3 ms·

From the merge commit: +#ifdef CONFIG_PAGE_TABLE_ISOLATION +# define DISABLE_PTI 0 +#else +# define DISABLE_PTI (1 << (X86_FEATURE_PTI & 31)) +#end

• throwaway613834 9y ago
  I meant disable at run time, not disabling via recompiling your own kernel.
  • uniformlyrandom 9y ago
    That is also in there. You can either specify "pti off" or "nopti" as a boot parameter. +void __init pti_check_boottime_disable(void) ... + ret = cmdline_find_option(boot_command_line, "pti", arg, sizeof(arg)); + if (ret > 0) { + if (ret == 3 && !strncmp(arg, "off", 3)) { + pti_print_if_insecure("disabled on command line."); + return; + } + if (ret == 2 && !strncmp(arg, "on", 2)) { + pti_print_if_secure("force enabled on command line."); + goto enable; + } + if (ret == 4 && !strncmp(arg, "auto", 4)) + goto autosel; + } + + if (cmdline_find_option_bool(boot_command_line, "nopti")) { + pti_print_if_insecure("disabled on command line."); + return; + } + +autosel: + if (!boot_cpu_has_bug(X86_BUG_CPU_INSECURE)) + return;