Modules that do not use any of the init.h or module.h macros to generate
init_module / cleanup_module symbols:
# objdump -x /lib/modules/5.19.0-9-generic/updates/dkms/v4l2loopback.ko | grep
-e init_module -e cleanup_module
0000000000000000 g F .exit.text 000000000000004d cleanup_module
0000000000000000 g F .init.text 0000000000000979 init_module
0000000000000138 R_X86_64_64 init_module
0000000000000338 R_X86_64_64 cleanup_module
Modules that do use any of the init.h or module.h macros to generate
init_module / cleanup_module symbols:
# objdump -x /lib/modules/5.19.0-9-generic/updates/dkms/v4l2loopback.ko | grep
-e init_module -e cleanup_module
0000000000000810 l F .text 0000000000000030 v4l2loopback_cleanup_module
0000000000000149 l F .text.unlikely 0000000000000035
v4l2loopback_cleanup_module.cold
0000000000000000 l F .init.text 0000000000000979
v4l2loopback_init_module
0000000000000810 g F .text 0000000000000030 cleanup_module
0000000000000000 g O .exit.data 0000000000000008 __cfi_jt_cleanup_module
0000000000000000 g F .init.text 0000000000000979 init_module
0000000000000000 g O .init.data 0000000000000008 __cfi_jt_init_module
0000000000000000 R_X86_64_64 cleanup_module
0000000000000000 R_X86_64_64 init_module
0000000000000138 R_X86_64_64 init_module
0000000000000338 R_X86_64_64 cleanup_module
Specifically addition of __cfi_jt_init_module & __cfi_jt_cleanup_module
is important for correctly functioning Control Flow Integrity, aka on
intel IBT.
The fix is to use macros from init.h / module.h to declare entry and
exit functions of the module.
** Also affects: v4l2loopback (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1980484
Title:
temporarily disable CONFIG_X86_KERNEL_IBT
Status in backport-iwlwifi-dkms package in Ubuntu:
Confirmed
Status in linux package in Ubuntu:
Incomplete
Status in v4l2loopback package in Ubuntu:
Confirmed
Status in backport-iwlwifi-dkms source package in Kinetic:
Confirmed
Status in linux source package in Kinetic:
Incomplete
Status in v4l2loopback source package in Kinetic:
Confirmed
Bug description:
Enabling IBT in the kernel is going to be problematic at the moment,
because dkms' that have a precompiled binary need to be linked against
non-IBT kernels and IBT kernels (see nvidia drivers for example).
For this reason it's safer to keep IBT disabled at the moment, until
all the kernels will have IBT enabled and the kernel modules /
binaries will use the proper flags to generate IBT-compliant binaries.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/backport-iwlwifi-dkms/+bug/1980484/+subscriptions
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