Commit 4b0f3b81 authored by Kees Cook's avatar Kees Cook Committed by H. Peter Anvin
Browse files

x86, mm: Report state of NX protections during boot 



It is possible for x86_64 systems to lack the NX bit either due to the
hardware lacking support or the BIOS having turned off the CPU capability,
so NX status should be reported.  Additionally, anyone booting NX-capable
CPUs in 32bit mode without PAE will lack NX functionality, so this change
provides feedback for that case as well.

Signed-off-by: default avatarKees Cook <kees.cook@canonical.com>
Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
LKML-Reference: <1258154897-6770-6-git-send-email-hpa@zytor.com>
parent 4763ed4d

arch/x86/include/asm/proto.h

+1 −0
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ extern void ia32_sysenter_target(void); 
extern void syscall32_cpu_init(void);



extern void x86_configure_nx(void);

extern void x86_report_nx(void);



extern int reboot_force;

arch/x86/kernel/setup.c

+6 −5
Original line number Diff line number Diff line
@@ -788,16 +788,17 @@ void __init setup_arch(char **cmdline_p) 
	*cmdline_p = command_line;



	/*

	 * Must call this twice: Once just to detect whether hardware doesn't

	 * support NX (so that the early EHCI debug console setup can safely

	 * call set_fixmap(), and then again after parsing early parameters to

	 * honor the respective command line option.

	 * x86_configure_nx() is called before parse_early_param() to detect

	 * whether hardware doesn't support NX (so that the early EHCI debug

	 * console setup can safely call set_fixmap()). It may then be called

	 * again from within noexec_setup() during parsing early parameters

	 * to honor the respective command line option.

	 */

	x86_configure_nx();



	parse_early_param();



	x86_configure_nx();

	x86_report_nx();



	/* Must be before kernel pagetables are setup */

	vmi_activate();

arch/x86/mm/init.c

+0 −4
Original line number Diff line number Diff line
@@ -146,10 +146,6 @@ unsigned long __init_refok init_memory_mapping(unsigned long start, 
	use_gbpages = direct_gbpages;

#endif



	/* XXX: replace this with Kees' improved messages */

	if (__supported_pte_mask & _PAGE_NX)

		printk(KERN_INFO "NX (Execute Disable) protection: active\n");



	/* Enable PSE if available */

	if (cpu_has_pse)

		set_in_cr4(X86_CR4_PSE);

arch/x86/mm/setup_nx.c

+22 −0
Original line number Diff line number Diff line
@@ -36,3 +36,25 @@ void __cpuinit x86_configure_nx(void) 
	else

		__supported_pte_mask &= ~_PAGE_NX;

}



void __init x86_report_nx(void)

{

	if (!cpu_has_nx) {

		printk(KERN_NOTICE "Notice: NX (Execute Disable) protection "

		       "missing in CPU or disabled in BIOS!\n");

	} else {

#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)

		if (disable_nx) {

			printk(KERN_INFO "NX (Execute Disable) protection: "

			       "disabled by kernel command line option\n");

		} else {

			printk(KERN_INFO "NX (Execute Disable) protection: "

			       "active\n");

		}

#else

		/* 32bit non-PAE kernel, NX cannot be used */

		printk(KERN_NOTICE "Notice: NX (Execute Disable) protection "

		       "cannot be enabled: non-PAE kernel!\n");

#endif

	}

}

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