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pietinger
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Joined: 17 Oct 2006
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Location: Bavaria
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 Posted: Tue Dec 22, 2020 9:28 pm Post subject: Is it normal if VLC wants to write into a mkv video ? [YES] |
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... without any actions from my side causing this (editing or something else).
Today I had watched a video from youtube (downladed with youtube-dl into a .mkv-file). Later I saw in dmesg a very new audit from apparmor (my vlc profile allows only reading video files):
| Code: | | Dec 22 22:07:24 localhost kernel: [43218.558766] audit: type=1400 audit(1608671244.589:450): apparmor="DENIED" operation="open" profile="vlc" name="/hd/Youtube/*******.mkv" pid=769 comm="vlc" requested_mask="w" denied_mask="w" fsuid=1000 ouid=1000 |
Does someone knows the mkv-format and knows if this is regular or a "bad" file ? (I must add that I never saw before a write attempt from vlc to a video file).
Thanks in advance.
Last edited by pietinger on Wed Dec 23, 2020 1:04 pm; edited 1 time in total |
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mike155
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Posts: 4438
Location: Frankfurt, Germany
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| Posted: Wed Dec 23, 2020 2:41 am Post subject: |
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| Use 'strace' to find out what really happens. |
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pietinger
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Posts: 4152
Location: Bavaria
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| Posted: Wed Dec 23, 2020 1:04 pm Post subject: |
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I always forget strace - thanks for reminding me, mike. This brought me to my own mistake:
Its the filename !
The file named: "Giulia Falcone - SOS d'un terrien en détresse - Daniel Balavoine-fyMkoB29INQ.webm" brings me:
| Code: | | Dec 23 13:51:01 localhost kernel: [ 7516.830671] audit: type=1400 audit(1608727861.579:73): apparmor="DENIED" operation="open" profile="vlc" name=2F686F6D652F70657465722F4D757369632F4769756C69612046616C636F6E65202D20534F53206427756E207465727269656E20656E2064C3A974726573736520202D202044616E69656C2042616C61766F696E652D66794D6B6F423239494E512E7765626D pid=5942 comm="vlc" requested_mask="w" denied_mask="w" fsuid=1000 ouid=1000 |
When renaming the same file to "fyMkoB29INQ.webm" I have:
| Code: | | Dec 23 13:50:03 localhost kernel: [ 7458.515307] audit: type=1400 audit(1608727803.262:70): apparmor="DENIED" operation="open" profile="vlc" name="/home/peter/test/fyMkoB29INQ.webm" pid=5889 comm="vlc" requested_mask="w" denied_mask="w" fsuid=1000 ouid=1000 |
So, vlc tries to write in every file. I close this. |
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mike155
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Joined: 17 Sep 2010
Posts: 4438
Location: Frankfurt, Germany
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| Posted: Wed Dec 23, 2020 1:14 pm Post subject: |
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| pietinger wrote: | | So, vlc tries to write in every file. I close this. |
Well, not on my machine. Strace shows that vlc opens the file in read only mode.
| Code: | | 3403 openat(AT_FDCWD, "/tmp/Rammstein - Rosenrot.mkv", O_RDONLY|O_NONBLOCK|O_CLOEXEC <unfinished ...> |
Last edited by mike155 on Wed Dec 23, 2020 2:27 pm; edited 1 time in total |
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pietinger
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Posts: 4152
Location: Bavaria
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| Posted: Wed Dec 23, 2020 2:04 pm Post subject: |
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Hmmm ... strange ... I have (stable system):
| Code: | ~ $ vlc --version
VLC media player 3.0.11.1 Vetinari (revision 3.0.11.1-0-g52483f3ca2) |
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