Public bug reported:
The source code below is a absolute minimal kernel driver for Ubuntu 24.05.LTS
kernel 6.7.0.
Using insmod and rmmod you can successfully load\unload the driver, e.g.
sudo insmod ch34x_pis.ko
However.... if you change the unused function name to read
"ch34x_fops_read(void)"
insmod fails with the following error --->
insmod: ERROR: could not insert module ch34x_pis.ko: Invalid parameters
and in dmesg log --->
[12287.351993] BPF: [123685] FUNC 34x_fops_read
[12287.352001] BPF: type_id=1249
[12287.352002] BPF:
[12287.352004] BPF: Invalid name
[12287.352005] BPF:
[12287.352007] failed to validate module [ch34x_pis] BTF: -22
NOTE - the BPF error message says "34x_fops_read" ... and not the actual name
of "ch34x_fops_read".
Source code (compiled using kernel 6.7.0) ---->
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/usb.h>
int XXXch34x_fops_read(void)
{
return 0;
}
const struct usb_device_id table[] =
{
{ }
};
MODULE_DEVICE_TABLE(usb, table);
static struct usb_driver duff_driver =
{
.name = "DUFF",
.id_table = table,
};
module_usb_driver(duff_driver);
MODULE_LICENSE("GPL");
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2115120
Title:
insmod fail due to function name starting with ch
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