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Fix #95411: "//" temp directory prefix causing crash #118872

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Campbell Barton wants to merge 3 commits from ideasman42:pr-temp-dir-sanitize into main
pull from: ideasman42:pr-temp-dir-sanitize
merge into: blender:main

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Conversation 3 Commits 3 Files Changed 3 +40 -15
Campbell Barton commented 2024-02-28 23:49:10 +01:00
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  • Skip leading forward slashes when setting the temp directory.
  • Add a utility function to set the temporary directory
    which is used for the user preferences & environment variables.

This is an alternative fix to #118856 which ignores these directories.

Since temporary directories may be set via environment variables & "//example/tmp/" is a valid path, I'd suggest to support these paths.

After this PR the following works:

env TMPDIR="//tmp/foo" blender --factory-startup --python-expr "print("Temp:", __import__('bpy').app.tempdir)"

Temp: /tmp/foo/blender_YyTCaH/ is printed.

- Skip leading forward slashes when setting the temp directory. - Add a utility function to set the temporary directory which is used for the user preferences & environment variables. ---- This is an alternative fix to #118856 which ignores these directories. Since temporary directories may be set via environment variables & "//example/tmp/" is a valid path, I'd suggest to support these paths. After this PR the following works: ``` env TMPDIR="//tmp/foo" blender --factory-startup --python-expr "print("Temp:", __import__('bpy').app.tempdir)" ``` `Temp: /tmp/foo/blender_YyTCaH/` is printed.
Campbell Barton requested review from Philipp Oeser 2024-02-28 23:56:37 +01:00
Campbell Barton requested review from Bastien Montagne 2024-02-28 23:56:38 +01:00
Campbell Barton added the
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 label 2024-02-28 23:56:52 +01:00
Campbell Barton force-pushed pr-temp-dir-sanitize from 2697eff0e5 to 0d0d6ea0c2 2024-02-28 23:58:08 +01:00 Compare
Campbell Barton force-pushed pr-temp-dir-sanitize from 0d0d6ea0c2 to 2048825d44 2024-02-29 00:02:57 +01:00 Compare
Campbell Barton force-pushed pr-temp-dir-sanitize from 2048825d44 to 0b3b35683a 2024-02-29 00:26:16 +01:00 Compare
Philipp Oeser commented 2024-02-29 10:35:31 +01:00
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After putting in // for Temporary Files

image

I am still getting a warning (similar to without this patch -- now a single slash)

WARN (bke.appdir): source/blender/blenkernel/intern/appdir.cc:1160 tempdir_session_create: Could not generate a temp file name for '/blender_f0jAHj', falling back to '/'

Collada still crashes.

The output of the following also seems wrong

env TMPDIR="//" ./bin/blender --factory-startup --python-expr "print('Temp:', __import__('bpy').app.tempdir)"
WARN (bke.appdir): source/blender/blenkernel/intern/appdir.cc:1160 tempdir_session_create: Could not generate a temp file name for '/blender_4WKfHw', falling back to '/'
Temp: /

env TMPDIR="//tmp/foo" ./bin/blender --factory-startup --python-expr "print('Temp:', __import__('bpy').app.tempdir)"
Temp: /tmp/blender_ve6XoD/
After putting in `//` for `Temporary Files` ![image](/attachments/4878692b-afa6-4bd5-b791-7538614fb3c0) I am still getting a warning (similar to without this patch -- now a single slash) `WARN (bke.appdir): source/blender/blenkernel/intern/appdir.cc:1160 tempdir_session_create: Could not generate a temp file name for '/blender_f0jAHj', falling back to '/'` Collada still crashes. The output of the following also seems wrong ``` env TMPDIR="//" ./bin/blender --factory-startup --python-expr "print('Temp:', __import__('bpy').app.tempdir)" WARN (bke.appdir): source/blender/blenkernel/intern/appdir.cc:1160 tempdir_session_create: Could not generate a temp file name for '/blender_4WKfHw', falling back to '/' Temp: / ``` ``` env TMPDIR="//tmp/foo" ./bin/blender --factory-startup --python-expr "print('Temp:', __import__('bpy').app.tempdir)" Temp: /tmp/blender_ve6XoD/ ```
image.png
5.1 KiB
Campbell Barton force-pushed pr-temp-dir-sanitize from 0b3b35683a to 958024b7c6 2024-02-29 10:56:24 +01:00 Compare
Campbell Barton commented 2024-02-29 11:00:11 +01:00
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@lichtwerk this patch makes it so //path becomes /path, however // also becomes /.

Entering / on it's own also has this problem, unrelated to relative paths.

I've added a check that the temporary directory is writable, so that means directories without permissions to write will be rejected, although we could consider the issue of "users pointing the temp directory to a path they don't have permissions to write to" separate from paths being interpreted as relative.

Further, Collada crashing without write permissions is suspicious, a file system may fail to write for all sorts of reasons, Blender should report an error that the operation failed - instead of crashing, but that's a separate issue.

@lichtwerk this patch makes it so `//path` becomes `/path`, however `//` also becomes `/`. Entering `/` on it's own also has this problem, unrelated to relative paths. I've added a check that the temporary directory is writable, so that means directories without permissions to write will be rejected, although we could consider the issue of _"users pointing the temp directory to a path they don't have permissions to write to"_ separate from paths being interpreted as relative. ---- Further, Collada crashing without write permissions is suspicious, a file system may fail to write for all sorts of reasons, Blender should report an error that the operation failed - instead of crashing, but that's a separate issue.
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Bastien Montagne reviewed 2024-02-29 11:11:41 +01:00
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From a logical PoV, change LGTM.

Wondering if we should not try to use actual C++ for such new code (although it does add a bit of pain to use it in C-code context...)? And effectively converting the file to C++ one of course.

Something like std::optional<std::string> blender::temp_directory_path_copy_if_valid(blender::StringRefNull dirpath); maybe?

@HooglyBoogly would know better about that though.

From a logical PoV, change LGTM. Wondering if we should not try to use actual C++ for such new code (although it does add a bit of pain to use it in C-code context...)? And effectively converting the file to C++ one of course. Something like `std::optional<std::string> blender::temp_directory_path_copy_if_valid(blender::StringRefNull dirpath);` maybe? @HooglyBoogly would know better about that though.
Campbell Barton added 1 commit 2024-02-29 11:36:21 +01:00
d225044858 Revert "Check the temporary directory is writable before setting" 
This reverts commit 958024b7c6.

I'd rather handle permissions separately from relative paths.
Philipp Oeser approved these changes 2024-02-29 11:46:22 +01:00
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discussed a bit further in chat, accepting (but since Collada will still crash on certain input, will look into separate fix for that...)

discussed a bit further in chat, accepting (but since Collada will still crash on certain input, will look into separate fix for that...)
Campbell Barton commented 2024-02-29 12:05:39 +01:00
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Committed c19cdc343f, closing.

Committed c19cdc343f9a8ffae89146fbf80e6152a340562b, closing.
Campbell Barton closed this pull request 2024-02-29 12:05:43 +01:00

Pull request closed

This pull request cannot be reopened because the branch was deleted.
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