-
-#define SYSCALL 0x050f
-#define NOP2 0x9090
-
-/*
- * NOP out syscall in vsyscall page when not needed.
- */
-static int vsyscall_sysctl_change(ctl_table *ctl, int write, struct file * filp,
- void __user *buffer, size_t *lenp, loff_t *ppos)
-{
- extern u16 vsysc1, vsysc2;
- u16 __iomem *map1;
- u16 __iomem *map2;
- int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
- if (!write)
- return ret;
- /* gcc has some trouble with __va(__pa()), so just do it this
- way. */
- map1 = ioremap(__pa_vsymbol(&vsysc1), 2);
- if (!map1)
- return -ENOMEM;
- map2 = ioremap(__pa_vsymbol(&vsysc2), 2);
- if (!map2) {
- ret = -ENOMEM;
- goto out;
- }
- if (!vsyscall_gtod_data.sysctl_enabled) {
- writew(SYSCALL, map1);
- writew(SYSCALL, map2);
- } else {
- writew(NOP2, map1);
- writew(NOP2, map2);
- }
- iounmap(map2);
-out:
- iounmap(map1);
- return ret;
-}
-
-static int vsyscall_sysctl_nostrat(ctl_table *t, int __user *name, int nlen,
- void __user *oldval, size_t __user *oldlenp,
- void __user *newval, size_t newlen)
-{
- return -ENOSYS;
-}
-