On 7/19/23 11:21, Petr Mladek wrote: > On Fri 2023-06-23 18:55:29, Brian Gerst wrote: >> When kCFI is enabled, special handling is needed for the indirect call >> to the kernel thread function. Rewrite the ret_from_fork() function in >> C so that the compiler can properly handle the indirect call. > > This patch broke livepatching. Kthreads never have a reliable stack. > It works when I revert it. > Just curious -- did the selftests catch this anywhere? I'm not 100% clear on what trees / frequency they all run, so maybe Petr you found this by code inspection or other means? -- Joe
