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joncampbell123 / dosbox-x

DOSBox-X fork of the DOSBox project
GNU General Public License v2.0
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Segfault on write to overlay dir when starting from a ZIP #4994

Closed unmacaque closed 3 months ago

unmacaque commented 4 months ago

Describe the bug

When attempting to save in any game that is started from a ZIP file and using an overlay directory, dosbox-x crashes with a SIGSEGV. The overlay directory will contain 0 byte files named after the files that should have been written.

The attached output log contains a gdb trace.

Used vanilla configuration. Seems to occur regardless of filesystem or tested game.

Steps to reproduce the behaviour

  1. Create a ZIP archive of any game that offers a save feature (I tried Simcity 2000)
  2. Start dosbox-x
  3. mount C "/home/user/path/to/game.zip"
  4. mount C "/home/user/anotherpath" -t overlay
  5. Launch game
  6. Save in game or wait for game to write any file to disk

Expected behavior

Expected dosbox-x to not crash and the save file to be properly written to the overlay dir

What operating system(s) this bug have occurred on?

Arch Linux x86_64

What version(s) of DOSBox-X have this bug?

2024.03.01

Used configuration

No response

Output log

GNU gdb (GDB) 14.2
Copyright (C) 2023 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-pc-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
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Reading symbols from dosbox-x...
Reading symbols from /usr/lib/debug/usr/bin/dosbox-x.debug...
(No debugging symbols found in /usr/lib/debug/usr/bin/dosbox-x.debug)
(gdb) run
Starting program: /usr/bin/dosbox-x
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
LOG: Early LOG Init complete
LOG: DOSBox-X's working directory: /home/andy
LOG: Logging init: beginning logging proper. This is the end of the early init logging
LOG: Logging: No logfile was given. All further logging will be discarded.
LOG: DOSBox-X version 2024.03.01 Commit 02f36ba (Linux SDL1 64-bit)
[New Thread 0x75b8bc6006c0 (LWP 73021)]
Warning: XMODIFIERS is unspecified
[New Thread 0x75b8b76006c0 (LWP 73022)]
[Thread 0x75b8b76006c0 (LWP 73022) exited]
LOG: Current X11 keyboard layout (token) is: 'us'
LOG: Host keyboard layout is now us (US English)
LOG: Mapper keyboard layout is now us (US English)
LOG: SDL1 auto-detected desktop as 1920 x 1080
LOG: The default output for the video system: surface
LOG: Configured windowposition: -
LOG: X11 main window is 640 x 400 maximized=0
LOG: X11 extension XRANDR is available
LOG: XRandR CRTC 0: pos=(0,0) size=(1920,1080) outputs=1
LOG: Our window lies on this CRTC display (window pos=(86,120) size=(640,400) match=(406,320)).
LOG:   Goes to output 0: name='HDMI-1' size_mm=(530 x 300)
LOG: Screen report: Method 'XRandR' (1920.000 x 1080.000 pixels) at (0.000 x 0.000) (530.000 x 300.000 mm) (20.866 x 11.811 in) (92.015 x 91.440 DPI)
LOG: Current X11 keyboard layout (token) is: 'us'
LOG: SDL_mapper: US keyboard detected, set usescancodes=false
LOG: ISA BCLK: 8333333.333Hz (25000000/3)
LOG: monopal: green,
LOG: Active save slot: 1 [Empty]
LOG: USING AVI+ZMBV
LOG: Max 3670016 sz 16384
LOG: Final 16384
[New Thread 0x75b8b76006c0 (LWP 73025)]
LOG: SDLNet_TCP_Open: Couldn't connect to remote host
LOG: TiMidity: can't open control connection (host=127.0.0.1, port=7777)
LOG: MIDI:fluidsynth: SoundFont not specified, and no system SoundFont found
LOG: MIDI:synth: Specify .SF2 sound font file with midiconfig=
LOG: MT32: failed to locate ROMs.
LOG: MT32 emulation requires the PCM and CONTROL ROM files.
LOG: To eliminate this error message, check the DOSBox-X wiki.
LOG: The ROM files are: CM32L_CONTROL.ROM and CM32L_PCM.ROM or MT32_CONTROL.ROM and MT32_PCM.ROM
LOG: MIDI:Opened device:none
LOG: Pentium CMPXCHG8B emulation is enabled
LOG: VOODOO LFB now at d0000000
LOG: Serial1: BASE 3f8h
LOG: Serial2: BASE 2f8h
LOG: Parallel1: BASE 378h
LOG: MPU-401 Registering I/O ports as if IBM PC MPU-401 at base 330h
LOG: Memory I/O complexity optimization enabled aka option 'memory io optimization 1'. If the game or demo is unable to draw to the screen properly, set the option to false.
LOG: The 'scanline render on demand' option is available and may provide a modest boost in video render performance if set to true.
LOG: GetDesktopResolution reading X11 desktop resolution
LOG: Root window (ID 1183) is 1920 x 1080
LOG: X11 main window is 640 x 400 maximized=0
LOG: XRandR CRTC 0: pos=(0,0) size=(1920,1080) outputs=1
LOG: Our window lies on this CRTC display (window pos=(86,120) size=(640,400) match=(406,320)).
LOG:   Goes to output 0: name='HDMI-1' size_mm=(530 x 300)
LOG: Screen report: Method 'XRandR' (1920.000 x 1080.000 pixels) at (0.000 x 0.000) (530.000 x 300.000 mm) (20.866 x 11.811 in) (92.015 x 91.440 DPI)
LOG: Allocated APM BIOS pm entry point at f000:ce40
LOG: Writing code to fce40
LOG: Writing code to fce60
LOG: X11 main window is 640 x 400 maximized=0
LOG: XRandR CRTC 0: pos=(0,0) size=(1920,1080) outputs=1
LOG: Our window lies on this CRTC display (window pos=(86,120) size=(640,400) match=(406,320)).
LOG:   Goes to output 0: name='HDMI-1' size_mm=(530 x 300)
LOG: Screen report: Method 'XRandR' (1920.000 x 1080.000 pixels) at (0.000 x 0.000) (530.000 x 300.000 mm) (20.866 x 11.811 in) (92.015 x 91.440 DPI)
LOG: ISA Plug & Play BIOS enabled
LOG: VGA ROM BIOS init callback
LOG: pixratio 1.000, dw false, dh false
LOG: Aspect ratio: 640 x 480  xToY=1.333 yToX=0.750
LOG: menuScale=1
LOG: surface consider=640x497 final=640x497
LOG: X11 main window is 640 x 497 maximized=0
LOG: XRandR CRTC 0: pos=(0,0) size=(1920,1080) outputs=1
LOG: Our window lies on this CRTC display (window pos=(86,120) size=(640,497) match=(406,368)).
LOG:   Goes to output 0: name='HDMI-1' size_mm=(530 x 300)
LOG: Screen report: Method 'XRandR' (1920.000 x 1080.000 pixels) at (0.000 x 0.000) (530.000 x 300.000 mm) (20.866 x 11.811 in) (92.015 x 91.440 DPI)
LOG: WARNING: No translation support (to host) for code page 0
LOG:    3017787 ERROR BIOS:Keyboard layout file auto not found
LOG:    3017787 ERROR BIOS:Keyboard layout file auto not found
LOG: XMS: 50 handles allocated for use by the DOS environment
LOG: EMS page frame at 0xe000-0xefff
LOG: COMMAND.COM env size:             720 bytes
LOG: COMMAND.COM environment block:    0x0701 sz=0x002d
LOG: COMMAND.COM main body (PSP):      0x072f sz=0x009a
LOG: COMMAND.COM stack:                0x0749
LOG: pixratio 1.350, dw false, dh false
LOG: Aspect ratio: 720 x 540  xToY=1.333 yToX=0.750
LOG: menuScale=1
LOG: surface consider=720x417 final=720x417
LOG: X11 main window is 720 x 417 maximized=0
LOG: XRandR CRTC 0: pos=(0,0) size=(1920,1080) outputs=1
LOG: Our window lies on this CRTC display (window pos=(86,120) size=(720,417) match=(446,328)).
LOG:   Goes to output 0: name='HDMI-1' size_mm=(530 x 300)
LOG: Screen report: Method 'XRandR' (1920.000 x 1080.000 pixels) at (0.000 x 0.000) (530.000 x 300.000 mm) (20.866 x 11.811 in) (92.015 x 91.440 DPI)
LOG:    3052022 ERROR BIOS:INT15:Unknown call ax=BFDE
LOG:    3052100 ERROR BIOS:INT15:Unknown call ax=BFDE
LOG: DOSBox-X has switched to max cycles, because of the setting: cycles=auto.
If the game runs too fast, try a fixed cycles amount in DOSBox-X's options.
LOG:    3066914 ERROR BIOS:INT15:Unknown call ax=BF01
LOG:    5589855 ERROR BIOS:INT15:Unknown call ax=BFDE
LOG:    5597019 ERROR BIOS:INT15:Unknown call ax=BFDE
LOG:   17970978 ERROR MOUSE:Unhandled videomode 69 on reset
LOG: pixratio 1.000, dw false, dh false
LOG: Aspect ratio: 640 x 480  xToY=1.333 yToX=0.750
LOG: menuScale=1
LOG: surface consider=640x497 final=640x497
LOG: X11 main window is 640 x 497 maximized=0
LOG: XRandR CRTC 0: pos=(0,0) size=(1920,1080) outputs=1
LOG: Our window lies on this CRTC display (window pos=(86,120) size=(640,497) match=(406,368)).
LOG:   Goes to output 0: name='HDMI-1' size_mm=(530 x 300)
LOG: Screen report: Method 'XRandR' (1920.000 x 1080.000 pixels) at (0.000 x 0.000) (530.000 x 300.000 mm) (20.866 x 11.811 in) (92.015 x 91.440 DPI)
LOG:   18041048 ERROR MOUSE:Unhandled videomode 69 on reset

Thread 1 "dosbox-x" received signal SIGSEGV, Segmentation fault.
0x0000568f4706d5bf in physfsFile::prepareWrite() ()
(gdb) bt full
#0  0x0000568f4706d5bf in physfsFile::prepareWrite() ()
#1  0x0000568f4706d7f8 in physfsFile::Write(unsigned char const*, unsigned short*) ()
#2  0x0000568f46fc06f8 in DOS_WriteFile(unsigned short, unsigned char const*, unsigned short*, bool) ()
#3  0x0000568f46fad4cf in DOS_21Handler() ()
#4  0x0000568f46efe106 in Normal_Loop() ()
#5  0x0000568f46efe39e in DOSBOX_RunMachine() ()
#6  0x0000568f4746b322 in CALLBACK_RunRealInt(unsigned char) ()
#7  0x0000568f471133ba in DOS_Shell::Execute(char*, char const*) ()
#8  0x0000568f470f6ce7 in DOS_Shell::DoCommand(char*) ()
#9  0x0000568f470dbc00 in DOS_Shell::ParseLine(char*) ()
#10 0x0000568f470dc79b in DOS_Shell::Run() ()
#11 0x0000568f470e6374 in SHELL_Run() ()
#12 0x0000568f471bfd1d in VM_Boot_DOSBox_Kernel() ()
#13 0x0000568f471661ed in BIOS::cb_bios_boot__func() ()
#14 0x0000568f46efe106 in Normal_Loop() ()
#15 0x0000568f46efe39e in DOSBOX_RunMachine() ()
#16 0x0000568f46e99bc2 in main ()

Additional information

When used individually, the ZIP launch and overlay dir features work fine.

Have you checked that no similar bug report(s) exist?

Code of Conduct & Contributing Guidelines

grapeli commented 4 months ago

I reported this bug a year and a half ago. https://github.com/joncampbell123/dosbox-x/issues/3535#issuecomment-1242416569

Remove or comment out this code and it will work perfectly fine.

//#ifndef WIN32
//              fcntl(**(int**)fhandle->opaque,F_SETFL,0);
//#endif
joncampbell123 commented 3 months ago

I reported this bug a year and a half ago. #3535 (comment)

Remove or comment out this code and it will work perfectly fine.

//#ifndef WIN32
//              fcntl(**(int**)fhandle->opaque,F_SETFL,0);
//#endif

That might explain why the crash does not happen here on Linux.

joncampbell123 commented 3 months ago

Looking at the physfs code, I have a few questions. If the Windows-specific code is using CreateFileW(), why the hacky fcntl() on file handle typecast from int** pointer? It's unnecessary.

What was the original intent? To clear O_TEXT?

I think it's best to fix this issue by just removing the code.

joncampbell123 commented 3 months ago

Now I'm going to pull out my Windows 11 laptop and see if I can mount a ZIP and overlay, and write a file without segfaulting.

joncampbell123 commented 3 months ago

Looks good.