bugdavfs2 - Bugs: bug #63771, davfs2 1.7.0 crashes when working...


bug #63771: davfs2 1.7.0 crashes when working with nginx dav module and special chars

Submitter:  None
Submitted:  Tue 07 Feb 2023 12:55:26 AM UTC
Category:  None Severity:  3 - Normal
Item Group:  None Status:  None
Privacy:  Public Assigned to:  None
Open/Closed:  Open
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Fri 31 Mar 2023 10:27:05 AM UTC, comment #3: 

it happened again - I assume this is due to a corrupted file, which determines what belongs in lost+found and what is a regular file in cache.

cleaning the user cache files solves the problem for "some time"

Tue 21 Mar 2023 10:05:12 AM UTC, comment #2: 

This bug also arises, when you have files in lost+found and try to acess them:

cd lost+found/
[marc@localhost lost+found]$ ls
ls: cannot access 'dir-lost+found-xhbokx': Software caused connection abort
ls: cannot access 'dir-lost+found-rLn3pO': Transport endpoint is not connected

Mon 20 Mar 2023 11:27:21 AM UTC, comment #1: 

I can confirm this bug too. In my case I could only resolve it, by removing all cached files.

Tue 07 Feb 2023 12:55:26 AM UTC, original submission:  


1. Setup an Nginx server with dav module enabled.
2. On another server, mount the resource serving by nginx.
3. In the mounted directory, create a file contains '[', e.g.

 echo test | tee 'mounted/[test]'

4. Try to cat the content, dmesg will show a crash something like

[145885.623406] mount.davfs[82429]: segfault at 18 ip 000055ce8851c8ec sp 00007ffce9ccd540 error 4 in mount.davfs[55ce88515000+15000] likely on CPU 0 (core 0, socket 0)
[145885.623416] Code: 00 48 c7 44 24 08 00 00 00 00 48 8b 7b 20 48 8d 74 24 08 67 e8 b5 b6 00 00 85 c0 0f 85 69 ff ff ff 48 8b 7c 24 08 49 8b 5d 00 <48> 8b 47 18 48 39 43 48 74 54 48 89 43 48 48 8b 43 30 48 85 c0 74
[145885.623494] audit: type=1701 audit(1675728425.394:461): auid=972 uid=65534 gid=90 ses=5 pid=82429 comm="mount.davfs" exe="/usr/bin/mount.davfs" sig=11 res=1

The Nginx config (block)

location /dav/ {
    alias /tmp/;
    client_body_temp_path /tmp/nginx/;
    charset utf-8;
    dav_access user:rw group:rw all:rw;
    dav_ext_methods PROPFIND OPTIONS;
    create_full_put_path on;
    autoindex on;


I tried using this simple script as webdav server: https://gist.github.com/mickael-kerjean/f2f034bdad5e077edcbfdff649d52d68

And the above steps won't make any crashes, the file content can be normally shown.

Server OS is Ubuntu 22.04 LTS.
Client (who runs mount.davfs) OS is Arch, davfs2 installed from AUR (https://aur.archlinux.org/packages/davfs2)



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