault when the application does VGA port IO -> fixed in SVN/3.2.6

Reported by: wzis Owned by:
Priority: blocker Component: host support
Version: VirtualBox 3.2.4 Keywords:
Cc: Guest type: other
Host type: Linux

Description

I have a Chinese/Japanese/Korean console terminal emulator which runs on Linux console virtual screens. The application will do VGA port in/out for displaying the CJK characters. The application ran fine before any VM in VBox starts. What I found is, once a VM in Vbox starts, ioperm call can still succeed, but any port_in/port_out to VGA ports (e.g. CRT_I/D, SEQ_I/D) on the Linux host (not Linux VM) will segfault. The issue remains even after all VM stopped and VBox processes exited. In other words: Only reboot of the host can fix the issue. I've tested with VMware server, and found no issue with VMWare. So, confirm this is a VBox compatibility issue.

Change History

comment:1 Changed 4 years ago by wzis

The issue can be reproduced with the following simple C program (save it as /tmp/vga.c):

#include <stdio.h> #include <sys/io.h>

int main() { ioperm(0x3b4, 0x3df-0x3b4+1, 1); outb(0, 0x3d4) printf("CRT(0)=%d\n", inb(0x3d5)); }

/*----- end of the program -----*/

# cd /tmp # cc -o vga vga.c # chmod +s vga # ./vga

and then try to start a VM. Run /tmp/vga again, you will see the segmentation fault.

comment:2 Changed 4 years ago by wzis

Sorry, missing a ";" after the call to outb(0, 0x3d4).

comment:3 Changed 4 years ago by sandervl73

  • Summary changed from VBox causes host VGA/SVGA application segfault when the application does VGA port IO to VBox causes host VGA/SVGA application segfault when the application does VGA port IO -> fixed in SVN/3.2.6

Thanks for the report. Fixed in the next maintenance release.

comment:4 Changed 4 years ago by frank

  • Status changed from new to closed
  • Resolution set to fixed
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