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Diffstat (limited to 'arch/x86/mm/pti.c')
-rw-r--r--arch/x86/mm/pti.c58
1 files changed, 29 insertions, 29 deletions
diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c
index 78414c6d1b..5dd7339446 100644
--- a/arch/x86/mm/pti.c
+++ b/arch/x86/mm/pti.c
@@ -69,6 +69,7 @@ static void __init pti_print_if_secure(const char *reason)
pr_info("%s\n", reason);
}
+/* Assume mode is auto unless overridden via cmdline below. */
static enum pti_mode {
PTI_AUTO = 0,
PTI_FORCE_OFF,
@@ -77,50 +78,49 @@ static enum pti_mode {
void __init pti_check_boottime_disable(void)
{
- char arg[5];
- int ret;
-
- /* Assume mode is auto unless overridden. */
- pti_mode = PTI_AUTO;
-
if (hypervisor_is_type(X86_HYPER_XEN_PV)) {
pti_mode = PTI_FORCE_OFF;
pti_print_if_insecure("disabled on XEN PV.");
return;
}
- ret = cmdline_find_option(boot_command_line, "pti", arg, sizeof(arg));
- if (ret > 0) {
- if (ret == 3 && !strncmp(arg, "off", 3)) {
- pti_mode = PTI_FORCE_OFF;
- pti_print_if_insecure("disabled on command line.");
- return;
- }
- if (ret == 2 && !strncmp(arg, "on", 2)) {
- pti_mode = PTI_FORCE_ON;
- pti_print_if_secure("force enabled on command line.");
- goto enable;
- }
- if (ret == 4 && !strncmp(arg, "auto", 4)) {
- pti_mode = PTI_AUTO;
- goto autosel;
- }
- }
-
- if (cmdline_find_option_bool(boot_command_line, "nopti") ||
- cpu_mitigations_off()) {
+ if (cpu_mitigations_off())
pti_mode = PTI_FORCE_OFF;
+ if (pti_mode == PTI_FORCE_OFF) {
pti_print_if_insecure("disabled on command line.");
return;
}
-autosel:
- if (!boot_cpu_has_bug(X86_BUG_CPU_MELTDOWN))
+ if (pti_mode == PTI_FORCE_ON)
+ pti_print_if_secure("force enabled on command line.");
+
+ if (pti_mode == PTI_AUTO && !boot_cpu_has_bug(X86_BUG_CPU_MELTDOWN))
return;
-enable:
+
setup_force_cpu_cap(X86_FEATURE_PTI);
}
+static int __init pti_parse_cmdline(char *arg)
+{
+ if (!strcmp(arg, "off"))
+ pti_mode = PTI_FORCE_OFF;
+ else if (!strcmp(arg, "on"))
+ pti_mode = PTI_FORCE_ON;
+ else if (!strcmp(arg, "auto"))
+ pti_mode = PTI_AUTO;
+ else
+ return -EINVAL;
+ return 0;
+}
+early_param("pti", pti_parse_cmdline);
+
+static int __init pti_parse_cmdline_nopti(char *arg)
+{
+ pti_mode = PTI_FORCE_OFF;
+ return 0;
+}
+early_param("nopti", pti_parse_cmdline_nopti);
+
pgd_t __pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd)
{
/*