** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Benjamin Wheeler (benjaminwheeler)
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https://bugs.launchpad.net/bugs/2100957
Title:
Noble kernel breaks `modprobe --dump-modversion`
Status in linux package in Ubuntu:
New
Bug description:
The following patch was introduced into Noble's kernel ( which is said
to allow support for arbitrary symbol length in modversion:
https://git.launchpad.net/~ubuntu-
kernel/ubuntu/+source/linux/+git/noble/commit/scripts/mod/modpost.c?id=0a4e704ad1a9800a7d24179c9d14aae6f43c4813
Noble, however, contains kmod v31:
$ modprobe -V
kmod version 31
-ZSTD -XZ -ZLIB -LIBCRYPTO -EXPERIMENTAL
This version of kmod expects that modversion symbol lengths be of size
64. This means that any module compiled on Noble will fail `modprobe
--dump-modversion`.
To reproduce this error, one can build a simple module such as the
following on both Noble and Jammy (which does not contain this bug)
[note: this repo does not contain a `MODULE_LICENSE()` line so add
that to `hello.c` before building]: https://github.com/jmuia/hello-ko
We will call the module built on Noble `hello-noble.ko` and the module
built on Jammy `hello-jammy.ko`.
Noble (6.8.0-54-generic):
$ modprobe --dump-modversion hello-jammy.ko
0x09931d80 module_layout
0x92997ed8 _printk
$ modprobe --dump-modversion hello-noble.ko
modprobe: FATAL: could not get modversions of hello-noble.ko: Invalid argument
Jammy (5.15.0-134-generic):
$ modprobe --dump-modversion hello-jammy.ko
0x09931d80 module_layout
0x92997ed8 _printk
$ modprobe --dump-modversion hello-noble.ko
modprobe: FATAL: could not get modversions of hello-noble.ko: Invalid argument
We expect that the error from `modprobe --dump-modversion hello-
noble.ko` should not happen on either Noble or Jammy.
This bug was discovered by myself and @jmbl while trying to utilize
`kpatch-build` as we experienced different behavior when building on
Jammy and Noble.
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