Apache httpd buffering to /tmp without cleanup at the end

During a file upload using an HTML form as "multipart/form-data" httpd service buffer the request body and writes two files to /tmp folder

COMMAND    PID   USER   FD      TYPE             DEVICE  SIZE/OFF      NODE NAME
httpd     31961 user   17u      REG                7,0   7339708      3583 /tmp/20240111-111340-ZZ-xRBZyM-dqClMGsn2_GQAAAAo-file-WCxpBl
httpd     31961 user   20u      REG                7,0   7340032      3585 /tmp/20240111-111343-ZZ-xRBZyM-dqClMGsn2_GQAAAAo-request_body-UhKAPP

Problem 1: When the request is done the second file (-request_body-) is deleted but the first (-file-) not deleted.

problem 2: The /tmp folder not cleanup automatically. Some process accesses the files once a day which prevents them from being deleted by systemd-tmpfiles

$ stat /tmp/20240111-111340-ZZ-xRBZyM-dqClMGsn2_GQAAAAo-file-WCxpBl
  File: ‘/tmp/20240111-111340-ZZ-xRBZyM-dqClMGsn2_GQAAAAo-file-WCxpBl’
  Size: 15728640        Blocks: 30760      IO Block: 4096   regular file
Device: 700h/1792d      Inode: 3583        Links: 1
Access: (0600/-rw-------)  Uid: ( 1006/user)   Gid: ( 1008/user)
Context: system_u:object_r:tmp_t:s0
Access: 2024-01-12 00:05:02.576917366 +0200
Modify: 2024-01-11 11:18:54.623436830 +0200
Change: 2024-01-11 11:18:54.623436830 +0200
 Birth: -

The `systemd-tmpfiles` job return "modify time ... IST is too new."

Does anyone have an idea how to solve these problems?

cPRex Jurassic Moderator

January 12, 2024 19:38

Hey there! This doesn't sound like it would be related to the cPanel tools on the server, so you may get better answers to this question posting in a more general Apache-centric place.

Does this issue only happen with one specific form? If so, I'm wondering if the form itself would be the most likely issue.

Unnamed User

January 14, 2024 15:28

It seems that this is a cPanel problem because apparently it is an incorrect configuration setting that comes with the panel by default.

The problem occurs in every form for example like this

<form method="post" enctype="multipart/form-data">
  <input name="file" type="file" /><br />
  <input type="submit" value="SUbmit" />
</form>

Boariu Alexandru

February 20, 2024 13:01

hi. we're having this exact same issue. it's definitely cpanel-related since it started happening recently without any changes on our side.

today we ran out of space and i had to delete some of those files.

can you investigate?

February 20, 2024 14:10

Boariu Alexandru - it would likely be best to open a ticket on this so we can test this on a system where the issue is happening.

Apache httpd buffering to /tmp without cleanup at the end

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