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Data loss caused by move to SMB share #653

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eandmsz opened this issue Apr 28, 2019 · 3 comments

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@eandmsz
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commented Apr 28, 2019

fman: 1.5.8
OS: kubuntu 19.04

I have tried to move a file to a mounted SMB share where I don't have write permission because the network share was mounted as root (in rw mode), but I was not running fman as root.

Fman warned: "Error copying example.txt (permission denied). Do you want to continue?"
Yes, Yes to all, Abort

I pressed "Yes" and guess what: the file didn't got copied obviously, but it got deleted from the source location.
"Yes to all" can destroy multiple files this way.

I think this is a critical bug as it leads to data loss.

@mherrmann

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commented Apr 29, 2019

Very sorry for the trouble. Unfortunately, I cannot reproduce this. Here's what I tried:

  1. I created a folder owned by root.
  2. I selected two files in fman.
  3. I pressed F6 to move the two files into the folder from step 1.

As expected, fman opened a dialog Error moving - permission denied. Do you want to continue?. Like you said, I then pressed Yes. This resulted in another Error moving alert. However! The files were not deleted in the source folder.

Are you sure this is reproducible?

@eandmsz

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commented Apr 29, 2019

No problem, I haven't lost anything serious.
Yes it's reproducible, but if you just try to copy a file on a local filesystem where you don't have access then the bug will not occur.

But I have found an easier way to reproduce it (without setting up a test network with Samba and everything):

Create an ISO file (or download any CD image from somewhere)

touch /tmp/somefile
mkisofs -o /tmp/example.iso /tmp/somefile

Mount the ISO file as loop device (will be mounted as readonly)

mkdir /mnt/testdir
sudo mount -o loop /tmp/example.iso /mnt/testdir

Test it:

touch /tmp/testfile
mv /tmp/testfile /mnt/testdir

...it will complain that the filesystem is read-only, but the testfile will remain in place, however if you try to move the testfile with fman, it will get deleted

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commented Apr 30, 2019

Fixed in fman 1.5.9. Sorry again for the trouble.

@mherrmann mherrmann closed this Apr 30, 2019

@mherrmann mherrmann removed the in progress label Apr 30, 2019

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