On Thu, May 07, 2026 at 09:21:15AM -0600, Jonathan Corbet wrote:
Sasha Levin <[email protected]> writes:When a (security) issue goes public, fleets stay exposed until a patched kernel is built, distributed, and rebooted into. For many such issues the simplest mitigation is to stop calling the buggy function. Killswitch provides that. An admin writes: echo "engage af_alg_sendmsg -1" \ > /sys/kernel/security/killswitch/control After this, af_alg_sendmsg() returns -EPERM on every call without running its body. The mitigation takes effect immediately, and is dropped on the next reboot.A quick look suggests that you're not checking lockdown status. I don't doubt for a second that this thing could be used to bypass lockdown - by shorting out security_locked_down() if nothing else. I'm guessing that might not prove entirely popular.
Hmm... Good point. I'll respin a v2 adressing this and Greg's comments. -- Thanks, Sasha
