static int do_sysctl_op(int fd, struct sysctl_req *req, int op)
{
int ret = -1, nr = 1;
switch (CTL_TYPE(req->type)) {
case __CTL_U32A:
nr = CTL_LEN(req->type);
/* fallthrough */
case CTL_U32:
__SYSCTL_OP(ret, fd, req, u32, nr, op);
break;
case CTL_32:
__SYSCTL_OP(ret, fd, req, s32, nr, op);
break;
case __CTL_U64A:
nr = CTL_LEN(req->type);
/* fallthrough */
case CTL_U64:
__SYSCTL_OP(ret, fd, req, u64, nr, op);
break;
case __CTL_STR:
nr = CTL_LEN(req->type);
__SYSCTL_OP(ret, fd, req, char, nr, op);
break;
}
return ret;
}
static int __sysctl_op(int dir, struct sysctl_req *req, int op)
{
int fd = -1;
int ret = -1;
int nr = 1;
if (dir >= 0) {
int flags;
if (op == CTL_READ)
flags = O_RDONLY;
else
flags = O_WRONLY;
fd = openat(dir, req->name, flags);
if (fd < 0) {
pr_perror("Can't open sysctl %s", req->name);
return -1;
}
}
switch (CTL_TYPE(req->type)) {
case __CTL_U32A:
nr = CTL_LEN(req->type);
case CTL_U32:
__SYSCTL_OP(ret, fd, req, u32, nr, op);
break;
case __CTL_U64A:
nr = CTL_LEN(req->type);
case CTL_U64:
__SYSCTL_OP(ret, fd, req, u64, nr, op);
break;
case __CTL_STR:
nr = CTL_LEN(req->type);
__SYSCTL_OP(ret, fd, req, char, nr, op);
break;
}
close_safe(&fd);
return ret;
}
static int sysctl_userns_arg_size(int type)
{
switch(CTL_TYPE(type)) {
case __CTL_U32A:
return sizeof(u32) * CTL_LEN(type);
case CTL_U32:
return sizeof(u32);
case CTL_32:
return sizeof(s32);
case __CTL_U64A:
return sizeof(u64) * CTL_LEN(type);
case CTL_U64:
return sizeof(u64);
case __CTL_STR:
return sizeof(char) * CTL_LEN(type) + 1;
default:
pr_err("unknown arg type %d\n", type);
/* Ensure overflow to cause an error */
return MAX_UNSFD_MSG_SIZE;
}
}