1 #include <linux/spinlock.h>
2 #include <linux/errno.h>
3 #include <linux/init.h>
5 #include <asm/pgtable.h>
7 #include <asm/cpufeature.h>
14 * Control non-executable mappings for processes.
19 static int __init noexec_setup(char *str)
23 if (!strncmp(str, "on", 2)) {
25 } else if (!strncmp(str, "off", 3)) {
31 early_param("noexec", noexec_setup);
33 void x86_configure_nx(void)
35 /* If disable_nx is set, clear NX on all new mappings going forward. */
37 __supported_pte_mask &= ~_PAGE_NX;
40 void __init x86_report_nx(void)
42 if (!boot_cpu_has(X86_FEATURE_NX)) {
43 printk(KERN_NOTICE "Notice: NX (Execute Disable) protection "
46 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
48 printk(KERN_INFO "NX (Execute Disable) protection: "
49 "disabled by kernel command line option\n");
51 printk(KERN_INFO "NX (Execute Disable) protection: "
55 /* 32bit non-PAE kernel, NX cannot be used */
56 printk(KERN_NOTICE "Notice: NX (Execute Disable) protection "
57 "cannot be enabled: non-PAE kernel!\n");