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Differential D25273 Diff 76104 sys/amd64/amd64/vm_machdep.c

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sys/amd64/amd64/vm_machdep.c

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cpu_exec_vmspace_reuse(struct proc *p, vm_map_t map) cpu_exec_vmspace_reuse(struct proc *p, vm_map_t map)
{ {
return (((curproc->p_md.md_flags & P_MD_KPTI) != 0) == return (((curproc->p_md.md_flags & P_MD_KPTI) != 0) ==
(vm_map_pmap(map)->pm_ucr3 != PMAP_NO_CR3)); (vm_map_pmap(map)->pm_ucr3 != PMAP_NO_CR3));
} }
static void static void
cpu_procctl_kpti(struct proc *p, int com, int *val) cpu_procctl_kpti_ctl(struct proc *p, int val)
{ {
if (com == PROC_KPTI_CTL) { if (pti && val == PROC_KPTI_CTL_ENABLE_ON_EXEC)
if (pti && *val == PROC_KPTI_CTL_ENABLE_ON_EXEC)
p->p_md.md_flags |= P_MD_KPTI; p->p_md.md_flags |= P_MD_KPTI;
if (*val == PROC_KPTI_CTL_DISABLE_ON_EXEC) if (val == PROC_KPTI_CTL_DISABLE_ON_EXEC)
p->p_md.md_flags &= ~P_MD_KPTI; p->p_md.md_flags &= ~P_MD_KPTI;
} else /* PROC_KPTI_STATUS */ { }
static void
cpu_procctl_kpti_status(struct proc *p, int *val)
{
*val = (p->p_md.md_flags & P_MD_KPTI) != 0 ? *val = (p->p_md.md_flags & P_MD_KPTI) != 0 ?
PROC_KPTI_CTL_ENABLE_ON_EXEC: PROC_KPTI_CTL_ENABLE_ON_EXEC:
PROC_KPTI_CTL_DISABLE_ON_EXEC; PROC_KPTI_CTL_DISABLE_ON_EXEC;
if (vmspace_pmap(p->p_vmspace)->pm_ucr3 != PMAP_NO_CR3) if (vmspace_pmap(p->p_vmspace)->pm_ucr3 != PMAP_NO_CR3)
*val |= PROC_KPTI_STATUS_ACTIVE; *val |= PROC_KPTI_STATUS_ACTIVE;
} }
static int
cpu_procctl_la_ctl(struct proc *p, int val)
{
int error;
error = 0;
switch (val) {
case PROC_LA_CTL_LA48_ON_EXEC:
p->p_md.md_flags |= P_MD_LA48;
p->p_md.md_flags &= ~P_MD_LA57;
break;
case PROC_LA_CTL_LA57_ON_EXEC:
if (la57) {
p->p_md.md_flags &= ~P_MD_LA48;
p->p_md.md_flags |= P_MD_LA57;
} else {
error = ENOTSUP;
} }
break;
case PROC_LA_CTL_DEFAULT_ON_EXEC:
p->p_md.md_flags &= ~(P_MD_LA48 | P_MD_LA57);
break;
}
return (error);
}
static void
cpu_procctl_la_status(struct proc *p, int *val)
{
int res;
if ((p->p_md.md_flags & P_MD_LA48) != 0)
res = PROC_LA_CTL_LA48_ON_EXEC;
else if ((p->p_md.md_flags & P_MD_LA57) != 0)
res = PROC_LA_CTL_LA57_ON_EXEC;
else
res = PROC_LA_CTL_DEFAULT_ON_EXEC;
if (p->p_sysent->sv_maxuser == VM_MAXUSER_ADDRESS_LA48)
res |= PROC_LA_STATUS_LA48;
else
res |= PROC_LA_STATUS_LA57;
*val = res;
}
int int
cpu_procctl(struct thread *td, int idtype, id_t id, int com, void *data) cpu_procctl(struct thread *td, int idtype, id_t id, int com, void *data)
{ {
struct proc *p; struct proc *p;
int error, val; int error, val;
switch (com) { switch (com) {
case PROC_KPTI_CTL: case PROC_KPTI_CTL:
case PROC_KPTI_STATUS: case PROC_KPTI_STATUS:
case PROC_LA_CTL:
case PROC_LA_STATUS:
if (idtype != P_PID) { if (idtype != P_PID) {
error = EINVAL; error = EINVAL;
break; break;
} }
if (com == PROC_KPTI_CTL) { if (com == PROC_KPTI_CTL) {
/* sad but true and not a joke */ /* sad but true and not a joke */
error = priv_check(td, PRIV_IO); error = priv_check(td, PRIV_IO);
if (error != 0) if (error != 0)
break; break;
}
if (com == PROC_KPTI_CTL || com == PROC_LA_CTL) {
error = copyin(data, &val, sizeof(val)); error = copyin(data, &val, sizeof(val));
if (error != 0) if (error != 0)
break; break;
if (val != PROC_KPTI_CTL_ENABLE_ON_EXEC && }
if (com == PROC_KPTI_CTL &&
val != PROC_KPTI_CTL_ENABLE_ON_EXEC &&
val != PROC_KPTI_CTL_DISABLE_ON_EXEC) { val != PROC_KPTI_CTL_DISABLE_ON_EXEC) {
error = EINVAL; error = EINVAL;
break; break;
} }
if (com == PROC_LA_CTL &&
val != PROC_LA_CTL_LA48_ON_EXEC &&
val != PROC_LA_CTL_LA57_ON_EXEC &&
val != PROC_LA_CTL_DEFAULT_ON_EXEC) {
error = EINVAL;
break;
} }
error = pget(id, PGET_CANSEE | PGET_NOTWEXIT | PGET_NOTID, &p); error = pget(id, PGET_CANSEE | PGET_NOTWEXIT | PGET_NOTID, &p);
if (error == 0) { if (error != 0)
cpu_procctl_kpti(p, com, &val); break;
switch (com) {
case PROC_KPTI_CTL:
cpu_procctl_kpti_ctl(p, val);
break;
case PROC_KPTI_STATUS:
cpu_procctl_kpti_status(p, &val);
break;
case PROC_LA_CTL:
error = cpu_procctl_la_ctl(p, val);
break;
case PROC_LA_STATUS:
cpu_procctl_la_status(p, &val);
break;
}
PROC_UNLOCK(p); PROC_UNLOCK(p);
if (com == PROC_KPTI_STATUS) if (com == PROC_KPTI_STATUS || com == PROC_LA_STATUS)
error = copyout(&val, data, sizeof(val)); error = copyout(&val, data, sizeof(val));
}
break; break;
default: default:
error = EINVAL; error = EINVAL;
break; break;
} }
return (error); return (error);
} }
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