[Bug 14041] New: using modprobe/insmod with compressed modules gives scary kernel warnings

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=14041

            Bug ID: 14041
           Summary: using modprobe/insmod with compressed modules gives
                    scary kernel warnings
           Product: Busybox
           Version: 1.33.x
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at busybox.net
          Reporter: nolange79 at gmail.com
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

I am using kernel 5.4 on x86_64 fro an embedded system.

loading a compressed module will give the kernel log error:
kernel: Module has invalid ELF structures

steps to reproduce are simply:
# busybox insmod nbd.ko.gz

Some points:

this happens with gzip and xz

the util-linux insmod/modprobe work without log entry

the module seems correctly loaded and works.

decompressing the module (with the same busybox executable) and then loading it
will lead to no log entry

# (after unloading the module again)
# busybox gzip -d nbd.ko.gz
# busybox insmod nbd.ko


I dont know if there is any functional issue, but I am tempted to raise
severity since I cant rule it out either.

--- Comment #1 from sylvain.prat at gmail.com ---
I also fell into the problem. I was wondering how alpine linux worked out with
compressed linux modules and I finally found out that they don't use busybox's
modprobe anymore... Since the decompression methods already exist in busybox,
it shouldn't be too hard to implement I guess, but I'm not competent enough to
do it myself.

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