forked from luck/tmp_suning_uos_patched
70 lines
1.2 KiB
C
70 lines
1.2 KiB
C
|
#include <linux/spinlock.h>
|
||
|
|
#include <linux/errno.h>
|
||
|
|
#include <linux/init.h>
|
||
|
|
|
||
|
|
#include <asm/pgtable.h>
|
||
|
|
|
||
|
|
int nx_enabled;
|
||
|
|
|
||
|
|
#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
|
||
|
|
static int disable_nx __cpuinitdata;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* noexec = on|off
|
||
|
|
*
|
||
|
|
* Control non-executable mappings for processes.
|
||
|
|
*
|
||
|
|
* on Enable
|
||
|
|
* off Disable
|
||
|
|
*/
|
||
|
|
static int __init noexec_setup(char *str)
|
||
|
|
{
|
||
|
|
if (!str)
|
||
|
|
return -EINVAL;
|
||
|
|
if (!strncmp(str, "on", 2)) {
|
||
|
|
__supported_pte_mask |= _PAGE_NX;
|
||
|
|
disable_nx = 0;
|
||
|
|
} else if (!strncmp(str, "off", 3)) {
|
||
|
|
disable_nx = 1;
|
||
|
|
__supported_pte_mask &= ~_PAGE_NX;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
early_param("noexec", noexec_setup);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef CONFIG_X86_PAE
|
||
|
|
void __init set_nx(void)
|
||
|
|
{
|
||
|
|
unsigned int v[4], l, h;
|
||
|
|
|
||
|
|
if (cpu_has_pae && (cpuid_eax(0x80000000) > 0x80000001)) {
|
||
|
|
cpuid(0x80000001, &v[0], &v[1], &v[2], &v[3]);
|
||
|
|
|
||
|
|
if ((v[3] & (1 << 20)) && !disable_nx) {
|
||
|
|
rdmsr(MSR_EFER, l, h);
|
||
|
|
l |= EFER_NX;
|
||
|
|
wrmsr(MSR_EFER, l, h);
|
||
|
|
nx_enabled = 1;
|
||
|
|
__supported_pte_mask |= _PAGE_NX;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
#else
|
||
|
|
void set_nx(void)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef CONFIG_X86_64
|
||
|
|
void __cpuinit check_efer(void)
|
||
|
|
{
|
||
|
|
unsigned long efer;
|
||
|
|
|
||
|
|
rdmsrl(MSR_EFER, efer);
|
||
|
|
if (!(efer & EFER_NX) || disable_nx)
|
||
|
|
__supported_pte_mask &= ~_PAGE_NX;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|