#include <sys/param.h>
#include <sys/buf.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/malloc.h>
#include <sys/proc_internal.h>
#include <sys/kauth.h>
#include <sys/systm.h>
#include <sys/sysproto.h>
#include <security/audit/audit.h>
lck_grp_t * sysctl_lock_group = NULL;
lck_rw_t * sysctl_geometry_lock = NULL;
lck_mtx_t * sysctl_unlocked_node_lock = NULL;
#ifdef STATIC
#undef STATIC
#endif
#if 0
#define STATIC
#else
#define STATIC static
#endif
STATIC void sysctl_sysctl_debug_dump_node(struct sysctl_oid_list *l, int i);
STATIC int sysctl_sysctl_debug(struct sysctl_oid *oidp, void *arg1,
int arg2, struct sysctl_req *req);
STATIC int sysctl_sysctl_name(struct sysctl_oid *oidp, void *arg1,
int arg2, struct sysctl_req *req);
STATIC int sysctl_sysctl_next_ls (struct sysctl_oid_list *lsp,
int *name, u_int namelen, int *next, int *len, int level,
struct sysctl_oid **oidpp);
STATIC int sysctl_old_kernel(struct sysctl_req *req, const void *p, size_t l);
STATIC int sysctl_new_kernel(struct sysctl_req *req, void *p, size_t l);
STATIC int name2oid (char *name, int *oid, u_int *len);
STATIC int sysctl_sysctl_name2oid(struct sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req);
STATIC int sysctl_sysctl_next(struct sysctl_oid *oidp, void *arg1, int arg2,
struct sysctl_req *req);
STATIC int sysctl_sysctl_oidfmt(struct sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req);
STATIC int sysctl_old_user(struct sysctl_req *req, const void *p, size_t l);
STATIC int sysctl_new_user(struct sysctl_req *req, void *p, size_t l);
STATIC void sysctl_create_user_req(struct sysctl_req *req, struct proc *p, user_addr_t oldp,
size_t oldlen, user_addr_t newp, size_t newlen);
STATIC int sysctl_root(boolean_t from_kernel, boolean_t string_is_canonical, char *namestring, size_t namestringlen, int *name, u_int namelen, struct sysctl_req *req);
int kernel_sysctl(struct proc *p, int *name, u_int namelen, void *old, size_t *oldlenp, void *new, size_t newlen);
int kernel_sysctlbyname(const char *name, void *oldp, size_t *oldlenp, void *newp, size_t newlen);
int userland_sysctl(boolean_t string_is_canonical,
char *namestring, size_t namestringlen,
int *name, u_int namelen, struct sysctl_req *req,
size_t *retval);
struct sysctl_oid_list sysctl__children;
void
sysctl_register_oid(struct sysctl_oid *new_oidp)
{
struct sysctl_oid *oidp = NULL;
struct sysctl_oid_list *parent = new_oidp->oid_parent;
struct sysctl_oid *p;
struct sysctl_oid *q;
int n;
if (!(new_oidp->oid_kind & CTLFLAG_OID2)) {
MALLOC(oidp, struct sysctl_oid *, sizeof(*oidp), M_TEMP, M_WAITOK | M_ZERO);
if (oidp == NULL)
return;
memcpy(oidp, new_oidp, offsetof(struct sysctl_oid, oid_descr));
} else {
switch (new_oidp->oid_version) {
case SYSCTL_OID_VERSION:
oidp = new_oidp;
break;
default:
return;
}
}
if(sysctl_geometry_lock == NULL)
{
sysctl_lock_group = lck_grp_alloc_init("sysctl", NULL);
sysctl_geometry_lock = lck_rw_alloc_init(sysctl_lock_group, NULL);
sysctl_unlocked_node_lock = lck_mtx_alloc_init(sysctl_lock_group, NULL);
}
lck_rw_lock_exclusive(sysctl_geometry_lock);
if (oidp->oid_number == OID_AUTO) {
n = OID_AUTO_START;
SLIST_FOREACH(p, parent, oid_link) {
if (p->oid_number > n)
n = p->oid_number;
}
oidp->oid_number = n + 1;
if (oidp != new_oidp)
new_oidp->oid_number = oidp->oid_number;
}
q = NULL;
SLIST_FOREACH(p, parent, oid_link) {
if (oidp->oid_number < p->oid_number)
break;
q = p;
}
if (q)
SLIST_INSERT_AFTER(q, oidp, oid_link);
else
SLIST_INSERT_HEAD(parent, oidp, oid_link);
lck_rw_unlock_exclusive(sysctl_geometry_lock);
}
void
sysctl_unregister_oid(struct sysctl_oid *oidp)
{
struct sysctl_oid *removed_oidp = NULL;
struct sysctl_oid *old_oidp = NULL;
lck_rw_lock_exclusive(sysctl_geometry_lock);
if (!(oidp->oid_kind & CTLFLAG_OID2)) {
SLIST_FOREACH(old_oidp, oidp->oid_parent, oid_link) {
if (!memcmp(&oidp->oid_number, &old_oidp->oid_number, (offsetof(struct sysctl_oid, oid_descr)-offsetof(struct sysctl_oid, oid_number)))) {
break;
}
}
if (old_oidp != NULL) {
SLIST_REMOVE(old_oidp->oid_parent, old_oidp, sysctl_oid, oid_link);
removed_oidp = old_oidp;
}
} else {
switch (oidp->oid_version) {
case SYSCTL_OID_VERSION:
SLIST_REMOVE(oidp->oid_parent, oidp, sysctl_oid, oid_link);
removed_oidp = oidp;
break;
default:
break;
}
}
while(removed_oidp && removed_oidp->oid_refcnt) {
lck_rw_sleep(sysctl_geometry_lock, LCK_SLEEP_EXCLUSIVE, &removed_oidp->oid_refcnt, THREAD_UNINT);
}
lck_rw_unlock_exclusive(sysctl_geometry_lock);
if (old_oidp != NULL) {
FREE(old_oidp, M_TEMP);
}
}
void
sysctl_register_set(const char *set)
{
struct sysctl_oid **oidpp, *oidp;
LINKER_SET_FOREACH(oidpp, struct sysctl_oid **, set) {
oidp = *oidpp;
if (!(oidp->oid_kind & CTLFLAG_NOAUTO)) {
sysctl_register_oid(oidp);
}
}
}
void
sysctl_unregister_set(const char *set)
{
struct sysctl_oid **oidpp, *oidp;
LINKER_SET_FOREACH(oidpp, struct sysctl_oid **, set) {
oidp = *oidpp;
if (!(oidp->oid_kind & CTLFLAG_NOAUTO)) {
sysctl_unregister_oid(oidp);
}
}
}
void
sysctl_register_all()
{
sysctl_register_set("__sysctl_set");
}
void
sysctl_register_fixed(void)
{
sysctl_register_all();
}
int
sysctl_io_number(struct sysctl_req *req, long long bigValue, size_t valueSize, void *pValue, int *changed) {
int smallValue;
int error;
if (changed) *changed = 0;
if (((valueSize == sizeof(int)) ||
((req->oldlen == sizeof(int)) && (valueSize == sizeof(long long))))
&& (req->oldptr)) {
smallValue = (int)bigValue;
if ((long long)smallValue != bigValue)
return(ERANGE);
error = SYSCTL_OUT(req, &smallValue, sizeof(smallValue));
} else {
error = SYSCTL_OUT(req, &bigValue, valueSize);
}
if (error || !req->newptr)
return(error);
if (pValue == NULL)
return(EPERM);
if ((req->newlen == sizeof(int)) && (valueSize == sizeof(long long))) {
error = SYSCTL_IN(req, &smallValue, sizeof(smallValue));
if (!error)
*(long long *)pValue = (long long)smallValue;
} else if ((req->newlen == sizeof(long long)) && (valueSize == sizeof(int))) {
error = SYSCTL_IN(req, &bigValue, sizeof(bigValue));
if (!error) {
smallValue = (int)bigValue;
if ((long long)smallValue != bigValue)
return(ERANGE);
*(int *)pValue = smallValue;
}
} else {
error = SYSCTL_IN(req, pValue, valueSize);
}
if (!error && changed)
*changed = 1;
return(error);
}
int
sysctl_io_string(struct sysctl_req *req, char *pValue, size_t valueSize, int trunc, int *changed)
{
int error;
if (changed) *changed = 0;
if (trunc && req->oldptr && req->oldlen && (req->oldlen<strlen(pValue) + 1)) {
error = SYSCTL_OUT(req, pValue, req->oldlen-1);
if (!error) {
char c = 0;
error = SYSCTL_OUT(req, &c, 1);
}
} else {
error = SYSCTL_OUT(req, pValue, strlen(pValue) + 1);
}
if (error || !req->newptr)
return(error);
if (valueSize == 0)
return(EPERM);
if (req->newlen >= valueSize)
return(EINVAL);
error = SYSCTL_IN(req, pValue, req->newlen);
pValue[req->newlen] = '\0';
if (!error && changed)
*changed = 1;
return(error);
}
int sysctl_io_opaque(struct sysctl_req *req,void *pValue, size_t valueSize, int *changed)
{
int error;
if (changed) *changed = 0;
error = SYSCTL_OUT(req, pValue, valueSize);
if (error || !req->newptr)
return(error);
error = SYSCTL_IN(req, pValue, valueSize);
if (!error && changed)
*changed = 1;
return(error);
}
STATIC void
sysctl_sysctl_debug_dump_node(struct sysctl_oid_list *l, int i)
{
int k;
struct sysctl_oid *oidp;
SLIST_FOREACH(oidp, l, oid_link) {
for (k=0; k<i; k++)
printf(" ");
printf("%d %s ", oidp->oid_number, oidp->oid_name);
printf("%c%c%c",
oidp->oid_kind & CTLFLAG_LOCKED ? 'L':' ',
oidp->oid_kind & CTLFLAG_RD ? 'R':' ',
oidp->oid_kind & CTLFLAG_WR ? 'W':' ');
if (oidp->oid_handler)
printf(" *Handler");
switch (oidp->oid_kind & CTLTYPE) {
case CTLTYPE_NODE:
printf(" Node\n");
if (!oidp->oid_handler) {
sysctl_sysctl_debug_dump_node(
oidp->oid_arg1, i+2);
}
break;
case CTLTYPE_INT: printf(" Int\n"); break;
case CTLTYPE_STRING: printf(" String\n"); break;
case CTLTYPE_QUAD: printf(" Quad\n"); break;
case CTLTYPE_OPAQUE: printf(" Opaque/struct\n"); break;
default: printf("\n");
}
}
}
STATIC int
sysctl_sysctl_debug(__unused struct sysctl_oid *oidp, __unused void *arg1,
__unused int arg2, __unused struct sysctl_req *req)
{
lck_rw_lock_shared(sysctl_geometry_lock);
sysctl_sysctl_debug_dump_node(&sysctl__children, 0);
lck_rw_done(sysctl_geometry_lock);
return ENOENT;
}
SYSCTL_PROC(_sysctl, 0, debug, CTLTYPE_STRING|CTLFLAG_RD | CTLFLAG_LOCKED,
0, 0, sysctl_sysctl_debug, "-", "");
STATIC int
sysctl_sysctl_name(__unused struct sysctl_oid *oidp, void *arg1, int arg2,
struct sysctl_req *req)
{
int *name = (int *) arg1;
u_int namelen = arg2;
int error = 0;
struct sysctl_oid *oid;
struct sysctl_oid_list *lsp = &sysctl__children, *lsp2;
char tempbuf[10];
lck_rw_lock_shared(sysctl_geometry_lock);
while (namelen) {
if (!lsp) {
snprintf(tempbuf,sizeof(tempbuf),"%d",*name);
if (req->oldidx)
error = SYSCTL_OUT(req, ".", 1);
if (!error)
error = SYSCTL_OUT(req, tempbuf, strlen(tempbuf));
if (error) {
lck_rw_done(sysctl_geometry_lock);
return (error);
}
namelen--;
name++;
continue;
}
lsp2 = 0;
SLIST_FOREACH(oid, lsp, oid_link) {
if (oid->oid_number != *name)
continue;
if (req->oldidx)
error = SYSCTL_OUT(req, ".", 1);
if (!error)
error = SYSCTL_OUT(req, oid->oid_name,
strlen(oid->oid_name));
if (error) {
lck_rw_done(sysctl_geometry_lock);
return (error);
}
namelen--;
name++;
if ((oid->oid_kind & CTLTYPE) != CTLTYPE_NODE)
break;
if (oid->oid_handler)
break;
lsp2 = (struct sysctl_oid_list *)oid->oid_arg1;
break;
}
lsp = lsp2;
}
lck_rw_done(sysctl_geometry_lock);
return (SYSCTL_OUT(req, "", 1));
}
SYSCTL_NODE(_sysctl, 1, name, CTLFLAG_RD | CTLFLAG_LOCKED, sysctl_sysctl_name, "");
STATIC int
sysctl_sysctl_next_ls (struct sysctl_oid_list *lsp, int *name, u_int namelen,
int *next, int *len, int level, struct sysctl_oid **oidpp)
{
struct sysctl_oid *oidp;
*len = level;
SLIST_FOREACH(oidp, lsp, oid_link) {
*next = oidp->oid_number;
*oidpp = oidp;
if (!namelen) {
if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
return 0;
if (oidp->oid_handler)
return 0;
lsp = (struct sysctl_oid_list *)oidp->oid_arg1;
if (!SLIST_FIRST(lsp))
continue;
if (!sysctl_sysctl_next_ls (lsp, 0, 0, next+1,
len, level+1, oidpp))
return 0;
goto next;
}
if (oidp->oid_number < *name)
continue;
if (oidp->oid_number > *name) {
if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
return 0;
if (oidp->oid_handler)
return 0;
lsp = (struct sysctl_oid_list *)oidp->oid_arg1;
if (!sysctl_sysctl_next_ls (lsp, name+1, namelen-1,
next+1, len, level+1, oidpp))
return (0);
goto next;
}
if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
continue;
if (oidp->oid_handler)
continue;
lsp = (struct sysctl_oid_list *)oidp->oid_arg1;
if (!sysctl_sysctl_next_ls (lsp, name+1, namelen-1, next+1,
len, level+1, oidpp))
return (0);
next:
namelen = 1;
*len = level;
}
return 1;
}
STATIC int
sysctl_sysctl_next(__unused struct sysctl_oid *oidp, void *arg1, int arg2,
struct sysctl_req *req)
{
int *name = (int *) arg1;
u_int namelen = arg2;
int i, j, error;
struct sysctl_oid *oid;
struct sysctl_oid_list *lsp = &sysctl__children;
int newoid[CTL_MAXNAME];
lck_rw_lock_shared(sysctl_geometry_lock);
i = sysctl_sysctl_next_ls (lsp, name, namelen, newoid, &j, 1, &oid);
lck_rw_done(sysctl_geometry_lock);
if (i)
return ENOENT;
error = SYSCTL_OUT(req, newoid, j * sizeof (int));
return (error);
}
SYSCTL_NODE(_sysctl, 2, next, CTLFLAG_RD | CTLFLAG_LOCKED, sysctl_sysctl_next, "");
STATIC int
name2oid (char *name, int *oid, u_int *len)
{
int i;
struct sysctl_oid *oidp;
struct sysctl_oid_list *lsp = &sysctl__children;
char *p;
if (!*name)
return ENOENT;
p = name + strlen(name) - 1 ;
if (*p == '.')
*p = '\0';
*len = 0;
for (p = name; *p && *p != '.'; p++)
;
i = *p;
if (i == '.')
*p = '\0';
oidp = SLIST_FIRST(lsp);
while (oidp && *len < CTL_MAXNAME) {
if (strcmp(name, oidp->oid_name)) {
oidp = SLIST_NEXT(oidp, oid_link);
continue;
}
*oid++ = oidp->oid_number;
(*len)++;
if (!i) {
return (0);
}
if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE)
break;
if (oidp->oid_handler)
break;
lsp = (struct sysctl_oid_list *)oidp->oid_arg1;
oidp = SLIST_FIRST(lsp);
*p = i;
name = p+1;
for (p = name; *p && *p != '.'; p++)
;
i = *p;
if (i == '.')
*p = '\0';
}
return ENOENT;
}
STATIC int
sysctl_sysctl_name2oid(__unused struct sysctl_oid *oidp, __unused void *arg1,
__unused int arg2, struct sysctl_req *req)
{
char *p;
int error, oid[CTL_MAXNAME];
u_int len = 0;
if (req->newlen < 1)
return ENOENT;
if (req->newlen >= MAXPATHLEN)
return (ENAMETOOLONG);
MALLOC(p, char *,req->newlen+1, M_TEMP, M_WAITOK);
if (!p)
return ENOMEM;
error = SYSCTL_IN(req, p, req->newlen);
if (error) {
FREE(p, M_TEMP);
return (error);
}
p [req->newlen] = '\0';
lck_rw_lock_shared(sysctl_geometry_lock);
error = name2oid(p, oid, &len);
lck_rw_done(sysctl_geometry_lock);
FREE(p, M_TEMP);
if (error)
return (error);
error = SYSCTL_OUT(req, oid, len * sizeof *oid);
return (error);
}
SYSCTL_PROC(_sysctl, 3, name2oid, CTLFLAG_RW|CTLFLAG_ANYBODY|CTLFLAG_KERN | CTLFLAG_LOCKED, 0, 0,
sysctl_sysctl_name2oid, "I", "");
STATIC int
sysctl_sysctl_oidfmt(__unused struct sysctl_oid *oidp, void *arg1, int arg2,
struct sysctl_req *req)
{
int *name = (int *) arg1;
int error = ENOENT;
u_int namelen = arg2;
u_int indx;
struct sysctl_oid *oid;
struct sysctl_oid_list *lsp = &sysctl__children;
lck_rw_lock_shared(sysctl_geometry_lock);
oid = SLIST_FIRST(lsp);
indx = 0;
while (oid && indx < CTL_MAXNAME) {
if (oid->oid_number == name[indx]) {
indx++;
if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
if (oid->oid_handler)
goto found;
if (indx == namelen)
goto found;
lsp = (struct sysctl_oid_list *)oid->oid_arg1;
oid = SLIST_FIRST(lsp);
} else {
if (indx != namelen) {
error = EISDIR;
goto err;
}
goto found;
}
} else {
oid = SLIST_NEXT(oid, oid_link);
}
}
goto err;
found:
if (!oid->oid_fmt)
goto err;
error = SYSCTL_OUT(req,
&oid->oid_kind, sizeof(oid->oid_kind));
if (!error)
error = SYSCTL_OUT(req, oid->oid_fmt,
strlen(oid->oid_fmt)+1);
err:
lck_rw_done(sysctl_geometry_lock);
return (error);
}
SYSCTL_NODE(_sysctl, 4, oidfmt, CTLFLAG_RD | CTLFLAG_LOCKED, sysctl_sysctl_oidfmt, "");
int
sysctl_handle_int(__unused struct sysctl_oid *oidp, void *arg1, int arg2,
struct sysctl_req *req)
{
return sysctl_io_number(req, arg1? *(int*)arg1: arg2, sizeof(int), arg1, NULL);
}
int
sysctl_handle_long(__unused struct sysctl_oid *oidp, void *arg1,
__unused int arg2, struct sysctl_req *req)
{
if (!arg1)
return (EINVAL);
return sysctl_io_number(req, *(long*)arg1, sizeof(long), arg1, NULL);
}
int
sysctl_handle_quad(__unused struct sysctl_oid *oidp, void *arg1,
__unused int arg2, struct sysctl_req *req)
{
if (!arg1)
return (EINVAL);
return sysctl_io_number(req, *(long long*)arg1, sizeof(long long), arg1, NULL);
}
int
sysctl_handle_int2quad(__unused struct sysctl_oid *oidp, void *arg1,
__unused int arg2, struct sysctl_req *req)
{
int error = 0;
long long val;
int newval;
if (!arg1)
return (EINVAL);
val = (long long)*(int *)arg1;
error = SYSCTL_OUT(req, &val, sizeof(long long));
if (error || !req->newptr)
return (error);
error = SYSCTL_IN(req, &val, sizeof(long long));
if (!error) {
newval = (int)val;
if ((long long)newval != val) {
error = ERANGE;
} else {
*(int *)arg1 = newval;
}
}
return (error);
}
int
sysctl_handle_string( __unused struct sysctl_oid *oidp, void *arg1, int arg2,
struct sysctl_req *req)
{
return sysctl_io_string(req, arg1, arg2, 0, NULL);
}
int
sysctl_handle_opaque(__unused struct sysctl_oid *oidp, void *arg1, int arg2,
struct sysctl_req *req)
{
return sysctl_io_opaque(req, arg1, arg2, NULL);
}
STATIC int
sysctl_old_kernel(struct sysctl_req *req, const void *p, size_t l)
{
size_t i = 0;
if (req->oldptr) {
i = l;
if (i > req->oldlen - req->oldidx)
i = req->oldlen - req->oldidx;
if (i > 0)
bcopy((const void*)p, CAST_DOWN(char *, (req->oldptr + req->oldidx)), i);
}
req->oldidx += l;
if (req->oldptr && i != l)
return (ENOMEM);
return (0);
}
STATIC int
sysctl_new_kernel(struct sysctl_req *req, void *p, size_t l)
{
if (!req->newptr)
return 0;
if (req->newlen - req->newidx < l)
return (EINVAL);
bcopy(CAST_DOWN(char *, (req->newptr + req->newidx)), p, l);
req->newidx += l;
return (0);
}
int
kernel_sysctl(struct proc *p, int *name, u_int namelen, void *old, size_t *oldlenp, void *new, size_t newlen)
{
int error = 0;
struct sysctl_req req;
bzero(&req, sizeof req);
req.p = p;
if (oldlenp)
req.oldlen = *oldlenp;
if (old)
req.oldptr = CAST_USER_ADDR_T(old);
if (newlen) {
req.newlen = newlen;
req.newptr = CAST_USER_ADDR_T(new);
}
req.oldfunc = sysctl_old_kernel;
req.newfunc = sysctl_new_kernel;
req.lock = 1;
error = sysctl_root(TRUE, FALSE, NULL, 0, name, namelen, &req);
if (error && error != ENOMEM)
return (error);
if (oldlenp)
*oldlenp = req.oldidx;
return (error);
}
STATIC int
sysctl_old_user(struct sysctl_req *req, const void *p, size_t l)
{
int error = 0;
size_t i = 0;
if (req->oldptr) {
if (req->oldlen - req->oldidx < l)
return (ENOMEM);
i = l;
if (i > req->oldlen - req->oldidx)
i = req->oldlen - req->oldidx;
if (i > 0)
error = copyout((const void*)p, (req->oldptr + req->oldidx), i);
}
req->oldidx += l;
if (error)
return (error);
if (req->oldptr && i < l)
return (ENOMEM);
return (0);
}
STATIC int
sysctl_new_user(struct sysctl_req *req, void *p, size_t l)
{
int error;
if (!req->newptr)
return 0;
if (req->newlen - req->newidx < l)
return (EINVAL);
error = copyin((req->newptr + req->newidx), p, l);
req->newidx += l;
return (error);
}
int
sysctl_root(boolean_t from_kernel, boolean_t string_is_canonical, char *namestring, size_t namestringlen, int *name, u_int namelen, struct sysctl_req *req)
{
u_int indx;
int i;
struct sysctl_oid *oid;
struct sysctl_oid_list *lsp = &sysctl__children;
int error;
boolean_t unlocked_node_found = FALSE;
boolean_t namestring_started = FALSE;
lck_rw_lock_shared(sysctl_geometry_lock);
if (string_is_canonical) {
error = name2oid(namestring, name, &namelen);
if (error) {
goto err;
}
}
oid = SLIST_FIRST(lsp);
indx = 0;
while (oid && indx < CTL_MAXNAME) {
if (oid->oid_number == name[indx]) {
if (!from_kernel && !string_is_canonical) {
if (namestring_started) {
if (strlcat(namestring, ".", namestringlen) >= namestringlen) {
error = ENAMETOOLONG;
goto err;
}
}
if (strlcat(namestring, oid->oid_name, namestringlen) >= namestringlen) {
error = ENAMETOOLONG;
goto err;
}
namestring_started = TRUE;
}
indx++;
if (!(oid->oid_kind & CTLFLAG_LOCKED))
{
unlocked_node_found = TRUE;
}
if (oid->oid_kind & CTLFLAG_NOLOCK)
req->lock = 0;
if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
if (oid->oid_handler)
goto found;
if (indx == namelen)
{
error = ENOENT;
goto err;
}
lsp = (struct sysctl_oid_list *)oid->oid_arg1;
oid = SLIST_FIRST(lsp);
} else {
if (indx != namelen)
{
error = EISDIR;
goto err;
}
goto found;
}
} else {
oid = SLIST_NEXT(oid, oid_link);
}
}
error = ENOENT;
goto err;
found:
if (!from_kernel && !string_is_canonical && (indx < namelen)) {
char tempbuf[10];
u_int indx2;
for (indx2 = indx; indx2 < namelen; indx2++) {
snprintf(tempbuf, sizeof(tempbuf), "%d",name[indx2]);
if (namestring_started) {
if (strlcat(namestring, ".", namestringlen) >= namestringlen) {
error = ENAMETOOLONG;
goto err;
}
}
if (strlcat(namestring, tempbuf, namestringlen) >= namestringlen) {
error = ENAMETOOLONG;
goto err;
}
namestring_started = TRUE;
}
}
if (req->newptr && (!(oid->oid_kind & CTLFLAG_WR) ||
((oid->oid_kind & CTLFLAG_SECURE) && securelevel > 0))) {
error = (EPERM);
goto err;
}
if (from_kernel && !(oid->oid_kind & CTLFLAG_KERN))
{
error = (EPERM);
goto err;
}
if (!(oid->oid_kind & CTLFLAG_ANYBODY) &&
req->newptr && req->p &&
(error = proc_suser(req->p)))
goto err;
if (!oid->oid_handler) {
error = EINVAL;
goto err;
}
OSAddAtomic(1, &oid->oid_refcnt);
lck_rw_done(sysctl_geometry_lock);
#if CONFIG_MACF
if (!from_kernel) {
error = mac_system_check_sysctlbyname(kauth_cred_get(),
namestring,
name,
namelen,
req->oldptr,
req->oldlen,
req->newptr,
req->newlen);
if (error)
goto dropref;
}
#endif
if (unlocked_node_found)
{
lck_mtx_lock(sysctl_unlocked_node_lock);
}
if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
i = (oid->oid_handler) (oid,
name + indx, namelen - indx,
req);
} else {
i = (oid->oid_handler) (oid,
oid->oid_arg1, oid->oid_arg2,
req);
}
error = i;
if (unlocked_node_found)
{
lck_mtx_unlock(sysctl_unlocked_node_lock);
}
#if CONFIG_MACF
dropref:
#endif
lck_rw_lock_shared(sysctl_geometry_lock);
if (OSAddAtomic(-1, &oid->oid_refcnt) == 1)
wakeup(&oid->oid_refcnt);
err:
lck_rw_done(sysctl_geometry_lock);
return (error);
}
void sysctl_create_user_req(struct sysctl_req *req, struct proc *p, user_addr_t oldp,
size_t oldlen, user_addr_t newp, size_t newlen)
{
bzero(req, sizeof(*req));
req->p = p;
req->oldlen = oldlen;
req->oldptr = oldp;
if (newlen) {
req->newlen = newlen;
req->newptr = newp;
}
req->oldfunc = sysctl_old_user;
req->newfunc = sysctl_new_user;
req->lock = 1;
return;
}
int
sysctl(proc_t p, struct sysctl_args *uap, __unused int32_t *retval)
{
int error;
size_t oldlen = 0, newlen;
int name[CTL_MAXNAME];
struct sysctl_req req;
char *namestring;
size_t namestringlen = MAXPATHLEN;
if (uap->namelen > CTL_MAXNAME || uap->namelen < 2)
return (EINVAL);
error = copyin(uap->name, &name[0], uap->namelen * sizeof(int));
if (error)
return (error);
AUDIT_ARG(ctlname, name, uap->namelen);
if (uap->newlen > SIZE_T_MAX)
return (EINVAL);
newlen = (size_t)uap->newlen;
if (uap->oldlenp != USER_ADDR_NULL) {
uint64_t oldlen64 = fuulong(uap->oldlenp);
if (oldlen64 > SIZE_T_MAX)
oldlen = SIZE_T_MAX;
else
oldlen = (size_t)oldlen64;
}
sysctl_create_user_req(&req, p, uap->old, oldlen, uap->new, newlen);
if (uap->namelen == 2) {
if (name[0] == CTL_KERN && name[1] < KERN_MAXID) {
namestringlen = 32;
} else if (name[0] == CTL_HW && name[1] < HW_MAXID) {
namestringlen = 32;
}
}
MALLOC(namestring, char *, namestringlen, M_TEMP, M_WAITOK);
if (!namestring) {
oldlen = 0;
goto err;
}
error = userland_sysctl(FALSE, namestring, namestringlen, name, uap->namelen, &req, &oldlen);
FREE(namestring, M_TEMP);
if ((error) && (error != ENOMEM))
return (error);
err:
if (uap->oldlenp != USER_ADDR_NULL)
error = suulong(uap->oldlenp, oldlen);
return (error);
}
int
sysctlbyname(proc_t p, struct sysctlbyname_args *uap, __unused int32_t *retval)
{
int error;
size_t oldlen = 0, newlen;
char *name;
size_t namelen = 0;
struct sysctl_req req;
int oid[CTL_MAXNAME];
if (uap->namelen >= MAXPATHLEN)
return (ENAMETOOLONG);
namelen = (size_t)uap->namelen;
MALLOC(name, char *, namelen+1, M_TEMP, M_WAITOK);
if (!name)
return ENOMEM;
error = copyin(uap->name, name, namelen);
if (error) {
FREE(name, M_TEMP);
return (error);
}
name[namelen] = '\0';
if (uap->newlen > SIZE_T_MAX) {
FREE(name, M_TEMP);
return (EINVAL);
}
newlen = (size_t)uap->newlen;
if (uap->oldlenp != USER_ADDR_NULL) {
uint64_t oldlen64 = fuulong(uap->oldlenp);
if (oldlen64 > SIZE_T_MAX)
oldlen = SIZE_T_MAX;
else
oldlen = (size_t)oldlen64;
}
sysctl_create_user_req(&req, p, uap->old, oldlen, uap->new, newlen);
error = userland_sysctl(TRUE, name, namelen+1, oid, CTL_MAXNAME, &req, &oldlen);
FREE(name, M_TEMP);
if ((error) && (error != ENOMEM))
return (error);
if (uap->oldlenp != USER_ADDR_NULL)
error = suulong(uap->oldlenp, oldlen);
return (error);
}
int
userland_sysctl(boolean_t string_is_canonical,
char *namestring, size_t namestringlen,
int *name, u_int namelen, struct sysctl_req *req,
size_t *retval)
{
int error = 0;
struct sysctl_req req2;
do {
req2 = *req;
if (!string_is_canonical)
namestring[0] = '\0';
error = sysctl_root(FALSE, string_is_canonical, namestring, namestringlen, name, namelen, &req2);
} while (error == EAGAIN);
if (error && error != ENOMEM)
return (error);
if (retval) {
if (req2.oldptr && req2.oldidx > req2.oldlen)
*retval = req2.oldlen;
else
*retval = req2.oldidx;
}
return (error);
}
int
kernel_sysctlbyname(const char *name, void *oldp, size_t *oldlenp, void *newp, size_t newlen)
{
int oid[CTL_MAXNAME];
int name2mib_oid[2];
int error;
size_t oidlen;
name2mib_oid[0] = 0;
name2mib_oid[1] = 3;
oidlen = sizeof(oid);
error = kernel_sysctl(current_proc(), name2mib_oid, 2, oid, &oidlen, __DECONST(void *, name), strlen(name));
oidlen /= sizeof(int);
if (error == 0)
error = kernel_sysctl(current_proc(), oid, oidlen, oldp, oldlenp, newp, newlen);
return(error);
}